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Microbial Polyhydroxyalkanoate Co-polymers From BiowastesBY: Subhasree Ray | Category: Environmental-Biotechnology | Submitted: 2016-09-14 11:45:24
Article Summary: "Polyhydroxyalkanoate (PHAs) are natural, biodegradable biopolymers. These can be used to replace petro-plastics. Bacteria can produce PHAs from diverse substrates. In general, bacteria produce polyhydroxybutyrate (PHB). PHBs have poor commercial value due to their brittle nature and low strength. Whereas, co-polymers of PHA, hav.."
Microbial Polyhydroxyalkanoate Co-polymers From Biowastes
Authors: Subhasree Ray, Shikha Koul, Jyotsana Prakash, Vipin Chandra Kalia
Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, Delhi-110007.
Bacteria can produce biopolymers such as polyhydroxyalkanoates (PHAs) from cheap and renewable biowastes. Most bacteria produce homopolymers of hydroxybutyrate (PHB). The economical feasibility of PHBs is low because of their brittle nature, poor strength and elasticity. These limitation can be overcome by producing co-polymers of PHAs.
Co-polymers of polyhydroxyalkanoate (PHAs)
The ability of bacteria to produce co-polymers depends mainly upon carbon (C) source and supplements, etc. These inputs can be procured from pure sugars and volatile fatty acids (VFAs). Alternatively, biowastes can be exploited as feed material with desired kind of C and VFAs. Different bacteria can hydrolyze biowastes which can be metabolize by PHA producers.
Ralstonia, Cupriavidus and Pseudomonas species are well known to produce homopolymers and co-polymers: P(3HB-3HV-3HHx), P(HD-HDD-HO-HHx), P(3HB-3HHx) from vegetable oils, and glycerol which have been provided with valeric acid (VA) or levulinic acid, FAME +VA. Azotobacter, Klebsiella, Rhizobium, Sphigomonas, Comamonas and Haloferax have been reported to produce co-polymers of PHA from agricultural wastes, dairy products, oily wastes and industrial wastes.
Bacillus, Clostridium , Norcardia, Microlunatus, Streptomyces, Corynebacteria, Rhodococcus, Staphylococcus are among the gram-positive organisms which are capable of producing co-polymers of PHA from: (i) on pea-shell slurry, (ii) crude glycerol, (iii) apple poamace, (iv) potato peels, (v) onion peels, (vi) agricultural waste, and (vii) mahua flowers (Madhuca sp.).
Bacillus sp. such as B. thuringiensis, B. cereus, and B. megaterium can metabolize biowastes to co-polymers, like: P(3HB-3HHx), P(3HB-3HV-3HHx), P(HD-HDD-HO-HHx), etc. in an efficient manner. Here, 3HV, 3HHx, and 3HO can account upto 64.5 mol% of the total PHA co-polymer.
In conclusion, we may need to choose a combination of feed material and bacteria to produce PHA co-polymers of the desired composition. Bacillus, a GRAS organism is emerging as a potential PHA co-polymer producer.
Kumar P, Patel SKS, Lee JK, Kalia VC (2013) Extending the limits of Bacillus for novel biotechnological applications. Biotechnol Adv 31:1543-1561. doi: 10.1016/j.biotechadv.2013.08.007
 Kumar P, Ray S, Kalia VC (2016) Production of co-polymers of polyhydroxyalkanoates by regulating the hydrolysis of biowastes. Bioresour Technol 200:413-419. doi:10.1016/j.biortech.2015.10.045
 Kumar P, Ray S, Patel SK, Lee JK, Kalia VC (2015) Bioconversion of crude glycerol to polyhydroxyalkanoate by Bacillus thuringiensis under non-limiting nitrogen conditions. Int J Biol Macromol 78:9-16. doi:10.1016/j.ijbiomac.2015.03.046
 Kumar P, Singh M, Mehariya S, Patel SKS, Lee JK, Kalia VC (2014) Ecobiotechnological approach for exploiting the abilities of Bacillus to produce co-polymer of polyhydroxyalkanoate. Indian J Microbiol 54:151-157. doi:10.1007/s12088-014-0457-9
 Opgenorth PH, Korman TP, Bowie JU (2016) A synthetic biochemistry module for production of bio-based chemicals from glucose. Nat Chem Biol 12:393-395. doi: 10.1038/nchembio.2062
 Singh M, Kumar P, Patel SKS, Kalia VC (2013) Production of polyhydroxyalkanoate co-polymer by Bacillus thuringiensis. Indian J Microbiol 53:77-83. doi:10.1007/s12088-012-0294-7
 Singh M, Kumar P, Ray S, Kalia VC (2015) Challenges and opportunities for customizing polyhydroxyalkanoates. Indian J Microbiol 55:235-249. doi:10.1007/s12088-015-0528-6
 Singh M, Patel SKS, Kalia VC (2009) Bacillus subtilis as potential producer for polyhydroxyalkanoates. Microb Cell Fact 8:38. doi:10.1186/1475-2859-8-38
About Author / Additional Info:
Researcher in Microbial Biotechnology and Genomics at CSIR-IGIB, Delhi.
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