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Journal of Zhejiang University SCIENCE B 2007 Vol.8 No.8 P.549~554

http://doi.org/10.1631/jzus.2007.B0549


A rapid and accurate 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide colorimetric assay for quantification of bacteriocins with nisin as an example


Author(s):  WANG Fang, CAO Li-ting, HU Song-hua

Affiliation(s):  Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310029, China

Corresponding email(s):   Songhua@zju.edu.cn

Key Words:  MTT colorimetric assay, Nisin, Micrococcus luteus


WANG Fang, CAO Li-ting, HU Song-hua. A rapid and accurate 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide colorimetric assay for quantification of bacteriocins with nisin as an example[J]. Journal of Zhejiang University Science B, 2007, 8(8): 549~554.

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author="WANG Fang, CAO Li-ting, HU Song-hua",
journal="Journal of Zhejiang University Science B",
volume="8",
number="8",
pages="549~554",
year="2007",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2007.B0549"
}

%0 Journal Article
%T A rapid and accurate 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide colorimetric assay for quantification of bacteriocins with nisin as an example
%A WANG Fang
%A CAO Li-ting
%A HU Song-hua
%J Journal of Zhejiang University SCIENCE B
%V 8
%N 8
%P 549~554
%@ 1673-1581
%D 2007
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.B0549

TY - JOUR
T1 - A rapid and accurate 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide colorimetric assay for quantification of bacteriocins with nisin as an example
A1 - WANG Fang
A1 - CAO Li-ting
A1 - HU Song-hua
J0 - Journal of Zhejiang University Science B
VL - 8
IS - 8
SP - 549
EP - 554
%@ 1673-1581
Y1 - 2007
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2007.B0549


Abstract: 
The objective of this study is to propose a more accurate and faster MTT [3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide] colorimetric assay (MCA) for quantitative measurement of polypeptide bacteriocins in solutions with nisin as an example. After an initial incubation of nisin and indicator bacterium Micrococcus luteus NCIB 8166 in tubes, MTT was added for another incubation period. After that, nisin was quantified by estimating the number of viable bacteria based on measuring the amount of purple formazan produced by cleavage of yellow tetrazolium salt MTT. Then MCA was compared to a standard agar diffusion assay (ADA). The results suggested a high correlation coefficient (r2=0.975±0.004) between optical density (OD) and the inhibitory effect of nisin on a bacterial strain Micrococcus luteus NCIB 8166 at a range of 0.125~32 IU/ml. The MCA described in this study was very quick. Quantification of nisin took only 7~8 h and the detection limit was at the level of 0.125 IU/ml when compared to 12 IU/ml and 24~28 h for ADA. The MCA provides an accurate and rapid method for quantification of nisin in solutions and is expected to be used for quantification of other antimicrobial substances.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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