An iridoid and a flavonoid from Sideritis lanata L

A new iridoid diglucoside, 10-O-(E)-p-coumaroylmelittoside (1) and a new flavone glucoside, O-(6'-O-Acetyl-)-beta-glucopyranosylchrysoeriol (2), together with four known flavone glycosides, were isolated from the aerial parts of Sideritis lanata. The structures of the new compounds were elucidated by spectroscopic methods, 2D NMR and MS.     

RP-HPLC法测定杜仲增免液中松脂醇二葡萄糖苷的含量

试验旨在建立测定杜仲增免液中松脂醇二葡萄糖苷含量的RP-HPLC法。以Inersustain^® C18（250 mm×4.6 mm,5 μm）为色谱柱,乙腈-0.2%磷酸（15：85）为流动相,流速1.0 mL/min,柱温35℃,紫外检测波长277 nm。以乙酸乙酯作为提取溶剂,在所建立的色谱条件下测定供试品溶液,以理论塔板数和分离度作为系统适用性指标。对对照品松脂醇二葡萄糖苷溶液进行线性回归,确定线性范围,考察分析方法的精密度、稳定性、重现性,并进行加样回收试验。结果显示,用所建立的方法测定供试品溶液中松酯醇二葡萄糖苷理论塔板数为8 588,分离度为3.046。松脂醇二葡萄糖苷对照品溶液在6~192 μg/mL浓度范围内线性关系良好,相关系数为0.9996;精密度试验结果显示松脂醇二葡萄糖苷对照品溶液峰面积相对标准偏差（relative standard deviation,RSD）为0.74%;重现性和稳定性试验结果显示供试品溶液中松酯醇二葡萄糖苷峰面积RSD分别为4.50%和2.69%;平均加样回收率为98.74%,RSD为0.65%（n=9）;在所建立的色谱条件下,供试品中松脂醇二葡萄糖苷的平均含量为0.124~0.127 mg/mL。结果表明,应用该方法测定杜仲增免液中松脂醇二葡萄糖苷的含量,系统适用性好,精密度高,重现性和稳定性好,回收率高,快速简便、准确可靠,可作为杜仲增免液中松脂醇二葡萄糖苷含量测定方法。     

微波辅助提取亚麻木脂素工艺及快速检测方法的研究

采用微波辅助提取法从亚麻籽饼粕中提取开环异落叶松树脂酚二葡萄糖苷(Secoisolariciresinol Diglucoside,SDG),确定了微波辅助最佳提取条件为70%乙醇,固液比为1∶8(g/mL),预浸搅拌30 min,辐照时间5 min,微波功率700 W。并建立了直接定性分析亚麻籽饼粕中SDG的TLC方法。经HPLC检测,亚麻籽饼粕中SDG含量为1.64%,微波辅助提取SDG粗提物产率为6.89%,纯化后SDG含量可达20.23%。结果表明:微波辅助提取制备SDG的方法与传统分离方法相比,得率高、工艺操作简单且安全无毒。     

亚麻籽中开环异落叶松树脂酚二葡萄糖苷的测定——高效液相色谱-二极管阵列检测 电喷雾质谱法

    采用高效液相色谱-二极管阵列检测-电喷雾质谱(HPLC-PAD-ESI-MS)法对开环异落叶松树脂酚二葡萄糖苷(SDG)进行定性和定量检测,研究方法的精密度、稳定性、定量检测限及加样回收率,并考察样品制备方法对定量检测结果的影响.采用Sephadex LH-20柱色谱分离制备SDG对照品,并用1H-NMR与13C-NMR对其进行表征.HPLC-PAD-ESI-MS检测所得紫外及电喷雾质谱信息与SDG结构相符.以自制的SDG(纯度96.6%)为对照,采用HPLC绘制定量标准曲线,方法精密度较高(RSD为1.36%),稳定性好(1周后RSD为1.21%),定量检测限较低(LOQ为3.4 mg·L-1),加样回收率达(99.7±3.2)%.此外,制样时采用碱法水解与混合溶剂提取,不仅节省时间,还更充分地提取了SDG.说明用HPLC-PAD-ESI-MS法栓测亚麻籽中的SDG方便省时,准确可靠.     

Grapevine selection for improving nutrient content and composition and the associated quality indices—a review

Genotype selection is an essential step in breeding programs determining nutrient content and composition and, thereby, the quality indices of grapevines and their products. The grapevine bioactive compounds, particularly flavonoids, are determinants of grape quality and possess strong health-promoting effects in grapevine and humans. Grapevine nutrient content and composition depends on genotype–environmental interaction in which genotype selection and stress conditions, particularly severity, time, and combination of stresses play significant roles in determining grape and wine quality. This review article aims to provide information required for appropriate genotype selection of grapevines for production of high-quality fruits. The influence of interacting factors, including genotype selection, grapevine metabolites, and environmental conditions, and their interrelationships on the quality of grapevines (flavor, aroma, pigmentation, color stability, and stress tolerance of red and white grapes) and their products (organoleptic properties and storage life of wine/must and juice) are discussed.     

