Modification of Niven's medium for the enumeration of histamine-forming bacteria and discussion of the parameters associated with its use

Journal of Food Protection
Panagiotis Mavromatis, Peter C Quantick

Abstract

The objective of this study was to improve Niven's medium (NM) for the optimized enumeration of histamine-forming bacteria (HFB). The parameters modified related to solidification of the agar at low pH values (pH 5.3 to 5.8), incubation time (24, 48, and 72 h) and temperature (30 and 37 degrees C), number of colonies developed on the plate to allow enumeration of HFB, and color differentiation. Strains of HFB, Morganella morganii, Klebsiella pneumoniae, and Hafnia alvei were examined for their ability to change color on NM. The three microorganisms produced different colors on the medium, which can be used for preliminary identification of HFB. Quantitative analysis of HFB proved to be achievable, with the prerequisite that only 1 to 80 colonies developed on the medium allow effective enumeration. A larger number of colonies results in color development throughout the medium, making the distinction between HFB and other bacteria unachievable. Growth of prolific HFB was noticeably better at pH values from 5.3 to 5.5, compared to 6.3, on NM. Growth at 5.3 and 5.5 on NM also presented a significant advantage in comparison to growth on plate count agar (PCA; pH 7) at the same incubation temperature. The increased agar concentration...Continue Reading

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Citations

Apr 30, 2015·Journal of Food Science·Kristin Bjornsdottir-ButlerPatricia D McClellan-Green
Sep 26, 2009·Journal of Food Protection·Kristin BjornsdottirDavid P Green
Jan 7, 2014·Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan·Ryota HayakawaEmiko Araki
Aug 30, 2008·Critical Reviews in Food Science and Nutrition·José María LandeteRosario Muñoz
Sep 3, 2013·Journal of Food Protection·Elena EnacheKristin Bjornsdottir-Butler
Dec 5, 2017·Annals of Dermatology·Bo Young ChungChun Wook Park
May 29, 2020·Journal of Food Protection·Nobuyuki TanahashiTakayoshi Hirota
Jan 19, 2012·Journal of Food Science·Chiara FerrarioM Grazia Fortina
Jan 29, 2021·Comprehensive Reviews in Food Science and Food Safety·Marta MonienteLaura Botello-Morte
Apr 16, 2010·International Journal of Food Microbiology·Kristin Björnsdóttir-ButlerDavid P Green

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