Auramine - Auramine (English spelling)

Japanese: オーラミン - おーらみん(英語表記)auramine
Auramine - Auramine (English spelling)

A yellow basic dye of the diphenylmethane family. It is synthesized by heating 4,4'-bisdimethylaminodiphenylmethane with sulfur, ammonium chloride, and sodium chloride in an ammonia stream at about 200°C. It can dye various fibers, wood, leather, paper, etc. yellow. It has strong coloring power, but its drawbacks are low light resistance and that it hydrolyzes to Michler's ketone when heated to 70°C in water. It is produced in large quantities because it is inexpensive. It was once used to color pickled radish, but its use as a food coloring is now prohibited due to its toxicity. The product name is Auramine O. Auramine G is a methyl derivative of auramine, and is slightly greener than auramine.

[Tobita Mitsuhiko]

[Reference] | Basic dyes | Carbonium ion dyes
The structure of auramine
©Shogakukan ">

The structure of auramine


Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

ジフェニルメタン系の黄色塩基性染料。4,4'-ビスジメチルアミノジフェニルメタンを硫黄(いおう)、塩化アンモニウム、塩化ナトリウムとアンモニア気流下で約200℃に加熱して合成される。各種繊維や、木、革、紙などを黄色に染色できる。着色力は強いが、耐光性が低いこと、水中で70℃に加熱するとミヒラーケトンに加水分解することが欠点である。安価であるので多量に生産されている。沢庵(たくあん)の着色に用いられることもあったが、毒性のあるところから現在では食品用色素としての使用は禁止されている。商品名はオーラミンOである。オーラミンGはオーラミンのメチル誘導体で、オーラミンよりもやや緑みがある。

[飛田満彦]

[参照項目] | 塩基性染料 | カルボニウムイオン染料
オーラミンの構造
©Shogakukan">

オーラミンの構造


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