Optimization of Polybutylene Succinate (PBS)-Degrading Enzyme Production from Saccharothrix sp. APL5

Authors

  • Pichapak Sriyapai Srinakharinwirot University
  • Thayat Sriyapai
  • Luksamee Sukrakanchana

Abstract

An actinomycete, Saccharothrix sp. APL5 was isolated from rubbish soil in Thailand and had the ability to degrade polybutylene succinate (PBS) that identified as Saccharothrix texasensis (98% similarity) by 16S rDNA gene analysis. The optimum conditions found for PBS depolymerase production in medium were 1.5% (w/v) PBS as carbon source, 0.12% (w/v) yeast extract as nitrogen source, pH 7 and incubated at 37°C for 96 hours. The highest of specific activity against PBS was determined as 35.6±2.31 U/mg. Strain APL5 could degrade PBS films in basal medium for 56 days at 37°C showed many changes in surface morphology such as erosion and extensive roughening of the surface with pit formation using scanning electron microscopy. The IR spectra of PBS film treated with APL5 showed a broad absorption band in the region of 3400-3000 cm-1(OH stretch) and the less intense peak at of 1740 cm-1(C=O stretch). Partial nucleotides of bioplastic depolymerase gene from strain APL5 was studied. The amino acid of Lpa5 had a highly conserved pentapeptide catalytic triad (Gly-His-Ser-Met-Gly), which has been shown to be part of the esterase-lipase superfamily (serine hydrolase). Keywords : polybutylene succinate, PBS depolymerase, bioplastics, Saccharothrix sp

Author Biography

Pichapak Sriyapai, Srinakharinwirot University

department of Microbiology

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Published

2019-09-27