Synthesis of (3S,3′S)- and meso-Stereoisomers of Alloxanthin and Determination of Absolute Configuration of Alloxanthin Isolated from Aquatic Animals
作者:Yumiko Yamano、Takashi Maoka、Akimori Wada
DOI:10.3390/md12052623
日期:——
In order to determine the absolute configuration of naturally occurring alloxanthin, a HPLC analytical method for three stereoisomers 1a–c was established by using a chiral column. Two authentic samples, (3S,3′S)- and meso-stereoisomers 1b and 1c, were chemically synthesized according to the method previously developed for (3R,3′R)-alloxanthin (1a). Application of this method to various alloxanthin specimens of aquatic animals demonstrated that those isolated from shellfishes, tunicates, and crucian carp are identical with (3R,3′R)-stereoisomer 1a, and unexpectedly those from lake shrimp, catfish, biwa goby, and biwa trout are mixtures of three stereoisomers of 1a–c.
为了确定天然存在的全黄素的绝对构型,采用手性柱建立了三种立体异构体1a–c的HPLC分析方法。根据之前为(3R,3′R)-全黄素(1a)开发的方法,化学合成了两个认证样品,即(3S,3′S)-和meso立体异构体1b和1c。将该方法应用于多种水生动物的全黄素样品表明,从贝类、 Tunicates和鲤鱼中分离出的全黄素与(3R,3′R)-立体异构体1a相同,而意外的是,从湖虾、鲇鱼、琵琶鲽和琵琶鳟中分离出的样品则是三种立体异构体1a–c的混合物。