CN103951673B - 一种试剂及其在硫醇检测中的应用 - Google Patents
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Abstract
本发明提供了一种检测硫醇的试剂,它是荧光素马来酰亚胺。此试剂由荧光素胺和顺丁烯二酸酐在冰乙酸回流5小时制得,反应只需一步进行,且反应条件简单,易于生产。本发明提供了硫醇的定量检测方法,是基于荧光素马来酰亚胺,在DMSO和HEPES(pH7.0)的混合溶液中定量地检测硫醇的含量。该检测方法,对硫醇显示了高的灵敏性和选择性,检测过程简便、灵敏、快速,检测结果准确。
Description
技术领域
本发明涉及硫醇的检测技术,具体涉及一种试剂及其合成方法,以及这种试剂在检测硫醇中的应用。
背景技术
小分子硫醇谷胱甘肽(GSH)、半胱氨酸(Cys)、同型半胱氨酸(Hcy)在维持细胞氧化还原环境起着重要的作用,硫醇缺乏关系许多疾病,如儿童生长缓慢、肝损伤、艾滋病等等。然而,高浓度的硫醇会导致其他综合症,如心血管疾病、阿尔茨海默氏病等。因此发展定量检测硫醇的方法显得尤为重要。近年来,分子探针检测硫醇的方法尤为盛行,其中尤其是加成反应用于硫醇识别更为活跃,马来酰亚胺因为含有不饱和基团,能被硫醇的巯基进行亲核加成反应。在本发明中,我们选择荧光素为荧光团,马来酰亚胺为键合点,设计为硫醇的荧光探针,实现了硫醇的定量检测,且用于细胞成像。
发明内容
本发明的目的是提供一种选择性高、定量检测硫醇的新的试剂,以及该试剂在硫醇检测中的应用。
本发明提供的快速检测硫醇的试剂和方法,是基于一种荧光素马来酰亚胺,在pH为7.0的HEPES溶液和DMSO混合溶液中定量地检测硫醇的含量。该检测方法,对硫醇显示了高的灵敏性和选择性,检测过程简便、灵敏、快速,检测结果准确。
该试剂的结构式是:
该试剂的合成方法,步骤为:将荧光素胺和顺丁烯二酸酐按摩尔比1︰1完全溶解在冰乙酸中,回流5小时,停止反应;浓缩、冷却后抽滤,并用碳酸钠溶液洗涤,最后用苯重结晶得到橘黄色固体。
用该试剂检测硫醇的方法,步骤为:
(1)、配制2mM的荧光素马来酰亚胺DMSO溶液;
(2)、按体积比150:50:1,将DMSO溶液、pH7.0的HEPES水溶液、荧光素马来酰亚胺的DMSO溶液加到干净的荧光比色皿中,在荧光分光光度仪上检测,随着待测样的加入,533nm的荧光强度逐渐增强;
(3)、配制2mM的GSH蒸馏水溶液,把1.5mL的DMSO溶液、0.5mL的pH7.0的HEPES溶液、10μL的荧光素马来酰亚胺DMSO溶液加到另一个荧光比色皿中,分别在加入GSH蒸馏水溶液的体积为75、150、225、300、375、450、525、600μL时,在荧光分光光度仪上测定533nm对应的荧光强度F为133、269、389、511、629、729、834、929,以GSH浓度为横坐标,以相对荧光强度F-F0为纵坐标绘制图,F0﹦39,得到GSH浓度的工作曲线;线性回归方程为:F-F0=-59.5+2.05c,c的单位为μM;
(4)、将DMSO溶液1500μL、HEPES缓冲溶液500μL和荧光素马来酰亚胺溶液10uL加到干净的荧光比色皿中,用微量进样器吸取VμL待测样品溶液,加入到此干净的荧光比色皿中,
在荧光分光光度仪上检测,将测得的荧光强度代入步骤(3)的线性回归方程,得到浓度c,
待测样品C待测样=(2000+V待测)μL×c×10-6/VuL,即可求得GSH的浓度。
本发明具有如下优点和效果:1、合成了一种新的荧光素马来酰亚胺;2、本发明的检测方法,对硫醇显示了高的灵敏性和选择性;3、检测过程通过硫醇和马来酰亚胺的加成反应实现;4、检测手段简单,只需要借助荧光分光光度仪即可实现。
附图说明
图1a实施例1制备得到的试剂的核磁1HNMR图谱
图1b实施例1制备得到的试剂的核磁13CNMR图谱
图1c实施例1制备得到的试剂的质谱图
图2实施例2试剂与GSH作用的荧光发射图
图3实施例3试剂与各种分析物的作用的荧光发射图
图4实施例4测定GSH的工作曲线
图5实施例5细胞成像图
具体实施方式
实施例1
0.427g5-氨基荧光素和0.098g马来酸酐在10mL冰乙酸中回流5小时,冷却并抽滤,并用20mL碳酸钠饱和溶液洗涤,最后用30mL苯重结晶得到橘黄色固体即为该试剂。
1HNMR(DMSO-d6):δ10.15(s,2H),7.99(s,1H),7.78(d,J=8.0Hz,2H),7.42(d,J=7.1Hz,2H),7.28(s,2H),6.65(m,J=19.0Hz,2H),6.54(m,J=22.1Hz,2H)(图1a).13CNMR(DMSO-d6):δ169.0,167.4,159.0,151.2,150.5,134.3,132.9,128.5,126.2,124.1,121.4,112.2,108.6,82.8(图1b).元素分析(calcd.%)forC24H13NO7:C,67.45;H,3.07;N3.28,Found:C,64.46;H,3.05;N3.26.ESI-MSm/z:[试剂-H]+,426.67(图1c).
