Green solvent extraction and properties characterization of Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) biosynthesized by mixed microbial consortia fed fermented dairy manure

BIORESOURCE TECHNOLOGY REPORTS(2022)

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Abstract
The aims of this study were to assess the large-scale extraction and recovery of poly(3-hydroxybutyrate-co-3hydroxyvalerate) (PHBV) biosynthesized by mixed microbial consortia (MMC) that was fed fermented dairy manure at the pilot level using green solvents (ethanol, cyclohexanone (CYC), and dimethyl carbonate (DMC)). The reflux extraction procedure with CYC for 3 h at 130 degrees C and DMC for 4 h at 90 degrees C showed the highest recovery (32.3%) with an overall pure yield of 30.0%. A modified Soxhlet extraction process was also evaluated and gave lower crude (18-20%) and purified (12.7-13.8%) PHBV yields. The molar mass of extracted PHBV with DMC in reflux was 7.07 x 105 g & sdot;mol- 1 which was comparable to the control. The thermal, mechanical, and rheological behavior of extracted PHBV were also examined. Mechanical properties result showed that strength and modulus values of the polymers extracted in the large Soxhlet extractor were lower than those extracted by reflux.
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Key words
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate),Polymer Extraction,Green Solvent,Thermal properties,Rheology,Mechanical properties
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