杜仲茎点霉SP-16F产松脂醇二葡萄糖苷营养条件的优化

【目的】对杜仲茎点霉SP-16F发酵生产松脂醇二葡萄糖苷(PDG)的营养条件进行优化,以提高发酵液中的PDG产量。【方法】在单因素实验的基础上,通过三元二次中心组合设计和响应面分析法优化杜仲茎点霉SP-16F发酵产生PDG的最佳营养条件。【结果】在液体培养条件下,茎点霉SP-16F产PDG的最佳培养基组成为:蔗糖47.5 g/L,NaNO33.0 g/L,K2HPO42.83 g/L。在最佳培养条件下,PDG产量预测值较优化前的最大值提高了3倍以上。【结论】获得了茎点霉SP-16F的最佳产PDG培养基,有效地提高了其发酵产PDG的能力。     

Determination of Pinoresinol Diglucoside in Eucommie ulmoides Immunoenhancement Liquids by RP-HPLC

The assay was aimed to determine the content of pinoresinol diglucoside (PDG) in Eucommie ulmoides immunoenhancement liquids. The chromatographic conditions were as follows:Inersustain^® C18 column (250 mm×4.6 mm,5 μm) was under column temperature of 35℃, the mobile phase consisted of acetonitrile-0.2% phosphoric acid(15:85)with a flow rate of 1.0 mL/min,and the UV detection wavelength was 277 nm. Ethyl acetate was used as extraction solvent. In order to determine PDG of the test solution under the chromatographic conditions, the number of theoretical plates and resolution were used as system suitability indicators. Linear regression on reference substance (PDG),linearity range and the precision, stability, and reproducibility of the analysis method, the recovery test of adding samples were all determined. The results showed that under the content determination method, the number of theoretical plates of PDG in the test solution was 8 588, and the resolution was 3.046. PDG performed good linear relation at the linear range between 6 and 192 μg/mL, and the related coefficient was 0.9996. The precision experiments showed that the relative standard deviation (RSD) of reference substance solution was 0.74%. The RSD of reproducibility and stability of PDG in the test solution was 4.50% and 2.69%, respectively. The average recovery was 98.74% with RSD 0.65% (n=9). Under the chromatographic conditions established above, the contents of PDG in the test sample were between 0.124 and 0.127 mg/mL. The conclusion was that the RP-HPLC method performed well system suitability, precision, reoroducibility, stability, and high recovery rate. Meanwhile this method was quick, simple and reliable. It could be used to determine the content of PDG in Eucommie ulmoides immunoenhancement liquids.     

亚麻的开发利用研究

从亚麻籽和亚麻纤维2个方面,阐述了亚麻的开发利用潜能。     

茎点菌属产松脂醇二葡萄糖苷的培养条件优化(简报)

用响应面分析法对一株杜仲内生茎点霉(Phoma sp.)生产松脂醇二葡萄糖苷(PDG)的培养条件进行了优化,获得了PDG产量与各培养条件的回归模型,根据模型确定出PDG的最佳生产条件为：初始pH值8.4,摇床转速193 r/min,装液量100 mL,最佳条件下的PDG产量可达30 mg/L。最佳条件下试验所得值与模型预测值间的偏差小于5%。     

产PDG杜仲内生菌的分离筛选和分类鉴定及生长条件研究

【目的】分离筛选杜仲(Eucommia ul moides Oliv.)树皮中产松脂醇二葡萄糖苷(Pinoresinol diglu-coside,PDG)的内生真菌,为PDG的生产提供参考。【方法】采用表面灭菌法分离杜仲内生真菌,摇瓶培养分析各菌株产PDG的能力,结合形态学特征和rDNA内转录间隔区(Internal transcribed spacer,ITS)序列分析对高产菌株进行鉴定,研究培养温度、pH对其生长的影响及其对不同碳源和氮源的利用情况。【结果】共分离得到18株内生真菌,有3株具有产PDG能力,其中以菌株XP-8的PDG产量最高(11.65 mg/L),分类鉴定确定该菌株为拟茎点霉属(Phomopsis sp.)。菌株XP-8在20~35℃、pH4~8的条件下均能较好生长,在28℃、pH=5时生长最快;菌株XP-8对麦芽糖和葡萄糖的利用能力较强,不能利用苹果酸;对硝酸钠的利用能力较强,但不能利用天门冬氨酸。【结论】获得了高产PDG的菌株XP-8,确定了其分类学地位,并研究了其生长特点。