CN110243794B - 一种基于石墨烯量子点的检测二氧化硫的荧光探针及其应用 - Google Patents
一种基于石墨烯量子点的检测二氧化硫的荧光探针及其应用 Download PDFInfo
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Abstract
一种基于石墨烯量子点的检测二氧化硫的荧光探针及其应用。本发明提供了一种羟基化石墨烯量子点负载2‑(N,N‑二乙胺基)‑7‑(N,N‑二乙胺基)香豆素并[4,3‑b]色烯的复合物。可用于检测溶液、细胞或生物体中二氧化硫、亚硫酸盐或亚硫酸氢盐。本发明制备的一种石墨烯量子点与小分子荧光探针的复合材料,具有多个线性荧光强度比值的变化。此外,该探针成功应用于细胞成像,以及斑马鱼成像,在生物体分析检测中显示出很大的优越性。
Description
技术领域
本发明属于分析化学技术领域,具体涉及一种检测二氧化硫的荧光探针及其应用。
背景技术
二氧化硫(SO2)长期被视为一种环境污染物,其产生途径大部分是由化石燃料(如煤炭、石油)的燃烧、含硫矿物(如黄铁矿)的冶炼等生成。二氧化硫作为雾霾的主要成分之一,在环境中被进一步氧化转变为硫酸,造成酸雨。其衍生物(亚硫酸盐和亚硫酸氢盐)应用广泛。作为还原剂,常应用于医药和有机合成中;作为稳定剂和抗氧化剂,应用于葡萄酒的发酵;作为防腐剂,应用于食品添加剂中。然而,流行病学研究发现长期接触二氧化硫不仅会引起呼吸道疾病,同时也可引发心血管疾病,肺癌及神经系统失调。二氧化硫与空气中的其他气体或颗粒发生反应产生硫酸盐气溶胶,被人体吸入,导致一系列呼吸系统疾病和心血管疾病等,传统中药硫磺蒸熏后残留的二氧化硫及硫酸盐对呼吸道、胃肠道、神经系统等均有不同程度的危害,过量摄入二氧化硫易导致不良反应和急性症状,如潮红,低血压,腹泻,荨麻疹和腹痛。由于环境及药物的成分复杂,且其中SO2及其衍生物的含量低,因而急需开发一种灵敏度高、选择性好且成本低的方法,用于快速测定SO2含量。
检测SO2及其衍生物方法主要有:比色法、化学发光法和色谱法等。其中比色法和化学发光法灵敏度低且选择性差,色谱等方法设备昂贵操作繁琐。与这些方法相比,荧光探针法操作简单、选择性好且灵敏度高,是检测复杂样品中SO2及其衍生物的备选技术,此外,结合共聚焦显微镜可实现细胞成像分析,用于生物分子可视化检测。
目前,针对检测二氧化硫的分子荧光探针已有文献报道,但这些常见的荧光探针多有背景干扰、响应时间较长、散射干扰等缺陷,这样有可能影响在复杂生理环境中对二氧化硫检测的应用。比率型荧光探针能够在一定程度上有效消除光漂白、荧光仪器光源强度变化、荧光光程长度变化、以及细胞实验时导入细胞内的探针浓度变化所导致的假阳性结果,因此相对于普通荧光探针,比率型荧光探针有着明显的优势,因而具有更为广泛的应用前景。对于比率型荧光探针,对于同一检测物,发射波长特征峰荧光强度比值越多,则探针越精确。然而,传统小分子探针由于其分子设计和合成的原因,仅能实现到单一比值,几乎无法实现多比值。石墨烯量子点具有独特的π电子结构,能够与同样具有π共轭体系的其他材料通过π-π堆积作用以非共价键方式结合,能够具有多个线性荧光强度比值的变化。
发明内容
针对现有技术中的问题,本发明提供一种检测二氧化硫的荧光探针,响应速度快、抗干扰能力强。
本发明的另一目的是提供一种上述荧光探针在检测溶液中或生物细胞内二氧化硫的应用。
为实现上述目的,本发明采用如下技术方案。
一种羟基化石墨烯量子点负载2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯的复合物,简称CP@GQDs-OH。
上述荧光探针的制备方法,包括以下步骤:
0-4℃下,将羟基化石墨烯量子点和2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯分散在溶液中,室温下搅拌反应获得荧光探针。
所述混合液中GQDs-OH与CP的质量比为1:1-4。
一种上述复合物在检测溶液、细胞或生物体中二氧化硫、亚硫酸盐或亚硫酸氢盐的应用。
本发明的机理如下:
