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Improved method for quantification of the bacteriocin nisin

C E Wolf¹, W R Gibbons

¹Biology-Microbiology Department, South Dakota State University, Brookings 57007, USA.

The Journal of Applied Bacteriology

|April 1, 1996

Summary

This study enhanced nisin quantification in food using an improved agar diffusion bioassay. The modified method increases sensitivity, accuracy, and precision for reliable nisin detection.

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Area of Science:

Food Microbiology
Analytical Chemistry
Bacteriocin Research

Background:

Nisin, a bacteriocin from Lactococcus lactis subsp. lactis, is utilized for food preservation.
Nisin exhibits inhibitory effects against Gram-positive bacteria and their spores.
Accurate quantification of nisin in food samples is crucial for quality control.

Purpose of the Study:

To enhance the sensitivity, accuracy, and precision of the agar diffusion bioassay for nisin quantification.
To optimize assay conditions for more reliable nisin detection in food matrices.

Main Methods:

Modification of the standard agar diffusion bioassay for nisin quantification.
Evaluation of various parameters including indicator organism, agar concentration, and buffering agent.
Utilized Micrococcus luteus as the indicator organism and incorporated 1% Na2HPO4 buffer.

Main Results:

Micrococcus luteus demonstrated the highest sensitivity as an indicator organism.
A reduced agar concentration (0.75%) significantly increased assay sensitivity by 21%.
Incorporation of 1% Na2HPO4 buffer prevented false inhibitory zones due to low pH, improving accuracy by 57% and precision by 12%.

Conclusions:

The modified agar diffusion bioassay offers superior performance for nisin quantification compared to the standard method.
Optimized conditions, including specific indicator organism, agar concentration, and buffering, lead to more reliable nisin analysis.
This enhanced method provides a valuable tool for accurate nisin assessment in food preservation applications.

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