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A glutamic acid-producing lactic acid bacteria isolated from Malaysian fermented foods


Zareian, Mohsen and Ebrahimpour, Afshin and Abu Bakar, Fatimah and Mohammed, Abdulkarim Sabo and Forghani, Bita and Ab Kadir, Mohd Safuan and Saari, Nazamid (2012) A glutamic acid-producing lactic acid bacteria isolated from Malaysian fermented foods. International Journal of Molecular Sciences, 13 (5). pp. 5482-5497. ISSN 1661-6596; ESSN: 1422-0067


L-glutamaic acid is the principal excitatory neurotransmitter in the brain and an important intermediate in metabolism. In the present study, lactic acid bacteria (218) were isolated from six different fermented foods as potent sources of glutamic acid producers. The presumptive bacteria were tested for their ability to synthesize glutamic acid. Out of the 35 strains showing this capability, strain MNZ was determined as the highest glutamic-acid producer. Identification tests including 16S rRNA gene sequencing and sugar assimilation ability identified the strain MNZ as Lactobacillus plantarum. The characteristics of this microorganism related to its glutamic acid-producing ability, growth rate, glucose consumption and pH profile were studied. Results revealed that glutamic acid was formed inside the cell and excreted into the extracellular medium. Glutamic acid production was found to be growth-associated and glucose significantly enhanced glutamic acid production (1.032 mmol/L) compared to other carbon sources. A concentration of 0.7% ammonium nitrate as a nitrogen source effectively enhanced glutamic acid production. To the best of our knowledge this is the first report of glutamic acid production by lactic acid bacteria. The results of this study can be further applied for developing functional foods enriched in glutamic acid and subsequently γ-amino butyric acid (GABA) as a bioactive compound.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Food Science and Technology
DOI Number: https://doi.org/10.3390/ijms13055482
Publisher: MDPI
Keywords: γ-amino butyric acid; Lactobacillus plantarum; 16S rRNA gene sequencing; Polymerase chain reaction; Phenotypic identification; Sugar assimilation profile
Depositing User: Nabilah Mustapa
Date Deposited: 01 Jun 2020 03:50
Last Modified: 01 Jun 2020 03:50
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms13055482
URI: http://psasir.upm.edu.my/id/eprint/78003
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