柠条锦鸡儿叶黄酮苷类成分分离及抗氧化活性研究

Isolation and Antioxidant Activity of Flavonoid Glycosides from Leaves of Caragana korshinskii Kom.

  • 摘要: 采用高速逆流色谱(high-speed counter-current chromatography,HSCCC)结合制备液相色谱(preparative high performance liquid chromatography,prep-HPLC)对柠条锦鸡儿(Caragana korshinskii Kom.)叶的大孔树脂30%乙醇洗脱部位进行分离. 以乙酸乙酯∶正丁醇∶水(体积比3∶7∶10)为HSCCC溶剂对样品进行初步分段分离. 随后,采用prep-HPLC对HSCCC组分进一步分离纯化. 采用1H-NMR和13C-NMR对分离得到的化合物进行结构鉴定,得到11种黄酮苷类化合物,分别为(1)槲皮素-3-O-α-L-鼠李糖基(1→6)-β-D-吡喃半乳糖苷-7-O-α-L-鼠李糖苷、(2)芦丁-7-O-α-L-鼠李糖苷、(3)异鼠李素-3-O-α-L-鼠李糖基(1→6)-β-D-吡喃半乳糖苷-7-O-α-L-鼠李糖苷、(4)异鼠李素-3-O-α-L-鼠李糖基(1→6)-β-D-葡萄糖苷-7-O-α-L-鼠李糖苷、(5)山柰酚-3-O-α-L-鼠李糖基-(1→6)-β-D-半乳糖苷-7-O-α-L-鼠李糖苷、(6)槲皮素-3-O-β-D-半乳糖苷-7-O-α-L-鼠李糖苷、(7)槲皮素-3-O-β-D-葡萄糖苷-7-O-α-L-鼠李糖苷、(8)异鼠李素-3-O-β-D-半乳糖苷-7-O-α-L-鼠李糖苷、(9)异鼠李素-3-O-β-D-葡萄糖苷-7-O-α-L-鼠李糖苷、(10)山柰酚-3-O-β-D-半乳糖苷-7-O-α-L-鼠李糖苷、(11)山柰酚3-O-β-D-葡萄糖苷-7-O-α-L-鼠李糖苷. 采用DPPH(2, 2-二苯基-1-吡啶并肼基)、·OH、O2−·、ABTS(2, 2'-联氮-双-3-乙基苯并噻唑啉-6-磺酸)自由基清除试验对分离化合物进行抗氧化活性评价. 通过分子对接技术评价了化合物与9种氧化应激酶的相互作用. 体外抗氧化试验结果显示化合物1、2、6、7具有较好的抗氧化活性,构效关系分析得知3'与4'位的双羟基基团为主要的活性基团. 分子对接表明,化合物1、2、6、7与9种氧化应激酶有较高的结合能,主要通过3'与4'位的双羟基形成氢键,与抗氧化试验和构效关系分析结果吻合. 为柠条锦鸡儿叶资源的综合开发利用提供了理论依据和技术支持.

     

    Abstract: The eluted fraction of Caragana korshinskii Kom. leaves, which was eluted with 30% ethanol on a macroporous resin, was used to separate the compounds by high-speed counter-current chromatography (HSCCC) and preparative high-performance liquid chromatography (prep-HPLC). A solvent system of ethyl acetate∶n-butanol∶water (volume ratio=3∶7∶10) was utilized for the initial HSCCC separation. Subsequently, the fractions obtained from HSCCC underwent further purification through prep-HPLC. Structural identification of the isolated compounds was conducted using 1H-NMR and 13C-NMR. A total of 11 flavonoid glycosides were separated, identified as follows: (1) quercetin-3-O-α-L-rhamnosyl (1→6)-β-D-galactopyranoside-7-O-α-L-rhamnoside, (2) rutin-7-O-α-L-rhamnoside, (3) isorhamnetin-3-O-α-L-rhamnosyl (1→6)-β-D-galactopyranoside-7-O-α-L-rhamnoside, (4) isorhamnetin-3-O-α-L-rhamnosyl (1→6)-β-D-glucoside-7-O-α-L-rhamnoside, (5) kaempferol-3-O-α-L-rhamnosyl (1→6)-β-D-galactoside-7-O-α-L-rhamnoside, (6) quercetin-3-O-β-D-galactoside-7-O-α-L-rhamnoside, (7) quercetin-3-O-β-D-glucoside-7-O-α-L-rhamnoside, (8) isorhamnetin-3-O-β-D-galactoside-7-O-α-L-rhamnoside, (9) isorhamnetin-3-O-β-D-glucoside-7-O-α-L-rhamnoside, (10) kaempferol-3-O-β-D-galactoside-7-O-α-L-rhamnoside, and (11) kaempferol-3-O-β-D-glucoside-7-O-α-L-rhamnoside. The antioxidant activities were evaluated using DPPH (2, 2-diphenyl-1-picrylhydrazyl), hydroxyl radicals (·OH), superoxide anion (O2−·), and ABTS (2, 2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid) assays. Additionally, molecular docking studies were performed to assess the interactions of the compounds with 9 oxidative stress enzymes. In vitro antioxidant assays revealed that compounds 1, 2, 6, and 7 exhibited significant antioxidant activities. Structure-activity relationship analysis indicated that the dihydroxyl groups at positions 3' and 4' were the primary active moieties. Molecular docking studies demonstrated that compounds 1, 2, 6, and 7 possessed high binding affinities with the 9 oxidative stress enzymes, primarily through hydrogen bonding facilitated by the dihydroxyl groups at positions 3' and 4', consistented with the findings from the antioxidant assays and structure-activity relationship analysis. This study provided a theoretical foundation and technical support for the comprehensive development and utilization of Caragana korshinskii Kom. leaf resources.

     

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