CN114163422B - 一种用于检测酸性pH值的比率型荧光探针及其制备方法和应用 - Google Patents

一种用于检测酸性pH值的比率型荧光探针及其制备方法和应用 Download PDF

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CN114163422B
CN114163422B CN202210058144.7A CN202210058144A CN114163422B CN 114163422 B CN114163422 B CN 114163422B CN 202210058144 A CN202210058144 A CN 202210058144A CN 114163422 B CN114163422 B CN 114163422B
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王石发
张燕
王忠龙
杨益琴
沈哲宇
巩帅
秦阿慧
李明新
梁越寅
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Abstract

本发明公开了一种用于检测酸性pH值的比率型荧光探针及其制备方法和应用。该荧光探针为3‑(吡啶‑4‑基)‑6‑((4,7,7‑三甲基‑3‑羰基双环[2.2.1]庚‑2‑亚基)甲基)‑2H‑苯并吡喃‑2‑酮。以2‑羟基‑5‑((4,7,7‑三甲基‑3‑羰基双环[2.2.1]庚‑2‑亚基)甲基)苯甲醛为原料,与4‑吡啶甲酸乙酯进行缩合环化反应得到3‑(吡啶‑4‑基)‑6‑((4,7,7‑三甲基‑3‑羰基双环[2.2.1]庚‑2‑亚基)甲基)‑2H‑苯并吡喃‑2‑酮。该探针能准确、灵敏监测酸性溶液的pH值,检测范围为pH 3.19‑7.54,随着溶液酸度的增加,探针溶液的荧光颜色从亮蓝色逐渐变成亮黄色,可作为检测酸性pH值的荧光探针,具有良好的应用前景。

