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Acid-catalyzed hydrolysis of hesperidin at elevated temperatures
K Grohmann1, J A Manthey, R G Cameron
1US Citrus and Subtropical Products Laboratory, Winter Haven, FL 33881, USA. grohmann@citrus.usda.gov
Abstract:
Dilute sulfuric acid was used as a catalyst for hydrolysis of hesperidin suspensions in water at temperatures ranging from 25 to 180 degrees C. Significant acceleration of the reaction was observed at 120 degrees C and higher temperatures. This increase in the rate of hydrolysis can be attributed to increased solubilization of hesperidin in water at higher temperatures. Partial hydrolysis of hesperidin at 140 degrees C was used for the preparations of hesperetin-7-glucoside, which has a value in the synthesis of dihydrochalcone sweeteners. Simple separation of hesperetin and hesperetin-7-glucoside by extraction with dry acetone or lower alcohols has been developed.