Abstract
The stability of wheat bran proteases for producing angiotensin I-converting enzyme (ACE) inhibitory peptides during storage was investigated. The aspartic proteinase activity upon storage at 15, 20, and 30°C was > 90% of initial levels after 30 days, while storage at 40 and 50°C resulted in levels of 87.3 and 63.1%, respectively. The carboxypeptidase activity remained constant at all temperatures during the storage period. The yields of ACE inhibitory peptides from wheat bran at 15, 20, 30, 40, and 50°C after 30 days were 99.0, 98.0, 97.1, 97.1, and 92.2% of the initial level, respectively. The ACE inhibitory activity of all fractions was > 95% of the initial level. These results indicated that the storage of wheat bran at 15 to 40°C results in maintenance of the ACE inhibitory peptide-producing activity, for at least 30 days.
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