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Rapid Impedance Method for Predicting the Potential Shelf Life of Packaged Pasteurized Milk

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Abstract:

The potential shelf life of packaged pasteurized milk was studied using a rapid impedance method. The results showed a high correlation between the shelf life of Fengxing and Xiang Man-lou pasteurized milks and between the detection time and the logarithm of colony-forming units per milliliter. The impedance detection time was measured after preliminary incubation at 30°C for 6 h for 100 and 200 μL milk samples, or at 37°C for 6 h for 100–400 μL milk samples for Fengxing pasteurized milk, and after 6 h preliminary incubation at 30°C for 300 and 400 μL milk samples or6hat37°C for 100–400 μL milk samples for Xiang Man-lou pasteurized milk. Regressive equations were then constructed to predict the potential shelf life. Compared with the traditional method, the impedance method plus pre-incubation of milk at elevated temperatures (30 and 37°C) was rapid, accurate, and convenient. The entire estimation process was completed within 11–14 and 14–20 h for Fengxing and Xiang Man-lou pasteurized milks, respectively.

Document Type: Research Article

Affiliations: Food Inspection Laboratory of Guangzhou Entry-Exit Inspection & Quarantine Bureau, Guangzhou, China 510623

Publication date: September 1, 2003

More about this publication?
  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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