LC-MS/MS法同时测定犬血浆中丹酚酸A、丹酚酸B、紫草酸和迷迭香酸及其在丹参提取物的药代动力学研究应用

目的:建立同时检测Beagle犬血浆中丹酚酸A、丹酚酸B、紫草酸和迷迭香酸的分析方法,并应用混合有机溶剂萃取法提取含药血浆中的成分。方法:采用C18反相柱,流动相为甲醇乙腈等比混合液-0.1%甲酸水溶液梯度洗脱,质谱采用多反应监测(MRM)方式进行正离子检测。结果:定量分析的离子对(m/z)为:493.2/295.1(丹酚酸A),717.2/519.1(丹酚酸B),537.2/493.2(紫草酸)和359.2/161.0(迷迭香酸)。测定血浆中这4种成分的线性范围均为0.3125～200μg.L-1,定量下限为0.3125μg.L-1,该方法的精密度、准确度和稳定性均符合要求。结论:该法选择性强、灵敏度高、操作简便,可用于血浆中这4种酚酸类成分的药代动力学研究。     

吡仑帕奈片在健康受试者中的生物等效性研究

目的 考察在空腹、餐后条件下健康受试者口服吡仑帕奈片受试制剂和参比制剂体内吡仑帕奈的血药浓度和药动学参数,评价吡仑帕奈片的生物等效性和安全性。方法 采用健康受试者在空腹、餐后的单中心、单剂量、两制剂、随机、开放、两周期、自身交叉对照试验设计的人体生物等效性研究。空腹和餐后组健康受试者分别口服4 mg吡仑帕奈片受试制剂或参比制剂,采用HPLC-MS/MS法测定血浆中吡仑帕奈的浓度,药动学使用Phoenix Win Nonlin 8.1软件的非房室模型计算各受试者的药动学参数,使用SAS 9.4软件进行临床安全性统计分析。结果 空腹、餐后试验吡仑帕奈片受试试剂和参比试剂的最大血药浓度(C_max)分别为(181.20±46.14)、(168.60±47.98),(130.44±28.59)、(139.15±39.99)ng/m L,药时曲线面积(AUC_0-t)分别为(7 587.46±2 975.40)、(7 485.88±2 910.03),(7 820.54±3 229.68)、(7 528.88±2 325.94)h·ng/m L。两组吡仑帕...     

国产与进口盐酸氟西汀胶囊的人体生物等效性研究

摘 要 目的:研究国产盐酸氟西汀胶囊在人体的生物利用度,并与进口胶囊比较,评价两者生物等效性。方法: 20名健康男性志愿者随机交叉单剂量口服国产盐酸氟西汀胶囊（受试制剂）或进口盐酸氟西汀胶囊（参比制剂）20 mg后,采用液相色谱串联质谱法测定血药浓度,用DAS2.0和BAPP2.2软件计算药动学参数,并评价其生物等效性。结果:单次口服20 mg盐酸氟西汀受试制剂或参比制剂20 mg后,药动学参数分别为：C_max（12.2±4.0）和（12.5±3.6）ng·ml^-1;T_max（6.4±1.1）和（6.6±1.0）h;t_1/2（35.7±10.1）和（33.2±9.1）h;AUC_(0-144)（447.9±165.9）和（429.0±120.5）ng·h·ml^-1;AUC_(0-∞)（490.3±184.8）和（462.6±130.7）ng·h·ml^-1。经方差分析、双单侧t检验及［1-2α］%置信区间法统计分析,各药动学参数差异无统计学意义（P>0.05）。结论:国产盐酸氟西汀胶囊与进口盐酸氟西汀胶囊在人体内生物等效。     

中医治疗代谢综合征的循证思维方法

现代研究证明,胰岛素抵抗在代谢综合征的病因机制中处于中心地位。作者试图探讨中医在治疗代谢综合征中的循证思维方法。     

Herb–drug pharmacokinetic interaction between radix astragali and pioglitazone in rats

Ethnopharmacological relevance

Radix astragali (RA) was the most frequently used traditional Chinese medicine (TCM) according to the statistics on 52 anti-diabetic formulas recorded in New National Traditional Chinese Medicine; it was employed in 34 out of the 52 formulas. The aim of this study was to elucidate potential pharmacokinetic interaction between RA and pioglitazone, and to provide guidance for clinical medicine safety.

Materials and methods

A specific and rapid UPLC–MS/MS method was established to quantify pioglitazone in rat plasma. Then healthy and type 2 diabetes mellitus (T2DM) rats were each divided into control and RA decoction (RAD) administration groups—healthy, healthy-RAD, T2DM, T2DM–RAD; pharmacokinetics of pioglitazone was carried out after RAD was administrated to rats for 7 days.

Results

The established UPLC–MS/MS method was rapid, specific, and precise. Between healthy and healthy-RAD groups, half-life (T_1/2), area under the curve (AUC _0–t), Vz/F, and Cl/F showed mild yet statistically significant differences; no significant difference for any above parameter was detected between T2DM and T2DM–RAD groups.

