CN111349069A - 一种检测巯基的近红外有机小分子探针、其制备方法及应用 - Google Patents
一种检测巯基的近红外有机小分子探针、其制备方法及应用 Download PDFInfo
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Abstract
Description
技术领域
本发明属于化学分析技术领域,具体涉及一种检测巯基的近红外有机小分子荧光探针及其制备方法和应用。
背景技术
巯基是生物体中化学活性最高的基团之一,在生物氧化还原体系、蛋白质翻译后修饰过程中起着关键作用,对生命体的新陈代谢具有重要的调节作用。生命体的巯基化合物包括半胱氨酸(Cys)、同型半胱氨酸(Hcy)和谷胱甘肽(GSH),具有广泛的细胞生物学功能,在人体的生化防御系统中起着重要作用。例如,Cys的浓度异常与白化病、水肿和肝脏损伤等疾病有关。Hcy的浓度异常与心血管疾病和老年痴呆等疾病相关。GSH是体内重要的抗氧化剂和解毒剂,其浓度异常变化会影响细胞内氧化还原动态平衡,与多种疾病的发生发展有密切关系。由此可见,过高或过低的巯基化合物水平都会影响正常的生理功能和病理功能,因此维持体内巯基化合物的平衡性非常重要。正是由于巯基化合物的重要性,检测生物体系的巯基化合物,尤其是跟踪其在生命活动中的过程具有重要意义。
传统检测生物巯基的方法大多需要昂贵的仪器,或专业的技术人员,无法在不损伤活细胞或组织的前提下进行检测,更无法实时检测生物体系中巯基浓度的变化。与这些传统方法相比,荧光探针技术可用于生物巯基的实时原位检测,具有显著的优势。然而文献报道的探针大多处于短波区,激发时会对细胞产生损伤,并且生物体中的自发荧光对检测也产生了严重的干扰,使其在应用中受到了限制。因此,开发一种用于活体检测生物巯基的近红外荧光探针在化学、环境、生物及医药等领域具有非常重要的意义。
发明内容
本发明的目的在于提供一种具有高灵敏度、高选择性、响应速度快的检测巯基的近红外有机小分子探针。本发明的另一目的是提供一种上述近红外有机小分子探针的制备方法。本发明目的之三是提供一种上述近红外有机小分子探针在巯基检测中的应用。
本发明的目的通过以下技术方案实现:
一种检测巯基的近红外有机小分子探针,所述有机小分子探针的化学结构如(I)所示:
(I)
上述检测巯基的近红外有机小分子探针的制备方法,合成路线如下:
具体制备步骤如下:
(1)将化合物1、化合物2和有机溶剂混合,然后滴氢氧化钠溶液,室温反应后,浓缩有机相,用酸中和,得到中间体3;
(2)中间体3、化合物4在和有机溶剂混合,加入碱,室温搅拌反应,反应结束后,浓缩有机相,分离提纯即可得所述检测巯基的近红外有机小分子探针(I)。
所述步骤(1)和步骤(2)中有机溶剂为乙腈、甲醇、乙醇、二氯甲烷、三氯甲烷,四氢呋喃或N,N-二甲基甲酰胺。
所述的化合物1、化合物2及氢氧化钠摩尔比为1:(1~2):(1~5)。
所述的酸为无机酸盐酸,硫酸,硝酸,磷酸,或有机酸柠檬酸,苹果酸,抗坏血酸。
所述步骤(2)中化合物3、化合物4和碱的摩尔比为1:1:1;碱为碳酸钠、碳酸钾、三乙胺或DIPEA。
所述的分离提纯包括色谱柱层析和/或重结晶分离,所用溶剂选自乙醇、甲醇、乙酸乙酯、乙醚、氯仿、二氯甲烷、石油醚和正己烷中的任一单组份溶剂或两种以上的混合溶剂。
所述的近红外有机小分子探针作为比色探针和/或荧光探针用于巯基含量检测。
所述的近红外有机小分子探针的应用,用于荧光检测、目视定性检测和细胞成像检测含巯基氨基酸。
本发明的制备方法及产物具有如下优点:
1. 本发明的近红外有机小分子探针反应步骤短,后处理简单,产率高。
2. 本发明的近红外有机小分子探针用于生物巯基检测可快速识别且裸眼可见其颜色变化,可以实现可视化检测。
3. 本发明的近红外有机小分子探针用于生物巯基的双响应,灵敏度高、响应快速。在365 nm便携紫外灯下直接观察其荧光变化。
4. 本发明的近红外有机小分子探针可用于活细胞或者组织中检测巯基。
附图说明
图1是本发明有机小分子探针(I)的合成路线;
图2是本发明所述的探针(I)的1H NMR图;
图3是实施例1所得探针(I)的溶液加入Cys前后的溶液颜色对比图;
图4是实施例1所得探针(I)的溶液加入Cys前后的溶液在365 nm紫外照射下的荧光对比图;
图5是实施例1所得探针(I)的荧光发射强度随Cys的浓度的变化曲线图;
图6示Cys浓度和荧光强度的线性关系;
图7是实施例1所得探针(I)在加入不同氨基酸后635 nm处的荧光强度图;
