Isolation and Structural Elucidation of (13<i>Z</i>,13‘<i>Z</i>,3<i>R</i>,3‘<i>R</i>,6‘<i>R</i>)-Lutein from Marigold Flowers, Kale, and Human Plasma
作者:Frederick Khachik、Andrea Steck、Hanspeter Pfander
DOI:10.1021/jf980823w
日期:1999.2.1
(13Z,13'Z,3R,3'R,6'R)-Lutein has been isolated and purified from extracts of marigold flowers, fresh raw kale (Brassica oleracea var. Acephala), and human plasma and fully characterized by H-1 and C-13 NMR, UV/vis, and MS. While the concentration of (13Z,13'Z)-lutein in kale and human plasma compared to (all-E,3R,3'R,6'R)-lutein was found to be quite low, this compound was readily isolated by fractional crystallization of lutein from marigold extracts. Thus, the mother liquors from two consecutive crystallizations of lutein from a saponified extract of marigold flowers were enriched in (13Z,13'Z)-lutein (8.7% of total carotenoids) and employed for the isolation of this compound by HPLC. The identity of the di-Z-lutein in kale and human plasma has been established by comparison of the HPLC-UV/vis-MS profiles of the purified compounds with those of a fully characterized sample, isolated from marigolds. 3-Hydroxy-beta,epsilon-caroten-3'-one and 3'-epilutein have also been identified in extracts from marigolds.
(13Z,13'Z,3R,3'R,6'R)-叶黄素是从金盏花、新鲜的原始甘蓝(Brassica oleracea var. Acephala)和人血浆中提取并纯化的,通过H-1和C-13核磁共振、UV/vis和质谱进行了全面表征。虽然 Kale 和人血浆中的 (13Z,13'Z)-叶黄素浓度相对于 (all-E,3R,3'R,6'R)-叶黄素较低,但这种化合物通过金盏花提取物中叶黄素的分数结晶很容易分离。因此,两次连续从皂化金盏花提取物中结晶叶黄素的母液富含 (13Z,13'Z)-叶黄素(占类胡萝卜素总量的 8.7%),并用于通过 HPLC 分离该化合物。通过比较纯化化合物与从金盏花分离的完全表征样品的 HPLC-UV/vis-MS 图谱,确定了 Kale 和人血浆中的 di-Z 叶黄素。在金盏花提取物中还鉴定出 3-羟基-β,ε-胡萝卜-3'-酮和 3'-表叶黄素。