Biochemistry

When heated, the action of acids and bases fructose undergoes destruction with the formation of 5-hydroxymethylfurfural . Fructose reduction leads to the formation of mannitol and sorbitol . In the human body, a large role is played by phosphoric esters of fructose (fructose-6-phosphate and fructose- 1 ,6-diphosphate), which are intermediate products of carbohydrate metabolism. Fructose is used in the diet of patients with diabetes and obese people. D- mannose can be in acyclic and cyclic forms. HO-C-H HO- (acyclic form) (cyclic forms) D- mannose In its free form, it is rarely found (for example, in the peel of oranges) and is usually part of complex carbohydrates - mannans. In humans and animals, it is found in blood serum, saliva, intestinal mucus, and in articular fluid . Resulting in the reduction of mannose hexahydroxyalcohols mannitol is present in the sap of certain tropical plants and algae. Since this hexose is fermented by yeast, it is introduced into the composition of nutrient media for some microorganisms. D -galactose (cerebrosis) occurs in acyclic and cyclic forms. H OH (acyclic form) (cyclic forms) D -galactose 144