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Rapid Evaluation of Surface Sanitation by Electrical Measurement

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Electrical measurements are easier and faster than traditional methods for evaluating surface sanitation in the food industry. However, the behavior of sublethally damaged bacteria is different in each method. The electrical method is more sensitive to the presence of disinfectant traces in the samples. These issues lead to low correlations between both methods (r2 < 0.7). The use of smaller sample volumes in electrical measurements, together with the addition of a blend of neutralizers to the sample and the subsequent removal by filtration, provide r2 values >0.9. The developed protocol shows an excellent correlation with traditional methods and facilitates the adaptation of the electrical method to routine monitoring of surface sanitation. It allows for a reduction in holding times and thereby provides the necessary time to make decisions.

Document Type: Research Article

Affiliations: 1: Universidad de La Rioja, Departamento de Agricultura y Alimentación, C/Madre de Dios, 51, 26006 Logroño, Spain. 2: Departamento de Ciencia Animal y de los Alimentos, Facultad de Veterinaria, Universidad Autónoma de Barcelona, 08193 Bellaterra (Barcelona), Spain.

Publication date: July 1, 2005

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 The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better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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