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></span> <span aria-label="breadcrumb separator">/</span> <span class="breadcrumb-current-title">Plant Antimicrobials and the Food Industry: Part 3 - Phytochemicals</span></div></div></header><div class="site-inner"><div class="content-sidebar-wrap"><main class="content"><article class="post-7474 post type-post status-publish format-standard has-post-thumbnail category-microbiology-testing tag-antimicrobial tag-essential-oils tag-flavonoids tag-food-preservation tag-food-safety tag-foodborne-pathogens tag-phytochemicals entry" aria-label="Plant Antimicrobials and the Food Industry: Part 3 – Phytochemicals"><header class="entry-header"><h1 class="entry-title">Plant Antimicrobials and the Food Industry: Part 3 – Phytochemicals</h1> <span class="post-info-author"> By <a href="https://www.thermofisher.com/blog/author/amandamaxwell/" title="Posts by Amanda Maxwell" rel="author">Amanda Maxwell</a> </span> <span class="post-info-date"> 02.02.2016 </span> </header><div class="entry-content"><p><img decoding="async" src="https://www.thermofisher.com/blog/food/wp-content/uploads/sites/5/2016/02/essential_oil_bottles_with_fresh_oregano_leaves.jpg" style="float: left;margin: 20px" alt="Essential oil bottles with fresh oregano leaves" title="Essential oil bottles with fresh oregano leaves" width="330" height="219" />Phytochemicals are components within a plant that often impart taste or flavor. Classified as non-nutritive, these factors can also be antimicrobial—a property that has been exploited throughout history. Many cultures use herbs and spices in both cooking and medicine, as much for the pleasant sensations they impart as for their antimicrobial actions against foodborne pathogens, food spoilage organisms and parasites.</p> <p>Probably the most widely known phytochemicals used as antimicrobials in food preparation, are the essential oils. Found in herbs and spices, studies have shown that the active constituents of essential oils such as thyme and oregano oils, cinnamon and garlic are useful <a href="https://www.thermofisher.com/blog/food/preserving-meat-with-essential-oils/" target="_blank">for controlling pathogens and spoilage microbes in food.</a> </p> <p>The most effective antimicrobial phytochemicals are phenolics, grouped into six families according to structural and chemical similarities, as shown below<sup>1</sup>. </p> <p><strong>Simple Phenolics </strong></p> <p>These phytochemicals exist in a ring structure with varying degrees of substitutions that apparently govern antimicrobial activity. They act by damaging the cell membrane and by altering permeability. The best-known examples of these compounds include eugenol from clove oil, effective against bacteria and viruses, and caffeic acid found in thyme and tarragon, which is also effective against fungi.</p> <p><strong>Flavones and Flavonoids</strong></p> <p>Examples of these polyphenols include catechins in oolong and green tea, which show antiviral activity<em> in vitro</em>. They inhibit microbes by binding to their proteins and to bacterial cell membranes. Citrus flavonoids disrupt quorum sensing in <em>Escherichia coli</em>, thereby inhibiting biofilm formation and colony growth<sup>2</sup>.</p> <p><strong>Quinones</strong></p> <p>Quinones also act against microbes through their binding activity, which inhibits protein actions and makes substrates unavailable. Research has shown that an active quinone found in <em>Pergularia daemia </em>(Forsk.) is active against food pathogens <em>Bacillus subtilis, Staphylococcus aureus</em>, and <em>E. coli, </em>as shown by <em>in vitro </em>testing<sup>3</sup>.</p> <p><strong>Tannins and Coumarins</strong></p> <p>Tannins have activity similar to quinones, in that they are effective against bacteria, yeasts and certain fungi. Other studies also find activity against viruses and methicillin-resistant <em>Staphylococcus aureus</em> (MRSA). Coumarins can be toxic in some species following ingestion. They have medicinal qualities in addition to antimicrobial activity against fungi, bacteria and viruses.