Difference between revisions of "Catechin"
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== Description == | == Description == | ||
| − | The principal yellow colorant in the extracts from the leaves and twigs of | + | The principal yellow colorant in the extracts from the leaves and twigs of [[gambier]], [[Cutch (dye)|Cutch]] and [[kino]] resin. Catechin is a lightfast and washfast color that is used on wool, silk and cotton to obtain a dark brown color. It is used for tanning leather. Catechin is sometimes called by the ambiguous name of catechol, a term that is also used for pyrocatechol. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Soluble in water, ethanol, acetic acid, acetone. Insoluble in benzene, chloroform, ligroin. | + | * Soluble in water, ethanol, acetic acid, acetone. Insoluble in benzene, chloroform, ligroin. |
| + | * Needle crystals from ethanol. | ||
{| class="wikitable" | {| class="wikitable" | ||
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|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 93-96 | + | | 93-96 C |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
Latest revision as of 07:43, 24 May 2022
Description
The principal yellow colorant in the extracts from the leaves and twigs of Gambier, Cutch and Kino resin. Catechin is a lightfast and washfast color that is used on wool, silk and cotton to obtain a dark brown color. It is used for tanning leather. Catechin is sometimes called by the ambiguous name of catechol, a term that is also used for pyrocatechol.
Synonyms and Related Terms
catechinic acid; catechuic acid; catechol (flavan); catecol (Esp.); catechina (It.); catequina (Port.)
Physical and Chemical Properties
- Soluble in water, ethanol, acetic acid, acetone. Insoluble in benzene, chloroform, ligroin.
- Needle crystals from ethanol.
| Composition | C15H14O6 |
|---|---|
| Melting Point | 93-96 C |
| Molecular Weight | mol. wt. = 290.27 |