Pellet diameter and morphology of European Ganoderma pfeifferi in a repeated-batch fermentation for exopolysaccharide production

Supramani, Sugenendran and Jailani, Nurulhuda and Ramarao, Kivaandra and Mohd Zain, Nurul Amalina and Klaus, Anita and Ahmad, Rahayu and Wan-Mohtar, Wan Abd Al Qadr Imad (2019) Pellet diameter and morphology of European Ganoderma pfeifferi in a repeated-batch fermentation for exopolysaccharide production. Biocatalysis and Agricultural Biotechnology, 19. p. 101118. ISSN 1878-8181

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Official URL: https://doi.org/10.1016/j.bcab.2019.101118

Abstract

The pellet diameter and morphology of an underutilized European Ganoderma pfeifferi (EGP) mycelium was studied in a repeated-batch fermentation (RBF) for exopolysaccharide (EPS) production. In preliminary fermentation, growth screening was performed for initial pH, glucose concentration, and agitation speed. At 30 °C, the favourable conditions for EPS production (0.58 g/L) and EPS productivity (0.058 g/L day −1 ) were 15 g/L glucose, initial pH 6, and 100 rpm, while the highest dry cell weight (DCW; 3.63 g/L) was achieved at 9 g/L glucose, initial pH 4, and 120 rpm. Morphologically verified, large, compact pellets (diameter: 40 μm < d < 40.67 μm) were associated with high DCW while small dispersed pellets (diameter: 11.67 μm < d < 14.67 μm) were associated with high EPS production. In RBF, EGP mycelium exhibited the ability to self-immobilize and high stability for repeated use with increasing smooth pellet diameter from RBF1 (7.33 μm < d < 7.67 μm) to RBF4 (16.67 μm < d < 18.33 μm). The fermentation period was subsequently shortened from 48 (batch) to 24 days in four consecutive cycles of RBF, and the productivity of EPS increased from 0.053 g/L day −1 to 0.108 g/L day −1 . In an FTIR analysis, crude EPS of EGP showed the presence of β-glucan characteristics at 1075 cm −1 and 891 cm −1 wavelengths, similar with European G. lucidum BCCM 31549. In addition, 1 H NMR showed similar β-glycosidic linkages when compared with laminarin standard. The proposed strategy demonstrated that G. pfeifferi pellet morphology can withstand extended fermentation cycles for efficient EPS production. © 2019 Elsevier Ltd

Item Type: Article
Uncontrolled Keywords: Ganoderma pfeifferi; Pellet morphology; Pellet diameter; Exopolysaccharide; β-glucan; Repeated-batch fermentation
Subjects: Q Science > Q Science (General)
Q Science > QR Microbiology
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 09 Jan 2020 01:04
Last Modified: 09 Jan 2020 01:04
URI: http://eprints.um.edu.my/id/eprint/23360

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