Analysis of the Volatile Components of Polygonum chinense L.Extracted with Different Solvents by GC-MS

[Objectives]This study was conducted to investigate the volatile components of Polygonum chinense L.[Methods]The volatile components of the methanol extract,ethyl acetate extract,chloroform extract and petroleum ether extract of P.chinense were analyzed and determined by gas chromatography.[Results]The volatile components of the methanol extract from P.chinense were the most,and phenolic acids and ketones accounted for a relatively high proportion,among which pyrogallic acid had the highest content.The ethyl acetate extract contained the second most volatile components,mostly acids and esters,of whichβ-sitosterol had the highest content;the chloroform and petroleum ether extracts had relatively few types of volatile components,most of which were alkanes,and the content ofγ-sitosterol shared by the two was the highest.The common substances of the four extracts were palmitic acid and phytol.[Conclusions]This study provides a theoretical basis for the quality evaluation of P.chinense and a scientific basis for its resource development.

HPLC法同时测定杠板归不同部位中5种成分的含量

目的建立高效液相色谱法同时测定杠板归不同部位(茎、叶、根)中5种成分的含量。方法采用Luna?-C18(4.6 mm×250 mm,5μm)色谱柱,以乙腈-0.1%磷酸水为流动相梯度洗脱,流速为1.0 mL/min,检测波长为320 nm,柱温为30℃,测定杠板归不同部位中绿原酸、咖啡酸、芦丁、阿魏酸、槲皮素的含量。结果绿原酸、咖啡酸、芦丁、阿魏酸、槲皮素分别在0.046~4.6μg/mL,0.212~21.2μg/mL,0.055~5.5μg/mL,0.084~8.4μg/mL,0.114~11.4μg/mL范围内质量浓度与峰面积呈线性关系良好(r>0.9990),平均加样回收率为97.65%~102.09%,RSD为1.76%~2.44%。不同部位中5种成分含量差异较大,绿原酸和咖啡酸2个成分在叶中含量高,且远远高于根和茎中的含量;芦丁和阿魏酸主要存在于茎和根中,叶中未检测到;槲皮素在茎中含量最高,叶中次之,根中最低。结论建立的HPLC方法准确可靠、重复性好、专属性强,可用于杠板归不同部位中5个成分含量的同时测定。

人工湿地园沼泽植物水蓼(Polygonum hydropiper L.)的蒸腾特性日变化

对人工湿地园中沼泽植物水蓼(PolygonumhydropiperL.)蒸腾特性日变化进行了研究。结果表明:水蓼叶片的蒸腾速率日进程在晴朗的天气呈单峰曲线变化,最高峰值出现在下午的14:00。受光量子通量密度的影响最大,相关系数为0.668。与相对湿度的变化呈正相关(r=0.607),说明水蓼的蒸腾速率日变化是受其自身所具有的特殊生理特性所决定。叶片气孔阻力直接影响蒸腾速率。

Effects of Drought Stress on Contents of Endogenous Hormones in Leaves of Different Clones of Liriodendron chinense×L. tulipifera

[Objective] The aim was to study the effects of drought stress on contents of endogenous hormones in leaves of different clones of Liriodendron chinense×L. tulipifera. Drought-resistant Liriodendron chinense×L. tulipifera clones NE25,NE78 and drought-sensitive Liriodendron chinense×L. tulipifera clones NE04,NE23 were selected as experimental materials to study the content changes of four kinds of endogenous hormones such as abscisic acid （ABA）,indoleacetic acid （IAA）,ribosylzeatin （ZR） and jasmonic acid （JA） in leaves of different clones under drought stress. [Result] Under drought stress,ABA was accumulated I leaves of different clones,however,the content changes in drought-resistant clones were not obvious; IAA content showed a decreasing trend,and the content changes n drought-resistant clones during later period of drought stress was decreased; JA content showed an increasing trend in leaves of drought-sensitive clones,indicating that drought-sensitive clones had to maintain higher contents of JA to resist drought stress. [Conclusion] The result of this study had provided scientific basis for the screening,planting and application of drougt-resistant clones of Liriodendron chinense×L. tulipifera.

