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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Natural Products and Resources (IJNPR)
[Formerly Natural Product Radiance (NPR)] >
NPR Vol.4 [2005] >
NPR Vol.4(4) [July-August 2005] >
| Title: | Dye |
| Issue Date: | Aug-2005 |
| Publisher: | CSIR |
| Abstract: | Lac, a natural resin of insect
origin, is used extensively for natural food
additives, cosmetics and as a colorant for
silk and cotton dyeing. Lac dye, which is
the soluble part of stick lac, is composed
mainly of two major anthraquinone-based
components: laccaic acids A and B; the
minor components, laccaic acids C, D and
E, have also been isolated. The UV–VIS
spectrum of laccaic acid A is very similar
to the spectrum of crude laccaic acid in
ethanol, with absorption maxima for
laccaic acid A reported at 290, 340,
500 and 530 nm in this solvent; in
water, λmax values were reported at 292
and 490nm and at 500nm in acetone
for this acid (referred to as laccaic acid. |
| Page(s): | 283 |
| ISSN: | 0975-1092 (Online); 0972-592X (Print) |
| Source: | NPR Vol.4(4) [July-August 2005]
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