STABILIZATION OF MICROBIAL ENZYMATIC PREPARATIONS USED IN FEED INDUSTRY

Abstract

The enzymatic compound with protease activity obtained by Bacillus licheniformis CM1T 1.33 cells fermentation was entrapped in sol-gel matrixes, using TEOS as precursor. The sol-gel technique is a soft method for silica glass synthesis at room temperature. In silica gels, the enzymes maintain their catalytic activity for a longer period o f time and present high stability at environmental factors. Bacillus licheniformis CMIT 1.33 enzyme was also immobilized by entrapment in silica gels deposited on a ceramic support. The optimal temperature and pH o f the native and. immobilized enzyme did not vary significantly. At temperature and pH values lower than the optimum, the relative activities have been higher for the immobilized compound. The immobilization o f the enzymatic compound increased the stability. The enzymatic compounds with protease activity obtained by silica gels entrapment and entrapment/deposition on ceramic support can be used as forage additive.

Keywords

• feed enzymes
• microbal proteases
• bacillus licheniformis
• immobilization
• sol-gel
• teos