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The measurement of percent solids in soymilk was compared by three methods: light scattering, refractive index, and hydrometry. Soymilks were prepared from Vinton, Amsoy 71, and Weber variety soybeans by grinding the hydrated soybeans in (A) 20-25°C water, (B) 100°C water, and holding the slurry temperature above 90°C for 10 min or (C) soaking the soybeans in 45°C 15% ethanol solution for 12 hr and grinding in 20-25° water. Hydrometer readings at 80-90°C showed no correlation with soymilk percent solids. Light scattering was found more accurate at measuring percent solids compared with refractive index. Significant differences were found between the standard curves of percent solids vs light scattering due to the variety of soybeans and the processing conditions.
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Johnson et al. (1984) studied this question.
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