Food safety through natural antimicrobials

antibiotics Review Food Safety through Natural Antimicrobials Emiliano J. Quinto 1,* , Irma Caro 1, Luz H. Villalobos-Delgado 2, Javier Mateo 3, Beatriz De-Mateo-Silleras 1and María P. Redondo-Del-Río1 1 Department of Nutrition and Food Science, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain; [email protected] (I.C.); [email protected] (B.D.-M.-S.); [email protected] (M.P.R.-D.-R.) 2Institute of Agroindustry, Technological University of the Mixteca, Huajuapan de León, Oaxaca 69000, Mexico; [email protected] 3Department of Hygiene and Food Technology, Faculty of Veterinary Medicine, University of León, 24071 León, Spain; [email protected] *Correspondence: [email protected] Received: 24 September 2019; Accepted: 24 October 2019; Published: 31 October 2019   Abstract: Microbial pathogens are the cause of many foodborne diseases after the ingestion of contaminated food. Several preservation methods have been developed to assure microbial food safety, as well as nutritional values and sensory characteristics of food. However, the demand for natural antimicrobial agents is increasing due to consumers’ concern on health issues. Moreover, the use of antibiotics is leading to multidrug resistant microorganisms reinforcing the focus of researchers and the food industry on natural antimicrobials. Natural antimicrobial compounds from plants, animals, bacteria, viruses, algae and mushrooms are covered. Finally, new perspectives from researchers in the field and the interest of the food industry in innovations are reviewed. These new approaches should be useful for controlling foodborne bacterial pathogens; furthermore, the shelf-life of food would be extended. Keywords: natural antimicrobials; preservation; plants; spices; bacteria; viruses; algae; mushrooms; bacteriocins; bacteriophages 1. Introduction Microbial pathogens are the cause of many foodborne diseases after the ingestion of contaminated food. Several preservation methods have been developed to assure microbial food safety, as well as nutritional values and sensory characteristics of food. Those methods sometimes have undesired effects on the nutritional and/or organoleptic aspects of food; synthetic preservatives are well known for causing health problems such as allergic reactions: nitrates, benzoates, sulfites, sorbates, formaldehyde, and phenolic antioxidants are good examples [ 1 , 2 ]. The use of natural antimicrobial food preservatives—biopreservation—could ensure the safety and quality of food being an alternative to other systems of preservation such as chemical or thermal ones. An excellent overview of natural antimicrobials applications can be seen in [ 1 ]. Biopreservation uses natural preservatives against a high number of pathogenic microorganisms related to food; those preservatives are obtained from animals, plants, bacteria, as well as mushrooms, algae, and viruses [ 2 ]. Figure 1shows a general view of natural antimicrobials and their different roles in food safety. Antibiotics 2019,8, 208; doi:10.3390/antibiotics8040208 www.mdpi.com/journal/antibiotics Antibiotics 2019,8, 208 2 of 30 Antibiotics 2019, 8, x 2 of 29 inadequate use of antibiotics leading to multidrug-resistant microorganisms also justify and reinforce the focus on natural antimicrobials [2]. Natural antimicrobials ensure food safety from a new perspective increasing its shelf-life; furthermore, their direct incorporation to different foods from different origins such as meat or vegetables as well as to their packaging give, as a result, the extension of their shelf-life [1,5]. They also constitute a viable alternative to microbial resistance caused by antibiotics. Recent studies comparing natural derivatives from plants with synthetic antimicrobials have shown that natural substances could be safer [3,6,7]. The mechanisms of action of natural antimicrobials include the rupture of the cell membrane, affect the nucleic acids mechanisms, the decay of the proton motive force, and depletion of adenosine triphosphate (ATP). Antimicrobials from plants (polyphenols, essential oils), animals (lysozyme, lactoperoxidase, lactoferrin), metabolites from microorganisms, or extracts from algae use those mechanisms of action against foodborne bacteria [1,8]. Figure 1. Overview of natural antimicrobials and their role in food safety. 2. Natural Antimicrobials from Plants Herbs and spices have most of the antimicrobials derived from plants [9–11]. These compounds have different structural configurations, having different antimicrobial actions against foodborne pathogens [12]. A fine review showing the different structural variations of plant-derived components and their effect on their antimicrobial capacities was published by Gyawali and Ibrahim [2]. The structural configuration of these compounds has big impact on their antimicrobial action, i.e. the hydroxyl (−OH) groups are thought to be the cause; the reason behind that fact is the interaction of the hydroxyl groups with the bacterial cell membrane disrupting its structures and causing leakage of its components. Growing interest in using antimicrobial plant-derived extracts is caused by the need to reduce the use of synthetic additives in food [13]. Antioxidant capacity usually joins the antimicrobial characteristics of these natural products; both properties together in one molecule makes the compound even more effective [1]. Plants and herbs (oregano, garlic, parsley, sage, coriander, Figure 1. Overview of natural antimicrobials and their role in food safety. The demand for natural antimicrobial agents is expected to increase steadily for replacing synthetic compounds [ 3 ]. A novel trend is arising from health-conscious consumers expecting that natural antimicrobials act only against foodborne pathogens leaving the consumers’ microbiome out