PHA can be synthesized either by chemical means or by biological approaches
(Kemnitzer et al. 1993; He et al. 1999). Biosynthesis of PHA leads to much a higher
molecular weight compared with that achieved with chemical methods. However,
biosynthesis of PHA does not allow much control over the monomer structures in
the PHA polymers; the specificity of PHA polymerase (or PHA synthase) will
influence the monomers incorporated into the polymers (Chen et al. 2004). Since
biosynthesis of PHA is conducted by microorganisms grown in an aqueous solution
containing sustainable resources such as starch, glucose, sucrose, fatty acids, and even
nutrients in waste water under 30–37 °C and atmosphere pressure, it is considered
as more environmentally friendly and sustainable, especially when petroleum as a
nonsustainable resource is being depleted quickly, and plastics or fuels based on
petroleum show the same trend.
PHA can be synthesized either by chemical means or by biological approaches(Kemnitzer et al. 1993; He et al. 1999). Biosynthesis of PHA leads to much a highermolecular weight compared with that achieved with chemical methods. However,biosynthesis of PHA does not allow much control over the monomer structures inthe PHA polymers; the specificity of PHA polymerase (or PHA synthase) willinfluence the monomers incorporated into the polymers (Chen et al. 2004). Sincebiosynthesis of PHA is conducted by microorganisms grown in an aqueous solutioncontaining sustainable resources such as starch, glucose, sucrose, fatty acids, and evennutrients in waste water under 30–37 °C and atmosphere pressure, it is consideredas more environmentally friendly and sustainable, especially when petroleum as anonsustainable resource is being depleted quickly, and plastics or fuels based onpetroleum show the same trend.
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