湿地植物水蓼(Polygonum hydropiper L.)对镉的富集特征及生理响应

以人工湿地修复镉污染水体时,植物在镉离子的沉淀、吸收和积累等过程中起着关键作用,但当前报道的镉富集植物种类较少,湿地植物对镉胁迫的生长及生理响应缺乏系统研究,限制了湿地植物在镉污染水体修复中的应用。笔者以常见湿地植物水蓼(Polygonum hydropiper L.)为对象,设置了4个镉处理浓度(0、0.5、1和2 mg·L^-1),研究了水蓼对镉的富集特征以及生长和生理响应。水蓼根、茎和叶的镉含量(以干重计)随镉处理浓度的增加而升高,处理30 d时,在2 mg·L^-1处理下分别达到134、47和48 mg·kg^-1。处理30 d时,在1 mg·L^-1的镉处理下,水蓼的地上部及地下部富集系数和转运系数最高,地上部和地下部富集系数分别为45.6和111.7,转运系数为0.41。在处理15 d时,水蓼生物量、叶绿素含量和超氧化物歧化酶(SOD)活性在2 mg·L^-1处理下显著降低。在处理30 d时,水蓼的总生物量在不同镉浓度下无显著差异,但丙二醛(MDA)含量、SOD和过氧化氢酶(CAT)活性在0.5~2 mg·L^-1镉处理下均显著升高,叶绿素含量下降。这些结果表明,水蓼可以通过提高抗氧化酶活性等机理抵抗镉胁迫产生的氧化伤害,并且水蓼对镉的富集和转运系数较高,具有在镉污染水体修复中应用的潜力。

Optimization on Ultrasonic Extraction Method of Total Flavonoids for Liriodendron chinense Sarg.×L.tulipifera L. by Response Surface Methodology (RSM)

With the leaves,bark and roots of Liriodendron chinense Sarg.× L.tulipifera L.as experiment materials,the ultrasonic-assisted extraction conditions of total flavonoids were optimized by response surface Box-Behnken test design.Ultrasonic time and liquid-to-solid ratio had significant effects on the extraction amount of flavonoids from the leaves of L.chinense Sarg.× L.tulipifera L.;ultrasonic temperature and liquid-to-solid ratio had an interaction on the extraction amount of flavonoids;and the optimum ultrasonic time,temperature and liquid-to-solid ratio for the extraction of flavonoids from leaves of L.chinense Sarg.× L.tulipifera L.were 19.82 min,28.60 ℃ and 9.48 ml/g,respectively.Ultrasonic time,temperature and liquid-to-solid ratio had significant effects on the extraction amount of flavonoids from L.chinense Sarg.× L.tulipifera L.;there was a significant interaction between any two of the factors,which had a significant effect on the extraction of flavonoids;and the optimum extraction parameters for flavonoids in the bark were the ultrasonic time of 33.66 min,the ultrasonic temperature at 32.85 ℃ and the liquid-to-solid ratio of 11.39 ml/g.Ultrasonic time and liquid-to-solid ratio had significant effects on the extraction of flavonoids from roots;there was a significant interaction between ultrasonic time and liquid-to-solid ratio and between ultrasonic temperature and liquid-to-solid ratio;and the optimum extraction parameters for flavonoids from the roots of L.chinense Sarg.× L.tulipifera L.were the ultrasonic time of 32.38 min,the ultrasonic temperature at 25.0 ℃ and the liquid-to-solid ratio of 8.00 ml/g.The results of the three models were stable.The models are feasible and have good application value.

两柄蓼(Polygonum amphibium)在不同水条件下的生物学特性的研究

本文首次报道了两栖蓼有三种类型植株以及各种类型植株间随水条件变化而转化的情况。对两栖蓼各类型植株能否开花,是否具酸味以及两栖蓼分类学问题进行了探讨。

Evaluation of antihyperlipidemic effect of Polygonum minus,a South East Asian salad plant in poloxamer 407-induced acute hyperlipidemic rats

