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NATURAL MECHANISMS: Avoiding the Ingestion of Toxic Foods and Pathogens Emily Blumenthal Samantha Paustian INTRODUCTION “Protecting Ourselves From Food,” an article by P.W. Sherman and S.M. Flaxman, presents the following ideas: Spices hold antimicrobial properties and can be used as a mechanism against ingesting toxins The use of these spices varies within different geographical and climactic conditions For example, Indian cuisine contains a larger number of spices than cuisine found in colder parts of the country, such as Norway Another mechanism, morning sickness during human pregnancy, helps the mother to avoid ingesting the most probable teratogens in order to protect the growing embryo INTRODUCTION From these findings, further research will be done to investigate the antimicrobial mechanisms and properties of spices such as: Onions Garlic Thyme Cinnamon Cloves INTRODUCTION Morning sickness will also be investigated with the following questions: During what trimester does morning sickness occur most often, and how does this relate to fetal development? What spices and foods are particularly avoided during pregnancy? Do any spices have any positive or negative effects on embryo development? Although they may inhibit certain bacteria from proliferating, do those spices hold a toxic effect as well? RESULTS – ONIONS AND GARLIC (GENUS ALLIUM) The article “Antimicrobial activity of essential oil extracts of various onions (Allium cepa) and garlic (Allium sativum)” by N. Benkeblia was studied: Bacteria such as S. aureus and S. Enteriditis were inhibited by garlic and onions, as well as certain fungi including Aspergillus niger, Penicillium cyclopium and Fusarium oxysporum. These bacteria and fungi are commonly found in food spoilage. Organo-sulfur containing compounds play a large role in the antimicrobial activity of onions and garlic: Cysteine sulfoxides are converted by the enzyme allinase to thiosulfates when plant tissues are cut. Allicin is a cysteine sulfoxide found in garlic that has not only a large amount of inhibitory activity, but also holds antibiotic properties comparable to known antibiotics (1 mg of allicin = 15 IU of penicillin) RESULTS – THYME (THYMUS VULGARIS) The articles “The antimicrobial effect of thyme essential oil, nisin, and their combination against Listeria monocytogenes in minced beef during refrigerated storage” by N. Solomakos, A. Govaris, P. Koidis and N. Botsoglo was studied: L. monocytogenes, a food pathogen found within minced beef, was shown to be inhibited by thyme essential oil. The herb thyme largely contains the phenols thymol and carvacrol, which have been found to inhibit many gram-positive bacteria. Thymol, a hydrophobic molecule, has the ability to pass through the lipopolysaccharide of gram-negative bacterial cell membranes and therefore disturb cell structure (P. Tippayatum, et al, 2007) (Note: this experiment also included using a combination of thyme EO and nisin, a polypeptide bacteriocin produced by certain strains of Lactococcus lactis, which adds to the inhibitory effect by forming pores within the cytoplasmic membrane of gram-positive bacteria.) RESULTS – CINNAMON (CINNAMOMUM VERUM) AND CLOVE (SYZYGIUM AROMATICUM) The article “Antimicrobial activity of cinnamon and clove oils under modified atmosphere conditions” by N. Matan, H. Rimkeeree, A. J. Mawson, P. Chompreeda, V. Haruthaithanasan, and M. Parker; was studied: The following fungi, yeasts, and bacteria are major spoilage organisms found in intermediate moisture foods (such as bread, fish, condiments, cheeses, and meats) and were almost all inhibited by cinnamon and clove essential oil (exception being A. flavus, the most resistant organsim, which required a combination of both oils and at a higher concentration): Fungal species: Aspergillus flavus, Penicillium roqueforti, Mucor plumbeus and Eurotium Yeast species, Debaryomyces hansenii, Pichia membranaefaciens, Zygosaccharomyces rouxii and Candida lipolytica Bacteria species, Staphylococcus aureus and Pediococcus halophilus RESULTS – CINNAMON (CINNAMOMUM VERUM) AND CLOVE (SYZYGIUM AROMATICUM), CONT’D The compounds cinnamaldehyde (found exclusively in cinnamon) and eugenol (found in cloves, as well as cinnamon) are accountable for the antimicrobial activity exhibited in both spices. Both inhibit production of an essential enzyme by bacteria, and may also cause damage to bacteria cell walls. Eugenol, a hydrophobic molecule like thymol, also has the ability to pass through the lipopolysaccharide of gram-negative bacterial cell membranes and therefore disturb cell structure (P. Tippayatum, et al, 2007). RESULTS – MORNING SICKNESS The article “Morning Sickness: A Mechanism for Protecting Mother and Embryo”, by same authors P.W. Sherman and S.M. Flaxman was investigated: Morning sickness, also known as NVP (nausea and vomiting in pregnancy) is an adaptive mechanism to combat ingestion of potentially harmful foods. NVP occurs primarily during the first half of pregnancy, peaking between the 9th and 14th weeks. Surprisingly, this window between the 9th and 14th weeks is also when embryo organogenesis and development of the central nervous system peaks and vulnerability to teratogens is at its highest. Figure 7 of “Protecting Ourselves From Food,” by P.W. Sherman and S.M. Flaxman RESULTS – MORNING SICKNESS, CONT’D The occurance of