of their scope [ 1 ]. The negative effect of some synthetic preservatives on consumers’ health is leading to more research to evaluate that natural antimicrobials fulfil food safety regulations [ 4 ]; the inadequate use of antibiotics leading to multidrug-resistant microorganisms also justify and reinforce the focus on natural antimicrobials [ 2 ]. Natural antimicrobials ensure food safety from a new perspective increasing its shelf-life; furthermore, their direct incorporation to different foods from different origins such as meat or vegetables as well as to their packaging give, as a result, the extension of their shelf-life [ 1 , 5 ]. They also constitute a viable alternative to microbial resistance caused by antibiotics. Recent studies comparing natural derivatives from plants with synthetic antimicrobials have shown that natural substances could be safer [ 3 , 6 , 7 ]. The mechanisms of action of natural antimicrobials include the rupture of the cell membrane, affect the nucleic acids mechanisms, the decay of the proton motive force, and depletion of adenosine triphosphate (ATP). Antimicrobials from plants (polyphenols, essential oils), animals (lysozyme, lactoperoxidase, lactoferrin), metabolites from microorganisms, or extracts from algae use those mechanisms of action against foodborne bacteria [1,8]. 2. Natural Antimicrobials from Plants Herbs and spices have most of the antimicrobials derived from plants [ 9 – 11 ]. These compounds have different structural configurations, having different antimicrobial actions against foodborne pathogens [ 12 ]. A fine review showing the different structural variations of plant-derived components and their effect on their antimicrobial capacities was published by Gyawali and Ibrahim [ 2 ]. The structural configuration of these compounds has big impact on their antimicrobial action, i.e. the hydroxyl ( − OH) groups are thought to be the cause; the reason behind that fact is the interaction of the Antibiotics 2019,8, 208 3 of 30 hydroxyl groups with the bacterial cell membrane disrupting its structures and causing leakage of its components. Growing interest in using antimicrobial plant-derived extracts is caused by the need to reduce the use of synthetic additives in food [ 13 ]. Antioxidant capacity usually joins the antimicrobial characteristics of these natural products; both properties together in one molecule makes the compound even more effective [ 1 ]. Plants and herbs (oregano, garlic, parsley, sage, coriander, rosemary, and lemongrass), spices (cinnamon, clove), oils (citral) or organic compounds (vanillin) have been used alone for their antimicrobial and antioxidant properties or in combination with other techniques for food preservation [ 14 – 16 ]. These authors also reported lower activity from products such as ginger, pepper, cumin, chilli, and curry. Gutierrez et al. [ 14 ] assessed combinations of essential oils from thyme, sage, rosemary, oregano, lemon, and basil against different microorganisms: Bacillus cereus, Escherichia coli,Listeria monocytogenes and Pseudomonas aeruginosa. Oregano showed efficacy against B. cereus; furthermore, the oregano combinations with basil or thyme were active against B. cereus, E. coli and P. aeruginosa. These authors also studied the effect of the pH and different ingredients from foods on the activity of thyme and oregano against L. monocytogenes; the kinetic parameters of the microorganism were more affected in foods with acidic pH and a high content in proteins. Proestos et al. [ 15 ] studied extracts from five plants—meadowsweet, hawthorn, polygonum, silverweed, and little robin—showing their antioxidant capacity, with total phenolic contents between 7.2–28.2 gallic acid equivalents/mg or mL; their activity against the microorganisms showed that Gram-negative bacteria were less sensitive than Gram-positive. Numerous studies have been carried out using natural compounds extracted from plants against several microbial genera and/or species. Nanasombat and Lohasupthawee [ 17 ] studied the antimicrobial activity of extracts and essential oils from 14 spices tested against 20 serotypes of Salmonella and other members of the Enterobacteriaceae family, founding the following trend from greater to lesser degree of antimicrobial activity: Clove, cardamom, coriander, nutmeg, ginger, garlic, and basil among others. E. coli was the non-salmonellae strain more susceptible to most of the spice oils. 2.1. Onions and Garlic The growth of many microorganisms is inhibited by onion and garlic. Several authors reported on the antimicrobial capacities of onions and garlic a long time ago [ 18 – 24 ]. Juices and vapours of these plants inhibit the growth of several microorganisms including bacteria (Bacillus cereus,Clostridium botulinum,Escherichia coli,Lactobacillus,Salmonella,Staphylococcus aureus, etc.) and fungi (Aspergillus spp., Candida,Saccharomyces, etc.) [ 23 ]. Conner et al. [ 18 ] reported that essential oils of onion (500 µ g/mL) reduced the ethanol production by Sacchraromyces cerevisiae, suppressed the production of ethanol by Hansenula anomala, and delayed sporulation of Lodderomyces elongisporus. Gonz á lez-Fandos et al. [ 19 ] studied the inhibition of S. aureus growth and enterotoxin and thermonuclease production by garlic in brain heart infusion (BHI) broth. These authors found that S. aureus was inhibited at levels of 1.5% and over; enterotoxins A, B, and C1 were found with less than 1% of garlic, but at a 2% concentration the enterotoxin D was synthesized. Garlic inhibited thermonuclease production completely at levels greater or equal to 1.5%. Barone et al. [ 22 ] reported fungicidal activity of garlic extracts (68 µ g/mL) against 39 of 41 clinical strains of Candida albicans in standing culture; the extract was fungistatic (50–300 µ g/mL) and fungicidal (>400 µ g/mL) in