Major antigens are carbohydrates in nature, e.g., blood group substance. Important part of nucleic acids and free nucleotides and coenzymes. Important structural components in animal and plant cells. There are some carbohydrates, which do not have this general formula, e.g., amino sugars and deoxy sugarsĤ Second Definition (new definition): Carbohydrates are aldehyde (CHO) or ketone (C=O) derivatives of polyhydric alcohols (have more than one OH group) or compounds which yield these derivatives on hydrolysis. There are substances which are not carbohydrates but have the formula CnH2nOn, e.g., acetic acid CH3COOH (C2H4O2) and lactic acid. (C3 H6 O3) Hydrogen and oxygen are present in 1:2 ratio the same ratio as water, so the French called them “Hydrates de Carbon”, i.e., carbo-hydrates Cn(H2O)n.ģ The old definition is inaccurate because: Definition of carbohydrates: First Definition (Old definition): Carbohydrates are substances containing carbon, hydrogen and oxygen having the general formula CnH2nOn.
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