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Summary Comparison of refractive index and viscosity evolution during lactic gelification of milk. A coaxial cylinders viscosimeter coupled with a refractometer were used to follow acid gelification of milk with Streptococcus thermophilus (CNRZ 7 and CNRZ 385). The viscosity and the refractive signal (IR) were functions of pH and increased simultaneously at pH 5.4. At pH 5.0, the viscosity decreased rapidly, while the IR still rised. Significant linear regressions between viscosity (restricted to the rising part of the viscosity time curves) and IR were obtained. These results show that the used refractometer could be a satisfactory non-destructive sensor for milk gelification with lactic acid bacteria. Sorne hypothesis are discussed concerning the phenomena followed by the refractometer.

Comparaison de l'évolution de l'indice de réfraction et de la viscosité au cours de la gélification lactique du lait