</p> <p><strong>Essential Oils</strong></p> <p>Essential oils, also known as terpenes, are volatile agents and secondary metabolites responsible for giving fragrance, taste and smell to plants. In addition to possessing medicinal properties such as combating inflammation and inhibiting tumor cells, essential oils show antioxidant, antifungal, antibacterial and antiviral activity. As such, they are under investigation for use in the food industry to prevent spoilage, reduce foodborne pathogens and <a href="https://www.thermofisher.com/blog/food/the-antimicrobial-impact-of-essential-oils-of-oregano-and-thyme-on-shelf-life/" target="_blank">extend shelf life</a>. Researchers have found antimicrobial activity in various essential oils against <em>Listeria monocytogenes, E. coli </em>O157:H7, <em>Salmonella enterica</em> ser. Typhimurium ATCC® 14028, and <em>Brochothrix thermosphacta.</em></p> <p><strong>Alkaloids</strong></p> <p>Although alkaloids in general show limited antimicrobial activity, berberine appears to be effective against MRSA.</p> <p> </p> <p>Often described as botanicals, phytochemicals are seen as safe additives for use in the food industry. Research into potential uses has shown that synergism between different phytochemicals could improve the antimicrobial action.</p> <p>A study that combined cranberry extract with oregano found greater inhibition of <em>Listeria monocytogenes</em> using the additives in combination rather than alone<sup>4</sup>. The researchers found an optimal ratio for the two resulted in greater inhibition, observing this effect in food matrices such as meat and fish, as well as by agar plate diffusion test. The scientists also found that they could influence antimicrobial action by changing the food matrix environment, showing maximal effect at 4°C.</p> <p><strong>For further discussion on food-borne pathogens and microbial food safety <a href="http://www.thermoscientific.com/en/community/microbiology-testing.html" target="_blank">visit our Food and Beverage Community</a>. </strong></p> <p><strong><span>References</span></strong><span></span></p> <p><span>1. Hintz, T. et al. (2015) “<a href="http://www.hindawi.com/journals/bmri/2015/246264/" target="_blank">The Use of Plant Antimicrobial Compounds for Food Preservation</a>“, BioMed Research International 2015, Article ID 246264 http://dx.doi.org/10.1155/2015/246264</span></p> <p><span>2. Sultanbawa, Y. (2011) “</span>Plant antimicrobials in food applications: Minireview”, in “<a href="http://espace.library.uq.edu.au/view/UQ:266785" target="_blank">Science against microbial pathogens: communicating current research and technological advances</a>” A. Mendez-Vials [Ed.] pp. 1084-1093</p> <p>3. Ignacimuthu, S. et al. (2009) “<a href="https://www.researchgate.net/publication/220008678_Antibacterial_activity_of_a_novel_quinone_from_the_leaves_of_Pergularia_daemia_Forsk_a_traditional_medicinal_plant" target="_blank">Antibacterial activity of a novel quinone from the leaves of Pergularia daemia (Forsk.), a traditional medicinal plant</a>“, Asian Journal of Traditional Medicines   4 (pp.36–40)</p> <p>4. Lin, Y.T. et al. (2004) “<a href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC520903/" target="_blank">Inhibition of Listeria monocytogenes in Fish and Meat Systems by Use of Oregano and Cranberry Phytochemical Synergies</a>“, Applied and Environmental Microbiology (pp.5672–78) DOI: 10.1128/AEM.70.9.5672–5678.2004 </p> <p> </p> <p><strong>Further Reading</strong></p> <p>Nabavi, S.F. et al. (2015) “<a href="http://www.ncbi.nlm.nih.gov/pubmed/26378575" target="_blank">Review: Antibacterial Effects of Cinnamon: From Farm to Food, Cosmetic and Pharmaceutical Industries</a>“, Nutrients 7 (pp.7729-48) doi:10.3390/nu7095359  </p> <p> </p> <p><strong><span>Further reading on Examining Food</span></strong><span></span></p> <p><a href="http://https://www.thermofisher.com/blog/food/plant-antimicrobials-and-the-food-industry-part-1/" target="_blank">Plant