Preparation of melanin from silkworm wastes and studying its physical and chemical characteristics

The paper presents a scheme for preparation of melanin from silkworm wastes and studies of its physicochemical characteristics and individual composition. The optimal conditions for the isolation of melanin from silkworm wastes, providing the maximum yield of the target product, have been established. It has been established that the main substance of melanin isolated from silkworm wastes is 5,6-dioxiindole homopolymers. The black dry substance, the content of the target product with an average molecular weight of 58300 ± 112 and a density of 1.0 g/cm3 is 96-98 %. The maximum molar absorption is observed at a wavelength of 555 nm, it is well soluble in water, oils and organic solvents.

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