CN109180716A - 一种多信号比率型区分检测h2o2和h2s的荧光探针的设计、合成及应用 - Google Patents
一种多信号比率型区分检测h2o2和h2s的荧光探针的设计、合成及应用 Download PDFInfo
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Abstract
本发明涉及的是化学分析检测技术领域,具体涉及一种多多信号比率型区分检测H2O2和H2S的荧光探针的制备方法以及该荧光探针在体外和活细胞内检测H2O2和H2S方面的应用。该探针化合物的结构式如式(I)所示。我们将两种识别基团通过染料的桥连构建到一个分子上,比率型荧光信号通过两个荧光信号的比值作为输出信号,探针分子本身的自校准能够克服诸如探针浓度、仪器灵敏度和环境因素带来的影响,提高荧光检测的准确性。通过探针与H2S和H2O2反应后获得不同组合的荧光信号来实现对H2S和H2O2的区分检测。此外该系列化合物有望在生物医药,光电以及环境保护领域有着较好的应用前景。
Description
技术领域
本发明涉及的是化学分析检测技术领域,具体涉及一种多信号比率型区分检测H2O2和H2S的荧光探针的制备方法以及该荧光探针在体外和活细胞内检测H2O2和H2S方面的应用。
背景技术
H2O2是其他活性氧的前体分子,在宿主防御,免疫应答和细胞信号传导中起着重要的作用。作为氧化应激的标志物,越来越多的研究表明,体内H2O2浓度的增加会诱导细胞蛋白的氧化损伤,导致神经退行性疾病,心血管疾病,癌症和阿尔兹海默症等。H2S作为体内的一种信号传递分子,在神经调节,细胞凋亡,抗炎症,抗氧化和抑制胰岛素信号传导等生理过程中起着广泛而重要的作用。研究发现,H2S通过提高细胞内谷胱甘肽的水平、调节抗氧化蛋白的高表达等途径,来保护细胞免受氧化应激的损伤。H2S本身具有的还原性也会直接清除H2O2等活性氧物质。H2S和H2O2在生理过程中有如此重要的作用,同时彼此互相影响,开发一种有效的检测方法是至关重要的,特别是对细胞内H2S和H2O2的浓度的监测,对生物学研究和临床诊断至关重要。
目前对H2S和H2O2的检测方法主要有比色法、电化学分析法、气相色谱法、滴定法、分光光度法和荧光法等。在这些方法中,荧光探针成像技术由于操作简单,灵敏度高,选择性好,实时成像等优点,特别是对组织的非破坏性而受到特别的关注。近年来开发了大量的荧光探针来检测H2S和H2O2,但他们都是独立的对H2S或H2O2进行选择性检测,还没有一个探针分子可以同时区分检测H2S和H2O2。
发明内容
本发明目的之一是提供一种合成路线简单、反应条件温和、成本较低的荧光探针合成方法;目的之二是提供一种灵敏度高、选择性好,抗干扰能力强,斯托克斯位移大,发射波长在近红外,能够对体外或者活细胞内进行监测或者细胞成像的荧光探针。比率型荧光信号通过两个荧光信号的比值作为输出信号,探针分子本身的自校准能够克服诸如探针浓度、仪器灵敏度和环境因素带来的影响,提高荧光检测的准确性。通过探针与H2S和H2O2反应后获得不同组合的荧光信号来实现对H2S和H2O2的区分检测。
本发明解决问题采取的技术方案为,一种多信号比率型区分检测H2O2和H2S的荧光探针,其分子结构式如下:合成路线如下:
具体合成方法如下:将化合物(7-羟基-2-氧代-2H-色烯-4-基)甲基(E)-3-(7-((4- 叠氮苯基)氧基)-1,4-二乙基-1,2,3,4-四氢喹喔啉-6-基)-2-氰基丙烯酸酯和4-溴甲基苯硼酸频哪醇酯溶于丙酮,置于圆底烧瓶中,加入碳酸钾60℃搅拌回流反应。TLC监测反应完成后,停止反应,减压蒸馏除去溶剂,剩余物用柱层析分离纯化,二氯甲烷/乙酸乙酯(v:v =20:1,含1%三乙胺)作为洗脱剂。干燥得到红色固体
本发明的荧光探针测试方法如下,将探针分子溶于二甲基亚砜(DMSO)中,配制成1.0×10-3mol/L的溶液,室温下进行测试。并且对低浓度的H2S和H2O2可以进行定量检测,具体实施方法在实施实例中详细介绍。
