CONVENIENT ESTERIFICATION OF POLY(GAMMA-GLUTAMIC ACID) PRODUCED BY MICROORGANISM WITH ALKYL-HALIDES AND THEIR THERMAL-PROPERTIES

被引：45

作者：

KUBOTA, H ^{[1
]}

NAMBU, Y ^{[1
]}

ENDO, T ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,NAGATSUTA CHO 4259,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 1995年 / 33卷 / 01期

关键词：

POLY(GAMMA-GLUTAMIC ACID); ESTERIFICATION; THERMAL PROPERTIES; BIOPOLYMER;

D O I：

10.1002/pola.1995.080330110

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The esterification of poly(gamma-glutamic acid) (gamma-PGA) produced by Bacillus subtilis F2-01 with alkyl halides was carried out at 60-degrees-C in N-methyl-2-pyrrolidinone (NMP) in the presence of sodium bicarbonate to obtain the corresponding esterified gamma-PGA. The thermal properties of these gamma-PGA esters were examined by differential scanning calorimetry and thermogravimetry. gamma-PGA esters were more stable than free acid type gamma-PGA, which decomposed at 210-degrees-C. Melting temperature (T(m)) of gamma-PGA esters could be observed at 230-250-degrees-C. T(m) of gamma-PGA n-alkyl esters reached a maximum at an alklyl chain length of n = 3. (C) 1995 John Wiley & Sons, Inc.

引用

页码：85 / 88

页数：4

共 9 条

[1] CHARACTERIZATION OF STRUCTURAL COMPONENT OF CELL-WALLS OF ALKALOPHILIC STRAIN OF BACILLUS SP C-125 - PREPARATION OF POLY(GAMMA-L-GLUTAMATE) FROM CELL-WALL COMPONENT [J].