Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-block-poly(3-hydroxybutyrate) copolymer (P3HBV-b-P3HB) was biosynthesized by addition of pentanoic acid and glucose as carbon sources by Ralstonia eutropha. First, pentanoic acid was metabolized for 72 h to provide P3HBV, and, after changing to a new medium, glucose was used as a second carbon source to give P3HB. In order to regulate the chain length of P3HB, the cultivation time of glucose was varied from 24 to 96 h. The index of randomness of the butyrate and valerate units (D) was estimated based on the resonance line of the carbonyl carbon in the 13C NMR spectrum. The D value was between 3.7 and 9.2 depending on the glucose cultivation time, corresponding to the formation of a block copolymer. The chain lengths of the P3HBV and P3HB blocks were estimated from these values. It was found that as the cultivation time of glucose increased, the chain length of the P3HBV block accumulated at the initial stage decreased, whereas that of the P3HB block increased. This indicates that the P3HBV block was consumed as an energy source for the activity of the microorganism while more of the P3HB block was accumulated, because the end group was active for polymerization.
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.References
Kamiya N, Yamamoto Y, Inoue Y, Chujo R, Doi Y (1989) Macromolecules 22:1676
Holmes PA (1985) Phys Technol 16:32
Doi Y, Tamaki A, Kunioka M, Soga K (1987) J Chem Soc, Chem Commun 1635
Doi Y, Tamaki A, Kunioka M, Soga K (1998) Appl Microbiol Biotechnol 28:330
Mitomo H, Morishiota N, Doi Y (1993) Macromolecules 26:5809
Yoshie N, Menju H, Sato H, Inoue Y (1995) Macromolecules 28:6516
Yoshie N, Fujiwara M, Kasuya K, Abe H, Doi Y, Inoue Y (1993) Macromolecules 26:5809
Yoshie N, Fujiwara M, Kasuya K, Abe H, Doi Y, Inoue Y (1999) Macromol Chem Phys 200:977
De Smet MJ, Eggink G, Withol B, Kingma J, Wynberg H (1983) J Bacteriol 154:870
Lageveen RG, Huisman GW, Preusting H, Ketelaar P, Eggink G, Witholt B (1988) Appl Environ Microbiol 54:2924
Brandl H, Gross RA, Renz RW, Fuller RC (1988) Appl Environ Microbiol 54:1977
Huisman GW, De Leeuw O, Eggink G, Witholt B (1989) Appl Environ Microbiol 55:1949
Haywood GW, Andersen AJ, Dawes EA (1989) Biotechnol Lett 11:471
Miura T, Ishii D, Nakaoki T (2013) J Polym Environ 21:760
Hirt TD, Neuenschwander P, Suter UW (1996) Macromol Chem Phys 197:1609
Hirt TD, Neuenschwander P, Suter UW (1996) Macromol Chem Phys 197:4253
Reeve MS, McCarthy SP, Gross RA (1993) Macromolecules 26:888
Shuai X, Jedlinski Z, Luo Q, Farhod N (2000) Chin J Polym Sci 18:19 (Eng. Ed.)
Kumagai Y, Doi Y (1993) J Environ Polym Degrad 1:81
Li X, Loh XJ, Wang K, He CB, Li J (2005) Biomacromolecules 6:2740
Pederson N, McChallcher CWJ, Snenc F (2006) Biomacromolecules 7:1904
Mantzaris NV, Kelley AS, Daoutidis P, Srienc F (2002) Chem Eng Sci 57:4643
Mantzaris NV, Kelley AS, Srienc F, Daoutidis P (2001) AIChE J 47:727
Li SY, Dong CL, Wang SY, Ye HM, Chen GQ (2011) Appl Microbiol Biotechnol 90:659
Hu D, Chung A-L, Wu L-P, Zhang X, Wu Q, Chen J-C, Chen G-Q (2011) Biomacromolecules 12:3166
Tripathi L, Wu LP, Chen GQ (2012) Microb Cell Fact 11:44
Tappel RC, Kucharski JM, Mastroianni JM, Stipanovic AJ, Nomura CT (2012) C. Biomacromolecules 13:2964
Wang Q, Yang P, Xian M, Liu H, Cao Y, Yang Y, Zhao G, Macro ACS (2013) Letters 2:996
Acknowledgments
This work was partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (No. 24550179). In addition, financial support from a research fund at Ryukoku University is gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Nakaoki, T., Yamagishi, R. & Ishii, D. Biosynthetic Process and Characterization of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-block-poly(3-hydroxybutyrate) by R. eutropha . J Polym Environ 23, 487–492 (2015). https://doi.org/10.1007/s10924-015-0735-6
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10924-015-0735-6