purpurin

The alkylation and acylation for hydroxyl group linked with nitrogen were accomplished to give N alkoxy and N acyloxy purpurin 18 imides , respectively .

对其羟基进行烷基化和酰基化，合成出N取代红紫素18酰亚胺衍生物。

The oxidized products were reacted with hydroxylamine hydrochloride to generate purpurin 18 imide by ammonolysis and recondensation .

所得氧化产物进而和盐酸羟胺反应，经胺解开环和再缩合成环构成N羟基红紫素18酰亚胺衍生物；

The key points for extraction of natural edible purpurin and blue pigment are described .

本文详述了天然食用紫色素和蓝色素的提取技术和操作要点。

Synthesis and Biological Activities of Copper Purpurin 18

铜紫红素-18的合成及其保肝抗溃疡活性的初步研究

Extraction Of Natural Edible Purpurin And Blue Pigment

贵重天然食用色素&紫色素和蓝色素的提取技术

Methods : Purpurin 18 methyl ester is obtained through acidic degradation and alkaline oxidation using chlorophyll a.

方法：叶绿素a通过酸碱降解反应、甲基化反应生成紫红素18甲基酯，然后通过氧化剂对C17-18脱氢，合成具有卟吩结构的原卟啉化合物。

Spectrophotometric Determination of erythromycin Ethylsuccinate based on the charge transfer reaction between erythromycin Ethylsuccinate and purpurin

琥乙红霉素与紫色素的荷移反应及其测定

A spectrophotometric method for the determination of roxithromycin has been developed based on the charge transfer reaction between roxithromycin as donor and purpurin as acceptor .

建立了一种测定罗红霉素的方便而快捷的荷移分光光度法。罗红霉素与紫色素在乙醇介质中发生电荷转移反应，荷移络合物在544nm处有最大吸收；

Strains of Streptomyces belong to eight groups : Grey cinnamonic is the dominant groups and Isolation frequency reached 91.35 % , Followed by the gray purpurin groups and Isolation frequency reached 82.15 % .

链霉菌分离到8个类群：优势类群为灰褐类群，分离频率达到91.35%；其次是灰红紫类群，分离频率为82.15%，金色类群很少，仅在荒草地中分离到。

Come to the conclusion that the samples ( including the authentic and fake ) used in this study all contain Radix Rubia purpurin and rubimaillin , and the authentic ( not adulterated ) mostly has higher effective ingredients content than the fakes .

得出：本研究所用样品（包括茜草正品和伪品）均含有大叶茜草素和羟基茜草素，正品茜草（不掺杂）有效成分的含量普遍高于伪品。