shake culture. A very interesting fact found by Barone et al. [ 22 ] was a loss of antimicrobial activity against C. albicans when the garlic extract was heat treated at 37 ◦ C, having food safety implications in culinary processes; moreover, the activity against the microorganism was stable under acidic conditions, but unstable under base conditions. Kim et al. [ 24 ] studied the activity of garlic and onion essential oils and their sulfides against several bacteria and yeasts: S. aureus, E. coli,Enterobacter aerogenes,Leuconostoc mesenteroides,Pediococcus pentosaceus,Lactobacillus plantarum, Pichia membranefaciens,Saccharomyces cerevisiae,Candida utilis,Candida albicans,Zygosaccharomyces bisporus, and Zygosaccharomyces rouxii. The minimum inhibitory concentrations (MIC) of garlic and onion oils, diallyl-trisulfide and -tetrasulfide, and dimethyl-trisulfide were 2–45 ppm for the yeasts Antibiotics 2019,8, 208 4 of 30 studied; however, these compounds had weak activity against most of the bacteria (MIC >300 ppm). The activity against the tested yeasts was not influenced by the storage or the pH. 2.2. Spices As stated by Taylor and Davidson [ 23 ], spices are different parts (roots, seeds, leaves, fruits, etc.) of aromatic plants added as flavouring components to foods; among them, oregano, cinnamon, clove, and rosemary showed the greatest activity against microorganisms. Eugenol and cinnamic aldehyde are the major constituents of clove and cinnamon, respectively [ 23 ]. Cinnamon and cinnamic aldehyde have shown activity against bacteria (Aeromonas hydrophila,Bacillus spp., Campylobacter jejuni, verotoxin-producing E. coli,Lactobacillus,Listeria monocytogenes,Salmonella,Shigella,S. aureus, and Streptococcus) and fungi (Aspergillus,Candida,Penicillium, and Saccharomyces) [ 23 , 25 – 31 ]. Clove and eugenol are inhibitory to similar bacteria and fungi [ 28 – 39 ]. The antimicrobial effects of cinnamon alone or combined with potassium sorbate or sodium benzoate were tested against Escherichia coli O157:H7 at different temperatures in apple juice by Ceylan et al. [ 25 ]; the microorganism counts were reduced by approximately 2.0 log colony forming units (CFU)/mL at 8 or 25 ◦ C by 0.3% cinnamon. Between cinnamon and the studied preservatives a synergistic activity was found: 0.3% of cinnamon combined with 0.1% of sodium benzoate or potassium sorbate killed 5 log CFU/mL in 11 or 14 d at 8 ◦ C, respectively; the inhibitory effect was similar in 3 d by the same combinations at 25 ◦ C. Thyme, oregano, dictamus, marjoram, lavender, rosemary, and sage were tested against Penicillium digitatum by Daferera et al. [ 26 ]; the growth and germination were inhibited by the essential oils of dictamus, marjoram, oregano, and thyme at 250–400 µ g/mL, while lavender, rosemary, and sage were less effective. Friedman et al. [ 28 ] studied the activity of 119 essential oils against bacteria isolated from foods and clinical sources (Campylobacter jejuni,E. coli O157:H7, L. monocytogenes, and Salmonella enterica) founding that 39 oils were active against all four species of bacteria. Nielsen et al. [ 30 ] investigated the effect of spices and herbs oils and oleoresins against bread spoilage fungi (Penicillium commune, P. roqueforti,Aspergillus flavus, and Endomyces fibuliger) as an alternative to modified atmosphere packaging. Cinnamon, clove, garlic, and mustard had high activity, while oregano had weak activity against the growth of fungi; the more resistant microorganisms was A. flavus, and P. roqueforti the most sensitive. The activities against the microorganisms of oregano and thyme have been assigned to carvacrol and thymol, respectively [ 23 ], showing activity against the bacteria Aeromonas spp., B. cereus,Brochothrix thermosphacta,Campylobacter jejuni,Escherichia coli,Enterobacter faecalis,Lactobacillus plantarum,Listeria monocytogenes,Pediococcus cerevisiae,Pseudomonas,Proteus,Salmonella,Shigella,Staphylococcus aureus, Vibrio parahaemolyticus, and Yersinia enterocolitica [ 7 , 34 , 40 – 51 ], and the moulds and yeasts Aspergillus, Candida,Geotrichum,Penicillium,Pichia,Rhodotorula,Saccharomyces cerevisiae, and Schizosaccharomyces pombe [ 52 – 59 ]. Burt and Reinders [ 7 ] quantified the antibacterial effect against E. coli O157:H7 of several essential oils with or without a stabilizer (such as agar) and an emulsifier (lecithin) at different temperatures. Oregano and thyme essential oils had the strongest properties; 0.05% of agar reinforced the activity of the essential oils at 10 ◦ C, whereas the addition of 0.25% of lecithin reduced their activity. These authors reported that the combination of oregano or thyme with agar reduces the number of E. coli O157:H7 preventing its growth. Of 17 spices and herbs tested at 0.5–1%, only clove, basil, marjoram, oregano, rosemary, and thyme showed activity against Shigella spp. [ 34 ]. These authors combined temperature (12, 22, and 37 ◦ C), pH (5.0, 5.5, and 6.0), NaCl (1–4%), and thyme or basil (0 or 1%), establishing that both can contribute as an inhibitory factor: S. flexneri did not grow for 7 d with basil and/or thyme, while growth was noted without them. The practical side of the study was the use of these spices in spaghetti sauce founding that, at 12 ◦ C, the population of S. sonnei decreased after 16 d; the population did not reduce its counts at 4 ◦ C. Seaberg et al. [ 41 ] addressed the fact that different batches of the same plant species have a genetic heterogeneity that represents a problem for their use against microbial growth and for achieving the “clean label” for the food industry. To overcome the situation, a clonal line of oregano was isolated, and its ethanol extracts together with Antibiotics 2019,8, 208 5 of 30 its main constituents—thymol and carvacrol—were used in both broth and meat systems to study its activity