서지주요정보
효소, 곰팡이 및 토양에 의한 Poly(ε-caprolactone)과 Poly(ethylene terephthalate)의 분해성 평가 = Degradation of poly(ε-caprolactone) and poly(ethylene terephthalate) by enzyme, fungi, and soil burial
서명 / 저자 효소, 곰팡이 및 토양에 의한 Poly(ε-caprolactone)과 Poly(ethylene terephthalate)의 분해성 평가 = Degradation of poly(ε-caprolactone) and poly(ethylene terephthalate) by enzyme, fungi, and soil burial / 김연철.
저자명 김연철 ; Kim, Yeon-Chul
발행사항 [대전 : 한국과학기술원, 1993].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8003855

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 93003

휴대폰 전송

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반납예정일

초록정보

The enzymatic degradation of polycaprolactone (PCL) using lipases obtained from different microorganisms was investigated by measuring weight loss and total organic carbon (TOC) concentration. Lipase from Pseudomonas sp. was able to degrade PCL most efficiently. In this study, three major variables, enzyme concentration, substrate concentration, and reaction time, were optimized to enhance biodegradation of PCL. The optimal condition of biodegradation of PCL was acheived at a substrate concentration of 30 g/L, and enzyme concentration of 30 mg/L, and a degradation time of 15-20 hours. Three different forms of PCL, film, fine powder, and coarse powder, were investigated to understand the effect of surface area on the degradation rate. PCL with large surface area (fine powder) was degraded most efficiently by lipase obtained from Pseudomonas sp. The ASTM G21-70 method was employed to test biodegradability of PCL compared to polythylene terephthalate (PET) by growing Aspergillus miger on salt-agar plate containing these polymers as the sole carbon sources. The amount of polymers degraded by fungi was monitored by photograph or scanning electron microscopy (SEM). The growth of A niger was apparent on the PCL containing plate, but no growth was observed on PET containing plate. Degradation of PCL due to fungal growth was verified by SEM, which clearly shows physical changes on the PCL film surface. In short, PCL was totally biodegraded by the ASTM method, while PET was not. The biodegradation of PCL and PET films under soil burial conditions extending up to 3 months has been investigated. SEM pictures of the surface of the soil-buried samples do not reveal the extent of the microbial attack.

서지기타정보

서지기타정보
청구기호 {MCHE 93003
형태사항 vii, 62 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Yeon-Chul Kim
지도교수의 한글표기 : 장호남
지도교수의 영문표기 : Ho-Nam Chang
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 57-62
주제 Enzymes.
Biodegradation.
효소. --과학기술용어시소러스
생물 분해. --과학기술용어시소러스
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