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银杏叶色素类化合物的提取分离及结构鉴定

Extraction, Isolation and Structure Identification of Pigment Compounds from Ginkgo biloba Leaves

  • 摘要: 以银杏鲜叶(样品1)、银杏干叶(样品2)和银杏陈叶(样品3)为原料,制备了3个样品的乙醇提取物,采用HPLC-DAD-MS法分析3个样品中银杏叶色素类化合物的组成;通过液液萃取、硅胶柱层析和HPLC制备色谱等技术手段对样品2和样品3的银杏叶色素类化合物进行了分离纯化和结构鉴定。从3个样品中初步推测出24种银杏叶色素类化合物,其中叶绿素类化合物17种,类胡萝卜素类化合物7种。从样品2和样品3的乙醇提取物浸膏中分离纯化出10种银杏叶色素单体化合物,通过质谱、紫外光谱、红外光谱和核磁共振氢谱数据分析,并结合文献对照鉴定化合物分别为:β-胡萝卜素(A)、脱镁叶绿素a(B)、脱镁叶绿素b(C)、叶黄素(D)、植基紫红素18a(E)、焦脱镁叶绿素a(F)、132-羟基脱镁叶绿素a(G)、132-羟基脱镁叶绿素a'(H)、132-羟基脱镁叶绿素b(I)、132-羟基脱镁叶绿素b'(J),其中EFGHIJ为首次从银杏叶中分离得到。

     

    Abstract: Ethanol extracts of three samples were prepared from Ginkgo biloba L. fresh leaves(sample 1), dry leaves(sample 2) and old leaves(sample 3). HPLC-DAD-MS method was used to analyze the pigment compounds in three G. biloba leaves samples. The separation, purification and structure identification of ginkgo leaf pigment compounds in sample 2 and sample 3 were conducted by liquid-liquid extraction, silica gel column chromatography, HPLC preparative chromatography, etc. From the three samples, 24 kinds of pigment compounds in G. biloba leaves were preliminarily speculated, including 17 kinds of chlorophyll compounds and 7 kinds of carotenoid compounds. Ten monomer pigment compounds in G. biloba leaves were isolated and purified from ethanol extract of sample 2 and sample 3. They were identified as β-carotene (A), pheophytin a (B), pheophytin b (C), lutein (D), phy-purpurin 18a (E), pyropheophytin a (F), 132-OH-pheophytin a (G), 132-OH-pheophytin a' (H), 132-OH-pheophytin b (I), and 132-OH-pheophytin b' (J), respectively, by mass spectrometry, ultraviolet spectroscopy, infrared spectroscopy and proton nuclear magnetic resonance spectroscopy combined with literature comparison. Among them, E, F, G, H, I and J were isolated from G. biloba leaves for the first time.

     

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