图8是实施例1所得探针(I)的溶液加入生物巯基前后的细胞成像图。
具体实施方式
下面结合实例及附图对本发明作进一步的描述,但本发明的实施方式不限于此。
核磁谱图采用美国BrukerAV-300型核磁共振仪测定,氘代DMSO作溶剂,荧光光谱采用美国Agilent公司荧光分光光度计,紫外光谱采用北京莱伯泰科仪器有限公司UV9100A紫外分光光度计。其他参数参照常规仪器即可。
实施例1
本实施例的有机小分子探针(I),合成路线如图1所示,其合成步骤如下:
将373 mg的2-氯-1-(2,4-二羟基苯基)乙酮(2 mmol)加入到40 mL含有398 mg 6-(二甲基氨基)-2-萘醛(2 mmol)的乙醇溶液中,边搅拌边缓慢滴加含有2 mmoL氢氧化钠的水溶液5 mL,滴加完毕,室温搅拌12小时。反应结束后,用体积分数为10%稀盐酸溶液调至中性。过滤,滤饼用乙醇重结晶,得到中间体(化合物3)。将该中间体和533 mg的2,4-二硝基苯磺酰氯(2 mmol)溶于40 mL二氯甲烷中,搅拌下缓慢滴加202 mg三乙胺(2 mmol),室温搅拌12反应小时。反应完毕,浓缩,剩余物用无水乙醇重结晶得有机小分子探针(I)842 mg,产率75%。所得产物核磁氢谱图见图2所示。产物鉴定数据如下:
1H NMR (300 MHz, DMSO-d 6) δ 9.15 (d, J = 2.4 Hz, 1H), 8.63 (d, J = 8.7Hz, 1H), 8.36 (d, J = 8.7 Hz, 1H), 8.32 (s, 1H), 7.99 (d, J = 8.7 Hz, 1H),7.88 (d, J = 8.4 Hz, 1H), 7.81 (d, J = 9.3 Hz, 1H), 7.72 (d, J = 8.7 Hz, 1H),7.66 (s, 1H), 7.27 (d, J = 9.0 Hz, 1H), 7.12 (s, 1H), 7.09 (s, 1H), 6.96 (s,1H), 3.08 (s, 6H). ESI-MS m/z: 562.1 [M+H]+. Elemental Anal. Calcd forC27H19N3O9S: C, 57.75; H, 3.41; N, 7.48. Found: C, 57.55; H, 3.35; N, 4.81.
实施例2
本实施例的有机小分子探针(I),其合成步骤如下:
将上述实施例1所得到的中间体和533 mg的2,4-二硝基苯磺酰氯(2 mmol)溶于40 mL二氯甲烷中,搅拌下加入276 mg的K2CO3(2 mmol),室温搅拌24小时。反应完毕,水洗有机层,取有机层,干燥浓缩后,剩余物用无水乙醇重结晶,得有机小分子探针(I)786 mg,产率70%。产物鉴定数据同实施例1。
实施例3
本实施例的有机小分子探针(I),其合成步骤如下:
将上述实施例1所得到的中间体和533 mg的2,4-二硝基苯磺酰氯(2 mmol)溶于40 mL二氯甲烷中,搅拌下加入258 mg的DIPEA(2 mmol),室温搅拌12小时。反应完毕,水洗有机层,取有机层,干燥浓缩后,剩余物用柱层析分离,V(二氯甲烷):V(甲醇)=100 :1,得有机小分子探针(I)820 mg,产率73%。产物鉴定数据同实施例1。
性能测试:
(1)探针(I)的可视化检测
取实施例1制备的有机小分子探针(I)1.0 mmol溶于DMSO中,取Cys(1.0 mmol)溶于纯净水中,配制成浓度为10 mmol/L的储备液,使用时用THF和PBS缓冲溶液的混合液(体积比为3:7)稀释Cys储备液。取2只EP管,其中一支为浓度20 μM的探针(I),另一支为20 μM的探针(I)和40 μM的Cys,静置5~10分钟后肉眼观察,如图3所示。探针(I)为粉红色(图3左),加入2当量的Cys后溶液颜色为淡黄色(图3右)。将此两个待测液放置在365 nm手提紫外灯下,探针(I)为淡紫色(图4左),加入2当量的Cys,溶液发出亮红色荧光(图4右)。以上实验结果证实有机小分子探针(I)具有紫外和荧光双响应,并且能够裸眼检测Cys。将Cys替换为Hcy或GSH后,观察结果与图3和图4一致。
(2)探针(I)的荧光发射强度随Cys的浓度的变化
使用(1)中的储备液和混合液稀释,将探针(I)浓度稀释为10 μM,Cys浓度范围为0~20μM。用荧光分光光度计测其加入不同浓度的Cys时荧光发射光谱。其光谱图如图5所示。由图5可知,探针(I)在452 nm激发下荧光强度很弱,加入Cys后在635 nm处出现新的发射峰。在离子浓度为0~20 μM范围内,随着离子浓度的增加,荧光强度逐渐升高。将Cys替换为Hcy或GSH后,图谱与图5基本相同。
