Citrate Buffer, pH 4.8 is used as a buffer in molecular biology, tissue culture and Enzyme kinetics. 0.1 M Citrate Buffer, pH 4.8 is composed of Citric acid and Tri Sodium Citrate. Citrate buffer is a common ingredient of pharmaceutical preparations with a pH in the acid range and it also plays a major role in photolysis of riboflavin in aqueous solution.