CN109096180B - 一种基于4-苯乙烯吡啶盐长波发射识别h2s荧光探针及其合成方法和应用 - Google Patents

一种基于4-苯乙烯吡啶盐长波发射识别h2s荧光探针及其合成方法和应用 Download PDF

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CN109096180B
CN109096180B CN201811100389.1A CN201811100389A CN109096180B CN 109096180 B CN109096180 B CN 109096180B CN 201811100389 A CN201811100389 A CN 201811100389A CN 109096180 B CN109096180 B CN 109096180B
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钟克利
汤立军
曲秀莉
侯淑华
任欢欢
李秋莹
徐永霞
边延江
周诗怡
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Abstract

一种基于4‑苯乙烯吡啶盐长波发射识别H2S荧光探针及其合成方法和应用,其结构式如下:
Figure DDA0001806530810000011
制备方法是:以乙醇为溶剂,4‑(二乙氨基)水杨醛、4‑甲基吡啶盐、哌啶进行投料,加热回流反应,旋出溶剂,粗产物用硅胶柱色谱法进行纯化,用甲醇和二氯甲烷作为洗脱剂进行分离,得到化合物1。以DMF为溶剂,将化合物1、2,4‑二硝基氟苯、碳酸钾进行投料,室温下搅拌,过滤得到粗产物,用硅胶柱色谱法进行纯化,用洗脱剂进行分离,得到荧光探针L。优点是:合成步骤简单,分离提纯容易;荧光探针可以在水介质中、长波发射荧光增强识别H2S,具有良好的选择性、较高的灵敏度和较好的抗干扰能力,并可应用到实际水样中检测H2S。

Description

一种基于4-苯乙烯吡啶盐长波发射识别H2S荧光探针及其合 成方法和应用
技术领域
本发明涉及一种基于4-苯乙烯吡啶盐长波发射识别H2S荧光探针及其合成方法和应用。
背景技术
氢化硫化氢(H2S)是一种新发现的气态信号分子,由于其在生理和病理过程中具有多种功能,已成为生物学领域的研究热点。H2S主要来自火山喷发和哺乳动物细胞自身通过胱硫醚 -β-合成酶(CBS),胱硫醚-γ-裂解酶(CSE),3-巯基丙酮酸硫基转移酶(3-MST)等酶的作用产生的。以往的研究表明,H2S在调节血压,心血管保护,调节细胞生长和刺激血管生成等方面起重要作用。此外,生命体系中高水平的H2S会引起人类疾病,如阿尔茨海默病,唐氏综合症,高血压和肝硬化等。鉴于H2S的生物学重要性,科学家们需要精确的方法来检测H2S,目前最常见的经典方法包括电化学法、比色法、亚甲蓝法和气相色谱法。与传统方法相比,荧光分析技术以其成本低、操作简单、灵敏度高、实时无损生物成像等优点受到人们的广泛关注。
近年来,设计识别H2S的荧光探针已有很多报道,如Anal.Chem.,(2017),89,4578-4594; Anal.Chem.,(2018),90,7510-7516;Anal.Chem.,(2015),87,1188-1195;J.Org.Chem.,(2017), 82,10234-10246;Anal.Chem.,(2016),88,592-595;RSC Adv.,(2016),6,56384-56391;Chem. Soc.Rev,(2013),42,3489-3613;Analyst,(2014),139,3373-3377;RSC Adv.,(2013),3, 14543-14548,但这些文献都是对多种阴离子的检测,没有实现对H2S的专一性识别。Anal. Chem.,(2018),90,7510-7516;Anal.Chem.,(2015),87,1188-1195;J.Org.Chem.,(2017),82, 10234-10246;Chem.Commun.,(2012),48,10871-10837;Anal.Chem.,(2013),85,7875-7881,这些文献虽然能专一性识别H2S,但是发射波长较短,不能在长波长区域检测,而且合成路线复杂,响应时间长。众所周知,在可见光谱区,生物样品有较强的背景荧光和自吸收,会给检测与成像带来干扰,影响测量的准确性。同时,可见光的波长较短,在荧光成像时辐射能量较大,易造成细胞和生物组织的光损伤。因此,开发合成简单,发射波长在长波长区域(600nm -900nm)可克服以上不足,这对设计合成更为简便优越的H2S荧光探针具有重要意义。