morning sickness is also related to instances of miscarriage or spontaneous abortion. The number of miscarriages decreases drastically when nausea and vomiting are present during pregnancy Figure 6 of “Morning Sickness: A Mechanism for Protecting Mother and Embryo”, by same authors P.W. Sherman and S.M. Flaxman RESULTS – MORNING SICKNESS, CONT’D Most women had the most aversions to meat products such as beef, poultry, eggs, and fish, which hold more pathogens and/or parasites than other types of foods. Women were less susceptible to morning sickness if their previous diet consisted of staple plants, with the main one being corn. Some phytochemicals found in spices, which in smaller quantities can yield antimicrobial benefits, may be detrimental to a growing embryo if too much is ingested. Example: Capsaicin, found in chili peppers, can be therapeutic in smaller doses, but has been found to be associated with ulceration, necrosis, and carcinogenesis in larger amounts. DISCUSSION - SPICES Overall, the five spices that were researched (onion, garlic, thyme, cinnamon, and cloves) all exhibited antimicrobial activity. The incorporation of these spices into food dishes greatly reduces the risk of ingesting foodborne pathogens and/or parasites. Further usage of the findings of these studies include incorporation of phytochemicals found in spices within food packaging. Drawbacks to this include the strong aromas and tastes exhibited by the spices, which will affect the final outcome of the manufactured food product, whether intended or not. The compounds within onions and garlic are also unstable, making them unlikely candidates for use in food preservation. However, N. Matan, et. al., suggest that using the volatile gas forms of essential oils may decrease the strength in odor and taste of the spice, although a higher volume may be needed. DISCUSSION – MORNING SICKNESS Research revealed that morning sickness, or NVP, is a naturally occurring mechanism to decrease ingestion of possible teratogens. Its linkage to embryo organogenesis gives evidence to this theory of adaptive protection to the embryo. Foods that were particularly avoided by women during pregnancy were those that had the possibility of containing parasites and pathogens; foods that were favored were mainly grains, fruits and vegetables, which carry a smaller risk of illness. SUMMARY Spices contain phytochemicals that can act as antimicrobial agents in food, inhibiting many species of fungi, bacteria, and yeasts. The phytochemicals in spices and their essential oils interfere and destabilize the operation of the phospholipid bilayer of the cell wall and also impede with enzyme systems and genetic material of bacteria. Before refrigeration, recipes integrated these spices to make the food taste better and help from spoiling. Morning sickness is not really a sickness but an adaptation to protect the mother and her baby in the most sensitive period of pregnancy where fetal development is at its highest. In the first trimester, the embryo is most at risk for miscarriage due to illness of the mother or from exposure to toxins. Mothers who exhibit a higher occurrence of NVP during the first trimester have a much lower risk of miscarriage. SUMMARY, CONT’D Why is this all important to us?: Spice usage in foods where refrigeration is unavailable could help prevent outbreaks of food-borne pathogens Food industries, like restaurants and packagers, could use this information to help serve and deliver safer food and to have a better appreciation for spice usage and its history. At some point in our lives we will know someone who is pregnant or will have children ourselves. Understanding that morning sickness is a function to help the mother and baby will reduce stress and confusion; knowing that the first trimester is when the embryo is most susceptible to teratogens will inform the mother to be most careful of her diet during that time. Future research could include: The application of spices in food packaging and its effectiveness compared to other methods Determining effective therapeutic dosages of spices in order to achieve maximum benefit, as well as determining its level of toxicity The investigation of NVP as purely a human phenomenon, or if it applies to other mammals, such as primates References Benkeblia,N. 2004. Antimicrobial activity of essential oil extracts of various onions (Allium cepa) and garlic (Allium sativum). Food Science and Technology. Vol 37, No.2: 263-268. Matan,N., Rimkeeree,H., Mawson, A.J., Chompreeda, P., Haruthaithanasan, V., and Parker, M. 2006. Antimicrobial activity of cinnamon and clove oils under modified atmosphere conditions. International Journal of Food Microbiology. Vol 107: 180-185. Sherman, P.W. and Flaxman, S.M. 2008. Morning Sickness: Adaptive Cause or Nonadaptive Consequence of Embryo Viability? The American Naturalist. Vol 172, No.1:54-62. Sherman, P.W. and Flaxman, S.M. 2001. Protecting Ourselves From Food. American Scientist. Vol 89:142-151. Solomakos,N., Govaris, A., Koidis, P., and Botsoglo, N. 2008. The antimicrobial effect of thyme essential oil, nisin, and their ombination against Listeria monocytogenes in minced beef during refrigerated storage. Food Microbiology. Vol 25: 120-127. Tippayatum, P. and Chonhenchob, V. 2007. Antibacterial Activites of Thymol, Eugenol and Nisin Against Some Food Spoilage Bacteria.Natural Science. Vol41: 319-323.