Abstract
The oxidoreduction potential (E h) is of growing interest in dairy research and the dairy industry. Lactic acid bacteria are able to decrease the E h to considerable reducing values, and it is an important feature of the technological characteristics of lactic starters and probiotics. Reducing E h is also necessary for the development of the characteristic flavour of certain fermented dairy products such as cheeses. Moreover, data comparisons and interpretations are often difficult due to an absence of standardised expression of the results. The objective of this work was to propose a complete procedure for the use of combined and half-cell platinum (Pt) sensors to obtain stable, repeatable and reproducible E h measurements and to standardise data. Three measurement systems, each made up of a sensor, cable and interface, were compared in tap water. A control chart was used to calculate a confidence interval (CI = 20 mV) to verify whether the process was under control. This complete procedure was then applied to the measurement of E h in milk samples to characterise both pure strains of lactic acid bacteria and complex mixed starters, to study the impact of a process parameter (oxygen) on starter activity, to follow E h during cheese making and to measure E h gradients in cheeses. This manuscript presents a procedure for the measurement of E h as well as the feasibility and interest of this procedure in the dairy chain.
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Acknowledgments
The authors wish to thank Mr Nicolas Adami (Mettler-Toledo) for his comments on this manuscript. The thesis of Cécile Aubert was supported by a research grant from the ANRT. The thesis of Sophie Abraham was supported by research grants from INRA, the Regional Council of Burgundy (Dijon, France) and the Regional Council of Franche-Comté (Besançon, France). The authors are grateful to Gaby Duboz and Francis Faurie (INRA-URTAL, Poligny, France) for making the cheeses in the pilot plant and also to César Grandvoynet for his technical help. The thesis of Damien Michelon was supported by a EUREKA research grant (Σ!3562-Labredox). The thesis of Bruno Ebel was supported by research grants from Senoble (Jouy, France), the ANRT (Paris, France) and the FUI Probiotique, supported by Vitagora. This work was partly supported by a research grant from ANR (Food-Redox project), supported by Vitagora (Dijon, France) and Valorial (Rennes, France).
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Abraham, S., Cachon, R., Jeanson, S. et al. A procedure for reproducible measurement of redox potential (E h) in dairy processes. Dairy Sci. & Technol. 93, 675–690 (2013). https://doi.org/10.1007/s13594-013-0134-5
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DOI: https://doi.org/10.1007/s13594-013-0134-5