OBJECTIVE To investigate the antihyperlipidemic effect of methanol and aqueous extracts of the leaves of Polygonum minus in acute hyperlipidemic rat model.METHODS Acute hyperlipidemia was chemically induced in Sprague Dawley rats by using poloxamer 407(500mg·kg-1 of body weight;intraperitoneal).Increase in total cholesterol was confirmed after six hours of induction.The normal and hyperlipidemic control groups were administered with 1mL carboxymethylcellulose(CMC),the two test groups received aqueous and methanol extract of leaves of P.minus respectively(1000mg·kg-1;orally;suspended in 1% CMC)whereas reference standard treated group received atorvastatin(60mg·kg-1;orally;suspended in 1% CMC)once daily for 3consecutive days.Blood samples were collected at 10 th and 24 th hour of the study for total cholesterol and triglycerides determination,while terminal blood samples were collected at58 th hour for full lipids profile analysis.RESULTS In the present study,both methanol and aqueous extracts lowered the serum total cholesterol and triglycerides significantly(P<0.001 and P<0.05,respectively)when compared with the hyperlipidemic control,similar to the standard drug atorvastatin.Varying effects were observed for both extracts on the other lipid parameter studied.Methanol extract showed significant reduction in LDL(P<0.05),VLDL(P<0.01)and atherogenic index(AI;P<0.001)and it showed a significant elevation in HDL levels(P<0.05).On the other hand,the aqueous extract showed significant reduction only in VLDL and AI(P<0.05)but no increase in HDL levels.CONCLUSION Present study confirmed the antihyperlipidemic effect of leaves of P.minus in acute hyperlipidemic rat model.The study also suggested that the methanol extract possess higher antihyperlipidemic effect than aqueous extract.Currently a study is ongoing to evaluate the antihyperlipidemic effect of the methanol extract in high-fat diet-induced chronic hyperlipidemic rat model.

基于网络药理学研究杠板归(Polygonum perfoliatum L.)抗蛇毒的作用机制

目的:分析杠板归抗蛇毒的可能作用机制,为揭示其抗蛇毒价值提供参考。方法:采用上海有机所化学专业数据库获取杠板归化学成分,在TCMSP数据库中根据化合物类药性(DL) 】0.18标准对有效成分进行筛选。利用PubChem数据库下载有效成分SMILES格式,通过Swiss Target Prediction和STITCH数据库得到预测靶点。于GeneCards数据库中获取蛇毒相对应的靶标基因,与预测靶点比对获取杠板归抗蛇毒靶基因,运用STRING构建蛋白质间相互作用网络,DAVID进行GO和KEGG富集分析,Cytoscape构建杠板归对蛇毒作用的“化合物–靶点–通路”网络图。结果:类药性DL 】0.18筛选出杠板归12种有效活性成分,涉及抗蛇毒靶点17个,其中核心靶点是ELANE,PTGS2,HMOX1,MMP2,LYN,CASP8,STAT1,CASP9,TP53,参与19KEGG通路和56个生物过程。结论:杠板归对蛇毒有多成分–多靶点–多途径治疗优势,有开发为蛇毒治疗药物的可能性。

火炭母通过调控TLR4-TBK1信号通路改善鼠伤寒沙门菌感染小鼠空肠的炎症反应

为了探讨火炭母对鼠伤寒沙门菌感染小鼠空肠的免疫保护作用及其潜在机制。本试验将48只雌性BALB/c小鼠随机分为6个组:空白对照组、模型组、阳性药物组和火炭母高、中、低剂量组,每组8只。阳性药物组小鼠灌胃庆大霉素[20 mg/(kg·bw)],火炭母高、中、低剂量组小鼠分别按16、8和4 g/(kg·bw)剂量灌胃火炭母,空白对照组和模型组小鼠给予等体积的灭菌生理盐水,共连续给药8 d。预防性给药2 d后,每只小鼠(空白对照组除外)灌胃0.2 mL半数致死量(LD 50)鼠伤寒沙门菌(5×10^(4) CFU/mL)致病。给药结束后,处死小鼠取空肠用于组织病理学检查和Western blot。结果显示,鼠伤寒沙门菌感染后,小鼠空肠杯状细胞和肠腺红细胞增多、肠绒毛结构松散,火炭母各剂量组小鼠空肠杯状细胞和肠腺红细胞明显减少,火炭母减轻了小鼠空肠组织损伤。Western blot结果显示,与空白对照组相比,模型组小鼠空肠中免疫因子β干扰素(IFN-β)蛋白表达显著上升(P<0.05),γ干扰素(IFN-γ)蛋白表达显著下降(P<0.05),干扰素调节因子3(IRF3)、磷酸化TANK结合激酶1(p-TBK1)和Toll样受体4(TLR4)蛋白表达显著上调(P<0.05),炎性因子白介素-6(IL-6)、白介素-1β(IL-1β)和核因子κB p65(NF-κB p65)蛋白表达显著上升(P<0.05);与模型组相比,不同剂量火炭母可以不同程度降低炎症因子IL-6(P<0.05或P>0.05)、IL-1β(P<0.05)和NF-κB p65(P<0.05)蛋白表达,显著提高TLR4、β干扰素TIR结构域衔接蛋白(TRIF)蛋白的表达和TANK结合激酶1(TBK1)蛋白表达及其磷酸化水平(P<0.05),提高下游信号IRF3蛋白的表达(P<0.05)及其磷酸化水平(P<0.05或P>0.05),进而提高空肠中IFN-β(P<0.05或P>0.05)和IFN-γ(P<0.05)蛋白的表达。结果表明,火炭母通过调控TLR4-TBK1信号通路改善鼠伤寒沙门菌感染小鼠空肠的炎症反应。

