Abstract
Two different types of methyl esters of β-glycyrrhizinate (GK2) have been prepared to delineate the mechanism of the catalytic action of each carboxyl group of GK2 in the hydrolysis of nonionic fatty acid surfactants. In the acidic pH region of less than 4, the hydrolysis is catalyzed by the carboxyl groups of the sugar moiety, while in the close-to-neutral acidic region, the carboxyl group at the hydrophobic triterpenoid end becomes important in catalysis.
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Koide, M., Ukawa, J., Tagaki, W. et al. Hydrolysis of nonionic ester surfactants facilitated by potassium β-glycyrrhizinate: Implication of catalytic functions played by the carboxyl groups. J Amer Oil Chem Soc 74, 49–54 (1997). https://doi.org/10.1007/s11746-997-0118-9
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DOI: https://doi.org/10.1007/s11746-997-0118-9