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The surface tensions of 6-O-hexanoyl, octanoyl, decanoyl and dodecanoyl L-ascorbates , which were synthesized via the immobilized-lipase-catalyzed condensation of ascorbic acid and the corresponding fatty acids in acetonitrile, were measured at 25•Ž by the Wilhelmy method at their various concentrations, and the critical micelle concentration, CMC, and the residual area per molecule , a, were evaluated for each acyl ascorbate. The CMC was lower for the ascorbate with a longer aryl chain , while the a values were ca. 0.30 nm2 for all the acyl ascorbates.

Surface Activity of 6-<I>O</I>-Hexanoyl, Octanoyl, Decanoyl and Dodecanoyl Ascorbates