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Applied Microbiology and Biotechnology

, Volume 74, Issue 1, pp 1–12 | Cite as

Increased diversification of polyhydroxyalkanoates by modification reactions for industrial and medical applications

  • Baki HazerEmail author
  • Alexander Steinbüchel
Mini-Review

Abstract

A wide range of diverse polyhydroxyalkanoates, PHAs, is currently available due to the low substrate specificity of PHA synthases and subsequent modifications by chemical reactions. These polymers are promising materials for a number of different applications due to their biocompatibility and biodegradability. This review summarizes the large variability of PHAs regarding chemical structure and material properties that can be currently produced. In the first part, in vivo and in vitro biosynthesis processes for production of a large variety of different PHAs will be summarized with regard to obtaining saturated and unsaturated copolyesters and side chain functionalized polyesters, including brominated, hydroxylated, methyl-branched polyesters, and phenyl derivatives of polyesters. In the second part, established chemical modifications of PHAs will be summarized as that by means of grafting reactions and graft/block copolymerizations, as well as by chlorination, cross-linking, epoxidation, hydroxylation, and carboxylation, reactions yield further functionalized PHAs.

Keywords

Chemical modifications of PHAs Copolyesters Microbial polyesters Poly(3-hydroxyalkanoate)s PHA PHA constituents 

Notes

Acknowledgment

This work was financially supported by TUBITAK (Turkey) grant no. 104M128. Studies of A.S. were supported by the grant provided by the Deutsche Forschungsgemeinschaft in the past.

Glossary of PHAs

mclPHA

medium chain length poly(3-hydroxyalkanoic acid)

PHA

polyhydroxyalkanoates

PHB

poly(3-hydroxybutyrate)

PHBV

poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

PHBHp

poly(3-hydroxybutyrate-co-3-hydroxyheptanoate

PHBHx

poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

PHD

poly(3-hydroxydecanoate)

PHN

poly(3-hydroxynonanoate)

PHO

poly(3-hydroxyoctanoate)

PHOU

poly(3-hydroxy octanoate-co-3-hydroxy undecenoate)

PHPE

poly(3-hydroxy-4-pentenoic acid)

PHU

poly(3-hydroxy-10-undecenoate)

PHV

poly(3-hydroxyvalerate)

PH5PoxV

poly(3-hydroxy-5-phenoxy valerate)

PH6PHx

poly(3-hydroxy-6-phenyl hexanoate)

PH8-pMPoxO

poly(3-hydroxy-p-methylphenoxy octanoate)

PH-p-nitroPV

poly(3-hydroxy-p-nitrophenyl valerate)

PH-p5TV

poly(3-hydroxy-p-tolyl valerate)

P(H6MN)

poly(3-hydroxy-6-methylnonanoate)

sclPHA

short chain length poly(3-hydroxyalkanoic acid)

3MB

3-mercaptobutyrate

3MP

3-mercaptopropionate

3MV

3-mercaptovalerate

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© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of ChemistryZonguldak Karaelmas UniversityZonguldakTurkey
  2. 2.Institut für Molekulare Mikrobiologie und BiotechnologieWestfälische Wilhelms–Universität MünsterMünsterGermany

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