against Listeria monocytogenes; all thymol and carvacrol (150–200 ppm) and the clonal line (1200 ppm) inhibited the L. monocytogenes growth in both systems. Singh et al. [ 42 ] also evaluated the activity of essential oils from different plants against Listeria monocytogenes in peptone water and hotdogs, finding that thyme and clove (1 mL/L) were highly effective inhibiting the population of L. monocytogenes below detection limits. Carvacrol was also investigated by Ultee et al. [ 43 ] for its effect on Bacillus cereus and the production of diarrheal toxin; its counts were reduced with concentrations of about 0–0.06 mg/mL in BHI broth—an 80% decline in toxin production was detected with 0.06 mg/mL. Carvacrol, thymol, cymene, and terpinene were studied against E. coli O157:H7 by Burt et al. [ 45 ] and Kisk ó and Roller [ 47 ]; carvacrol and thymol were additive in combination showing bacteriostatic and bactericidal activities (1.2 mmol/L), and cymene and terpinene did not show antibacterial activity up to 50 mmol/L. The inhibitory activity of several natural compounds (thymol, carvacrol, eugenol, cinnamic acid, and diacetyl) alone or in combination with nisin against E. coli and Salmonella enterica serovar Typhimurium [ 48 ], or Bacillus subtilis and Listeria innocua [ 49 ] was studied. Nisin alone showed no antibacterial activity. Thymol was the most effective with concentrations of 1.0–1.2 mmol against S. enterica and E. coli; the combination of nisin showed no improvement of the antimicrobial activity. All the organic compounds exhibited activity against the Gram-positive microorganisms with concentrations between 0.8 and 15.0 mM; the interaction between the organic compounds and nisin showed different patterns, varying from synergistic (carvacrol, eugenol, or thymol; nisin plus cinnamic acid only against L. innocua) to antagonistic (nisin plus diacetyl). The anticandidal activity of the major phenolic compounds of oregano (carvacrol at 0.1%) and clove (eugenol at 0.2%) essential oils was studied by Chami et al. [ 53 ]. Both compounds were fungicidal in exponentially growing Candida albicans. Also using Candida albicans, the activity of origanum, carvacrol, nystatin, and amphotericin B were tested by Manohar et al. [ 57 ]. C. albicans growth was completely inhibited by origanum oil at 0.25 mg/mL; origanum oil and carvacrol inhibited both germination and mycelial growth in a dose-dependent manner. Sage (containing thujone) and rosemary (with borneol, pinene, camphene, and camphor) also have antimicrobial activity [ 23 , 44 ]. Oregano, thyme and savoury [ 7 ], and sage and rosemary [ 60 , 61 ] essential oils showed pronounced bactericidal properties against E. coli O157:H7 and other foodborne pathogens. Pirbalouti et al. [ 62 ] reported antibacterial activity against L. monocytogenes by several plant extracts including essential oils from Thymus spp. In contrast, other authors [ 42 , 54 , 59 , 63 ] have found that essential oil of spices had little antimicrobial activity against bacteria and yeasts may be due to the assays utilized [23]. Several other spice essential oils have shown potential for antibacterial and antifungal activity. Sweet basil demonstrated activity against fungi such as Mucor and Penicillium although little activity against bacteria [ 23 , 64 ]; the main agents are linalool and methyl chavicol [ 23 ]. Essential oils from different varieties of sweet basil were tested for their activity against Gram-positive and Gram-negative foodborne bacteria, yeasts, and moulds by Lachowicz et al. [ 64 ]; all basil’s essential oils showed activity against the microorganisms tested with the exception of Flavimonas oryzihabitans and Pseudomonas spp. Vanilla beans have vanillin as their major constituent, being most active against moulds and Gram-positive bacteria [ 23 , 65 ]. Delaquis et al. [ 65 ] studied the activity of vanillin and vanillic acid against Listeria monocytogenes,L. innocua,L. grayi, and L. seeligeri. All strains were inhibited by concentrations of about 23–33 mM; concentrations of about 100 mM vanillic acid at pH >6.0 was not effective against the microorganisms, but with 10 mM at pH 5.0 the inhibition was complete. A declining pH increased the lethal activity of vanillic acid, and vanillin plus vanillic acid gave additive inhibitory effects. Other essential oils from spices have potential antimicrobial activity as well as antifungal, such as cilantro-also known as coriander, fingerroot, lemongrass, savory, and tea tree oil [ 23 , 28 , 44 , 58 , 61 , 66 – 70 ]. Antibiotics 2019,8, 208 6 of 30 2.3. Cruciferae Cabbage, cauliflower, broccoli, Brussels sprouts, horseradish, kale, kohlrabi, mustard, turnips, and rutabaga are members of this family. Isothiocyanates are reported as antimicrobial agents [ 23 ] against bacteria (E. coli O157:H7, L. monocytogenes,Salmonella,S. aureus,Serratia,Lactobacillus sake,Pseudomonas, and Enterobacteriaceae) [ 71 – 73 ] and fungi and yeast (Penicillium expansum,Aspergillus flavus, and Botrytis cinereal) [74]. Delaquis et al. [ 71 ] and Ward et al. [ 72 ] tested the behaviour of bacteria in pre-cooked roast beef with vaporized horseradish essential oil at 4 ◦ C for 28 d. Pseudomonas spp. and some members of the family Enterobacteriaceae were inhibited; lactic acid bacteria were more resistant. Interestingly, the colour of the cooked meat was preserved in samples stored with horseradish essential oil. The growth of S. aureus,E. coli O157:H7, S. typhimurium,L. monocytogenes, and Serratia grimesii was inhibited at 12 ◦C for 7 d of storage under aerobic conditions. 