Abstract
Background: Phytic acid acts as anti-nutritional factor in food and feed ingredients for monogastric animals as they lack phytases.
Objective: Phytase production by Bacillus subtilis subsp. subtilis JJBS250 was studied in solid-state fermentation and its applicability in dephytinization of food.
Methods: Bacterial culture was grown in solid state fermentation using wheat bran and various culture conditions were optimized using ‘One variable at a time’ (OVAT) approach. Effects of different substrates (wheat bran, wheat straw, sugarcane bagasse), incubation time (24, 48, 72 and 96 h), incubation temperatures (25, 30, 35 and 40°C), pH (4.0, 5.0, 6.0, 7.0 and 8.0) and moisture content (1:1.5, 1:2.0, 1:2.5 and 1:3) were studied on phytase production. Bacterial phytase was used in dephytinization of food samples.
Results: Optimization of phytase production was studied in solid state fermentation (SSF) using ‘One variable at a time’ (OVAT) approach. Bacillus subtilis subsp. subtilis JJBS250 grew well in various agroresidues in SSF and secreted high enzyme titres using wheat bran at 30°C and pH 5.0 after incubation time of 48 h with substrate to moisture ratio of 1:3. Glucose and ammonium sulphate supplementation to wheat bran further enhanced phytase production in SSF. Optimization of phytase production resulted in 2.4-fold improvement in phytase production in solid state fermentation. The enzyme resulted in dephytinization of wheat and rice flours with concomitant release of inorganic phosphate, reducing sugar and soluble protein.
Conclusion: Optimization resulted in 2.34-fold enhancement in phytase production by bacterial culture that showed dephytinization of food ingredients with concomitant release of nutritional components. Therefore, phytase of B. subtilis subsp. subtilis JJBS250 could find application in improving nutritional quality of food and feed of monogastric animals.
Keywords: Phytic acid, phytase, Bacillus subtilis subsp. subtilis JJBS250, solid state, fermentation, wheat bran, dephytinization.
Graphical Abstract
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