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Lipase immobilization on fibers grafted with polyglycidyl methachrylate

Alkhatib, Ma'an Fahmi Rashid and Bahrudin, Nik Adlin and Mohd. Salleh, Hamzah and Nasef, Mohamed Mahmoud and TING, TEO M. (2019) Lipase immobilization on fibers grafted with polyglycidyl methachrylate. IIUM Engineering Journal, 20 (1). pp. 12-23. ISSN 1511-788X E-ISSN 2289-7860

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Abstract

Lipase enzyme originated from wheat germ was immobilized on nylon -6- grafted with polyglycidyl methachrylate (PGMA). The immobilization of enzyme experiments were designed and studied using face centred central composite design (FCCCD) under response surface methodology (RSM). Prior to immobilization, the polymer was activated with diethyl amine/ethanol to introduce amine functional group to facilitate covalent bonding with the enzyme. The immobilized and free enzymes were characterized for effect of temperature and pH on enzyme activity, stability, storage and reusability as well as kinetics studies. ANOVA revealed that optimum lipase activity of 0.287 U/ml was achieved at immobilization time of 5 h, pH of 6 and 1.0 mg/ml for enzyme concentration. The optimum temperatures and pH for immobilized and free enzymes were 45 °C and 35 °C, and 8 and 7, respectively. The immobilized enzyme showed higher stability compared to free enzyme. The immobilized enzyme retained 18% of its activity after being recycled for 8 times. In storage stability test, immobilized lipase was able to retain 70% of its activity after being stored for 30 days, while free enzyme activity dropped to 15 % after 20 days of storage.

Item Type: Article (Journal)
Additional Information: 5595/69239
Uncontrolled Keywords: Immobilization, enzyme, lipase, optimization, FCCCD, RSM, fibers, nylon, stability, reusability, kinetics study
Subjects: T Technology > TP Chemical technology > TP155 Chemical engineering
T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Dr. Ma'an Alkhatib
Date Deposited: 19 Feb 2019 16:45
Last Modified: 25 Nov 2019 00:26
URI: http://irep.iium.edu.my/id/eprint/69239

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