2.4. Phenolic Compounds Monophenols, diphenols, and triphenols are simple phenolic compounds. The use of wood smoke for food preservation implies the use of simple phenols (cresol, hydroquinone, gallic acid); additionally, their use gives a desirable flavour [ 23 ]. Liquid smoke is a method widely used in cheese surface inhibiting the growth of fungi such as Aspergillus oryzae,Penicillium camemberti, and Penicillium roqueforti [ 75 ]; these authors found that only isoeugenol inhibited all these molds. Cresol (forms mand p-) slightly inhibited the growth of P. camemberti, and guaiacol, 4-methylguaiacol, and mand p-cresol inhibited the growth of A. oryzae. The phenolic acids are present in plants and can inhibit bacteria such as Aeromonas hydrophila,E. coli,E. faecalis,Salmonella serovar Enteritidis, L. monocytogenes, and S. aureus, [ 23 , 76 ]. The most effective compound was the phenolic antioxidant tertiary butylhydroquinone with MIC of 64 µg/mL [76]. Hydroxycinnamic acids (such as caffeic, coumaric, ferulic, and sinapic acids) have different inhibition effects against B. cereus and S. aureus;P. fluorescens and E. coli are more resistant to them [ 23 , 77 ]. It has been reported the antifungal properties of hydroxycinnamic acids, i.e., inhibiting the production of aflatoxins from A. flavus and A. parasiticus [ 23 , 78 ]. Herald and Davidson [ 77 ] reported the antibacterial activity of caffeic, ferulic, and p-coumaric acids against Escherichia coli, Staphylococcus aureus, and Bacillus cereus; p-coumaric acid was the most effective against E. coli with concentrations of about 1000 µ g/mL at pH 5.0 for 48 h, and S. aureus and B. cereus with concentrations of about 500 µ g/mL at pH 5.0 for 48 h or at pH 7.0 for 9 h, respectively. Inhibition increased as pH decreased with E. coli and S. aureus but not B. cereus. Chipley and Uraih [ 78 ] studied the antimicrobial activity of o-nitrobenzoate, p-aminobenzoate, ethyl aminobenzoate, ethyland methyl-benzoate, salicylic acid, trans-cinnamic acid, trans-cinnamaldehyde, ferulic acid, o-acetoxy benzoic acid, and anthranilic acid on Aspergillus flavus and A. parasiticus growth and aflatoxin production at 27 ◦ C. Both methyland ethyl-benzoate were the most effective at concentrations of about 2.5–5.0 mg/25 mL of medium reducing the mycelial growth and the aflatoxin production. Furocoumarins are present in carrots, celery, citrus fruits, parsley, and parsnips. Several authors reported their antimicrobial activity against E. coli O157:H7, Erwinia carotovora,L. monocytogenes, and Micrococcus luteus [ 23 , 79 ]. The antimicrobial activity of furanocoumarins against L. monocytogenes, E. coli O157:H7, and Micrococcus luteus was investigated in a model food system (25% commercial vegetable baby food in peptone water) by Ulate-Rodr í guez et al. [ 79 ]. The growth of L. monocytogenes was inhibited with lime peel extract and cold-pressed lime oil, but not the growth of E. coli O157:H7; M. luteus counts were inhibited only by the cold-pressed lime oil. The minimum inhibitory and the minimum bactericidal concentrations of L. monocytogenes were 32 or 43 µg/g, respectively. Flavonoids, such as catechins, flavons, flavonols, and their glycosides, are present in apples, barley, grapes, plums, sorghum, and strawberries [ 23 , 80 ]. Cushnie and Lamb [ 80 ] reported antifungal, antiviral, and antibacterial activity. Quercetin activity was attributed to the inhibition of the enzyme DNA gyrase; the inhibition of the cell membrane functions by the activity of sophoraflavone G and Antibiotics 2019,8, 208 7 of 30 (-)-epigallocatechin gallate was reported and, moreover, the inhibition of the energy metabolism by the licochalcones A and C [ 80 ]. Other studied flavonoids are 2,4,2 0 -trihydroxy-5 0 -methyl chalcone, apigenin, galangin, lonchocarpol A, myricetin, robinetin, and rutin. 2.5. Hops The hop (Humulus lupulus L.) flower’s resin is used in the brewing industry for the bitter flavour it gives to beer [ 23 ]. Hop contains compounds (prenylated acylphloroglucinols and xanthohumol) that have inhibited bacteria growth, mostly Gram-positive [ 81 – 87 ]. The use of bitter acids as antimicrobials was approved by the Food Safety and Inspection Service (FSIS), USA [ 88 ]. Kramer et al. [ 81 ] studied the effect of hop extracts against some pathogens related with food using in vitro and meat model applications at 2 and 8 ◦ C. The MIC of hop extracts with bitter acids ( α - and β -acids) or xanthohumol were tested against E. coli,S. aureus,S. enterica, and L. monocytogenes. The xanthohumol and the β -acid inhibited the growth of the Gram-positive bacteria (MICs of 12.5 and 6.3 ppm, respectively), and the α -acid was less active (MIC of 200 ppm); in contrast, the Gram-negative bacteria were highly resistant. These authors concluded that “hop extracts could be used as natural preservatives in food applications to extend the shelf life and to increase the safety of fresh products.” Bogdanova et al. [ 82 ] investigated the antibiofilm properties of hop compounds (humulone, lupulone, and xanthohumol) against Staphylococcus spp., including strains that were methicillin-susceptible and resistant. All compounds showed antimicrobial activity against all strains; lupulone, followed by xanthohumol had the strongest effect. Lupulone and xanthohumol penetrated the biofilm reducing the number of cells or reducing completely their number at the higher concentrations (lupulone: 125 µ g/mL; xanthohumol: 60 µ g/mL). Hop extracts showed different grades of inhibition against L. monocytogenes in food [ 86 ]: In coleslaw, 1 mg/g of hop extract increased the inactivation; in milk, 0.1–1 mg/mL was inhibitory; and in cottage cheese, hop extract was bactericidal at 0.1–3 g/kg. These authors concluded that, overall, the activity against L. monocytogenes in food was enhanced with acidity and lower fat content. Some fungi are inhibited by hop acids [ 89 , 90 ] as well as protozoa [ 91 ]. Mizobuchi et al. [ 89 ] isolated a new flavonone (6-isopentenylnaringenin) from hard resins of hops; it was tested together with xanthohumol and isoxanthohumol showing antifungal activities against Candida albicans,Fusarium oxysporum,Trichophyton mentagrophytes and T. rubrum, and Mucor rouxianus. Srinivasan et al. [ 91 ] studied the antimicrobial spectrum of hop acid components for antiprotozoal activity, founding that ciliated protozoa were more sensitive than amoebae; plasmodia were sensitive but at a lower level than to the anti-malarial drugs. Xanthohumol was particularly potent, and the effect was enhanced by carbon dioxide. 