Description

一种用于检测酸性pH值的比率型荧光探针及其制备方法和 应用
技术领域
本发明属精细有机合成技术领域,涉及一种用于检测酸性pH值的樟脑基比率型荧光探针及其制备方法和应用。
背景技术
pH值是生物体内微环境的主要参数之一,与细胞内许多重要的生理代谢活动密切相关,对维持细胞的正常功能至关重要。而pH值失衡会引起细胞功能紊乱,从而可能导致多种疾病,如囊性纤维化、阿尔茨海默病,癌症等。因此,开发能够准确、实时监测pH值变化的检测方法具有十分重要的意义。
与传统的检测方法相比,荧光探针用于pH值检测具有响应迅速、操作简单、专一性好、灵敏度高等优势,具有良好的应用价值和市场前景。利用2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛为原料,合成用于检测酸性pH值的新型荧光探针,暂无相关报道。
发明内容
针对现有技术中存在的不足,本发明所要解决的技术问题是提供一种用于检测酸性pH值的比率型荧光探针,能满足使用需求。本发明所要解决的另一技术问题是提供3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮的制备方法。本发明还要解决一技术问题是提供3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮在检测酸性pH中的应用。
为实现解决上述技术问题,本发明采用的技术方案为:
检测酸性pH值的比率型荧光探针,为3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮,其结构式为:
所述的用于检测酸性pH值的比率型荧光探针的制备方法,2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛与4-吡啶甲酸乙酯发生缩合环化反应,得到3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮。
具体的制备步骤为:
(1)将1mmol 2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛、1~1.5mmol 4-吡啶甲酸乙酯、30~50mL无水乙醇和20~30μL哌啶依次加入干燥的三口烧瓶中,搅拌回流3~6h;
(2)将反应液冷却至室温,抽滤、洗涤、干燥得到淡黄色晶体3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮。
3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮溶液在pH 3.19-7.54范围内,随着溶液酸度的升高,溶液的荧光颜色从亮蓝色逐渐变成亮黄色,可作为检测酸性溶液pH值的荧光探针,而且在检测pH时,不受阳离子、阴离子以及氨基酸等的影响。
有益效果:与现有技术相比,本发明利用2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛为原料,与4-吡啶甲酸乙酯进行缩合环化反应得到3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮,能准确、灵敏检测酸性溶液的pH值,具有信噪比高、选择性好、灵敏度高、操作简单,响应迅速等诸多优点,具有良好的应用价值。
附图说明
图1是3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮在不同pH值下的荧光光谱图;
图2是3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮的荧光强度比(F516nm/F455nm)与pH进行非线性拟合的曲线图;
图3是3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮在pH值为7.0和4.0溶液中加入不同金属离子、阴离子以及氨基酸后的荧光强度比(F516nm/F455nm)图。
具体实施方式
下面结合具体实施例对本发明做进一步的说明。
实施例1
3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮的制备,反应式如下:
具体步骤如下:
3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮的制备:
将1mmol2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛、1mmol4-吡啶甲酸乙酯、30mL无水乙醇和20μL哌啶依次加入干燥的三口烧瓶中,搅拌回流4h。反应液冷却至室温,经抽滤、洗涤、干燥得到淡黄色晶体3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮,得率为78%,纯度为99.8%。1H NMR(600MHz,DMSO-d6)δ:8.68-8.69(m,2H),8.57(s,1H),8.02(d,J=2.1Hz,1H),7.82(dd,J=8.6,2.1Hz,1H),7.77-7.78(m,2H),7.51(d,J=8.6Hz,1H),7.16(s,1H),3.24(d,J=4.2Hz,1H),2.17-2.23(m,1H),1.79-1.84(m,1H),1.48-1.52(m,1H),1.37-1.41(m,1H),1.00(s,3H),0.94(s,3H),0.74(s,3H);13C NMR(150MHz,DMSO-d6)δ:207.13,159.34,153.71,150.21,143.01,142.92,142.33,134.64,132.07,129.99,125.42,125.10,123.24,119.90,117.11,56.96,48.88,46.69,30.51,26.15,20.71,18.39,9.72;HRMS(m/z):[M+H]+calculated for C25H24NO3,386.1756;found 386.1754。
实施例2
将盐酸溶解于乙腈/水(v/v=1/9)的体系中,稀释成具有不同pH值(3.98,3.42,3.65,3.86,4.10,4.34,4.69,4.99,5.19,5.45,5.72,5.92,6.15,6.44,6.83,7.22,7.64)的溶液,加入3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮,使探针终浓度为1×10-5M。采用荧光光谱滴定法在荧光分光光度计上测得在不同pH值下3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮的荧光发射光谱,如图1所示。结果表明,随着溶液中pH值的不断降低,该探针在455nm处的荧光发射强度逐渐下降,而在516nm处的荧光发射强度却逐渐升高。对荧光强度比(F516nm/F455nm)与pH进行非线性拟合,得到如图2所示的曲线,并进一步计算得到pKa值为5.14。在溶液pH为4.34到5.92的范围内,荧光强度比(F516nm/F455nm)与pH呈线性相关,线性方程为F516nm/F455nm=-2.594pH+16.730(R2=0.9945)。因此,该化合物可作为灵敏检测酸性溶液pH值的荧光探针。
实施例3
将3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮溶于乙腈/水(v/v=1/9)中配制成浓度为1×10-5M的探针溶液,同时加入不同金属离子、阴离子以及氨基酸溶解于乙腈/水(v/v=1/9)中配制成1.0×10-4M浓度的溶液。采用荧光光谱滴定法在荧光分光光度计上测得不同金属离子、阴离子以及氨基酸存在下3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮的荧光强度,并作出516nm与455nm的荧光强度比(F516nm/F455nm),得到如图3所示的柱状图。结果表明,在中性(pH 7.0)和酸性(pH 4.0)探针溶液中加入金属离子(Al3+,Zn2+,Ca2+,Cu2+,Fe2+,Fe3+,Mg2+,Ni2+,Cd2+,Pb2+,Co2+,Cr3+,Mn2+,Na+,Hg2+,La3+,Cs2+,Ag+,K+)、阴离子(F-,Cl-,Br-,I-,SO4 2-,ClO-,HS-,PO4 3-,NO3 -,CO3 2-,SO3 2-,SCN-)以及氨基酸(Cys,Hcy,Arg,Asp,Gly,Glu,Tyr)等,该探针的荧光强度比(F516nm/F455nm)没有发生明显的变化。由此说明,该化合物可以作为特异性检测酸性pH值的荧光探针。

Claims (6)

1.一种用于检测酸性pH值的比率型荧光探针,其特征在于,其结构式为:
2.权利要求1所述的用于检测酸性pH值的比率型荧光探针的制备方法,其特征在于,在哌啶催化下,2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛与4-吡啶甲酸乙酯进行缩合环化反应,得到3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮。
3.根据权利要求2所述的用于检测酸性pH值的比率型荧光探针的制备方法,其特征在于,具体的制备方法包括:
(1)将1mmol 2-羟基-5-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)苯甲醛、1~1.5mmol 4-吡啶甲酸乙酯、30~50mL无水乙醇和20~30μL哌啶依次加入干燥的三口烧瓶中,搅拌回流3~6h;
(2)将反应液冷却至室温,抽滤、洗涤、干燥得到淡黄色晶体3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮。
4.权利要求1所述的3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮在检测酸性pH值的应用。
5.权利要求4所述的应用,其特征在于,3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮在pH 3.19-6.83范围内,随着溶液酸度的升高,探针溶液的荧光颜色从亮蓝色逐渐变成亮黄色。
6.权利要求4所述的应用,其特征在于,3-(吡啶-4-基)-6-((4,7,7-三甲基-3-羰基双环[2.2.1]庚-2-亚基)甲基)-2H-苯并吡喃-2-酮在制备用于检测酸性溶液pH值的荧光探针中的应用。
CN202210058144.7A 2022-01-18 2022-01-18 一种用于检测酸性pH值的比率型荧光探针及其制备方法和应用 Active CN114163422B (zh)

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