Universiti Teknologi Malaysia Institutional Repository

Optimization of lipase immobilization on maghemite and its physico-chemical properties

Ariffin, Maryam F. K. and Idris, Ani and Ngadiman, Nor H. A. (2019) Optimization of lipase immobilization on maghemite and its physico-chemical properties. Brazilian Journal of Chemical Engineering, 36 (1). pp. 171-179. ISSN 0104-6632

[img]
Preview
PDF
837kB

Official URL: http://dx.doi.org/10.1590/0104-6632.20190361s20180...

Abstract

Nanomaterial-based biocatalysts have emerged as current carriers suitable for enzyme immobilization. The nano-sized materials provide large surface area for enzyme attachment, thus increasing the probability for its effcient catalyst activity. By using magnetized nanomaterials, enhancement of the downstream processing is evident as it eases the immobilized enzyme separation from the reaction mixture further. Lipase / maghemite composites were prepared by initial maghemite surface modifcation to cater to the needs for biocatalyst attachment. Surface modifcation using chitosan and subsequent cross-linking with glutaraldehyde provide a suitable environment for the enzyme to be immobilized. Optimization of the conditions for lipase immobilization was carried out using a response surface methodology (RSM) experimental design to obtain the precise optimized conditions for the process. Selected process variables involved were chosen and optimized conditions for lipase immobilization were 9 hour incubation time, 55°C incubation temperature and 12 % (v/v) glutaraldehyde content. The optimized immobilized lipase activity was 1.8 U. Characterizations of the on synthesized materials were also performed. The size distribution of maghemite nanomaterials was mainly within the range of 2-3 nm. Thermal properties of the synthesized maghemite was investigated using DSC and TGA analyses and we found that maghemite changes to hematite at 456.3°C. Magnetic properties of both untreated and lipase immobilized maghemite were studied using VSM and both were superparamagnetic nanomaterials with saturation magnetizations of 34.3 and 80.3, respectively.

Item Type:Article
Uncontrolled Keywords:Maghemite, Optimization
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:88411
Deposited By: Widya Wahid
Deposited On:15 Dec 2020 08:06
Last Modified:15 Dec 2020 08:06

Repository Staff Only: item control page