Journal Textile Coloration and Finishing Year / Vol., Issue, Month 2018 / V.30,no.2,Jun Title Control of Molecular Weight and Terminal Groups of Poly (3-hydroxybutyrate) in Bio-synthesis Authors Chan Woo Lee Institution/Affiliations Hoseo University Pages/Total page pp.130 ~ 140 / 11 Language Korean Abstract Abstract In the bio-synthesis of poly(3-hydroxybutyrate)(PHB), which is a kind of poly(3-hydroxyalkanoate)(PHA), aimed to control the low molecular weight of PHB and obtain a telechelic PHB. As a result of incubation of R. eutropha at 30℃ with ethylene glycol added as a chain transfer agent, PHB content on the dry cell weight increased up to 24h, however, it decreased after that, and the molecular weight of PHB increased from 9h to 12h, and then, decreased up to 72h. The decrease of the content and the molecular weight of PHB indicates that PHB was decomposed as an energy source in bacterial cells and was incorporated into metabolic pathways. 1H-NMR of the obtained PHB after incubation for 72h was measured to determine the terminal groups of the PHB during incubation. As the results of １H-NMR measurement, the peaks derived from ethylene glycol in both terminals of PHB were observed. Which indicate that the terminal reaction was caused by the addition of ethylene glycol, and that telechelic PHB having hydroxyl group at the both terminals where molecular weight was controlled was successfully synthesized. Keywords Keywords bio-synthesis, low molecular weight, terminal groups, telechelic, poly(3-hydroxybutyrate), energy source, chain transfer agent Download   Reference http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=OSGGBT_2018_v30n2_130&ordernum=