Isolation and identification of main constitutents in an enzymatically hydrolysed licorice extract sweetener
2001
Liu, H.M. | Akiyama, T. | Sugimoto, N. | Maitani, T.
Licorice extract including glycyrrhizin as the major component is used as a safe sweetener in many countries. Enzymatically hydrolysed licorice extract (EHLE) is also used as a sweetener in Japan. In the present paper, the constituents of EHLE were investigated as apart of the studies for evaluating its quality and safety as a food additive. Three oleanane-type monoglycosides along with glycyrrhizin (1) and 3-O-[beta-D-glucuronopyranosyl-(1 to 2)-beta-D-glucuronopyranosyl]-18beta-liquiritic acid (2) were isolated from EHLE. The structures of the three compounds have been determined to be 3-O-beta-D-glucuronopyranosyl-24-hydroxy-18 beta-glycyrrhetinic acid (3), 3-O-beta-D-glucuronopyranosyl-18beta-glycyrrhetinic acid (4) and 3-O-beta-D-glucuronopyranosyl-18beta-liquiritic acid (5) based on MS and NMR. Compound 4 was the monoglycosylated derivative of glycyrrhizin (1). Compounds 3 and 5 are the monoglycosylated derivatives of the minor constituents in licorice extract. They were first isolated from EHLE, and compound 5 was a new compound.
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