本发明的荧光探针的作用机理如下,在探针分子中,探针本身发蓝色荧光,且有两个反应位点。当探针与H2S反应时,位点1的叠氮基被还原,随后醚键被切断,经过快速的分子内成环反应得到发蓝色荧光的HCB和发红色荧光的TQC。当探针TCAB与H2O2反应时,位点2的醚键被切断,释放出发蓝绿色荧光的化合物TCA,探针的荧光发生了从蓝光到蓝绿色的比值变化。通过探针TCAB与H2S和H2O2反应得到不同的荧光信号:H2S(蓝光+红光), H2O2(蓝光→蓝绿光),可以实现对H2S和H2O2的区分检测。随后,我们进一步研究了探针与两种响应物叠加响应的情况。当向探针TCAB与H2S响应后的溶液中继续加入H2O2时,前一步的产物HCB上的苯硼酸酯会继续被H2O2切断,从而释放出蓝绿色的荧光染料HC,同时之前得到的红光染料TQC不受影响。同样的,向探针TCAB与H2O2响应后的溶液中继续加入H2S时,TCA上的叠氮基会继续被H2S还原,醚键断裂,再经过快速的分子内成环反应得到发蓝绿色荧光的染料HC和发红色荧光的染料TQC。由此可见,探针TCAB可以实现对H2S和H2O2的连续检测。
探针分子的响应过程:
本发明的荧光探针探针TCAB与H2S和H2O2的荧光响应测试在HEPES缓冲液(20 mM,1.0mM CTAB,pH=7.4)中进行。探针本身在413nm处发蓝色荧光。当探针TCAB的溶液中加入H2O2时,413nm处的荧光下降,同时在486nm处有新的蓝绿色荧光生成(激发波长为325nm)。荧光滴定实验结果显示,随着H2O2浓度的增大,486nm处的荧光强度(F486nm) 与413nm处的荧光强度(F413nm)的比值显著增大,当H2O2浓度达到400μM时,F486nm/F413nm的值达到最大。并且F486nm/F413nm的值与H2O2的浓度在20-100μM范围内有很好的线性关系,线性相关系数为0.9968。另外,当探针TCAB与H2S响应时,反应液在413nm处的蓝色荧光增强(激发波长为325nm),同时在627nm处有新的红色荧光生成(激发波长为475 nm)。随着H2S浓度的增加,反应体系在413nm和627nm处的荧光强度逐渐增强,在350μM 的H2S加入时,荧光强度达到最大值。并且探针TCAB在413nm和627nm处的荧光强度与 H2S在浓度范围为0-150μM时具有很好的线性关系,线性相关系数分别为0.9905和0.9901。根据信噪比S/N=3,计算出探针TCAB对H2S和H2O2的检测限分别为0.058和0.044μM。随后,我们还测定了探针TCAB与H2S和H2O2响应前后的紫外光谱变化情况
本发明所述的探针分子合成路线简单,成本较低,对H2S和H2O2的选择性好、抗干扰能力强,斯托克位移大,该荧光探针在生物化学,环境科学等领域具有实际的应用价值。
附图说明
图1为本发明荧光探针TCAB(10.0μM)在HEPES缓冲液(20mM,1.0mM CTAB, pH=7.4)中与H2O2(400μM)和H2S(350μM)响应前后的紫外吸收光谱。
图2(A-B)探针TCAB(10.0μM)与H2O2完全反应后的溶液随H2S浓度增加的荧光光谱变化。(C-D)探针TCAB(10.0μM)与H2S完全反应后的溶液随H2O2浓度增加的荧光光谱变化。激发波长:第一列325nm;第二列475nm。激发和发射狭缝宽度为5nm/5nm。
图3为本发明的荧光探针TCAB(10.0μM)在HEPES缓冲液(20mM,1.0mM CTAB, pH=7.4)中与H2O2(400μM)和H2S(350μM)响应时,F486nm/F413nm的比值以及413nm和627 nm处的荧光强度随时间的变化。激发波长:(A)325nm,(B)325nm,(C)475nm。
图4为本发明的荧光探针TCAB(10.0μM)在HEPES缓冲液(20mM,1.0mM CTAB, pH=7.4)中与相关分析物响应后,F486nm/F413nm的比值以及413nm和627nm处的荧光强度变化。分析物包括:(1)ROO.,(2)NO.,(3)ClO-,(4)O2 -,(5)TBHP,(6)TBO.,(7)ONOO-,(8)1O2,(9) OH-,(10)SO4 2-,(11)NO3 -,(12)SCN-,(13)Cl-,(14)CO3 2-,(15)SO3 2-,(16)N3 -,(17)AcO-,(18) Na+,(19)Mg2+,(20)Ca2+,(21)K+,(22)Fe3+,(23)Cys,(24)GSH,(25)H2O2,(26)H2S。浓度: (1)-(25)400μM,(26)350μM,激发波长:(A)325nm,(B)325nm,(C)475nm。
图5为高效液相色谱:(a)探针TCAB(50.0μM);(b,c,d)探针TCAB(50.0μM)分别与10.0,20.0和40.0equiv.的H2O2在HEPES缓冲液(20mM,1.0mM CTAB,pH=7.4)中响应 120分钟;(e)化合物TCA(50.0μM).流动相:H2O/CH3CN(v/v,2/8);流速:0.5mL/min;温度: 25℃;检测波长:350nm。
