Evaluation of several ionic liquids for in situ hydrolysis of empty fruit bunches by locally-produced cellulase

Kabbashi, Nassereldeen Ahmed and Alam, Md Zahangir and Elgharbawy, Amal A.M. and Moniruzzaman, Muhammad and Jamal, Parveen (2016) Evaluation of several ionic liquids for in situ hydrolysis of empty fruit bunches by locally-produced cellulase. 3 Biotech, 6 (2). pp. 1-15. ISSN 2190-572X E-ISSN 2190-5738

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Abstract

Lignocellulosic biomasses, exhibit resistance to enzymatic hydrolysis due to the presence of lignin and hemicellulose. Ionic liquids proved their applicability in lignin degradation, however, ionic liquid removal has to be performed to proceed to hydrolysis. Therefore, this study reports an in situ hydrolysis of empty fruit bunches (EFB) that combined an ionic liquid (IL) pretreatment and enzymatic hydrolysis. For enzyme production, palm kernel cake (PKC) was used as the primary media for microbial cellulase (PKC-Cel) from Trichoderma reesei (RUTC30). The obtained enzyme exhibited a promising stability in several ionic liquids. Among few, in choline acetate [Cho]OAc, PKC-Cel retained 63.16 % of the initial activity after 6 h and lost only 10 % of its activity in 10 % IL/buffer mixture. Upon the confirmation of the PKC-Cel stability, EFB was subjected to IL-pretreatment followed by hydrolysis in a single step without further removal of the IL. The findings revealed that choline acetate [Cho]OAc and choline butyrate [Cho]Bu were among the best ILs used in the study since 0.332 +/- 0.05 g glucose/g and 0.565 +/- 0.08 g total reducing sugar/g EFB were obtained after 24 h of enzymatic hydrolysis. Compared to the untreated EFB, the amount of reducing sugar obtained after enzymatic hydrolysis increased by three-fold in the case of [Cho]OAc and [Cho]Bu, two-fold with [EMIM]OAc and phosphate-based ILs whereas the lowest concentration was obtained in [TBPH]OAc. Pretreatment of EFB with [Cho] OAc and [Cho] Bu showed significant differences in the morphology of EFB samples when observed with SEM. Analysis of the lignin, hemicellulose and hemicellulose showed that the total lignin content from the raw EFB was reduced from 37.8 +/- 0.6 to 25.81 +/- 0.35 % (w/w) upon employment of [Cho] OAc in the compatible system. The PKC-Cel from T. reesei (RUTC30) exhibited promising characteristics that need to be investigated further towards a single-step process for bioethanol production.

Item Type:	Article (Journal)
Additional Information:	4157/51015
Uncontrolled Keywords:	Activity; Cellulase; Compatibility ; Ionic liquid; Lignocellulose; Pretreatment Abb
Subjects:	T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	International Institute for Halal Research and Training (INHART) Kulliyyah of Engineering Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Dr Nassereldeen Kabbashi
Date Deposited:	29 Jun 2016 10:20
Last Modified:	01 Apr 2019 11:25
URI:	http://irep.iium.edu.my/id/eprint/51015

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