Abstract A new yellow carotenoid, named 5,6-dihydrocrustaxanthin (6), was isolated together with five yellow xanthophylls: isoastaxanthin (1), 5,6-dihydropenaeusxanthin (2), penaeusxanthin (3), tetrahydroxypirardixanthin (4), and crustaxanthin (5) from three species of prawns: Marsupenaeus japonicus, Litopenaeus vannamei, and Metapenaeus joyneri, belonging to Penaeidae. The structure of (6) was determined to be (3R,4S,5R,6R,3′R,4′S)-5,6-dihydro-β,β-carotene-3,4,3′,4′-tetrol by UV-VIS, MS, 1H NMR, and CD spectral data. Distributions of yellow xanthophylls (1–6) in ten species of shrimps were investigated from a chemo-systematic point of view. Yellow xanthophylls (1–6) were present in only three species of prawns described above, among the ten species of shrimps investigated. Instead of 1–6, luteins and tunxanthins, having the 3-hydroxy-e-end group, were present in other species of shrimps belonging to Penaeidae, Pandalidae, and Palaemonidae.

中文翻译：

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一种新的类胡萝卜素，5,6-二氢甲壳素，来自对虾和黄叶黄素在虾中的分布

摘要 一种新的黄色类胡萝卜素，名为 5,6-二氢甲壳素 (6)，与五种黄色叶黄素一起被分离出来：异虾青素 (1)、5,6-二氢虾黄素 (2)、对虾黄素 (3)、四羟基甲壳黄素 (4) 和甲壳黄素。 (5)来自三种对虾：Marsupenaeus japonicus、Litopenaeus vannamei和Metapenaeus joyneri，属于对虾科。(6)的结构确定为(3R,4S,5R,6R,3'R,4'S)-5,6-dihydro-β,β-carotene-3,4,3',4'-通过 UV-VIS、MS、1H NMR 和 CD 光谱数据分析四醇。从化学系统的角度研究了 10 种虾中黄叶黄素 (1-6) 的分布。在所调查的 10 种虾中，黄色叶黄素 (1-6) 仅存在于上述三种虾中。而不是 1-6，叶黄素和吞黄质，具有 3-羟基-e-末端基团，