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1.
本文利用环糊精修饰毛细管胶束电动色谱法(CD-MEKC)同时分离检测橙皮苷和柚皮苷对映体。实验优化的条件为:以60mmol/L胆酸钠(SC)+30mmol/L羟丙基-β-环糊精(HP-β-CD)+20 mmol/L NaH2PO4-100 mmol/L NaOH(pH=9.0,97%(V/V))+3%(V/V)甲醇为运行缓冲液,分离电压25kV,紫外检测波长214nm。在上述最佳条件下,橙皮苷和柚皮苷对映体在9min内得到完全分离,橙皮苷对映体的检测限(S/N=3)分别为0.13μg/mL和0.25μg/mL;柚皮苷对映体的检测限(S/N=3)分别为0.14μg/mL和0.07μg/mL。将所建立的方法用于胃苏颗粒制剂中橙皮苷和柚皮苷的对映体测定,回收率在86.0%~113.2%之间。 相似文献
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《理化检验(化学分册)》2010,(7)
提出了反相高效液相色谱法测定中成药风寒咳嗽颗粒中橙皮苷和柚皮苷含量的方法。采用SHIMADZU VP-ODS(4.6 mm×150 mm,5μm)色谱柱;乙-腈pH 3.5磷酸(22+78)混合溶液为流动相,流量为1.2 mL.min-1,检测波长为283 nm。待测组分与其他组分分离度良好(R值1.5),橙皮苷和柚皮苷线性范围分别为2.8~56.0 mg.L-1和0.43~8.6 mg.L-1,橙皮苷和柚皮苷的平均回收率分别为99.2%,98.7%,相对标准偏差(n=5)分别为1.2%,2.1%。 相似文献
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建立了薄层色谱-高效液相色谱-四极杆飞行时间质谱法联用技术(TLC-HPLC-QTOF-MS)快速鉴定柑橘提取物消毒液中桔皮素、蜜橘黄素、新橙皮苷和柚皮苷4种活性物质并测定其含量的方法。样品经氯仿-丙酮洗脱剂梯度洗脱,TLC检识,半制备HPLC纯化,HPLCMS/MS鉴定及HPLC含量测定。结果表明,以氯仿-丙酮(3:1,V/V)作为展开剂分离效果最好。以甲醇-水(7:3,V/V)作为流动相测定桔皮素和蜜橘黄素的含量,以甲醇-0.2%乙酸(13:7,V/V)作为流动相对柚皮苷和新橙皮苷进行定性和定量分析,分离度及峰形最佳。方法测定桔皮素、蜜橘黄素、新橙皮苷和柚皮苷含量的相关系数均大于0.999,检测限分别为:0.3,0.1,0.4,1.2μg/mL,相对标准偏差分别为1.9%,1.9%,2.2%,1.5%,平均回收率分别为97.0%,103.5%,97.8%,100.1%。方法可用于柑橘提取物消毒液质量控制。 相似文献
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提出了一种磁珠收集与液相色谱-质谱联用(LC-MS)结合用于快速筛选中药提取物中的脂肪酶抑制剂的方法. 通过制备键合脂肪酶的磁珠, 将其与枳壳总黄酮孵育后, 筛选出枳壳中脂肪酶的配体. 通过LC-MS分析发现, 4个化合物均是潜在的脂肪酶抑制剂, 鉴定其分别为柚皮苷、 新橙皮苷、 橙皮苷和枸橘苷. 对4个化合物进行了体外脂肪酶抑制活性验证. 研究结果表明, 新橙皮苷、 橙皮苷和枸橘苷具有显著的脂肪酶抑制活性, IC50分别为48.04, 52.45和46.18 μg/mL, 其中枸橘苷具有脂肪酶抑制活性为首次报道. 结果表明, 磁珠富集与LC-MS集成技术能够用于快速发现中药活性成分. 相似文献
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建立同时测定舒胆片中栀子苷、虎杖苷、柚皮苷和新橙皮苷含量的高效液相色谱法.选择Kromasil 100–5–C18柱(4.6 mm×250 mm,5μm)为分离柱,以乙腈–水为流动相,梯度洗脱,流量为1.0 mL/min,柱温为30℃,检测波长:0~13 min时为238 nm,13~17 min时为306 nm,17... 相似文献
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本文建立了新疆库鲁木提草中柚皮苷和木犀草素两种活性成分的高效液相色谱同时测定方法,并实现了野生及人工栽培库鲁木提草中柚皮苷和木犀草素的检测。采用Agilent HC-C_(18)色谱柱(250×4.6mm,5μm)分离,以甲醇-0.2%HAc水溶液作为流动相,在柱温为室温和流速1.00mL/min条件下进行梯度洗脱,实现了两种活性成分之间以及它们与干扰组分的良好分离。柚皮苷和木犀草素的线性范围分别为120~1 440mg/L(r=0.9998)和17.5~210mg/L(r=0.9999),加标回收率分别为93.8%~100.2%(RSD=1.8%~2.7%,n=3)和98.3%~100.6%(RSD=1.3%~2.9%,n=3)。研究结果表明野生库鲁木提草中柚皮苷和木犀草素的含量更高。 相似文献
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高效液相色谱法测定九味石灰华散中羟基红花黄色素A和红景天苷的含量 总被引:1,自引:0,他引:1
建立了测定中药复方制剂九味石灰华散中羟基红花黄色素A和红景天苷含量的高效液相色谱方法.采用Kromasil C18色谱柱(5μm,250 mm×4.6 mm),以乙腈∶0.1%磷酸溶液(12∶88,V/V)为流动相,流速1.0 mL/min,羟基红花黄色素A的检测波长为403 nm,红景天苷的检测波长为275 nm.羟基红花黄色素A和红景天苷分别在0.288~180μg/mL和4.8~1 200μg/mL范围内呈良好的线性关系(r值为0.999 8~0.999 9),最低检出限分别为0.03μg/mL和0.5μg/mL(S/N=3),加标回收率分别为95.7%~97.4%和95.9%~98.6%.该方法简便、准确、重现性好,可用于九味石灰华散的质量控制. 相似文献
