Dependences of optical density D on wavelength of incident light λ were obtained. Dependences lg D-lg λ were constructed for model system konjac glucomannan (0.4%): xanthan gum (0.6%): WPI (1%). Measurement of optical density D of model system was carried out immediately after preparation of sample, and also after 2 h, 4 h and 8 h (Fig. 5).