[Objectives]A high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS)method was established for the determination of 14β-receptor agonist residues in mutton.[Methods]Samples were hydrolyzed byβ-g...[Objectives]A high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS)method was established for the determination of 14β-receptor agonist residues in mutton.[Methods]Samples were hydrolyzed byβ-glucuronidase and extracted with 5%acetic acid-acetonitrile(1:99,V/V)solution.An Eclipse plus C 18 column was used for separation,and the MRM mode was used for qualitative analysis,and the external standard method was used for quantitative analysis of matrix standard solutions.[Results]Under the optimal conditions,the retention time of the 14 kinds ofβ-receptor agonists ranged from 1.0 to 9.5 min.When the mass concentration was in the range of 0.05-0.50μg/ml,the linear relationship ofβ-receptor agonists was good,with correlation coefficients(r)≥0.9992.The detection limits of the method were in the range of 0.04-0.87μg/kg,and the quantitative limits were in the range of 0.35-1.86μg/kg.The average recovery values were in the range of 82.8%-108.9%,with RSDs(n=6)in the range of 1.9%-6.7%.[Conclusions]The method is simple,sensitive,reproducible,accurate,and can be used for simultaneous determination of the 14 kinds ofβ-receptor agonist residues in mutton.展开更多
目的研究替米沙坦促进大鼠胰岛素分泌作用相关的信号通路。方法(1)分离成年Wistar大鼠胰腺获得胰岛和胰岛细胞,通过胰岛素分泌实验观察药物对胰岛素分泌的影响,通过钙成像实验和全细胞膜片钳技术观察药物对β细胞内Ca^(2+)浓度的变化和...目的研究替米沙坦促进大鼠胰岛素分泌作用相关的信号通路。方法(1)分离成年Wistar大鼠胰腺获得胰岛和胰岛细胞,通过胰岛素分泌实验观察药物对胰岛素分泌的影响,通过钙成像实验和全细胞膜片钳技术观察药物对β细胞内Ca^(2+)浓度的变化和对离子通道的作用。(2)使用过表达电压门控性钾(voltage-gated potassium channel,Kv)通道2.1亚型(Kv2.1)的慢病毒转染中国仓鼠卵巢(Chinese hamster ovary,CHO)细胞构建CHO-Kv2.1细胞系,使用膜片钳技术观察替米沙坦对Kv2.1通道的直接作用。结果缬沙坦和厄贝沙坦无类似替米沙坦的高糖浓度下促胰岛素分泌、升高β细胞内Ca^(2+)浓度和抑制β细胞的Kv通道等作用。过氧化物酶体增殖物激活受体γ(peroxisome proliferator-activated receptorγ,PPARγ)阻断剂GW9662亦未阻断替米沙坦的上述作用。而替米沙坦可以浓度依赖性地抑制CHO-Kv2.1细胞的Kv2.1通道电流。结论替米沙坦的促胰岛素分泌作用可能与血管紧张素Ⅱ-1型(angiotensin II type 1,AT-1)受体和PPARγ无关,但至少与对Kv2.1通道的直接抑制作用有关。展开更多
目的基于Meta分析评价β_(1)肾上腺素受体(ADRB1)389位点(rs 1801253)基因多态性对比索洛尔疗效的影响。方法通过计算机检索中国知网、维普网、万方数据知识服务平台、Web of Science、PubMed等数据库收集关于ADRB1与比索洛尔研究的文献...目的基于Meta分析评价β_(1)肾上腺素受体(ADRB1)389位点(rs 1801253)基因多态性对比索洛尔疗效的影响。方法通过计算机检索中国知网、维普网、万方数据知识服务平台、Web of Science、PubMed等数据库收集关于ADRB1与比索洛尔研究的文献,检索时间为建库至2023年7月。研究人员对发表的文献进行筛选,并将纳入文献进入质量评价,提取文献数据,对纳入文献结局指标使用Review Manager 5.3软件进行Meta分析。结果最终纳入文献6篇,其中Gly389Gly(GG型)69例,Gly389Arg(GC型)458例,Arg389Arg(CC型)611例。在降收缩压、舒张压及控制心率疗效方面,GG与CC基因型差异无统计学意义(P=0.96,P=0.84,P=0.87),GC与CC基因型差异无统计学意义(P=0.43,P=0.35,P=0.07),GG与GC基因型差异亦无统计学意义(P=0.60,P=0.68,P=0.77)。结论在比索洛尔降压及控制心率方面,ADRB1389位点基因多态性对其疗效影响并不明显。GG、GC及CC 3个基因型之间均未发现明显差异。展开更多