实施例2
配制pH=7.0、浓度为10mM的HEPES缓冲溶液,并用DMSO配制2mM的荧光素马来酰亚胺溶液;把0.5mL的HEPES缓冲溶液、1.5mL的DMSO溶液及10μL的荧光素马来酰亚胺DMSO溶液加到干净的荧光比色皿中,取GSH的溶液,逐渐用微量进样器加到此比色皿中,边加样边在荧光分光光度仪上检测,随着GSH的加入,533nm处荧光强度逐渐增强。荧光发射图见图2。
实施例3
配制pH=7.4、浓度为10mM的HEPES缓冲溶液,并用甲醇配制2mM的荧光素马来酰亚胺溶液;把0.5mL的HEPES缓冲溶液、1.5mL的DMSO溶液及10μL的荧光素马来酰亚胺DMSO溶液加到干净的荧光比色皿中,再分别加入60摩尔当量的GSH,Cys,Hcy,巯基乙醇(ME),巯基丙酸(MPA)以及600摩尔当量的各种分析物:Ala,Arg,Asn,Asp,Gln,Glu,Gly,His,IIe,Leu,Lys,Met,Phe,Pro,Ser,Thr,Trp,Tyr,Val在荧光分光光度仪上检测,得到荧光发射图,(见图3)。
经实验证明,其他氨基酸不干扰体系对硫醇的测定。
实施例4
配制pH=7.0、浓度为10mM的HEPES缓冲溶液,并用DMSO配制2mM的荧光素马来酰亚胺溶液,用蒸馏水配制2mM的GSH溶液;把0.5mL的HEPES缓冲溶液、1.5mL的DMSO溶液和10μL的荧光素马来酰亚胺DMSO溶液加到荧光比色皿中,分别在加入GSH溶液的体积为75、150、225、300、375、450、525、600μL时,在荧光分光光度仪上测定533nm对应的荧光强度F为133、269、389、511、629、729、834、929,以GSH浓度为横坐标,以相对荧光强度F-F0为纵坐标绘制图,F0﹦39,得到GSH浓度的工作曲线;线性回归方程为:F-F0=-59.5+2.05c,c的单位为μM;
实施例5
用DMSO配制2mM的荧光素马来酰亚胺溶液;将荧光素马来酰亚胺DMSO溶液加入肝癌细胞培养液中,使得其浓度为10μM,与肝癌细胞HepG2在37℃下,反应30min,体系在荧光共聚焦成像仪下无荧光发射;将荧光素马来酰亚胺DMSO溶液加入肝癌细胞培养液中,使得其浓度为10μM,与肝癌细胞HepG2在37℃下,反应30min,再加入外源的GSH(500μM),在37℃下,再反应30min,体系在荧光共聚焦成像仪下发出黄色的荧光。图5为荧光共聚焦成像仪下与荧光素马来酰亚胺反应的细胞a(无荧光发射)、c(a的明场)以及先荧光素马来酰亚胺作用再与外源的GSH作用的细胞b(黄色荧光)、d(b的明场)成像图。
Claims (1)
1.一种检测硫醇的方法:其特征在于,步骤为:
(1)、配制2mM的荧光素马来酰亚胺DMSO溶液;
(2)、按体积比150:50:1,将DMSO溶液、pH7.0的HEPES水溶液、荧光素马来酰亚胺的DMSO溶液加到干净的荧光比色皿中,在荧光分光光度仪上检测,随着待测样的加入,533nm的荧光强度逐渐增强;
(3)、配制2mM的GSH蒸馏水溶液,把1.5mL的DMSO溶液、0.5mL的pH7.0的HEPES溶液、10μL的荧光素马来酰亚胺DMSO溶液加到另一个荧光比色皿中,分别在加入GSH蒸馏水溶液的体积为75、150、225、300、375、450、525、600μL时,在荧光分光光度仪上测定533nm对应的荧光强度F为133、269、389、511、629、729、834、929,以GSH浓度为横坐标,以相对荧光强度F-F0为纵坐标绘制图,F0﹦39,得到GSH浓度的工作曲线;线性回归方程为:F-F0=-59.5+2.05c,c的单位为μM;
(4)、将DMSO溶液1500μL、HEPES缓冲溶液500uL和荧光素马来酰亚胺溶液10uL加到干净的荧光比色皿中,用微量进样器吸取VμL待测样品溶液,加入到此干净的荧光比色皿中,在荧光分光光度仪上检测,将测得的荧光强度代入步骤(3)的线性回归方程,得到浓度c,待测样品C待测样=(2000+V待测)μL×c×10-6/VμL,即可求得GSH的浓度。
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