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对同时期苹果叶和花在花开放过程中根皮苷含量动态变化进行了研究。以根皮苷含量为指标,采用HPLC法测定苹果叶和花中根皮苷含量,色谱条件:采用PUXIANG C18色谱柱(4.6 mm×5 mm,5μm),以甲醇-0.1%磷酸水溶液为流动相,梯度洗脱,进样量为20μL,流速为0.8 mL/min,检测波长270 nm,柱温30℃.根皮苷进样量在0.40~16.00μg(r=0.999 1)范围内与峰面积呈良好的线性关系;苹果叶和苹果花中根皮苷的含量大体上呈现出先增加后降低又上升的趋势,二者变化趋势基本一致,在第6天含量达到最高,最高含量分别为263.92和143.00 mg/g.在花开放过程中,对比同时期的苹果叶和苹果花中根皮苷含量,苹果叶中根皮苷含量明显高于苹果花中根皮苷含量. 相似文献
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建立高效液相色谱法同时测定止咳宁嗽胶囊中3种活性成分绿原酸、金丝桃苷和橙皮苷的方法。色谱柱为非极性固定相TC–C_(18)柱(4.6 mm×250 mm,5μm);检测波长:0~10 min为327 nm,10~48 min为280 nm;流动相为乙腈–0.2%冰乙酸溶液,线性梯度洗脱,流量为1.0 mL/min;柱温为25℃;进样体积为10μL。3种活性成分的质量浓度与其色谱峰面积均呈现良好的线性关系,线性相关系数大于0.998,绿原酸、橙皮苷、金丝桃苷的检出限分别为1,2,10 ng/mL。测定结果的相对标准偏差小于4%(n=5),样品加标回收率为94.70%~100.40%。该法操作简便,结果可靠,适用于止咳宁嗽胶囊中活性组分绿原酸、金丝桃苷和橙皮苷含量的同时测定。 相似文献
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建立了固相萃取/超高效液相色谱-四极杆飞行时间质谱(UPLC-QTOF-MS)鉴定育发化妆品中4种植物功效成分(槲皮苷、何首乌苷、芦丁和柚皮苷)的分析方法。样品采用甲醇超声提取,上清液经2%/甲酸水溶液稀释后上PAX阴离子固相萃取柱净化。以甲醇和0.002%甲酸水溶液为流动相,梯度洗脱,在CSH C18色谱柱(2.1 mm×50 mm,1.7μm,Waters)上分离,于UPLC-QTOF-MS负离子模式下进行检测。槲皮苷、何首乌苷和芦丁采用外标法定量测定;5%氨水溶液条件下,柚皮苷因在PAX上的吸附过程中结构转化为柚皮苷查尔酮,只能进行定性鉴定。在优化条件下,槲皮苷、何首乌苷和芦丁在5~200μg·L-1浓度范围内均呈良好线性,相关系数大于0.999;方法定量下限(LOQ,S/N=10)为0.03~0.1 mg·kg-1;在洗发水基质中的加标回收率为80.9%~104.7%,相对标准偏差(n=6)不大19.6%。该方法准确、适用性强,已成功应用于育发化妆品中槲皮苷、何首乌苷和芦丁的定性定量检测以及柚皮苷的定性鉴定。 相似文献
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利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
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Mustafa R. Ibrahim Zacharia A. Fataftah Paul von Ragu Schleyer Peter D. Stout 《Journal of computational chemistry》1987,8(8):1131-1138
Sets of hydrogen molecule equivalents have been developed which permit the calculation of hydrogenation of different types of carbon-carbon bonds from ab initio total energies (3-21G and 6-31G* basis sets, and, to a more limited extent, for MP2/6-31G* data) of reactants and products. The calculated enthalpies of hydrogenation are in good agreement with experiment for unstrained molecules, with average errors on the order of 2 kcal/mol. The 6-31G* equivalents allow the enthalpies for strained molecules to be calculated accurately, but the 3-21G equivalents do not. The equivalents for both basis sets have been tested by calculating the enthalpies of hydrogenation of carbon-carbon bonds in nitrogen- and oxygen-containing organic molecules, free radicals, and classical carbocations. The results are in good agreement with experiment in most cases. 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1988,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae. 相似文献
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由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献
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Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin
E. I. Kapinus V. A. Ganzha B. M. Dzhagarov E. I. Sagun V. B. Pavlenko 《Theoretical and Experimental Chemistry》1989,25(2):146-151
The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989. 相似文献