图6高效液相色谱:(a)探针TCAB(50.0μM);(b,c,d)探针TCAB(50.0μM)分别与10.0,20.0和40.0equiv.的H2S在HEPES缓冲液(20mM,1.0mM CTAB,pH=7.4)中响应80 分钟;(e)化合物TQC(50.0μM);(f)化合物HCB(50.0μM).流动相:H2O/CH3CN(v/v,2/8);流速:0.5mL/min;温度:25℃;检测波长:350nm。
图7为本发明的荧光探针TCAB(10.0μM)在不同pH环境下与H2S和H2O2的响应情况。荧光强度:(a)F486nm/F413nm,(b)413nm,(c)627nm;激发波长:(a)325nm,(b)325nm,(c)475nm。
图8不同浓度的探针TCAB对HeLa细胞毒性的分析。
图9探针TCAB在HeLa细胞内对外源性H2O2和H2S的共聚焦荧光成像。(A)细胞先与500μM H2O2孵育30分钟,再与10μM探针TCAB孵育30分钟。(B)细胞先与500μM H2S孵育30分钟,再与10μM探针TCAB孵育30分钟。(C)细胞先与10μM探针TCAB 孵育30分钟,再与500μMH2O2孵育30分钟,最后与500μM H2S孵育30分钟。(D)细胞与10μM探针TCAB孵育30分钟。第一列:蓝光通道,激发波长405nm,收集范围420-450 nm;第二列:蓝绿光通道,激发波长405nm,收集范围460-510nm;第三列:红光通道,激发波长488nm,收集范围600-650nm;第四列:合并蓝光,蓝绿光和红光通道。
具体实施实例
本发明的探针分子结构式如下:
本发明的探针合成路线如下所示;
实施例1:探针的合成;
英文名称:
(2-oxo-7-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)oxy)-2H-chromen-4-yl)methyl (E)-3-(7-((4-azidobenzyl)oxy)-1,4-diethyl-1,2,3,4-tetrahydroquinoxalin-6-yl)-2-cyanoacrylate
中文名称:(2-氧代-7-((4-(4,4,5,5-四甲基-1,3,2-二氧杂环戊烷-2-基)苄基)氧基)-2H-色烯-4-基)甲基(E)-3-(7-((4-叠氮苯甲酰)氧基)-1,4-二乙基-1,2,3, 4-四氢喹喔啉-6-基)-2-氰基丙烯酸酯
结构式:
合成方法:将化合物TCA(60mg,0.1mmol)和4-溴甲基苯硼酸频哪醇酯(60mg,0.2mmol)溶于10mL丙酮,置于25mL圆底烧瓶中,加入碳酸钾(28mg,0.2mmol),60℃搅拌回流反应3h。TLC监测反应完成后,停止反应,减压蒸馏除去溶剂,剩余物用柱层析分离纯化,二氯甲烷/乙酸乙酯(v:v=20:1,含1%三乙胺)作为洗脱剂。干燥得到红色固体35mg,产率为43%。表征数据:HRMS(ESI)m/z:[M]calcd for C46H47BN6O8,822.3548;found,822.3605. 1HNMR(400MHz,CDCl3)δ8.69(s,1H),7.76(s,1H),7.49(d,J=8.8Hz,1H),7.45–7.39(m, 4H),7.37(d,J=7.8Hz,2H),7.03(d,J=8.4Hz,2H),6.94(dd,J=8.8,2.4Hz,1H),6.89(d,J=2.3Hz,1H),6.42(s,1H),5.99(s,1H),5.41(s,2H),5.12(d,J=23.9Hz,4H),3.56(s,2H),3.36(d, J=6.2Hz,4H),3.21(s,2H),1.35(t,12H),1.26(q,J=3.2Hz,6H).13C NMR(100MHz,CDCl3)δ 164.6,161.8,160.8,156.7,155.5,149.2,147.8,144.4,144.0,140.0,138.8,135.1,133.3,128.7, 126.6,126.1,124.7,119.4,118.4,113.2,111.0,110.4,109.9,102.4,94.2,83.9,70.8,70.4,65.3, 61.9,53.4,48.0,45.4,29.7,24.9,10.9,9.8.
