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Clarification of apple juices with vegetable proteins monitored by multiple light scattering.

This work proposes a novel approach based on the real-time monitoring of the fining process of apple juices by static multiple light scattering. The change in transmission was used to determine the fining effectiveness of three vegetable proteins, respectively, red lentil, green lentil, and green pea proteins. Further treatment with gelatin-bentonite was used as a control. The modified Gompertz function was applied to fit the transmission signals. According to (1) the rate of flocculation and (2) the rate of sedimentation, the best fining efficiency was achieved by red lentil, which was similar to that of gelatin-bentonite and higher than green lentil and green pea proteins. This ranking was obtained at any dose from 60 to 900 mg per liter of juice. The results suggest the use of red lentil as a potential fining agent for apple juices and highlight the advantages of using static multiple light scattering technique as a quality control tool for studying the kinetics of the fining process. PRACTICAL APPLICATION: The study proposed the use of vegetable proteins as fining agents for apple juices. Their efficiency was ably monitored in real time by static multiple light scattering.