alexa Identification of Bacteria that Contribute to IMP Degradation in Horse Mackerel
ISSN: 2157-7110

Journal of Food Processing & Technology
Open Access

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Research Article

Identification of Bacteria that Contribute to IMP Degradation in Horse Mackerel

Hiroko Seki and Naoko Hamada-Sato*

Course of Safety Management in Food Supply Chain, Tokyo University of Marine Science and Technology, Tokyo, Japan

*Corresponding Author:
Naoko Hamada-Sato
Course of Safety Management in Food Supply Chain Tokyo University of Marine Science and Technology
4-5-7, Konan, Minato-ku, Tokyo, 108-8477, Japan
Tel: +81-3-5463-0389
Fax: +81-3-5463-0389
E-mail: [email protected]

Received date: August 01, 2014; Accepted date: September 04, 2014; Published date: September 11, 2014

Citation: Seki H, Hamada-Sato N (2014) Identification of Bacteria that Contribute to Imp Degradation in Horse Mackerel. J Food Process Technol 5:363. doi: 10.4172/2157-7110.1000363

Copyright: © 2014 Seki H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



Inosinic acid (inosine monophosphate, or IMP) is a taste component of fish that is broken down by an IMP-degrading enzyme (IMPase), impacting flavor. To measure IMPase activity, the enzyme is extracted as a solution from homogenized fish flesh, the IMP is then degraded by the enzyme, and the production of phosphoric acid from IMP is quantified. However, the degradation of IMP by bacteria that can be present in fish muscle could potentially affect the quantitation of endogenous IMPase activity. In this study, we isolated two bacterial strains from the enzyme solution obtained from horse mackerel and investigated their ability to degrade IMP. The isolates were identified as Pseudomonas fragi and either Pseudomonas veronii or Pseudomonas extremaustralis, as determined by 16S rDNA analysis. Of the two isolates, only P. fragi was found to be able to degrade IMP. Furthermore, the influence of the bacteria on the detection of IMPase activity was only seen when the reaction time was extended beyond 24 h.


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