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.
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页码：85 / 88
页数：4
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