HPLC测定生脉注射液中4种成分的含量

目的:建立同时测定生脉注射液(红参、麦冬、五味子)中4种成分含量的方法。方法:采用HPLC法同时测定生脉注射液中的4种主要成分:人参皂苷Rg1、人参皂苷Re、人参皂苷Rb1和五味子醇甲的含量,以Waters symmetryshieldTMRP18(4.6mm×250mm;5.0μm)色谱柱为分析柱,以乙腈-水为流动相;检测波长为203nm。结果:本色谱条件下人参皂苷Rg1、人参皂苷Re、人参皂苷Rb1和五味子醇甲之间有良好的分离度,4种成分的浓度和各自峰面积之间有着良好的线性关系,精密度、重现性及加样回收率的相对标准误差均小于1。结论:本方法可同时测定生脉注射液中的4种成分,可作为生脉注射液的质量控制手段。     

超高效液相色谱-串联质谱法同时检测食品中30种食品添加剂

目的 建立食品中30种食品添加剂同时检测的超高效液相色谱-串联质谱法.方法 样品经甲醇-乙腈-水(1∶1∶1,V/V/V)溶液提取,离心,超高效液相色谱-串联质谱仪测定,外标法定量.结果 在0.05 mg/kg～1.0 mg/kg线性内,各物质线性相关系数均＞0.99.酸性红、诱惑红、喹啉黄、专利蓝、纳他霉素、对羟基苯...     

全氟辛烷磺酸对大鼠仔鼠学习记忆能力的影响

Objective To study the effects of prenatal and postnatal perfluorooetane sulfonate (PFOS) exposure on spatial learning and memory, N-methyl-D-aspartate receptor 2B (NR2B) mRNA and protein level in frontal cortex and hippoeampus of rat pups and to explore the mechanism of developmental neurotoxicity induced by PFOS. Methods Twenty-eight pregnant mrs were randomly divided into three groups in proportion of 3: 2: 2,including control group (C), low dose group (L) and high dose group (H) by means of randomized number table, which respectively received 0,7.2, 14.4 mg/kg PFOS feed from pregnancy day 0 to postnatal day(PND)30 by free feedings. The animal models of prenatal and postnatal non-exposure (CC), prenatal exposure (LC and HC), postnatal exposure (CL and CH), and prenatal and postnatal exposure (LL and HH) to PFOS were established by cross-fostering method. The spatial learning and memory were measured by water maze experiment,the NR2B mRNA levels in frontal cortex of rat pups was determined with semi-quantitative RT-PCR, NR2B protein express in cerebral cortex (frontal and tempera]cortex) and hippocampus (CAI, CA3, CA4 and DG regions) of rat pups was detected by immunohistochemistry. Results The escape latency of CL, CH, LL and HH groups pups in water maze experiment were (99. 83±25.77) s, (111.30±17. 82) s, (106. 40±18. 71) s, (107.70±16. 85) s, and longer as compared with CC group[(54.90±26.69)s](q value were 4.349,4.773,6.026 and 5.641, respectively,P<0. 01). The number of errors of HH group rat pups entering dead end was (22. 30±7.56) at the training day 4,and it was significantly higher than that of CC group (9. 80±4. 64) (q=5. 173,P<0. 01). The NR2B mRNA levels of frontal cortex of pups in HC group at PND1 ,and LC group, HC group and HH group at PND14 were (0. 167±0. 008), (0. 364±0. 035), (0. 341±0. 030) and (0. 328±0. 045) respectively,which were significantly lower than CC group (0.271±0.060) and (0.465±0.067) (q values were 3. 547, 3. 739, 4. 597 and 5. 006, respectively, P<0.05) . The results of immunohistochemistry indicated that NR2B protein express of the hippocampus CA1 region of pups in LC group was (0.091±0.005),and showed significant lower than CC group which was (0. 123±0.009) at PND1 (q=5. 209 ,P<0. 05). At PND14, the effect of PFOS extended to cerebral cortex and hippocampus regions. At PND28, the effects of PFOS were showed in hippocampus CA1, CA3 and temporal cortex regions. Conclusion Prenatal and postnatal exposure to PFOS should result in the spatial learning and memory damage,and the mechanism might be possibly involved in the decrease of NR2B level in cerebra lcortex and hippocampal formation regions.     