2.6. Other Plants Ahn et al. [ 92 ] focused their studies on the extracts from grape seed and pine bark; these authors found that their extracts can be used against E. coli O157:H7, S. enterica serovar Typhimurium, and L. monocytogenes in vitro and ground beef. The populations of E. coli O157:H7, S. enterica serovar Typhimurium, and L. monocytogenes decreased below 10 CFU/mL after 16 h. Markin et al. [ 93 ] studied olive leaves extracts founding deadly effects on bacteria, dermatophytes, and yeast. Olive leaf 0.6% extract killed within 3 h almost all cells from cultures of E. coli,B. subtilis,Klebsiella pneumoniae, Pseudomonas aeruginosa, and S. aureus; 1.25% after 3 d inhibited the growth of dermatophytes such as Microsporum canis,Trichophyton mentagrophytes and T. rubrum, whereas 15% of plant extract killed after 24 h of incubation all the cells from the yeast Candida albicans. Dogasaki et al. [ 94 ] and Ibrahim et al. [ 95 ] mentioned the antibacterial properties of coffee and its compounds such as caffeic acid, chlorogenic acid, and protocatechuic acid; these compounds inhibited the growth of Legionella pneumophila and E. coli O157:H7, respectively. Furthermore, tea (Camellia sinensis) was also demonstrated to feature antimicrobial properties [ 96 – 98 ] through its predominant catechin, epigallocatechin gallate, against methicillin-resistant S. aureus. Shan et al. [ 99 ] reported the activity of cinnamon stick extracts (Cinnamomum burmanii Blume) against B. cereus,E. coli,L. monocytogenes,S. aureus, and Salmonella Antibiotics 2019,8, 208 8 of 30 anatum. Major compounds in the cinnamon stick were identified: E-cinnamaldehyde and polyphenols; both components significantly contributed to the antimicrobial properties. 2.7. Plant By-Products Large amounts of by-products are generated during the food processing of plants, such as fruit pomace, husks, kernels, peels, pulps, seeds, and unused flesh [ 2 ]. Usually considered as a waste, these by-products possess bioactive compounds with antimicrobial activity being promising sources for their commercial exploitation; Gyawali and Ibrahim [ 2 ] list some plant by-products as antimicrobials. Extracts of grape pomane [ 100 ] and olive pomace [ 101 , 102 ] have shown to be able to inhibit the growth of E. coli,Enterobacter spp., S. aureus,Salmonella spp., and L. monocytogenes, and other spoilage and pathogenic bacteria. Sagdic et al. [ 100 ] incorporated grape pomace extracts into beef patties at different concentrations: 1–10% for 12, 24 and 48 h. All the microorganisms tested (Enterobacteriaceae and spoilage microorganisms) were inhibited at a concentration of 10% in all the storage periods. Friedman et al. [ 101 ] evaluated the bactericidal activity of 10 food-based powders against E. coli O157:H7, S. enterica,S. aureus, and L. monocytogenes. Olive pomace, juice powder, and leaves were active against all bacteria. All powders had strong activity against S. aureus. Fruit peels are also important. Pomegranate fruit peels extracts showed their antimicrobial activity enhancing the shelf-life of chicken products [ 103 ], and their ability to inhibit the growth of E. coli, B. cereus, L. monocytogenes, S. aureus, and Y. enterocolitica [ 104 – 106 ]. Pomegranate peel showed good activity against S. aureus and B. cereus (MIC of 0.01%); concentrations of 0.1% inhibited Pseudomonas but E. coli and S. typhimurium. The shelf life of chicken products was enhanced by 2–3 weeks with the addition of pomegranate peel during chilled storage [ 103 ]. Li et al. [ 105 ] investigated the activity of the tannin-rich fraction from pomegranate rind against L. monocytogenes; punicalagin and ellagic acid were detected, and the MICs against L. monocytogenes strains were 1.25–5.0 mg/mL. The same research group [ 106 ] evaluated the effects of the same fraction on both the virulence gene expression and the L. monocytogenes interaction with the epithelial cells. The adhesion to and the invasion of Caco-2 cells were reduced at 2.5 mg/mL. Guava, jackfruit, mango, papaya, plum, tamarind, and their seeds were effective against B. subtilis,E. coli,S. aureus, and P. aeruginosa [ 107 ]. A major fruit by-product is tomato seeds from the tomato processing industry; tomato seeds extracts have shown inhibition of Gram-positive bacteria and fungi [ 108 ]. These authors studied the antimicrobial potential of tomato seed extracts against Gram-positive (Bacillus cereus,Enterococcus faecalis,Micrococcus luteus,Staphylococcus aureus and S. epidermidis) and Gram-negative (E. coli,Proteus mirabilis,Pseudomonas aeruginosa, and S. typhimurium) bacteria and fungi (Aspergillus fumigatus,Candida albicans, and Trichophyton rubrum). E. faecalis was the most susceptible Gram-positive bacteria (MIC of 2.5–10 mg/mL). C. albicans was the most susceptible fungal species (MIC of 5–10 mg/mL). Coffee husks, peel, and pulp are some of the main by-products obtained from coffee processing industry [ 2 , 109 , 110 ]; extracts from these by-products contain large amounts of phenolic compounds (tannins, flavonols, flavandiols, flavonoids, and phenol acids) and are potential natural preservatives for food [ 2 ]. Quoting Taveira et al. [ 108 ] and Gyawali and Ibrahim [ 2 ], “the waste produced by the food-processing industry could be incorporated into antimicrobial packaging or utilized as edible antimicrobial films”. 