发明内容
本发明要解决的技术问题是提供一种长波发射识别H2S荧光探针及其合成方法和应用,该荧光探针具有较长的发射波长,响应时间较短,可在水介质中实现对H2S的识别,具有特异选择性、较高的灵敏度和较好的抗干扰能力。
本发明的技术方案是:
一种基于4-苯乙烯吡啶盐长波发射识别H2S荧光探针,该探针L结构式如下:
Figure BDA0001806530790000021
一种基于4-苯乙烯吡啶盐长波发射识别H2S荧光探针的合成方法,其具体步骤如下:
(1)以乙醇为溶剂,将4-(二乙氨基)水杨醛、4-甲基吡啶盐
Figure BDA0001806530790000022
哌啶按照摩尔比1:(1~5):(0.1~2)进行投料,加热回流反应8h~16h,旋出溶剂,粗产物用硅胶柱色谱法进行纯化,用甲醇和二氯甲烷作为洗脱剂进行分离,得到化合物1
Figure BDA0001806530790000023
(2)以DMF为溶剂,将化合物1、2,4-二硝基氟苯、碳酸钾按照摩尔比1:(1.2~2):(1.5~ 3)进行投料,室温下搅拌4h~10h,反应结束后过滤得到粗产物,用硅胶柱色谱法进行纯化,用甲醇和二氯甲烷作为洗脱剂进行分离,得到荧光探针L
Figure BDA0001806530790000024
进一步的,步骤(1)和步骤(2)中所述洗脱剂甲醇和二氯甲烷的体积比为1:50~1:100。
一种基于4-苯乙烯吡啶盐长波发射识别H2S荧光探针的应用,在pH=5~10、体积比为6:4的HEPES与DMF缓冲溶液中对H2S进行检测,根据在607nm处的发射峰荧光增强,检测HS-
一种基于4-苯乙烯吡啶盐长波发射识别H2S荧光探针的应用,在体积比为6:4的实际水样与DMF混合溶液中对H2S进行检测,根据在607nm处的发射峰荧光增强,检测HS-
本发明所提供的基于4-苯乙烯吡啶盐类衍生物的合成路线如下:
Figure BDA0001806530790000031
本发明的有益效果:
合成荧光探针步骤简单,分离提纯容易;该荧光探针具有较长的发射波长,响应时间较短,可以在水介质中长波长(607nm)荧光增强识别H2S,具有特异选择性、较高的灵敏度和较好的抗干扰能力。荧光探针使用方法没有特殊限制,通常可以将探针分子溶解含40%DMF的水中,室温下进行测试,实现了实际水样中检测H2S的应用。
附图说明
图1是本发明荧光探针L的1H NMR谱图;
图2是本发明荧光探针L的13C NMR谱图;
图3是本发明荧光探针L与Br-,I-,NO2 -,CO3 2-,HCO3 -,CH3COO-,HPO4 2-,H2PO4 -, PO4 3-,CN-,SCN-,HS-,SO4 2-,SO3 2-,HSO3 -,HSO4 -,N3 -,S2O3 2-作用前后的荧光发
射光谱图;
图4是本发明荧光探针L对H2S识别时抗其它金属离子干扰的荧光检测图;
图5是本发明荧光探针L与不同倍数H2S作用前后的荧光发射光谱变化图;
图6是本发明荧光探针L的检测限图;
图7是本发明荧光探针L识别H2S时间响应图;
图8是本发明荧光探针L在水样中检测HS-的荧光变化图;
具体实施方式
下面结合具体实施例对本发明的技术方案作进一步详细地说明。
实施例1
(1)化合物1的具体合成步骤如下:
Figure BDA0001806530790000041
4-二乙氨基水杨醛(1.54g,8.0mmol),4-甲基吡啶盐(1.88g,8.0mmol)和哌啶(0.8mmol) 溶于乙醇,加热回流12h,旋出溶剂。粗产物经薄层柱色谱纯化,利用CH3OH:CH2Cl2=1:50 (v/v)做洗脱剂,分离得到2.05g化合物1,产率为62.5%;
1H NMR(400MHz,DMSO-d6)δ10.13(s,1H),8.59(d,J=6.5Hz,2H),8.03-7.93(m,3H), 7.49(d,J=9.0Hz,1H),7.15(d,J=16.0Hz,1H),6.33(dd,J=9.0,2.4Hz,1H),6.21(d,J=2.4 Hz,1H),4.15(s,3H),3.39(q,J=7.0Hz,4H),1.15(t,J=7.0Hz,6H).
