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Optimization of Alcalase hydrolysis conditions for production of Dagaa (Rastrineobola argentea) Protein hydrolysate with antioxidative properties

Ogonda Lydia Awuor, Muge Edward Kirwa, Mbatia Betty and Mulaa Francis Jackim

Enzymatic conditions; stirring speed, pH, temperature, enzyme substrate (ES) ratio, solvent ratio, reaction time; for Dagaa (Rastrineobola argentea) hydrolysis by Alcalase 2.4L® were optimized. This was done to guarantee maximum enzyme activity, minimized losses and subsequent maximized product yield.

This study showed optimized hydrolysis conditions to be fixed at minimum stirring speed (overhead stirrer, Stuart, UK), pH 7, 56°C, ES ratio of 2% (v/w) and solvent ratio of 0.5% (v/w) for 6 h. At these combined optimal conditions, Alcalase 2.4L®Dagaa (Rastrineobola argentea) hydrolysis resulted in 71% protein recovery with 83% degree of hydrolysis.

These findings substantiated the use of Dagaa which proved to be a relatively good substrate for protein hydrolysate production.