Conclusion

RAD co-administration did not affect the pharmacokinetics of pioglitazone especially in diabetic groups; RA and pioglitazone might be feasible herb–drug co-effectiveness.     

Immunomodulatory active compounds from Tinospora cordifolia

Ethnopharmacological relevance

Tinospora cordifolia mentioned as “Rasayana” is extensively used in various herbal preparations for the treatment of different ailments for its general tonic, antiperiodic, antispasmodic, antiinflammatory, antiarthritic, antiallergic and antidiabetic properties. It is extensively used in Ayurveda due to its potential in improving the immune system and the body resistance against infections.

Aim of the study

The aim of the study was to isolate and characterise the immunomodulatory active compounds of Tinospora cordifolia.

Materials and methods

The immunomodulatory activity of different extracts, fractions and isolated compounds in relation to phagocytosis and reactive oxygen species production in human neutrophil cells have been investigated using the PMN phagocytic function studies, NBT, NO and chemiluminescence assay.

Results

The results obtained indicate that ethyl acetate, water fractions and hot water extract exhibited significant immunomodulatory activity with an increase in percentage phagocyctosis. Chromatographic purification of these fraction led to the isolation of a mixture of two compounds 2, 3 isolated for the first time from natural source and five known compounds 1, 4–7 which were characterized as 11-hydroxymustakone (2), N-methyl-2-pyrrolidone (3), N-formylannonain (1), cordifolioside A (4), magnoflorine (5), tinocordiside (6), syringin (7) by nuclear magnetic resonance (NMR) and mass spectrometry (MS) and comparing the spectral data with reported one. Cordifolioside A and syringin have been reported to possess immunomodulatory activity. Other five compounds showed significant enhancement in phagocytic activity and increase in nitric oxide and reactive oxygen species generation at concentration 0.1–2.5 μg/ml.

Conclusions

Seven immunomodulatory active compounds belonging to different classes have been isolated and characterised indicating that the immunomodulatory activity of Tinospora cordifolia may be attributed to the synergistic effect of group of compounds.     

密花石斛的HPLC/UV/MS指纹图谱研究

目的 采用HPLC／UV／MS法对密花石斛进行指纹图谱研究。方法 采用Agilent Zorbax SB—C18柱；甲醇和水为流动相进行梯度洗脱；流速为1．0mL／min。结果 得到分离度较好的密花石斛HPLC／UV指纹图谱，标示了9个共有峰，并用HPLC／MS对其部分色谱峰进行了初步定性。结论 该方法可用于密花石斛指纹图谱的测定，并为其全面质量控制提供参考。     

松脂醇二葡萄糖苷大鼠胆汁内排泄研究

[目的]建立液质联用方法,同时测定胆汁中松脂醇二葡萄糖苷和其代谢产物松脂醇单葡萄糖苷的含量,研究两者在胆汁内排泄特征。[方法]大鼠灌胃给药松脂醇二葡萄糖苷的生理盐水溶液,并按照设定的时间点收集胆汁。以华法林单体为内标,建立液质联用分析方法,测定灌胃给药后大鼠胆汁中松脂醇二葡萄糖苷和其代谢产物松脂醇单葡萄糖苷的含量变化情况。[结果]松脂醇二葡萄糖苷和松脂醇单葡萄糖苷在8~5 000 ng/m L范围内线性关系良好,日内精密度和日间精密度及其他方法学考察项RSD均符合生物样本定量要求。给药后松脂醇二葡萄糖苷和松脂醇单葡萄糖苷的累积排泄量在给药之后不断增长,到6 h后保持一个平稳状态;排泄速率在4 h时到达顶峰,之后迅速降低,6 h后保持一个较低的状态,实验后期大鼠排泄率有上升趋势。[结论]该方法符合生物样品检测要求,可用于松脂醇二葡萄糖苷和松脂醇单葡萄糖苷的同时定量测量。     

Research Techniques Made Simple: Lipidomic Analysis in Skin Research

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UPLC-Q-TOF/MS同时测定强力天麻杜仲胶囊中5种成分的含量

目的 建立UPLC-Q-TOF/MS同时测定强力天麻杜仲胶囊中天麻素、京尼平苷酸、松脂醇二葡萄苷、苯甲酰新乌头原碱及蛇床子素含量的方法。方法 采用Waters ACQUITY UPLC,色谱柱为CORTECSTM C₁₈柱（4.6 mm×150 mm,2.7 μm）,流动相为乙腈（A）-0.1%甲酸水溶液（B）梯度洗脱,电喷雾离子源（ESI）,正负离子模式,质量扫描范围为50~1 200 Da。结果 5种被测成分在线性范围内均具有良好的线性关系（r² ≥ 0.997 4）,平均回收率在99.533%~107.525%,RSD ≤ 2.56%。结论 应用UPLC-Q-TOF/MS法分离效果及重复性好,且快速、简便,可作为强力天麻杜仲胶囊的质量控制方法。