基于LC-MS的蛇倒退抗肿瘤活性部位筛选及鉴定研究

目的:分离得到蛇倒退中抗肿瘤活性部位并鉴定。方法:通过硅胶柱色谱分离蛇倒退得到不同馏分,以SGC-7901的抑制率和IC50为指标筛选得到抗肿瘤作用最强部位,并在倒置显微镜下观察细胞形态及应用LC-MS对其进行鉴定。结果:经分离得到4个主要馏分,其中馏分1的抗肿瘤活性最强,LC-MS鉴定得到一系列化合物。结论:蛇倒退中分离得到的PEC A部位具有良好的抗肿瘤活性,其主要成分为黄酮类化合物。

萹蓄HPLC-ECD指纹图谱建立与抗氧化活性评价

目的建立萹蓄HPLC-电化学检测(ECD)指纹图谱,并评价其抗氧化活性。方法萹蓄80%甲醇提取液的分析采用XBridge BEH shield RP18色谱柱(3.0 mm×150 mm,2.5μm);流动相乙腈-9.6 mg/mL柠檬酸溶液(pH 2.74),梯度洗脱;体积流量0.6 mL/min;柱温45℃;检测电压650 mV。采用铁离子还原能力、DPPH自由基清除能力和ABTS自由基清除能力评价抗氧化活性。再对指纹图谱共有峰与抗氧化活性进行灰色关联分析、偏最小二乘回归分析。结果17批样品指纹图谱中共有26个共有峰,通过与对照品比对指认出18种化学成分,相似度在0.944~0.991之间。表儿茶素、原花青素B2、原儿茶醛、儿茶素、洋蓟素、对香豆酸、异荭草苷、杨梅苷、槲皮苷、萹蓄苷等化学成分对抗氧化活性的贡献较大。结论HPLC-ECD指纹图谱结合谱效关系研究能明确萹蓄中不同化合物对抗氧化活性的贡献程度,可为萹蓄的质量控制提供参考依据。

广西产火炭母总黄酮提取工艺优化及含量测定

采用紫外可见分光光度法测定火炭母(Polygonum chinense L.)中总黄酮的含量,以总黄酮含量为考察指标,以提取方式、提取溶剂、料液比、提取时间、提取次数为考察因素,在单因素试验的基础上,采用L9(33)正交设计优化火炭母中总黄酮的提取工艺。最优提取工艺:70%乙醇为提取溶剂,料液比1∶70(m/V),超声波提取45 min,提取2次。以芦丁为对照品,在500 nm波长处测定其吸光度,平均加样回收率为98.76%,相对标准偏差为1.72%。结果表明,13个产地火炭母药材的总黄酮含量为22.205 4~52.173 7 mg/g,相对标准偏差(RSD)为1.07%~2.81%。13个产地总黄酮含量由高到低依次为桂林市、南宁市、玉林市、百色市、贺州市、河池市、贵港市、防城港市、钦州市、梧州市、来宾市、崇左市、柳州市。该方法精密度、稳定性、重复性良好,可作为广西产火炭母药材质量评价的依据。

Investigation on the Material Basis of Sijicao Granules in Treating Eczema Based on Network Pharmacology

[Objectives]To explore the pharmacodynamic material basis of Sijicao granules for the treatment of eczema through chemical composition-network pharmacology.[Methods]First of all,the chemical constituents of Polygonum capitatum and Plantago asiatica from Sijicao granules were collected,and the relevant target information of the constituents was collected by TCMSP,PubChem,DisGeNET,GeneCards and STRING databases.Furthermore,Cytoscape 3.8.2 software was used to construct the chemical compounds-target network map of Sijicao granules.Finally,STRING database was used for PPI protein network analysis,GO functional enrichment analysis and KEGG pathway enrichment analysis of core targets,and molecular docking between core constituents and protein targets was also performed.[Results]30 constituents,including quercetin,kaempferol,luteolin,ellagic acid and gallic acid,were discovered to be the key effective compounds of Sijicao granules in the treatment of eczema.And its core action protein targets were PTGS2,NOS2,AKT1,TP53,IL6,HMOX1.What s more,through GO functional enrichment analysis of biological process(BP),cell component(CC),molecular function(MF)analysis and KEGG pathway enrichment analysis,the main pathways of action of Sijicao granules for the treatment of eczema including IL-17 signaling pathway,T cell receptor signaling pathway,cancer signaling pathway,TNF signaling pathway and Relaxin signaling pathway.In addition,molecular docking results displayed that the primary active constituents quercetin,kaempferol and luteolin were well combined with the core protein targets AKT1 and IL6.[Conclusions]Sijicao granules could play an important role for the treatment of eczema through multi-component,multi-target,multi-pathway and their interaction.

