Biosynthesis of polyhydroxyalkanoates from styrene by Enterobacter spp. isolated from polluted environment

Abstract

BACKGROUND: Styrene and its metabolites are known to have serious adverse effects on human health and hence, strategies to prevent its release, eradicate it from the environment, and understand its route of degradation are being considered.

METHODS: A total of 18 strains were isolated from 4 samples of diesel contaminated soils. Among them 5 strains were selected for their ability to degrade styrene and use it as a sole carbon source to produce PHA. These strains were identified as Enterobacter spp. on the basis of 16S rRNA gene sequencing. Bacteria were screened for their ability to produce PHA by utilizing glucose and styrene as a carbon sources. Screening for PHA production was done by Nile blue A, Sudan black B, and phase contrast microscopy and the selected 3 strains showed positive results. Growth kinetics along with time profiling of PHA was performed for glucose and styrene as carbon sources.

RESULTS:PHA extraction was done at equal intervals of 12 h by sodium hypochlorite method which showed that these strains accumulate maximum amount of PHA after 48 h in glucose (30.60%). FTIR analysis of PHA was done which revealed homopolymer PHB and copolymer (PHB-co-PHV) production in strains by utilizing glucose and styrene. Gas chromatography mass spectrometry was carried out to identify the metabolites produced by bacterial strains grown on styrene. Metabolites of styrene degradation included propyne and phenylalanine. Genomic DNA isolation was carried out to amplify phaC gene which encodes PHA synthase enzyme.

CONCLUSIONS: The conversion of styrene to polyhydroxyalkanoates (PHA) provides a new and unique link between an aromatic environmental pollutant and aliphatic PHA accumulation.

Keywords

biodegradable polymers / environmental pollutants / PHA / FTIR / recycling / bacteria

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