Study of light-scattering properties of protein-containing microparticles with a small difference in refractive indices

The refractive indices of fodder yeast grown on oil paraffins (paprin) and natural gas (gaprin) were measured by phase microscopy. The scattering matrices of aqueous suspensions of paprin and gaprin are calculated within the framework of the model of spherically symmetric particles. The possibility of identifying the suspensions by their scattering matrices is analyzed for a small difference in the real parts of the refractive index. Experimental measurements of the light scattering matrices show that in the region of small values of the size parameter (≈ 1) the identification of paprin and gaprin can be based only on the difference in the shapes of the particles, and the difference in the refractive indices is manifested for the values of the size parameter greater than 3.