Antioxidant solubility and efficiency

The solubilities of a series of gallates in water, cetomacrogol solution, and benzaldehyde were determined at 25°. Methyl, ethyl, and propyl gallates were fairly water-soluble but octyl, decyl, and dodecyl gallates were practically insoluble. Generally, solubilities in water and in surfactant solutions increased with decrease in alkyl-chain length. The solubilities of the short-chain gallates in benzaldehyde increased while that of the long-chain members decreased with chain length. The comparative antioxidant efficiency in solubilized systems appeared to be related to the distribution ratios while that in emulsified systems to the solubility of the antioxidant in the aldehyde.