Production of specific copolymers of polyhydroxyalkanoates from industrial waste |
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Authors: | Wong Phoeby A L Chua Hong Lo Waihung Lawford Hugh G Yu Peter H |
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Institution: | (1) Department of Applied Biology & Chemical Technology, Hong Kong Polytechnic University, Hong Kong, China;(2) Department of Civil and Structure Engineering, Hong Kong Polytechnic University, Hong Kong, China;(3) Department of Biochemistry, University of Toronto, Canada |
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Abstract: | Polyhydroxyalkanoates, biodegradable plastics with the desired physical and chemical properties of conventional synthetic
plastics, are extensively investigated. In this study, specific bacterial strains produced specific copolymers from food waste.
Copolymers of HB and HV (poly3-hydroxybutyrate-co-3-hydroxyvalerate]) were obtained using various ratios of butyric acid
(C4) and valeric acid (C5) as carbon sources. The C4 to C5 ratio affected the melting points of the copolymers. Melting and glass transition temperatures and many other thermal properties
are important parameters relative to in-service polymer applications. Higher ratios of butyrate to valerate gave higher melting
points. When a mixed culture of activated sludge was employed to produce copolymers using food wastes as nutrients, the obtained
copolymers showed various monomer compositions. Copolymers with a higher portion of HV were obtained using soy waste; copolymers
with less HV were obtained using malt wastes. Pure strains, (i.e., Alcaligenes latus DSM 1122, and DSM 1124, Staphylococcus spp., Klebsiella spp.) produced specific copolymers from food waste. Only Klebsiella spp. produced different copolymers; the ratios of HB:HV were 93:7 and 79:21 from malt waste and soy waste, respectively.
The other strains produced polymers of 100% HB. Selecting industrial food wastes as carbon sources can further reduce the
cost of producing copolymers.
Open Laboratory of Chirotechnology of the Institute of Molecular Technology for Drug Discovery and Synthesis
The University Grants Committee Area of Excellence Scheme, Hong Kong |
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