The aim of this work was to study the production of polyhydroxybutyrate (PHB) using agro- industrial residues as
the carbon source. Seven substrates, viz., wheat bran, potato starch, sesame oil cake, groundnut oil cake, cassava
powder, jackfruit seed powder and corn flour were hydrolyzed using commercial enzymes and the hydrolyzates
assessed for selecting the best substrate for PHB production. Jackfruit seed powder gave the maximum production
of PHB under submerged fermentation using Bacillus sphaericus (19%) at the initial pH of 7.5.
