Abstract
Publisher Summary This chapter focuses on the microbial degradation of polyesters in the marine environments and the properties of extracellular depolymerases from some polyester-degrading micro-organisms. The microbial polyester samples were produced by a controlled fermentation. P(3HB) homopolymer was produced from butyric acid by Alcaligenes eutrophus . The changes in the molecular weights and mechanical properties of polyesters were studied before and after the exposure in sea water. The degradation of microbial polyesters in the sea water may involve a simple hydrolytic degradation process in addition to a microbial (enzymatic) degradation. The purification and properties of PHA depolymerases is discussed in this chapter. The activity of PHA depolymerase was maximum at the end of logarithmic growth phase. The purification of an extracellular PHA depolymerase from C. testosteroni was performed by ammonium sulphate fractionation and a hydrophobic interaction column chromatography. The chapter also concludes with hydrophobicity of PHA depolymerases.
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