Quantitative analysis of five compounds in gallnut lotion by UPLC-MS/MS / 药学实践杂志

Objective To develop an ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method to simultaneously detect the contents of gallic acid, syringin, phellodendrine, aesculin and rhein in the gallnut lotion. Methods An UPLC- MS/MS method was established. Separation was performed on an Agilent Poroshell 120 EC-C18(2.1 mm×150 mm, 2.7 μm)with a gradient mobile phase system of 0.2% formic water-acetonitrile solution. The flow rate was 0.3 ml/min. The temperature of column was 30 ℃. The injection volume was 2 μl. The MS detection was in dynamic MRM mode. Results gallic acid, syringin, phellodendrine, aesculin and rhein were successfully separated using this method, with good linear relationship as the ranges of 153.8-15380、10.31-1031、5.265-526.5、50.70-5070、1.054-105.4 ng/ml, respectively. The precision, repeatability, stability and recovery were good. Conclusion This UPLC-MS/MS method is stable, rapid, and reproducible., It is suitable for detecting the contents of gallic acid, syringin, phellodendrine, esculetin and in the gallnut lotion.

Determination of propylthiouracil in human plasma by UPLC-MS/MS / 药学实践杂志

Objective To establish a method for the determination of propylthiouracil in human plasma by UPLC-MS/MS and provide methodological basis for therapeutic drug monitoring (TDM) and bioequivalence test (BE) in clinical. Methods The chromatographic separation was performed on an Agilent SB-C18 column (4.6 mm×150 mm, 5 μm), the mobile phase was methanol and water containing 0.1% formic acid (80∶20, V/V), isocratic elution. MS condition was optimized in the positive ion detection mode by multiple reaction monitoring (MRM), along with the Agilent JetStream electrospray source interface (AJS-ESI). The precursors to the product ion transitions were m/z 171.1→112.1 for propylthiouracil and m/z 176.1→117.0 for the internal standard (IS). Results The calibration curve was linear in the range of 10−5 000 ng/ml for propylthiouracil in human plasma, r=0.999 3. The intra-day and inter-day precision and accuracy were good (RSD<10%，RE<±10%). The matrix effect of different concentrations was less than 110% and the coefficient of variation was less than 5%. The average recovery of different concentrations was 101.60%−113.56%, which conformed with the requirement of methodological validation. Conclusion The method is rapid, sensitive and accurate, which can be used for the determination of propylthiouracil in human plasma.

Inhibition of ebracteolatain A in the proliferation of breast cancer cells by interfering with PKD1-mediated MEK/ERK and PI3K/AKT signaling pathways / 药学实践杂志

Objective Breast cancer is one of the deadliest malignancies in the world. ebracteolatain A (EA) is a kind of acetylphloroglucinol extracted from ebracteolatain. To explore the specific mechanism of EA inhibiting the proliferation of breast cancer cell MCF-7, so as to provide a new approach for the clinical treatment of breast cancer. Methods EA with different concentrations were added to breast cancer cell MCF-7 to detect changes in PKD1 protein expression. The plasmid with overexpressed PKD1 was constructed and transfected into cells, and the mRNA and protein expression levels of PKD1 were detected by real-time fluorescence quantitative PCR and Western Blot assay. CCK-8 assay was used to detect changes in cell proliferation capacity. Western Blot assay was used to detect the expression level of PKD1 and its related signaling pathways. Results EA inhibited the expression of PKD1 protein in breast cancer cells with a dose-dependent manner (P< 0.05). When transfected with the overexpressed plasmid, PKD1 was significantly increased in mRNA and protein levels (P<0.001). At the same time, PKD1 overexpression significantly reversed inhibition of EA on MCF-7 proliferation (P<0.001). It was confirmed by signaling pathway analysis that EA might affect the proliferation ability of breast cancer cells by inhibiting PKD1-mediated MEK/ERK and PI3K/AKT signaling activity (P<0.05). Conclusion EA could inhibit the proliferation of breast cancer cells by regulating PKD1-mediated MEK/ERK and PI3K/AKT signaling pathways.

Exploration of the method of testing total cell volume / 中国实用护理杂志

Objective To explore the influence of different testing methods on detecting value of to-tal cell volume. Methods 60 reusable dialyzers(low-flux dialyzer and high-flux dialyzer were 30 respec-tively) were enrolled. They were divided into the traditional testing group, the modified testing group and the automatic dialyzer reuse group with 20 dialyzers in each group according to different detecting methods, the results underwent analysis. Results The basic total cell volume of the traditional testing group, the modified testing group and the automatic dialyzer reuse group were (100.10±0.25) ml, (100.13±0.50) ml and (102.00±1.41) ml in 6LR dialyzer, while in 17R dialyzer, they were (113.67±1.30) ml, (118.67±1.30) ml and (119.93±1.77)ml respectively. The total cell volume of the dialyzer reuse in the traditional testing group, the modified testing group and the automatic dialyzer reuse group were (95.20±7.76) ml, (96.20± 7.22) ml and (102.80±4.26) ml in 6LR dialyzer, while in 17R dialyzer, they were (100.00±11.48) ml, (114.35±3.31 ) ml and (117.07±2.96) ml respectively. There was significant difference between the tradi-tional and the modified testing groups in high-flux dialyzers reuse. Conclusions The modified testing method can improve the accuracy of the testing of total cell volume in high-flux dialyzer reuse.