Microbial degradation of poly-(L-lactic acid) oligomers

被引：39

作者：

Karjomaa, S

Suortti, T

Lempiainen, R

Selin, JF

Itavaara, M

机构：

[1] VTT Biotechnol & Food Res, FIN-02044 Espoo, Finland

[2] Neste Corp Technol, FIN-06101 Porvoo, Finland

来源：

POLYMER DEGRADATION AND STABILITY | 1998年 / 59卷 / 1-3期

关键词：

D O I：

10.1016/S0141-3910(97)00204-8

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Biotic and abiotic degradation of poly-(L-lactic acid) (PLLA) oligomers of molecular weight (MW) 260-2880 g mol(-1) has been studied in an aquatic aerobic headspace biodegradation test for six months. Water soluble/dispersable PLLA oligomers (MW 260-550 g mol(-1)) biodegraded at 25 degrees C and at 58 degrees C. Larger, crystalline and hydrophobic oligomers (MW 550-2880 g mol(-1)) biodegraded only at 58 degrees C. Weight-average molecular weights of PLLA-oligomers decreased both during biotic and abiotic degradation, although slightly more during biotic degradation. The surface and inner structures of biotically incubated PLLA oligomers were more porous than those of abiotically degraded oligomers. Thus abiotic hydrolysis of PLLA-structure to lactic acid appears to be an essential, but not the only explanation for its degradation. PLLA polymer chain seems to be cleaved also enzymatically to lactic acid. (C) 1998 Elsevier Science Limited. All rights reserved.

引用

页码：333 / 336

页数：4

共 8 条

[1] SYNTHESIS OF COPOLY(D,L-LACTIC ACID) WITH RELATIVELY LOW-MOLECULAR WEIGHT AND INVITRO DEGRADATION [J].