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5.3.13 Conclusions
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This section has covered only a few of the pesticides available today on the United States and world markets. An understanding of the basic chemical processes affected by pesticides has led to the discovery and production of new families of chemicals. Today s modern pesticide is generally safe to use if the directions on the label are followed. Advances in instrumentation and an understanding of how adverse health effects are produced have resulted in the production of many environmentally friendly but effective pesticides.
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FOOD ADDITIVES AND CONTAMINANTS
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Chemicals are added to food for a number of reasons: as preservatives with antibacterial, antifungal, or antioxidant properties; to change physical characteristics, particularly for processing; to change taste; to change color; and to change odor. In general, food additives have proved to be safe and without chronic toxicity. Many were introduced when toxicity testing was relatively unsophisticated, however, and some of these have been subsequently shown to be toxic. Table 5.4 gives examples of different types of organic food additives. Inorganics, the most important of which are nitrate and nitrite, are discussed later. Certainly hundreds, and possibly thousands, of food additives are in use worldwide, many with inadequate testing. The question of synergistic interactions between these compounds has not been explored adequately. Not all toxicants in food are synthetic; many examples of naturally occurring toxicants in the human diet are known, including carcinogens and mutagens.
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TOXINS
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Table 5.4 Examples of Organic Chemicals Used as Food Additives Function Preservatives Class Antioxidants Fungistatic agents Example Butylatedhydroxyanisole Ascorbic acid Methyl p-benzoic acid Propionates Bactericides Sodium nitrite Calcium silicate Sodium aluminosilicate Propylene glycol Monoglycerides EDTA Sodium tartrate Gum ghatti Sodium alginate Propylene glycol Glycerol Saccharin Mannitol Aspartame Piperonal Vanillin Tartrazine (FD&C yellow5) Sunset Yellow Thiamin Vitamin D3 Alanine Aspartic acid Manganese sulfate Zinc sulfate
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Anticaking agents Emulsi ers Chelating agents Stabilizers Humectants
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Synthetic avors Color modi cation Nutritional supplements Synthetic dyes Vitamins Amino acids Inorganics
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5.5 5.5.1
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A discussion of toxins rst necessitates the understanding and distinction between the toxicological terms toxicant and toxin. A toxicant is any chemical, of natural or synthetic origin, capable of causing a deleterious effect on a living organism. A toxin is a toxicant that is produced by a living organism and is not used as a synonym for toxicant all toxins are toxicants, but not all toxicants are toxins. Toxins, whether produced by animals, plants, insects, or microbes are generally metabolic products that have evolved as defense mechanisms for the purpose of repelling or killing predators or pathogens. The action of natural toxins has long been recognized and understood throughout human history. For example, ancient civilizations used natural toxins for both medicinal (therapeutic) and criminal purposes. Even today, we continue to discover and understand the toxicity of natural products, some for bene cial pharmaceutical or therapeutic purposes whose safety and ef cacy are tested, and some for other less laudable purposes like biological or chemical warfare. Toxins may be
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CLASSES OF TOXICANTS: USE CLASSES
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classi ed in various ways depending on interest and need, such as by target organ toxicity or mode of action, but are commonly classi ed according to source.
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5.5.2 Microbial Toxins
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The term microbial toxin is usually reserved by microbiologists for toxic substances produced by microorganisms that are of high molecular weight and have antigenic properties; toxic compounds produced by bacteria that do not t these criteria are referred to simply as poisons. Many of the former are proteins or mucoproteins and may have a variety of enzymatic properties. They include some of the most toxic substances known, such as tetanus toxin, botulinus toxin, and diphtheria toxin. Bacterial toxins may be extremely toxic to mammals and may affect a variety of organ systems, including the nervous system and the cardiovascular system. A detailed account of their chemical nature and mode of action is beyond the scope of this volume. The range of poisonous chemicals produced by bacteria is also large. Again, such compounds may also be used for bene cial purposes, for example, the insecticidal properties of Bacillus thuringiensis, due to a toxin, have been utilized in agriculture for some time.
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