. . . . "ary structure by enzymes, heat or extremes of pH ??? ??? ??? Food additive any substance added to food ??? ??? ??? Food chemistry the systematic evaluation and understanding of water, carbohydrates, lipids, proteins, vitamins, minerals, and other ingredients, such as additives, as they undergo chemical interaction/reaction during the harvest, storage and distribution of foods ??? ??? ??? Preservat" . .