Two new phenolic compounds were isolated from whole plant ofArtemisia sphaerocephala. The structures were elucidated on the basis of spectroscopic methods as 4-（1-hydroxylethyl）-phenol-l-O-β-D-glucopyranoside and 4...Two new phenolic compounds were isolated from whole plant ofArtemisia sphaerocephala. The structures were elucidated on the basis of spectroscopic methods as 4-（1-hydroxylethyl）-phenol-l-O-β-D-glucopyranoside and 4-O-acetophenone-β-D-gluco- pyranosyl-（1-3）-β-D-glucopyranoside.展开更多
Artemisia sphaerocephala Krasch.(Asteraceae)is one of the most important pioneer plants of the moving and semi-stable sand dunes in the deserts of China(Liu,1985).In natural habitats,mature achenes are dispersed by wi...Artemisia sphaerocephala Krasch.(Asteraceae)is one of the most important pioneer plants of the moving and semi-stable sand dunes in the deserts of China(Liu,1985).In natural habitats,mature achenes are dispersed by wind and adhere to sand grains by the mucilaginous layer that develops from the pellicle when the achene sur-face is wetted.This also occurs in A.monosperma and A.sieberi,which are dominant shrubs in the Negev Desert of Israel(Gutterman,1993;Huang and Gutter-man,1998,1999a).The mucilaginous layers of Artemisia achenes are of ecological and ecophysiological importance.The thick pellicle of these species serves as a means of water catchment as well as helping the seed ad-here to sand particles.Strong adherence to the sand sur-face once the mucilage is dry prevents further dispersion by rain and wind and deters collection by ants and other seed predators(Huangand Gutterman,1999b,2000).展开更多
Artemisia sphaerocephaia is a sand-fixing shrub oc-curring in the deserts of Northwest China.The polysac-charide pellicle that surrounds the achene forms during seed development and becomes a thick mucilaginous layer ...Artemisia sphaerocephaia is a sand-fixing shrub oc-curring in the deserts of Northwest China.The polysac-charide pellicle that surrounds the achene forms during seed development and becomes a thick mucilaginous layer when the dry seed is wetted.In natural habitals,the ach-enes start to mature from September to Octaber1.The mature achenes,enclosed in their dry polysaccharide pel-licles,are dispersed by wind and adhere to sand grains by the mucilaginous layer that develops from the pellicle when the achene surface is wetted.A major component of the mucilage on the exterior of the pericarp is pectin.The thick pellicle of these species serves as a means of water catchment as well as helping the seed adhere to sand par-ticles.Strong adherence to the sand surface once the mu-cilage is dry prevents further dispersion by rain and wind and deters collection by ants and other seed preda-torg[2.3].展开更多
5,3′,4′-Trihydroxy-7-methoxyflavanone was isolated from Artemisia sphaeroce- phala Kraschen and characterized by 1H-NMR, 13C-NMR, EI-MS, IR, UV spectra, and single- crystal X-ray diffraction. The title compound crys...5,3′,4′-Trihydroxy-7-methoxyflavanone was isolated from Artemisia sphaeroce- phala Kraschen and characterized by 1H-NMR, 13C-NMR, EI-MS, IR, UV spectra, and single- crystal X-ray diffraction. The title compound crystallizes in orhtorhombic space group Pca21, with a = 14.393（3）, b = 5.1629（12）, c = 36.919（9）, V = 2743.4（11）3, Z = 8, Mr = 302.27, Dc = 1.464 g/cm3, F（000） = 1264, μ = 0.113 mm-1, S = 1.015,（Δ/σ）max = 0.000, the final R = 0.0757 and wR = 0.1809. Structural analysis indicates the title compound consists of two 5,3′,4′-trihydroxy- 7-methoxyflavanone enantiomers in a well-defined arrangement within the crystal lattice, which constructs a three-dimensional network by means of multiple O–H…O hydrogen bonds.展开更多
为探讨多糖乙酰基团对原花青素理化性质的影响,分析了不同乙酰基取代度(degrees of acetyl group substitution,DS)的沙蒿葡甘聚糖对葡萄籽原花青素(grape seed proanthocyanidins,GSP)消化特性的作用。通过高效体积排阻色谱-多角激光...为探讨多糖乙酰基团对原花青素理化性质的影响,分析了不同乙酰基取代度(degrees of acetyl group substitution,DS)的沙蒿葡甘聚糖对葡萄籽原花青素(grape seed proanthocyanidins,GSP)消化特性的作用。通过高效体积排阻色谱-多角激光光散射联用分析发现,沙蒿葡甘聚糖在模拟消化过程中分子质量保持稳定。结合总酚、总黄酮含量测定以及超高效液相二级质谱-四极杆飞行时间联用仪的结果发现,葡甘聚糖能够提高GSP在消化液中溶解,提高儿茶素、表儿茶素等单体酚的含量。葡甘聚糖对GSP在消化液中的抗氧化能力和酶活抑制能力有显著影响。葡甘聚糖能够提升GSP对DPPH自由基的清除能力,效果随DS升高而减弱。葡甘聚糖能够提高GSP对α-葡萄糖苷酶和胰脂肪酶活性的抑制能力,效果随DS的升高而增强。GSP中的儿茶素、表儿茶素、没食子儿茶素、表儿茶素没食子酸酯、儿茶素没食子酸酯、原花青素B1、原花青素B2、三聚体与其抗氧化或酶活抑制能力呈显著正相关,表儿茶素没食子酸酯可能在其中起到重要作用。研究结果表明,乙酰化葡甘聚糖影响了GSP的消化特性,DS是其中的关键因素。对原花青素与具有特定结构特征多糖的相互作用的深入探讨,可以为原花青素生物活性功能的提升提供理论依据。展开更多
文摘Two new phenolic compounds were isolated from whole plant ofArtemisia sphaerocephala. The structures were elucidated on the basis of spectroscopic methods as 4-（1-hydroxylethyl）-phenol-l-O-β-D-glucopyranoside and 4-O-acetophenone-β-D-gluco- pyranosyl-（1-3）-β-D-glucopyranoside.
