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Comonomer composition distribution of P(3HB‐ co ‐3HP)s produced by Alcaligenes latus at several pH conditions
Author(s) -
Wang Yi,
Ichikawa Masafumi,
Cao Amin,
Yoshie Naoko,
Inoue Yoshio
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990501)200:5<1047::aid-macp1047>3.0.co;2-a
Subject(s) - copolyester , comonomer , chemistry , chloroform , fermentation , composition (language) , solvent , heptane , malic acid , nuclear chemistry , polymer chemistry , organic chemistry , polymer , copolymer , polyester , linguistics , philosophy , citric acid
A series of poly(3‐hydroxybutyric acid‐ co ‐3‐hydroxypropionic acid) (P(3HB‐ co ‐3HP)) samples was biosynthesized by fermentation with Alcaligenes latus using sucrose/3‐hydroxypropionic acid as carbon source at different pH conditions from 6.0 to 8.0. The copolymers were compositionally fractionated using the mixed solvent chloroform/heptane. It was found that A. latus produces P(3HB‐ co ‐3HP)s with different 3HP content under the same conditions except for the pH value of the medium. The higher the pH value of the fermentation medium is, the less 3HP units are introduced into the copolyester. The comonomer composition distribution for the copolyesters also depends on the pH value of medium. The copolyester sample produced at pH 6.0 has a much broader composition distribution than those produced at pH values between 6.5 and 8.0. The copolyester with the narrowest distribution was obtained at pH 7.0. It was also found that the distribution becomes broader with increasing fermentation time.