Partitioning and antioxidative effect of protocatechuates in soybean oil emulsions: relevance of emulsifier concentration

Posted on 20 April, 201719 July, 2017 by antiox@uvigo.es

Distributions of a homologous series of protocatechuic acid (PCA) derivatives of increasing lipophilicity were determined in stripped soybean oil-in-water emulsions and compared with their antioxidant (AO) efficiencies. The distribution was determined by employing a recently developed a kinetic method, based on the reaction between the hydrophobic 4-hexadecylbenzenediazonium ions (16-ArN2+) [...]

Physical evidence that the variations in the efficiency of homologous series of antioxidants in emulsions are due to differences in their partitioning

Posted on 13 January, 201710 May, 2017 by antiox@uvigo.es

The relationships between the hydrophilic-lipophilic balance (HLB) of antioxidants (AOs) and their distributions and efficiencies in emulsions are not fully understood. Recent reports indicate that, for series of homologous antioxidants of different hydrophobicity, the variation of their efficiency with the HLB of the AO increases with the alkyl chain length up to a maximum (C3 -C8ester) followed by a decrease [...]