(2)荧光探针L的具体合成步骤如下:
Figure BDA0001806530790000042
化合物1(410mg,1mmol),2,4-二硝基氟苯(223mg,1.2mmol),碳酸钾(207mg,1.5mmol),溶解在10mL DMF中,在室温条件下反应6h。反应结束后加水洗涤,用乙酸乙酯萃取,无水硫酸钠干燥,旋出溶剂,粗产物经薄层柱色谱纯化,利用CH3OH:CH2Cl2=1: 100(v/v)做洗脱剂,得到316.8mg探针L,产率55.0%。荧光探针L的1H NMR谱图如图 1所示,13C NMR谱图如图2所示。
1H NMR(400MHz,DMSO-d6)δ8.93(d,J=2.8Hz,1H),8.66(d,J=6.4Hz,2H),8.45(dd, J=9.3,2.8Hz,1H),7.95(d,J=6.4Hz,2H),7.85(d,J=9.0Hz,1H),7.76(d,J=16.2Hz,1H), 7.24(d,J=16.2Hz,1H),7.12(d,J=9.3Hz,1H),6.81(dd,J=9.0,2.5Hz,1H),6.55(d,J=2.5 Hz,1H),4.16(s,3H),3.41(q,J=7.1Hz,4H),1.09(t,J=7.1Hz,6H).
13C NMR(101MHz,DMSO-d6)δ155.86,154.22,153.22,151.36,144.96,141.52,139.20, 134.24,130.89,130.29,122.84,122.43,119.65,118.89,113.74,110.81,109.98,103.49,46.94, 44.47,40.33,12.86.
实施例2
(1)化合物1合成
4-二乙氨基水杨醛(1.54g,8.0mmol),4-甲基吡啶盐(3.76g,16.0mmol)和哌啶16mmol 溶于乙醇,加热回流8h,旋出溶剂。粗产物经薄层柱色谱纯化,利用CH3OH:CH2Cl2=1: 100(v/v)做洗脱剂,分离得到化合物1;
(2)荧光探针L的合成
化合物1(410mg,1.0mmol),2,4-二硝基氟苯(278.5mg,1.5mmol),碳酸钾(276mg,2.0mmol),用15mL DMF溶解,在室温条件下反应8h。反应结束后加水洗涤,用乙酸乙酯萃取,无水硫酸钠干燥,旋出溶剂,粗产物经薄层柱色谱纯化,利用CH3OH:CH2Cl2=1: 80(v/v)做洗脱剂,得到420mg探针L,产率72.9%。荧光探针L的1H NMR谱图如图1 所示,13C NMR谱图如图2所示。
实施例3
(1)化合物1合成
4-二乙氨基水杨醛(1.54g,8.0mmol),4-甲基吡啶盐(9.4g,40.0mmol)和哌啶8mmol 溶于乙醇,加热回流16h,旋出溶剂。粗产物经薄层柱色谱纯化,利用CH3OH:CH2Cl2=1: 100(v/v)做洗脱剂,分离得到化合物1;
(2)荧光探针L的合成
化合物1(410mg,1.0mmol),2,4-二硝基氟苯(371mg,2mmol),碳酸钾(414mg,3.0mmol),用15mL DMF溶解,在室温条件下反应10h。反应结束后加水洗涤,用乙酸乙酯萃取,无水硫酸钠干燥,旋出溶剂,粗产物经薄层柱色谱纯化,利用CH3OH:CH2Cl2=1:100 (v/v)做洗脱剂,得到荧光探针L。荧光探针L的1H NMR谱图如图1所示,13C NMR谱图如图2所示。
荧光探针L对H2S选择性的检测:
10μmol/L荧光探针L的HEPES:DMF=6:4(v/v,pH=7.4)缓冲溶液,向其中分别加入20 μL(50mmol/L)阴离子(Br-,I-,NO2 -,CO3 2-,HCO3 -,CH3COO-,HPO4 2-,H2PO4 -,PO4 3-, CN-,SCN-,HS-,SO4 2-,SO3 2-,HSO3 -,HSO4 -,N3 -,S2O3 2-),检测溶液的荧光发射光谱变化。如图3所示,当加入阴离子时,只有HS-可以引起607nm处的荧光强度原位增强,而其他阴离子对探针L荧光强度影响不大,由此可知,荧光探针L对H2S识别有高度的选择性。