赤地利总黄酮灌胃对小鼠肝肾的影响

目的研究赤地利总黄酮对肝肾代谢的安全性及其指导用量。方法采用灌胃法连续给药15 d,摘取肝脏和肾脏称重并计算脏器系数,检验血清丙氨酸转氨酶(alanine aminotransferase,ALT)、天冬氨酸转氨酶(aspartate transaminase,AST)、血肌酐(serum screatinine,Scr)、血尿素氮(blood urea nitrogen,BUN)水平,并进行肝肾组织病理切片。结果小鼠的肝脏系数出现剂量双向性、脾脏系数发生浓度负效应;ALT、AST与对照组差异不显著,Scr与对照组间差异有统计学意义,但其浓度间差异无统计学意义,低浓度组BUN值与对照组差异显著且处理组的BUN值存在浓度正效应(P<0.05),但低于对照组,肝脏组织气球样变呈浓度正效应,肾脏组织无明显变化。结论赤地利总黄酮,口服剂量不能超过1 mg/kg。

扛板归粗多糖抗氧化、抗炎、镇痛和抑菌活性研究

目的:研究扛板归粗多糖体内外抗氧化、抗炎、镇痛和抑菌活性。方法:水提醇沉法制备扛板归粗多糖。以清除1,1-二苯基-2-三硝基苯肼(1,1-Diphenyl-2-picrylhydrazyl,DPPH)自由基、羟自由基和超氧阴离子自由基的能力为体外抗氧化评价方法,以测定总超氧化物歧化酶(Total superoxide dismutase,T-SOD)活力、过氧化氢酶(Catalase,CAT)活力和丙二醛(Malondialdehyde,MDA)含量为体内抗氧化指标,综合考察粗多糖抗氧化活性;采用二甲苯诱导小鼠耳廓肿胀法,评价粗多糖抗炎效果;测定小鼠热板痛阈值评价粗多糖镇痛作用;采用牛津杯法评价粗多糖体外抑菌效果。结果:扛板归粗多糖对DPPH自由基、羟自由基和超氧阴离子自由基具有较好的清除能力,呈剂量依懒性,半抑制浓度值(IC_(50))分别为420.93、171.53和575.40μg/mL;与对照组相比,粗多糖在体内能提高组织T-SOD活力和CAT活力,降低MDA水平。粗多糖能抑制二甲苯诱导的肿胀作用,抑制率高达40.95%。但是,该粗多糖镇痛作用不明显,对大肠埃希氏菌和金黄色葡萄球菌均无抑制作用。结论:扛板归粗多糖具有抗氧化和抗炎活性,有望开发成天然抗氧化剂。

RP-HPLC法测定火炭母药材中鞣花酸的质量分数

采用色谱柱为Welch Materials XB-C18柱(4.6 mm×250 mm,3μm),流动相为V甲醇∶V体积分数为0.2%的甲酸水溶液=45∶55,流速为0.8 mL.min-1,柱温为30℃,检测波长为357 nm.结果显示,鞣花酸对照品的峰面积与进样量在0.067～2.68μg的范围内呈良好的线性关系(r=0.999 9),该方法的平均回收率为99.6%,RSD为1.09%,测得10份样品中鞣花酸的质量分数在0.592～3.439 mg.g-1范围内.本方法快速、简便、重复性好,可用于火炭母药材中鞣花酸的含量测定.