3. Natural Antimicrobials from Animals Some of the animal defence mechanisms have antimicrobial properties [ 1 , 23 ] destroying the cell membranes [1,60] and killing both Gram-negative and -positive bacteria [1]. 3.1. Peptides Antimicrobial peptides from animal origin have a broad range of antibacterial activities as well as antiviral [111]. Antibiotics 2019,8, 208 9 of 30 Pleurocidin is a peptide with antimicrobial activity found in the skin secretions of the winter flounder (Pleuronectes americanus) [ 112 ], and it is active against Gram-positive and -negative bacteria such as E. coli O157:H7, L. monocytogenes,Saccharomyces cerevisiae,Penicillium expansum, and Vibrio parahemolyticus [ 113 , 114 ]. Burrowes et al. [ 113 ] evaluated pleurocidin in food applications using 18 microbial species. Pleurocidin was effective against E. coli O157:H7, L. monocytogenes,P. expansum, S. cerevisiae, and V. parahemolyticus with MIC of 5.3, 23.0, 20.6, 5.5, and 69 µ M, respectively; no haemolytic or cytotoxic effect on intestinal cells were found. Patrzykat et al. [ 114 ] identified peptide effects studying a flounder pleurocidin and frog dermaseptin hybrid. At 2 µ g/mL, dermaseptin inhibited the growth of E. coli but did not kill the cells within 30 min; concentrations equal to or higher than 20 µ g/mL reduced the viable counts by 2 log within 5 min. Pleurocidin showed variations of this antimicrobial pattern. Other antimicrobial peptides are defensins, protamine, magainin, and casocidin [ 1 ]. Defensins are produced by vertebrates-phagocytes of mammals and epithelial cells, with antimicrobial properties against bacteria and fungi, as well as viruses [ 60 ]. Protamine and magainin are active against bacteria and fungi [ 60 , 115 ]: protamine is a protein obtained from sperm cells of vertebrates [ 116 ], and magainin from the skin of the frog Xenopus laevis [ 117 , 118 ]. Protamine is a cationic peptide; its activity against microorganisms is probably due to its electrostatic affinity to negatively charged bacteria. Potter et al. [ 115 ] tested this hypothesis in model broth (tryptic soy broth) and food systems (milk and ground beef). The analysis of 21 bacteria revealed that the most negatively charged were also the most susceptible. Kim et al. [ 116 ] investigated the suppressive effects of protamine on the growth of oral pathogens; 12 strains of streptococci, Actinomyces naeslundii and A. odontolyticus,Aggregatibacter actinomycetemcomitans,Candida albicans,Enterococcus faecalis,Fusobacterium nucleatum,Lactobacillus acidophilus, and Porphyromonas gingivalis were inhibited (MIC of 0.009–20 mg/mL). Zasloff[ 117 ] tested magainin for its antibacterial activity founding that, at low concentrations, inhibited the growth of numerous species of bacteria (E. coli,Enterobacter cloacae,Klebsiella pneumoniae,Staphylococcus epidermidis, Staphylococcus aureus,Citrobacter freundii,Pseudomonas aeruginosa,Pseudomonas putida,Serratia marcescens, Proteus mirabilis, and Streptococcus fecalis) and fungi (Saccharomyces cerevisiae,Cryptococcus neoformans, and Candida albicans) and induce osmotic lysis of protozoa (Amoeba proteus,Euglena gracilis, and Paramecium caudatum). Casocidin is another peptide obtained from bovine milk with antibacterial activity against E. coli and Staphylococcus carnosus [ 119 ]. The primary structure of casocidin is a fragment of 39 amino acids of bovine α s2-casein. The caseinα s2 is not present in human milk, so Zucht et al. [ 119 ] hypothesized that “these findings could explain the different influence of human and bovine milk on the gastrointestinal flora of the suckling.” Lactoferrin is a peptide with capacity against Gram-positive and -negative bacteria, fungi, and parasites [ 2 , 120 , 121 ]. Murdock et al. [ 120 ] determined whether nisin and lactoferrin would act synergistically against L. monocytogenes and E. coli O157:H7. L. monocytogenes was inhibited with 1000 µ g/mL of lactoferrin, although E. coli O157:H7 counts initially decreased and then recovered to cell counts similar to the control. Lactoferrin (500 µ g/mL) plus nisin (250 IU/mL) effectively inhibited the E. coli O157:H7 growth, whereas 250 µ g/mL plus 10 IU/mL, respectively, had an inhibitory effect suggesting that lactoferrin and nisin act synergistically to inhibit both microorganisms. L ó pez-Exp ó sito et al. [ 121 ] studied whether the antimicrobial activity of nisin could be enhanced by lactoferrin f and α s2-casein f against Escherichia coli,Listeria monocytogenes,Salmonella choleraesuis, and Staphylococcus epidermidis. Results showed a synergistic effect against E. coli and S. epidermidis; moreover, another synergistic effect was found between α s2-casein f and nisin against L. monocytogenes because of its capacity to develop resistance to nisin. Lactoferrin binds iron [ 1 , 2 ] and is used as antimicrobial in meat products [ 122 ]. Murdock et al. [ 120 ] and Al-Nabulsi and Holley [ 123 ] reported the antimicrobial activity of lactoferrin against foodborne bacteria such as E. coli,Carnobacterium spp., Klebsiella, and L. monocytogenes. Lactoferrin in a concentration of about 8 mg/mL killed 4 log CFU/mL of Carnobacterium viridans at 4, 10 and 30 ◦C and neutral pH in a broth system [123]. Lactoperoxidase is a protein (glycoprotein enzyme) present in raw milk, colostrum, saliva, and other secretions [ 23 , 124 ]. Lactoperoxidase reacts with thiocyanate and hydrogen peroxide forming Antibiotics 2019,8, 208 16 of 30 were packaged under modified atmosphere conditions with films of polypropylene plus ethylene-vinyl alcohol copolymer (with a 29% ethylene molar content) containing oregano and citral [ 289 , 290 ]. The results showed that antimicrobial activity reduced spoilage microbiota on the salad as well as inhibit the growth of E. coli,S. enterica, and L. monocytogenes; the inhibition was