荧光探针L识别H2S的抗干扰检测:
10μmol/L荧光探针L的HEPES:DMF=6:4(v/v,pH=7.4)溶液,向其中分别加入20μL(50mmol/L)阴离子(Br-,I-,NO2 -,CO3 2-,HCO3 -,CH3COO-,HPO4 2-,H2PO4 -,PO4 3-, CN-,SCN-,HS-,SO4 2-,SO3 2-,HSO3 -,HSO4 -,N3 -,S2O3 2-,),检测溶液的荧光发射光谱, 然后向以上含有阴离子的溶液中再分别加入20μL(50mmol/L)的HS-,检测溶液的荧光发射光谱,取最大发射波长所对应的强度值作图,如图4所示。即使有其它阴离子存在时,HS-也能使探针L荧光增强,说明荧光探针L只对H2S有识别,不受其它阴离子的干扰。
荧光探针L对H2S的滴定测试:
10μmol/L的荧光探针L的HEPES:DMF=6:4(v/v,pH=7.4)缓冲溶液,分别加入0~50 倍(50mmol/L)的HS-,检测溶液的荧光发射光谱变化,如图5所示。从图5中可以看出,随着HS-不断加入,在607nm处的发射峰逐渐升高,当加入50倍的HS-时,在607nm处的发射峰不再升高,说明此时达到了饱和。
荧光探针L对H2S的检测限测试:
在探针L的HEPES:DMF=6:4(v/v,pH=7.4)缓冲溶液中,测试了不少于11个平行样的荧光强度,根据公式∑(Xi-X)2=(X1-X)2+(X2-X)2+……+(Xn-X)2求出平方差的总和(Xi为每次测量受体本身荧光强度值,X为荧光强度平均值,n为测试次数,n大于等于11),然后根据公式S=[∑(Xi-X)2/(n-1)]0.5求出S,再根据检测限公式3S/K,K为所选直线部分的斜率(注:直线是根据滴定做点图,横坐标为离子浓度,纵坐标为荧光强度),求出检测线为3.39×10-6 mol/L(见图6),达到了微摩尔级,这说明该探针有较低的检测限,可检测较低浓度的H2S,具有较高的灵敏度,有一定的实际应用价值。
荧光探针L对H2S的响应时间测试:
在探针L的HEPES:DMF=6:4(v/v,pH=7.4)缓冲溶液中,加入50倍HS-后测试不同时间的荧光强度变化,从图7中可以看出,随着时间延长探针荧光强度逐渐增强,在20分钟左右达到最高并呈稳定趋势,说明探针L对H2S的识别在20分钟内即可完成,具有快速响应的能力。
荧光探针L在实际水样中检测H2S:
为了检验探针L识别H2S的实际应用性,我们探讨了实际水样中探针L的应用。取湖水、河水水样,先过滤除去其中的不溶性杂质,然后再用有机溶剂萃取除去其中的有机物,萃取后的水样及自来水都加热煮沸15分钟,冷却,过滤杂质,清液用作后续水样测试。
用处理后的实际水样与DMF按体积比6:4制备成10μmol/L的荧光探针L水溶液,分别加入0~500μmol/L的HS-,3小时后检测溶液的荧光发射光谱变化(见图8),由图8可以看出在加入50~500μmol/L的HS-,荧光强度与加入HS-的浓度呈线性关系,说明当实际水样中的HS-浓度在50~500μmol/L的范围内,可实现对HS-的定量检测。因此,探针L具有在环境系统中定量检测H2S的潜在应用。
以上仅为本发明的具体实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (1)

1.一种用于水体中检测H2S的荧光探针,其特征是:在体积比为6: 4的实际水样与DMF混合溶液中对H2S进行检测,根据在607 nm处的发射峰荧光增强,检测HS-
该探针L结构式如下:
Figure DEST_PATH_IMAGE001
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