辣蓼黄酮通过调控核因子E2相关因子2信号通路及组蛋白乙酰化缓解伪狂犬病毒感染小鼠诱导的脾脏和肺脏氧化应激

本研究通过探索辣蓼黄酮对核因子E2相关因子2(Nrf2)信号通路及组蛋白乙酰化的调控效果,以阐明辣蓼黄酮干预伪狂犬病毒(PRV)感染小鼠诱导氧化应激的分子机制。将60只无特定病原体(SPF)级昆明种小鼠,随机分为6个组(每组10只小鼠),即空白对照组、PRV组、维生素C(VC)组(灌服100 mg/kg BW VC)及辣蓼黄酮高、中、低剂量组(灌服200、100和50 mg/kg BW辣蓼黄酮混悬液),各组灌服量均为0.2 mL。PRV感染小鼠7 d后,通过荧光定量PCR测定小鼠脾脏和肺脏组织中诱导型一氧化氮合酶(iNOS)、Nrf2、血红素加氧酶-1(HO-1)、依赖还原型辅酶Ⅰ(Ⅱ)醌氧化还原酶1(NQO1)、乙酰转移酶(HAT)和去乙酰转移酶(HDAC)的mRNA表达水平;通过免疫组化和蛋白免疫印迹法(Western Blot)测定iNOS、Nrf2、HO-1、NQO1、乙酰化组蛋白H3(AcH3)和乙酰化组蛋白H4(AcH4)的蛋白表达水平。结果表明:与空白对照组相比,PRV组脾脏组织中iNOS、HAT的mRNA表达水平和AcH3的蛋白表达水平显著或极显著升高(P<0.05或P<0.01),脾脏组织中HO-1、HDAC的mRNA表达水平极显著降低(P<0.01);PRV组肺脏组织中iNOS、Nrf2、HO-1、NQO1、HAT的mRNA表达水平和iNOS、Nrf2、AcH3的蛋白表达水平显著或极显著升高(P<0.05或P<0.01),肺脏组织中AcH4的蛋白表达水平极显著降低(P<0.01)。与PRV组相比,辣蓼黄酮高、中、低剂量组脾脏组织中Nrf2、HO-1和HDAC的mRNA表达水平和AcH4的蛋白表达水平显著或极显著升高(P<0.05或P<0.01),脾脏组织中HAT的mRNA表达水平和AcH3的蛋白表达水平显著或极显著下降(P<0.05或P<0.01);辣蓼黄酮高、中、低剂量组肺脏组织中iNOS的mRNA表达水平和AcH3的蛋白表达水平显著或极显著下降(P<0.05或P<0.01),肺脏组织中AcH4的蛋白表达水平极显著升高(P<0.01)。由此可见,辣蓼黄酮对Nrf2信号通路和组蛋白乙酰化修饰具有调控作用,且其通过该调控作用缓解PRV感染小鼠脾脏和肺脏诱导的氧化应激。

NaCl胁迫对苜蓿和羊草生长与水分利用的影响

通过室内模拟试验研究了干旱土壤中NaCl胁迫对苜蓿和羊草生长和水分利用的影响。结果表明 ,在干旱土壤中 ,羊草和苜蓿株高、根长、干物质积累量、相对生长率 (RGR)和蒸散量随盐度增加显著降低。羊草生长的临界土壤溶液NaCl浓度为 2 5 3mmol/L ,临界土壤含盐量为 0 .6 0 % ;苜蓿生长的临界土壤溶液NaCl浓度为 115mmol/L ,临界土壤含盐量为 0 .33%。羊草的蒸散水分利用率 (WUEET)、钾钠吸收选择性和运输选择性在NaCl 2 5～ 2 2 5mmol/L(总盐 0 .17%～ 0 .5 3% )时 ,随盐度增加而提高 ;而在高盐条件下 (NaCl 2 75～ 32 5mmol/L ,0 .6 3%～0 .73% ) ,则随盐度的增加明显降低。当盐度超过 12 5mmol/L (总盐 >0 .34% )后 ,苜蓿的蒸散水分利用率(WUEET)随盐度水平的增加显著降低。苜蓿植株的钾钠吸收选择性和运输选择性在不同盐度处理表现不一致。

荭草花HPLC特征指纹图谱研究

目的:建立荭草花HPLC特征指纹图谱,为该药材的品质评价提供参考。方法:以花旗松素为参照物,采用HPLC法,Diamonsil C18(200 mm×4.6 mm,5μm)色谱柱;流动相为乙腈-0.1%磷酸(梯度洗脱);检测波长为280 nm;流速为1.0 mL/min;柱温为30℃。结果:12个不同产地的荭草花药材指纹图谱标定出18个共有峰,其中指认出4个共有峰,分别为花旗松素、儿茶素、没食子酸、3,3'-二甲氧基鞣花酸-4-O-β-D-葡萄糖苷。通过"中药色谱指纹图谱相似度评价系统"软件计算,12个不同产地荭草花指纹图谱相似度均大于0.9。结论:本实验方法重现性好,指纹图谱专属性强,可为荭草花药材的鉴别及质量控制提供科学依据。