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Effect of storage and preservation of milk samples on the response of microbial inhibitor tests

Published online by Cambridge University Press:  09 October 2013

Milagro Borràs Llopis ,
Marta Roca Marugón ,
Rafael Lisandro Althaus  and
Maria Pilar Molina Pons
Milagro Borràs Llopis*
Affiliation:
Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de València, Camino de Vera, s/n 46022 Valencia, Spain
Marta Roca Marugón
Affiliation:
Centro Superior de Investigación en Salud Pública, Avd. Cataluña, 21 46020 Valencia, Spain
Rafael Lisandro Althaus
Affiliation:
Cátedra de Biofísica, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral – R.P.L., Kreder 2805, 3080 Esperanza, Argentina
Maria Pilar Molina Pons
Affiliation:
Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de València, Camino de Vera, s/n 46022 Valencia, Spain
*
*For correspondence; e-mail: miborllo@upvnet.upv.es
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Abstract

The aim of this study was to evaluate the effect of storage time (4 °C) on milk samples and the use of azidiol as preservative on the results of microbial inhibitor tests used to detect antimicrobials in milk. For this purpose, 16 milk bulk samples divided into two aliquots, preservative-free and with azidiol, spiked with 12 concentrations of amoxicillin, ampicillin, penicillin G and oxytetracycline, were used. The milk samples were analysed using the BRT MRL, Delvotest MCS Accelerator and Eclipse 100 at 0, 24, 48 and 72 h stored at 4 °C. The logistic regression model was applied to study the effect of storage time (ST), preservative (P) and their interaction (ST×P). At a concentration equivalent to the Detection Limit (DL), the positive results of microbial inhibitor tests do not remain stable during storage time. These results are more reproducible if samples are stored with a preservative. At Maximum Residue Limits (MRLs) concentration microbial inhibitor tests can detect penicillin for up to 72 h of storage. For oxytetracycline, the BRT MRL and Delvotest MCS tests presents DL exceeding the MRL, therefore they are not sensitivity to this tetracycline (0% positive results). By contrast Eclipse 100, whose DL is lower than the MRL, gave 100% positive results during the 72 h storage period. It can be concluded that it would be convenient to store milk samples with azidiol at 4 °C and to carry out analyses within the first 48 h since milk sampling.

Keywords

Microbial inhibitor testsstorageazidiolantibiotics
Type
Research Article
Information
Journal of Dairy Research , Volume 80 , Issue 4 , November 2013 , pp. 475 - 484
Copyright
Copyright © Proprietors of Journal of Dairy Research 2013 

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