Malaysian Applied Biology Journal

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48_01_34

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Malays. Appl. Biol. (2019) 48(1): 241–249

 

BIOCONVERSION OF COCONUT-RESIDUE TO SOLUBLE

PROTEIN BY Aspergillus awamori

 

AIZAT MOHD-RAZALI1, MARIAM TAIB2, MASOUKI MURNI3 and AZIZ AHMAD2*


1Institue of Medical Science Technology, University Kuala Lumpur,

43000 Kajang, Selangor, Malaysia

2School of Fundamental Sciences, Universiti Malaysia Terengganu,

21030 Kuala Nerus, Terengganu, Malaysia

3Centre for Fundamental and Liberal Education, Universiti Malaysia Terengganu,

21030 Kuala Nerus, Terengganu, Malaysia

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


Accepted 30 January 2019, Published online 20 March 2019

 

ABSTRACT

Protein is the most expensive and important nutrient component in feed formulation. An alternative protein source should be employed to reduce the dependency on fish meal. Limited reports are available regarding the bioconversion of coconut residue derived-carbohydrate to soluble protein. The objective of this study was to determine the soluble protein and amino acid contents of coconut-residue after solid-state-fermentation by Aspergillus awamori. The complete randomised design (CRD) with three parameters; the inoculum-size (10%, 20%, and 30%), incubation temperature (30°C, 35°C and 40°C) and salt concentration (1x, 2x, 3x) were tested. Response surface method (RSM) was used to optimise the fermentation conditions. As a result, fermentation was increased and showed that the soluble protein content of the coconut-residue, to be 1.13-folds higher than the control. RSM analysis displayed that the best fermentation conditions comprised of 21.29% of inoculum size, 34.39°C of incubation temperature and 2.7-times of salt concentration after nine days of fermentation. Essential amino acids namely; histidine, valine, methionine, isoleucine, as well as three non-essential amino acids like the aspartic acid, serine and proline were significantly improved in the fermented coconut-residue. The current findings suggested that fermented coconut residue is a feasible source of protein and amino acids in feed formulation.

Key words: Coconut, protein, fermentation, histidine, methionine, threonine

 

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