Polyhydroxyalkanoates (PHA) and α-amylase (-1,4 glucan-4-glucanohydrolase, E.C. 3.2.1.1) were coproduced by Bacillus sp. CFR-67 using unhydrolysed corn starch as a substrate. Bacterial growth and polymer production were enhanced with the supplementation of hydrolysates of wheat bran ( ) and PHA (5.9 g L -1 ). The polymer thus produced was a copolymer of polyhydroxybutyrate-co-hydroxyvalerate of 95:5 to 90:10 mol%.Presence of WBH and corn starch (10-50 g L -1 ) in the medium enhanced fermentative yield of -amylase (2-40 U mL -1 min -1 ). The enzyme was active in a wide range of pH (4-9) and temperature (40-60 o C). This is the first report on simultaneous production of copolymer of bacterial PHA and -amylase from unhydrolysed corn starch and agro-industrial residues as substrates.
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