文摘Artemisia sphaerocephala Krasch.(Asteraceae)is one of the most important pioneer plants of the moving and semi-stable sand dunes in the deserts of China(Liu,1985).In natural habitats,mature achenes are dispersed by wind and adhere to sand grains by the mucilaginous layer that develops from the pellicle when the achene sur-face is wetted.This also occurs in A.monosperma and A.sieberi,which are dominant shrubs in the Negev Desert of Israel(Gutterman,1993;Huang and Gutter-man,1998,1999a).The mucilaginous layers of Artemisia achenes are of ecological and ecophysiological importance.The thick pellicle of these species serves as a means of water catchment as well as helping the seed ad-here to sand particles.Strong adherence to the sand sur-face once the mucilage is dry prevents further dispersion by rain and wind and deters collection by ants and other seed predators(Huangand Gutterman,1999b,2000).
文摘Artemisia sphaerocephaia is a sand-fixing shrub oc-curring in the deserts of Northwest China.The polysac-charide pellicle that surrounds the achene forms during seed development and becomes a thick mucilaginous layer when the dry seed is wetted.In natural habitals,the ach-enes start to mature from September to Octaber1.The mature achenes,enclosed in their dry polysaccharide pel-licles,are dispersed by wind and adhere to sand grains by the mucilaginous layer that develops from the pellicle when the achene surface is wetted.A major component of the mucilage on the exterior of the pericarp is pectin.The thick pellicle of these species serves as a means of water catchment as well as helping the seed adhere to sand par-ticles.Strong adherence to the sand surface once the mu-cilage is dry prevents further dispersion by rain and wind and deters collection by ants and other seed preda-torg[2.3].
基金supported by the Science and Technology Agency of Henan Province(112102310305)the International Cooperation Program of Henan Province(No.092102310282)
文摘5,3′,4′-Trihydroxy-7-methoxyflavanone was isolated from Artemisia sphaeroce- phala Kraschen and characterized by 1H-NMR, 13C-NMR, EI-MS, IR, UV spectra, and single- crystal X-ray diffraction. The title compound crystallizes in orhtorhombic space group Pca21, with a = 14.393（3）, b = 5.1629（12）, c = 36.919（9）, V = 2743.4（11）3, Z = 8, Mr = 302.27, Dc = 1.464 g/cm3, F（000） = 1264, μ = 0.113 mm-1, S = 1.015,（Δ/σ）max = 0.000, the final R = 0.0757 and wR = 0.1809. Structural analysis indicates the title compound consists of two 5,3′,4′-trihydroxy- 7-methoxyflavanone enantiomers in a well-defined arrangement within the crystal lattice, which constructs a three-dimensional network by means of multiple O–H…O hydrogen bonds.
文摘为探讨多糖乙酰基团对原花青素理化性质的影响,分析了不同乙酰基取代度(degrees of acetyl group substitution,DS)的沙蒿葡甘聚糖对葡萄籽原花青素(grape seed proanthocyanidins,GSP)消化特性的作用。通过高效体积排阻色谱-多角激光光散射联用分析发现,沙蒿葡甘聚糖在模拟消化过程中分子质量保持稳定。结合总酚、总黄酮含量测定以及超高效液相二级质谱-四极杆飞行时间联用仪的结果发现,葡甘聚糖能够提高GSP在消化液中溶解,提高儿茶素、表儿茶素等单体酚的含量。葡甘聚糖对GSP在消化液中的抗氧化能力和酶活抑制能力有显著影响。葡甘聚糖能够提升GSP对DPPH自由基的清除能力,效果随DS升高而减弱。葡甘聚糖能够提高GSP对α-葡萄糖苷酶和胰脂肪酶活性的抑制能力,效果随DS的升高而增强。GSP中的儿茶素、表儿茶素、没食子儿茶素、表儿茶素没食子酸酯、儿茶素没食子酸酯、原花青素B1、原花青素B2、三聚体与其抗氧化或酶活抑制能力呈显著正相关,表儿茶素没食子酸酯可能在其中起到重要作用。研究结果表明,乙酰化葡甘聚糖影响了GSP的消化特性,DS是其中的关键因素。对原花青素与具有特定结构特征多糖的相互作用的深入探讨,可以为原花青素生物活性功能的提升提供理论依据。
