Malaysian Applied Biology Journal

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47_05_20

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Malays. Appl. Biol. (2018) 47(5): 165–172

 

ENHANCED SUGAR RECOVERY FROM OIL PALM TRUNK

BIOMASS BY REPEATED ENZYMATIC HYDROLYSIS WITH

SURFACTANT ADDITION


NURUL ADELA BUKHARI1,2*, SOH KHEANG LOH2, NASRIN ABU BAKAR2

and JAMALIAH MD JAHIM1,3


1Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment,

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor

2Energy & Environment Unit, Engineering & Processing Research Division,

Malaysian Palm Oil Board (MPOB), 6, Persiaran Institusi,

Bandar Baru Bangi, 43000 Kajang, Selangor

3Centre for Sustainable Process Technology, Faculty of Engineering and Built Environment,

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


Accepted 12 October 2018, Published online 30 November 2018


ABSTRACT

In bioconversion, low sugar recovery is often faced during enzymatic hydrolysis process of agro-industrial biomass due to their complex crystalline structures. However, high enzyme loadings make large-scale processing economically unfeasible. Addition of surfactants to enzymatic hydrolysis has been found to enhance the conversion of cellulose to sugar. In this study, we have attempted to enhance sugar recovery from oil palm trunk biomass (OPTB) by investigating the co-existence of surfactants in the enzyme employed. The study revealed that addition of non-ionic surfactant i.e. Triton X-100 at 0.1% (v/v) facilitated hydrolysis and improved the sugar recovery from the pretreated OPTB by 2-fold within 48 hr. In addition, a repeated enzymatic hydrolysis (REH) was employed where the hydrolysate from the initial process was recycled and reused for subsequent cycle. From the two-cycle of REH, a total recovered sugar of 36.9±0.8 g/L (72.6% yield) was obtained within 96 hr, while the three-cycle REH recovered 55.1±1.7 g/L total sugar (72.2% yield) within a shorter reaction time of 72 hr. Recycling and reusing the hydrolysate combined with supplementing surfactant has reduced the enzyme usage by half, thereby resulted in substantial savings for improved process feasibility.

Key words: Enzymatic saccharification, oil palm trunk, fermentable sugar, lignocellulosic biomass, Triton X-100

 

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