Microbial Production of Ascorbic Acid from Brewery Spent Grain (BSG) by Aspergillus flavus and Aspergillus tamarii

Authors

  • Temitope Temitayo Banjo Federal University of Agriculture, Abeokuta
  • Sarafadeen Olateju Kareem Department of Microbiology, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria
  • Temitope Olukayode Popoola Department of Microbiology, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria
  • Oluseyi Adeboye Akinloye Department of Biochemistry, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria

DOI:

https://doi.org/10.14456/fabj.2018.9

Keywords:

Ascorbic acid, High Performance Liquid Chromatography, Brewery Spent Grain, Aspergillus flavus, Aspergillus tamari

Abstract

This study evaluated the use of Brewery Spent Grain (BSG) as a novel substrate for the production of ascorbic acid using Aspergillus flavus and Aspergillus tamarii. Spores of Aspergillus flavus and Aspergillus tamarii were cultured in a liquid fermentation medium containing BSG (0.6% w/v) for ascorbic acid production. The process was studied at pH 4–8, temperature range 30–45°C, agitation speed range
60–160 rpm for 168 h. Stability studies and the effects of Ethylenediaminetetraacetic Acid (0.5–4.0 g/ml) on ascorbic acid production were studied. Ascorbic acid produced was quantified by titration techniques and with High Performance Liquid Chromatography (HPLC). The statistical analysis of the effects of temperature and agitation speed on ascorbic acid production showed no significant difference at p<0.05. However, there was significant difference in the effect of pH on ascorbic acid production at p<0.05. Optimum ascorbic acid yields of 7.25 g/L and 6.25 g/L were produced by A. tamarii and A. flavus respectively at pH 5.0, temperature (40°C) and agitation speed of 100 rpm at 96 h of fermentation. High Performance Liquid Chromatography (HPLC) showed that 6.248 g/L and 7.246 g/L of ascorbic acid were produced by A. flavus and A. tamarii, respectively. Ascorbic acid production by A. flavus and A. tamarii was completely inhibited at 4 g/ml of EDTA. This study shows the potential of BSG as a novel substrate for ascorbic acid production.

Author Biographies

Temitope Temitayo Banjo, Federal University of Agriculture, Abeokuta

Institute for Human Resources and Development. Lecturer

Sarafadeen Olateju Kareem, Department of Microbiology, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria

Department of Microbiology/ Associate Professor

Temitope Olukayode Popoola, Department of Microbiology, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria

Department of Microbiology/ Professor

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Published

2018-03-06

How to Cite

Banjo, Temitope Temitayo, Sarafadeen Olateju Kareem, Temitope Olukayode Popoola, and Oluseyi Adeboye Akinloye. 2018. “Microbial Production of Ascorbic Acid from Brewery Spent Grain (BSG) by Aspergillus Flavus and Aspergillus Tamarii”. Food and Applied Bioscience Journal 6 (2):93-105. https://doi.org/10.14456/fabj.2018.9.

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Section

Food Processing and Engineering