3.1 Antioxidant
The working of anti-oxidants is shown in figure 8. The substances which hold back the deterioration by oxidation like of fats, oils, foods etc., some components like Vitamin C, Vitamin E etc. responds to the damaging effects of oxidation in a living organism. The free radicals possessing an unpaired electron which are considered as fragments of molecules that are generally very reactive. They are continuously produced in the cells as by-products of metabolism [39]. Plants naturally have tendency to develop some specific anti-oxidative defense enzymes like catalase, peroxidase, polyphenol oxidase, ascorbate peroxidase and glutathione reductase etc. to control the free radicals of oxygen under various environmental stress conditions [40]. To avoid threats related to the oxidative stress, antioxidant is required in the form of food supplement [41].