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Microbial polyhydroxyalkanoates(PHA)have been developed as bioplastics for the past many years.Commercial PHA are normally poly-3-hydroxybutyrate(PHB),copolyesters of 3-hydroxybutyrate and 3-hydroxyhexanoate(PHBHHx),copolyesters of 3-hydroxybutyrate and 4-hydroxybutyrate(P3HB4HB),as well as copolyesters of 3-hydroxybutyrate and 3-hydroxyvalerate(PHBV).