xanthin
n . 黃色色素
黃色色素
Xanthin \
Xan "
thin \,
n . [
Gr .
xanqo `
s yellow .]
1 .
same as {
xanthine }.
[
1913 Webster ]
2 . (
Chem .)
A yellow insoluble coloring matter extracted from yellow flowers ;
specifically ,
the coloring matter of madder . [
Formerly written also {
xanthein }.]
[
1913 Webster ]
3 . (
Chem .)
One of the gaseous or volatile decomposition products of the xanthates ,
and probably identical with carbon disulphide . [
Obs .]
[
1913 Webster ]
Xanthine
Xanthine \
Xan "
thine \,
n .
Also Xanthin \
Xan "
thin \ . [
Gr .
xanqo `
s yellow .] (
Physiol .
Chem .)
A type of purine obtainable as a white microcrystalline powder , {
C5H4O2N4 },
present in muscle tissue ,
in the liver ,
spleen ,
pancreas ,
and other organs ,
and also in urine (
in small quantities )
and some urinary calculi ,
and in the juices of certain plants ; --
so called because it leaves a yellow residue when evaporated to dryness with nitric acid .
It is also present in guano .
Xanthine is closely related to uric acid .
[
Webster 1913 Suppl .]
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