实施例2:细胞培养和荧光成像;
HeLa细胞(人宫颈癌细胞)来源于湖南大学化学生物传感与计量学国家重点实验室。 HeLa细胞培养在含10%的胎牛血清和1%的盘尼西林的DMEM培养液中,在37℃和5%二氧化碳条件下培养24h。然后接种到激光共聚焦培养皿中,继续孵育12h,待细胞贴壁后可进行荧光成像实验。
外源性H2S和H2O2的检测。实验组一和二:首先移除培养基,PBS缓冲液漂洗细胞三次,向培养皿中加入500μM的Na2S或H2O2,细胞在37℃和5%二氧化碳条件下培养 30分钟,然后用PBS缓冲液漂洗细胞三次,将探针TCAB(10μM)加入到培养皿中,与细胞孵育30分钟,PBS漂洗后进行荧光成像;实验组三:移除培养基,PBS缓冲液漂洗细胞三次,将探针TCAB(10μM)加入到培养皿中,与细胞孵育30分钟,PBS缓冲液漂洗细胞三次,然后向培养皿中加入500μM的Na2S,与细胞孵育30分钟,用PBS缓冲液漂洗细胞三次,然后向培养皿中加入500μM的H2O2,继续与细胞孵育30分钟,PBS漂洗后进行荧光成像。对照组:移除培养基,PBS缓冲液漂洗细胞三次,将探针TCAB(10μM)加入到培养皿中,在 37℃和5%二氧化碳条件下与细胞孵育30分钟,PBS漂洗后进行荧光成像。
内源性H2S和H2O2的检测。实验组一:移除培养基,PBS缓冲液漂洗细胞三次,向培养皿中加入佛波酯(PMA,1μg/mL),细胞孵育30分钟后用PBS缓冲液漂洗三次,将探针 TCAB(10μM)加入到培养皿中,与细胞孵育30分钟,PBS漂洗后进行荧光成像;实验组二:移除培养基,PBS缓冲液漂洗细胞三次,向培养皿中加入硝普钠(SNP,100μM),细胞孵育 30分钟后用PBS缓冲液漂洗三次,将探针TCAB(10μM)加入到培养皿中,与细胞孵育30 分钟,PBS漂洗后进行荧光成像;对照组:移除培养基,PBS缓冲液漂洗细胞三次,将探针 TCAB(10μM)加入到培养皿中,在37℃和5%二氧化碳条件下与细胞孵育30分钟,PBS 漂洗后进行荧光成像。
Claims (1)
1.一种多信号比率型区分检测H2O2和H2S的荧光探针,其结构如式(I)所示;
其特征在于该荧光探针用于环境或生物样品中的H2O2和H2S的荧光检测和分析。
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CN113896739A (zh) * | 2021-08-26 | 2022-01-07 | 福建师范大学 | 一种反应性罗丹明b衍生物荧光探针及其制备方法和应用 |
CN113896739B (zh) * | 2021-08-26 | 2023-09-22 | 福建师范大学 | 一种反应性罗丹明b衍生物荧光探针及其制备方法和应用 |
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