Method for de-coloring shellac, de-colored shellac, compositions comprising same, and uses therefor

摘要

A method for producing de-colored shellac by dissolving colored shellac in an aqueous solution comprising an alkaline agent; contacting the colored shellac in the aqueous solution with a sufficient amount of a chlorite salt to achieve de-coloration of the shellac; precipitating the de-colored shellac by neutralizing the aqueous solution with an acid; and recovering the precipitated de-colored shellac from said aqueous solution. The de-colored shellac produced is non-toxic and suitable for human use. Dental compositions comprising the de-colored shellac are disclosed, as well as uses of the de-colored shellac as a food product coating, a nail polish or varnish, and a wood varnish.

主权项

1. A method of producing a de-colored shellac composition comprising:
(a) heating and dissolving colored shellac in an aqueous solution comprising an alkaline agent; (b) contacting said colored shellac in said aqueous solution with a sufficient amount of a chlorite salt to de-color said colored shellac; (c) precipitating said de-colored shellac by neutralizing the aqueous solution in (b) with an acid; and (d) recovering said precipitated de-colored shellac from said aqueous solution, thereby de-coloring said colored shellac; and (e) adding an additive during and/or after (a), (b), (c), and/or (d), wherein said additive is selected from: an organic additive; metallic oxide nanoparticles; an anti-caries agent; a flavor or odor improving agent; and any combination thereof.