Vital parameters for high gamma-aminobutyric acid (GABA) production by an industrial soy sauce koji Aspergillus oryzae NSK in submerged-liquid fermentation

Wan-Mohtar, Wan Abd Al Qadr Imad and Ab Kadir, Safuan and Lim, Sarina Abdul Halim and Ilham, Zul and Hajar-Azhari, Siti and Saari, Nazamid (2019) Vital parameters for high gamma-aminobutyric acid (GABA) production by an industrial soy sauce koji Aspergillus oryzae NSK in submerged-liquid fermentation. Food Science and Biotechnology, 28 (6). pp. 1747-1757. ISSN 1226-7708

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Official URL: https://doi.org/10.1007/s10068-019-00602-y

Abstract

In submerged-liquid fermentation, seven key parameters were assessed using one-factor-at-a-time to obtain the highest GABA yield using an industrial soy sauce koji Aspergillus oryzae strain NSK (AOSNSK). AOSNSK generated maximum GABA at 30 °C (194 mg/L) and initial pH 5 (231 mg/L), thus was able to utilize sucrose (327 mg/L of GABA) for carbon source. Sucrose at 100 g/L, improved GABA production at 646 mg/L. Single nitrogen sources failed to improve GABA production, however a combination of yeast extract (YE) and glutamic acid (GA) improved GABA at 646.78 mg/L. Carbon-to-nitrogen ratio (C8:N3) produced the highest cell (24.01 g/L) and GABA at a minimal time of 216 h. The key parameters of 30 °C, initial pH 5, 100 g/L of sucrose, combination YE and GA, and C8:N3 generated the highest GABA (3278.31 mg/L) in a koji fermentation. AOSNSK promisingly showed for the development of a new GABA-rich soy sauce. © 2019, The Korean Society of Food Science and Technology.

Item Type: Article
Uncontrolled Keywords: Aspergillus oryzae; GABA-enriched foods; Gamma-aminobutyric acid (GABA); Glutamic acid; Soy sauce koji
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 04 Jan 2019 07:57
Last Modified: 02 Dec 2019 06:26
URI: http://eprints.um.edu.my/id/eprint/19903

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