喜欢“窥视”隐私 是何心理作怪

每人都有保护自己隐私的权利。隐私就是人出于个人尊严和其他某些方面的考虑而不愿意公开,不希望外人了解或是打听的个人秘密、私人事宜。“不愿告人”和“不愿公开”自然有他的原因。保留隐私与为人诚实并不矛盾,就像善良的谎言与委婉的诚实并不矛盾一样。     

血小板源性生长因子受体样蛋白对结肠癌CT-26细胞增殖和迁移的影响

目的 探究小鼠血小板源性生长因子受体样蛋白(PDGFRL)对结肠癌细胞CT-26增殖和迁移的影响.方法 调取小鼠PDGFRL基因并表达全长蛋白及两个结构域蛋白.利用磺酰罗丹明B法(SRB)、流式细胞术和损伤-修复实验检测PDGFRL全长蛋白及两个结构域蛋白对小鼠结肠癌CT-26细胞系增殖、迁移、凋亡及细胞周期的影响.结果 PDGFRL全长蛋白及两个结构域对CT-26细胞增殖有明显的抑制作用,促进细胞凋亡,并阻滞细胞周期于G2/M期.尤以结构域Ⅱ效果最为显著.此外,PDGFRL全长蛋白可抑制CT-26细胞的迁移,而两个结构域蛋白对细胞迁移无明显影响.结论 PDGFRL蛋白能有效抑制CT-26细胞增殖,在促进细胞凋亡过程中,结构域Ⅱ可能发挥重要作用.     

GC测定灵芝中24种有机磷农药残留量

 目的研究灵芝中24种有机磷农药残留量的测定方法。方法样品经冰浴超声提取,凝胶渗透色谱(GPC)净化后,采用不分流进样,用双柱双火焰光度检测器(FPD)气相色谱同时定性、定量测定。结果样品3水平添加时的24种有机磷农药回收率均在75.28%～117.18%,相对标准偏差在3.19%～15.57%,符合农药残留分析的要求。结论本法净化效果好,重现性好,可用于灵芝中24种有机磷农药残留量的检测。     

大黄素对膝骨关节炎大鼠软骨细胞铁死亡的影响及机制研究

目的 探讨大黄素对膝骨关节炎(KOA)大鼠软骨细胞铁死亡的影响及其机制。方法 96只SD大鼠分为假手术(Sham)组、KOA组、大黄素(EMO)组、大黄素+Nrf2抑制剂(EMO+ML385)组,每组24只,除Sham组外,其余组均采用改良Hulth法构建KOA模型。酶联免疫吸附试验(ELISA)检测血清肿瘤坏死因子-α(TNF-α)、一氧化氮(NO)、前列腺素E2(PGE2)水平;肉眼观察膝关节大体形态;番红O-固绿染色观察膝关节软骨组织病理形态学;原位末端标记(TUNEL)染色检测膝关节软骨细胞凋亡率;生化试剂盒检测膝关节软骨组织中丙二醛(MDA)、活性氧(ROS)、谷胱甘肽(GSH)、亚铁离子(Fe²⁺)水平;实时荧光定量PCR(qRT-PCR)、蛋白免疫印迹或免疫组化检测膝关节软骨组织中基质金属蛋白酶(MMP)-3、MMP-13、Ⅱ型胶原α1(COL2A1)、前列腺素内过氧化物合酶2(PTGS2)、谷胱甘肽过氧化物酶4(GPX4)、长链脂酰辅酶A合成酶4(ACSL4)、核因子E2相关因子2(Nrf2)、血红素加氧酶-1(HO-1)mRNA或蛋白表达。结果 ...     

原发性痛经患者疼痛共情相关功能MRI研究

目的 采用功能MRI方法观察原发性痛经(PDM)患者疼痛共情能力及中枢改变特点.方法 筛选符合条件被试分别作为痛经组及健康对照(HC)组,视觉模拟量表(VAS)评价月经前期及月经期痛经强度,通过3.0T MR对2组被试进行疼痛共情任务态功能MRI扫描,采用VAS记录疼痛共情程度.针对FSL软件包数据处理所得参数,利用重...     

气相色谱串联质谱法同时测定黄芪中238种农药残留

 目的 采用气相色谱-串联质谱法建立黄芪中农药多残留的测定方法。方法 样品经改良后QuEChERS方法提取,采用氨丙基固相萃取小柱净化,并采用气相色谱-串联质谱同时定性、定量测定。结果 对黄芪进行了3个添加水平的回收实验,结果表明238种农药的回收率大多在70.0％～120.0％,相对标准偏差小于15％,检测限大多低于0.01 mg·kg^-1。结论 本法操作简单,净化效果好,灵敏度高,重现性好,可用于黄芪样品中农药多残留的日常检测。