The influence of various emulsifiers on the partitioning and antioxidant activity of hydroxybenzoic acids and their derivatives in oil-in-water emulsions
H. Stockmann et al., The influence of various emulsifiers on the partitioning and antioxidant activity of hydroxybenzoic acids and their derivatives in oil-in-water emulsions, J AM OIL CH, 77(5), 2000, pp. 535-542
The partitioning behavior of a series of hydroxybenzoic acids and their der
ivatives was determined in biphasic water-oil systems, emulsifier solutions
, and oil-in-water (O/W) emulsions. The effect of gradually decreasing pola
rity on partitioning behavior and antioxidant efficiency in O/W emulsions w
as investigated by using gallic acid and its esters as antioxidants. Sodium
dodecyl sulfate (SDS), cetyltrimethylammbnium bromide (CTAB), polyoxyethyl
ene 20 cetyl ether (Brij 58), and partially hydrolyzed soybean lecithin (PH
LC, Emultop(R)) were used to investigate the influence of different classes
of emulsifiers on the partitioning behavior. The antioxidant activity of g
allic acid and its methyl, ethyl, propyl, butyl, and octyl esters showed ma
rkedly different trends in O/W emulsions depending on the emulsifier used.
The results are discussed with respect to the properties of the emulsifiers
, such as hydrogen bond basicity, hydrophobic interactions, and structural
properties.