受体激动剂类药物在畜牧业中仍存在非法使用的风险,对消费者健康造成潜在威胁。本文采用液相色谱-质谱联用技术(Liquid Chromatography-Tandem Mass Spectrometry,LC-MS/MS)建立了一种检测猪肉中β-受体激动剂类药物残留的方法。样品经...受体激动剂类药物在畜牧业中仍存在非法使用的风险,对消费者健康造成潜在威胁。本文采用液相色谱-质谱联用技术(Liquid Chromatography-Tandem Mass Spectrometry,LC-MS/MS)建立了一种检测猪肉中β-受体激动剂类药物残留的方法。样品经酶解、净化、浓缩后,采用LC-MS/MS在多反应监测(Multiple Reaction Monitoring,MRM)模式下进行定性定量分析。优化后的前处理条件为甲醇-水(70∶30,v/v)作为提取溶剂,37℃β-葡萄糖醛酸苷酶水浴酶解12 h,固相萃取净化。优化后的仪器条件为采用C18色谱柱,0.1%甲酸水溶液和乙腈为流动相,梯度洗脱。4种β-受体激动剂在给定浓度范围内与响应值呈良好的线性关系,相关系数均大于0.99;日内和日间相对标准偏差均小于10%,回收率为87.9%~92.5%,基质效应值在90.4%~109.7%。该方法满足肉制品中β-受体激动剂类药物残留检测的要求。展开更多
基金Supported by The Fourth Batch of High-end Talent Project in Hebei ProvinceTangshan Science and Technology Entrepreneurship and Innovation Leading Talent Project(21130243A).
文摘[Objectives]A high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS)method was established for the determination of 14β-receptor agonist residues in mutton.[Methods]Samples were hydrolyzed byβ-glucuronidase and extracted with 5%acetic acid-acetonitrile(1:99,V/V)solution.An Eclipse plus C 18 column was used for separation,and the MRM mode was used for qualitative analysis,and the external standard method was used for quantitative analysis of matrix standard solutions.[Results]Under the optimal conditions,the retention time of the 14 kinds ofβ-receptor agonists ranged from 1.0 to 9.5 min.When the mass concentration was in the range of 0.05-0.50μg/ml,the linear relationship ofβ-receptor agonists was good,with correlation coefficients(r)≥0.9992.The detection limits of the method were in the range of 0.04-0.87μg/kg,and the quantitative limits were in the range of 0.35-1.86μg/kg.The average recovery values were in the range of 82.8%-108.9%,with RSDs(n=6)in the range of 1.9%-6.7%.[Conclusions]The method is simple,sensitive,reproducible,accurate,and can be used for simultaneous determination of the 14 kinds ofβ-receptor agonist residues in mutton.
文摘目的研究替米沙坦促进大鼠胰岛素分泌作用相关的信号通路。方法(1)分离成年Wistar大鼠胰腺获得胰岛和胰岛细胞,通过胰岛素分泌实验观察药物对胰岛素分泌的影响,通过钙成像实验和全细胞膜片钳技术观察药物对β细胞内Ca^(2+)浓度的变化和对离子通道的作用。(2)使用过表达电压门控性钾(voltage-gated potassium channel,Kv)通道2.1亚型(Kv2.1)的慢病毒转染中国仓鼠卵巢(Chinese hamster ovary,CHO)细胞构建CHO-Kv2.1细胞系,使用膜片钳技术观察替米沙坦对Kv2.1通道的直接作用。结果缬沙坦和厄贝沙坦无类似替米沙坦的高糖浓度下促胰岛素分泌、升高β细胞内Ca^(2+)浓度和抑制β细胞的Kv通道等作用。过氧化物酶体增殖物激活受体γ(peroxisome proliferator-activated receptorγ,PPARγ)阻断剂GW9662亦未阻断替米沙坦的上述作用。而替米沙坦可以浓度依赖性地抑制CHO-Kv2.1细胞的Kv2.1通道电流。结论替米沙坦的促胰岛素分泌作用可能与血管紧张素Ⅱ-1型(angiotensin II type 1,AT-1)受体和PPARγ无关,但至少与对Kv2.1通道的直接抑制作用有关。