greater against Gram-negative bacteria. Chitosan-based films have been very effective in increasing the shelf-life of different products such as fruits and vegetables [ 291 – 296 ], and different meats and products [ 297 – 300 ]. C é et al. [ 291 ] reported the increase in activity against several bacteria in minimally processed pear after the addition of nisin and peptide P34 to chitosan films: E. coli,B. cereus,Clostridium perfringens, Lactobacillus acidophilus,L. monocytogenes,S. aureus,S. enteritidis,Aspergillus phoenicis, and Penicillium stoloniferum. Films containing natamycin showed similar inhibition than those with chitosan alone. Vodnar et al. [ 297 ] developed chitosan-based films with bioactive compounds from green and black teas for the control of L. monocytogenes on vacuum-packaged ham steak at 20 ◦ C for 10 d and 4 ◦ C for 8 weeks. L. monocytogenes growth was inhibited in a dose-dependent manner: 4% of green tea extract was the most effective at both temperatures; 2% of green tea or 2% and 4% of black tea showed less antibacterial activity. Chitosan lactate was included into low-density polyethylene [ 298 ]; these films were applied on the surfaces of red meat and tested against E. coli,L. monocytogenes, and S. enteritidis. The microorganisms on the meat surface were not inhibited; however, a significant extension of the red colour shelf-life was observed. Soy protein edible films with EDTA or nisin have been studied for their physical and antimicrobial properties [ 301 ]; the films incorporated with 1% of grape seed extract, 10,000 IU/g of nisin, and 0.16% of EDTA showed the greatest activity against L. monocytogenes reducing its population by approximately 3 log CFU/mL. E. coli O157:H7 and S. typhimurium counts were reduced by approximately 2 and 1 log CFU/mL, respectively. 6.3. Nanoparticles and Nanovesicles Nanotechnology is increasing its role in the food industry and some studies have been carried out over the last years. Applications of nanotechnology to deliver natural antimicrobial compounds in foods are very limited because of the complexity of the technology needed and the food matrix. Eby et al. [149] reported that hen egg-white lysozyme catalyzed the formation of silver nanoparticles that were able to maintain the hydrolase function of the enzyme; they were effective against E. coli, Bacillus anthracis,S. aureus, and Candida albicans. These nanoparticles had strong activity against silver-resistant strains of Proteus mirabilis as well as against an antibioticand silver-resistant E. coli strain. Human epidermal keratinocytes studies showed that these nanoparticles were non-toxic at the concentrations used to inhibit microbial growth. Nisin nanoparticles have been tested against L. monocytogenes and S. aureus with good results [ 302 – 304 ], as well as bacteriocin nanovesicles [ 210 ] or nanoparticles [ 208 , 209 ] against different pathogens. Zou et al. [ 302 ] evaluated the prolonged antimicrobial stability of liposome nanoparticles loaded with nisin against L. monocytogenes and S. aureus. The MIC of the nanoparticles against both microorganisms was 320 UI/mL, reducing their populations by more than 6 log CFU/mL after 48 and 72 h of incubation, respectively. Field et al. [ 303 ] identified a nisin A variant with a serine to glycine change at position 29 and with enhanced efficacy against S. aureus. Three more derivatives were developed and tested against E. coli,Cronobacter sakazakii, and S. enterica serovar Typhimurium showing enhanced antimicrobial activity. Encapsulation provides stability to bacteriocins; thus, de Mello et al. [ 210 ] encapsulated the peptide pediocin in nanovesicles of soybean phosphatidylcholine. The nanovesicles maintained 50% of the pediocin antimicrobial activity for 13 d at 4 ◦ C against Listeria monocytogenes,L. innocua, and L. ivanovii. Gold nanoparticles with Lactobacillus acidophilus CH1 bacteriocin were used by Mossallam et al. [ 208 ] against intestinal microsporidiosis in immunosuppressed mice. The anti-microsporidia activity of the bacteriocin was potentiated, showing a sustained reduction in faecal spore shedding and intestinal spore load. Antibiotics 2019,8, 208 17 of 30 7. Conclusions Since consumers increasingly demand food free of synthetic preservatives, it is necessary to identify and study new alternatives. These new approaches should be useful for controlling foodborne pathogens and for extending the foods’ shelf-life. From the economic point of view, the search for natural antimicrobials must be cost-effective, and one alternative approach would be the mixture of several natural antimicrobials combined with food preservation techniques. Due to the complexity of food matrices, natural antimicrobial compounds could bind with some food components limiting their action. Nanoparticles and/or nanovesicles have enormous potential in food safety as an effective antimicrobial delivery system, although this technology has raised concerns over consumers’ safety. Therefore, further research is needed to determine the best antimicrobial delivery technology and the best concentrations of such natural antimicrobial compounds. Author Contributions: All authors contributed equally to the writing and revision of the final version. Funding: The I+D+I Program, Consejer í a de Sanidad, Junta de Castilla y Le ó n, Spain, financially supported this work (SAN196/VA07/07, SAN673/VA05/08, SAN126/09). Conflicts of Interest: The authors declare no conflicts of interest. References 1. Pisoschi, A.M.; Pop, A.; Georgescu, C.; Turcu¸s, V.; Olah, N.K.; Mathe, E. An overview of natural antimicrobials role in food. Eur. J. Med. Chem. 2018,143, 922–935. [CrossRef] [PubMed] 2. Gyawali, R.; Ibrahim, S.A. Natural products as antimicrobial agents. Food Control 2014 ,46, 412–429. 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