Antimicrobials and the Food Industry: Part 1</a></p> <p><a href="https://www.thermofisher.com/blog/food/plant-antimicrobials-and-the-food-industry-part-2-antimicrobial-peptides/" target="_blank">Plant Antimicrobials and the Food Industry: Part 2 – Antimicrobial Peptides</a></p> <p><a href="https://www.thermofisher.com/blog/food/maximizing-rosmarinic-acid-in-sage-extracts/" target="_blank">Maximizing Rosmarinic Acid in Sage Extracts</a></p> <p><span><a href="https://www.thermofisher.com/blog/food/edible-antimicrobial-coatings-inhibit-salmonella/" target="_blank">Edible Antimicrobial Coatings Inhibit Salmonella</a></span></p> <p><span><a href="https://www.thermofisher.com/blog/food/preserving-meat-with-essential-oils/" target="_blank">Preserving Meat with Essential Oils?</a></span></p> <p><span><a href="https://www.thermofisher.com/blog/food/phenolic-profiling-of-culinary-herbs-and-spices-by-hrms/" target="_blank">Phenolic Profiling of Culinary Herbs and Spices by HRMS</a></span></p> <p><span><a href="https://www.thermofisher.com/blog/food/the-antimicrobial-impact-of-essential-oils-of-oregano-and-thyme-on-shelf-life/" target="_blank">The Antimicrobial Impact of Essential Oils of Oregano and Thyme on Shelf-Life</a></span></p> <p> </p> <aside class="mashsb-container mashsb-main "><div class="mashsb_above_buttons">Share this article </div><div class="mashsb-box"><div class="mashsb-count mash-large" style="float:left"><div class="counts mashsbcount">14</div><span class="mashsb-sharetext">SHARES</span></div><div class="mashsb-buttons"><a class="mashicon-facebook mash-large mashsb-noshadow" href="https://www.facebook.com/sharer.php?u=https%3A%2F%2Fwww.thermofisher.com%2Fblog%2Ffood%2Fplant-antimicrobials-and-the-food-industry-part-3-phytochemicals%2F" target="_top" rel="nofollow"><span class="icon"></span><span class="text">Facebook</span></a><a class="mashicon-linkedin mash-large mashsb-noshadow" href="https://www.linkedin.com/shareArticle?trk=Plant+Antimicrobials+and+the+Food+Industry%3A+Part+3+%E2%80%93+Phytochemicals&url=https%3A%2F%2Fwww.thermofisher.com%2Fblog%2Ffood%2Fplant-antimicrobials-and-the-food-industry-part-3-phytochemicals%2F" target="_top" rel="nofollow"><span class="icon"></span><span class="text">Linkedin</span></a><div class="onoffswitch2 mash-large mashsb-noshadow" style="display:none"></div></div> </div> <div style="clear:both"></div><div class="mashsb-toggle-container"></div></aside> <div class="jp-relatedposts"> <div class="related-post related-1"> <a href="https://www.thermofisher.com/blog/food/quantifying-caffeine-in-steeped-tea-using-uv-vis/"><img width="310" height="274" src="https://www.thermofisher.com/blog/food/wp-content/uploads/sites/5/2024/10/iStock-1336864023_steepingtea-310x274.jpg" class="attachment-grid size-grid wp-post-image" alt="Steeping herbal pyramid tea bag in a glass cup" decoding="async" /></a> <span class="grid-content"> <h4 class="entry-title"><a href="https://www.thermofisher.com/blog/food/quantifying-caffeine-in-steeped-tea-using-uv-vis/">Quantifying Caffeine in Steeped Tea Using UV-Vis</a></h4> <p>In the realm of food science, precise quantification of key ... </p> <a href="https://www.thermofisher.com/blog/food/quantifying-caffeine-in-steeped-tea-using-uv-vis/" class="read-more">Read More <i class="fa fa-icon fa-chevron-right"></i></a> </span> </div> <div class="related-post related-2"> <a href="https://www.thermofisher.com/blog/food/dairy-production-in-india/"><img width="310" height="274" src="https://www.thermofisher.com/blog/food/wp-content/uploads/sites/5/2023/10/iStock-1297005108_milkpour-310x274.jpg" class="attachment-grid size-grid wp-post-image" alt="Close-up of raw milk being poured into container with dairy cows in background" decoding="async" loading="lazy" /></a> <span class="grid-content"> <h4 class="entry-title"><a href="https://www.thermofisher.com/blog/food/dairy-production-in-india/">Dairy Production in India</a></h4> <p>The cow is a revered animal in throughout much of India. 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