(3)探针(I)对Cys的检测限
采用荧光滴定实验对探针的检测限进行测定,激发波长为452 nm。在探针(I) (10 μmol/L)的缓冲体系中加入不同浓度的Cys (0~20 μmol/L)。10 min后测其荧光数据。以Cys浓度为横坐标,荧光强度为纵坐标作图,得到工作曲线,Cys浓度和荧光强度呈现良好的线性关系,具体详见图6。根据检测限(LOD)计算公式:LOD=3×SD/K(3为设定的置信参数,SD为未加Cys时荧光变化的标准偏差,K为线性关系斜率),利用Origin软件拟合实验数据,计算得到检测限为2.1×10-8 mol/L,远低于人体血浆中Cys的浓度(μmol/L级)。采用同样方法,可测得Hcy或GSH的检测限为1.6×10-8 mol/L和3.1×10-8 mol/L。
(4)探针(I)对不同氨基酸的选择性
使用(1)中的储备液和混合液稀释,将探针(I)浓度稀释为10 μM,氨基酸浓度为20 μM,激发波长为452 nm。用荧光光度计测其加入不同种氨基酸的荧光发射光谱,具体结果见图7,由图7可知,探针(I)与Cys、Hcy和GSH孵育后,635 nm处荧光发射强度明显增加。而与其他氨基酸(天冬氨酸Asp,丙氨酸Ala,缬氨酸Val,苯丙氨酸Phe,组氨酸His,异亮氨酸Ile,赖氨酸Lys,精氨酸Arg,脯氨酸Pro,甘氨酸Gly,甲硫氨酸Met,天冬氨酸Asn,谷氨酸Glu,苏氨酸Thr等不含巯基的氨基酸)孵育后,635 nm处荧光强度并没有明显变化,说明探针(I)对生物巯基具有很好的选择性响应。
(5)探针的细胞成像
取繁殖期人宫颈癌(Hela)细胞,在加入100 U/mL青霉素,100 mg/mL链霉素和10%胎牛血清的DMEM培养液,于5% CO2环境中37 ℃培养。将细胞以1×105个/mL的密度接种在φ30mm玻璃底培养皿中,采用激光共聚焦扫描显微镜(CLSM)进行成像。首先将Hela细胞用10 μM的探针(I)在37 ℃下孵育30分钟,并用PBS洗涤3次,然后通过CLSM成像并拍照。然后将细胞与Cys(20 μM)在37 ℃下孵育30分钟,并用PBS洗涤3次,然后通过CLSM成像并拍照。激发波长为577 nm,具体见图8。
如图8左所示,正常培养条件下的HeLa细胞与10 μM探针(I)孵育后没有红色信号。在加了20 μM的Cys孵育后,可以清楚地观察到强的红色荧光(图8,右)。将Cys替换为Hcy或GSH后,图片与图8右图相似,有明显红色荧光;将Cys替换为其他氨基酸后,图片与图8左图相似,无红色荧光。表明该探针可以进入细胞并在活细胞中检测Cys、Hcy或GSH,对不含巯基的氨基酸没有荧光响应。因此,探针(I)可以作为活细胞中快速灵敏地检测生物巯基的工具。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所做的改变、修饰、替换、组合、简化均为等效的置换方式,都包含在本发明保护范围之内。
Claims (9)
3.根据权利要求2所述的检测巯基的近红外有机小分子探针的制备方法,其特征在于:所述步骤(1)和步骤(2)中有机溶剂为乙腈、甲醇、乙醇、二氯甲烷、三氯甲烷,四氢呋喃或N,N-二甲基甲酰胺。
4.根据权利要求2所述的检测巯基的近红外有机小分子探针的制备方法,其特征在于:所述的化合物1、化合物2及氢氧化钠摩尔比为1:(1~2):(1~5)。
5.根据权利要求2所述的检测巯基的近红外有机小分子探针的制备方法,其特征在于:所述的酸为无机酸盐酸,硫酸,硝酸,磷酸,或有机酸柠檬酸,苹果酸,抗坏血酸。
6.根据权利要求2所述的检测巯基的近红外有机小分子探针的制备方法,其特征在于:所述步骤(2)中化合物3、化合物4和碱的摩尔比为1:1:1;碱为碳酸钠、碳酸钾、三乙胺或DIPEA。
7.根据权利要求2所述的检测巯基的近红外有机小分子探针的制备方法,其特征在于:所述的分离提纯包括色谱柱层析和/或重结晶分离,所用溶剂选自乙醇、甲醇、乙酸乙酯、乙醚、氯仿、二氯甲烷、石油醚和正己烷中的任一单组份溶剂或两种以上的混合溶剂。
8.根据权利要求1所述的近红外有机小分子探针作为比色探针和/或荧光探针用于巯基含量检测。
9.根据权利要求1所述的近红外有机小分子探针的应用,其特征在于,用于荧光检测、目视定性检测和细胞成像检测含巯基氨基酸。
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