Oxidation of Various Types of Lac by Periodic acid

Abstract

Seven different types of lac of Rajshahi region were oxidized with

periodic acid. In order to find out the optimum condition of oxidation,

a series of experiments was carried out and the effect of time concentration,

volume of solvent and the quantity of lac were taken into

consideration. Percentage of dihydroxy compound and Periodic acid

from aleuritic acid, hydrolysed shellac, katiki seed lac, dewaxed shellac,

baisaki seed lac, shellac (commercial) and old shellac are (102.50,

368.20), (34.25, 128.79), (15.10, 53.55), (13.95, 50.60), (12.90, 50.29),

(12.69,48.95) respectively.