Answer:
Preservatives are the chemical substances which are added to the products like pharmaceuticals, paints, biological samples, foods and many other products to prevent the disintegration or rotting mainly caused by the growth of microbes or due to undesirable chemical changes.Preservations are of 2 types i.e. chemical & physical. Chemical preservation means addition of chemical compounds to the products. Physical preservation means process such as refrigeration & drying. Preservatives aims at decreasing the risk of foodborne infections, reduce microbial spoilage & to improve nutritional quality. Some physical methods used for food preservation include dehydration, freeze drying, refrigeration & UV-C radiation. Chemical And physical preservation are sometimes used in the combination.
The advantages of using the food preservatives are:
- Decrease the moisture content
- Increase the acidity
- Preventing the ripening process( naturally)
- Acts as an antioxidant
- Lowering the food waste
Main properties of ideal preservatives :
- It should not be poisonous
- It should not be irritant
- It should have physical as well as chemical stability
- Preservative must maintain the good compatibility with other ingredients used in the process of developing food
- It should acts as preservative in small concentration
- It should retains activity through food manufacturing, shelf life & usage
Toxicology is the study of how chemicals can affect both people and other living things.
<h3>What is the importance of toxicology?</h3>
The scientific study of harmful effects caused by chemicals on living things is known as toxicology. It entails keeping track of and documenting symptoms that appear after exposure to harmful chemicals. Typically, toxicity only occurs when a chemical that may be harmful reaches sensitive tissues, such the reproductive organs, in excess of a predetermined amount.
- The processes by which these compounds cause toxicity will be investigated by toxicologists, as well as the methods for identifying these substances in diverse sample types.
- A further aspect of toxicology is determining the best ways to handle people or animals that have been exposed to specific poisons.
- Environmental toxins, naturally occurring chemicals, pharmaceutical compounds created for human use in medicine, and other substances are all evaluated by toxicologists.
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No the atmospheric carbon dioxide levels are not straight in fact there is to,much that is why we have global warming
