The emulsifying properties of native and N- and C-terminal-deleted phosvitin (protease digests) were compared after conjugation with galactomannan. The emulsifying properties of Maillard-type phosvitin-galactomannan conjugates were greatly improved, whereas those of the protease-digested phosvitin-galactomannan conjugates were not so dramatically improved. Phosvitin was highly glycosylated with galactomannan, whereas the protease-digested phosvitin conjugate consisting of a highly phosphorylated core peptide fragment was not. The results suggest that both N and C termini of the peptide moiety, digested by protease, were essential for the improvement of emulsifying properties of phosvitin-galactomannan conjugates. In addition, the role of N and C termini as anchors in oil droplets was supported from the comparative studies of native phosvitin, phosvitin-galactomannan conjugates, and protease-digested phosvitin-galactomannan conjugates.
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Khan et al. (1999) studied this question.
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