2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯(简称CP)和羟基化石墨烯量子点(简称GQDs-OH)作为共同发光物质。其中,CP作为二氧化硫识别物质,GQDs-OH作为载体,两者之间存在有效的荧光能量共振转移过程,在检测二氧化硫前,发射绿色荧光GQDs-OH作为能量供体,发射红色荧光的CP作为能量受体;检测二氧化硫后,CP红色荧光被淬灭,发射蓝色荧光,由能量受体转变为能量供体。通过对不同波长荧光强度之间的比值变化,能够实现对二氧化硫的定量检测。
本发明具有以下优点:
本发明制备了一种石墨烯量子点与小分子荧光探针的复合材料,实现了对亚硫酸氢或亚硫酸盐的检测,并且具有多个线性荧光强度比值的变化。此外,该探针成功应用于细胞成像,以及斑马鱼成像,在生物体分析检测中显示出很大的优越性。
附图说明
图1是荧光探针的紫外-可见光谱吸收谱图;
图2是荧光探针在磷酸缓冲液中滴定不同浓度的亚硫酸氢钠的吸收光谱图,探针浓度为10 μg/mL;
图3是荧光探针所检测不同浓度的亚硫酸氢钠的滴定实验,其中激发波长:380nm,探针的浓度为10 μg/mL;
图4是荧光探针在磷酸缓冲液中的选择性,其中激发波长为380 nm;探针的浓度:10 μg/mL,选择性离子的浓度为1 mM;
图5是荧光探针的细胞成像应用,激发波长:405 nm,发射波段:425 -475 nm、500-550 nm和570-620 nm;
图6是荧光探针的斑马鱼成像应用,激发波长:405 nm,发射波段:425-475 nm、500-550 nm和570-620 nm。
具体实施方式
下面结合实施例和附图对本发明做进一步说明,但本发明不受下述实施例的限制。
实施例1 荧光探针CP@GQDs-OH的合成
(1)羟基化石墨烯量子点(GQDs-OH)的合成
根据Gram-scale synthesis of single-crystalline grapheme quantum dotswith superior optical properties(Nature communications, 2014, 5:5357)方法:将1,3,6-三硝基芘1.5 g超声分散于35 mL 0.2 M NaOH水溶液中,并转移至反应釜中180℃加热10h,过滤除去难溶物后,以透析提纯得到GQD-OH的水溶液,烘干后得到黑色GQD-OH粉末。
(2)2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯(CP)的合成
根据文献Two-Photon and Deep-Red Emission Ratiometric FluorescentProbe with a Large Emission Shift and Signal Ratios for Sulfur Dioxide:Ultrafast Response and Applications in Living Cells, Brain Tissues, andZebrafishes(Analytical chemistry, 2017, 89, 9388-9393)的方法:称量一定量的丙二酸(1)和苯酚(2)置于反应瓶中,0℃下缓慢滴加三氯氧磷(3),滴加完毕后,整个反应体系在115℃下加热搅拌,1.5小时,将反应体系倒入水中,用乙酸乙酯萃取,干燥乙酸乙酯萃取液后,减压蒸除乙酸乙酯,得到浅棕色的油状丙二酸二苯酯(4),该化合物不需要进一步纯化直接进行下一步;量取适量的丙二酸二苯酯(4)和间二乙氨基苯酚(5)于反应瓶,再加入适量甲苯后,整个反应体系加热回流7小时,静置降温,减压过滤,滤饼用少量正己烷洗涤,真空干燥的到浅黄色的固体4-羟基-7-二乙胺基香豆素(6);氮气氛围中,在15℃以下,将N,N-二甲氨基甲酰胺(DMF)缓慢滴加到适量的三氯氧磷(3)中,向上述溶液中缓慢滴4-羟基-7-二乙胺基香豆素(6)的DMF溶液,60℃下搅拌12小时后,将反应体系倒入冰水中,使用氢氧化钠水溶液调节pH直到有大量固体析出,减压过滤,水洗,干燥后得到4-氯-7-二乙胺基香豆素-3-甲醛(7);将适量的4-氯-7-二乙胺基香豆素-3-甲醛(7)和间二乙氨基苯酚(5)溶解在适量的乙酸中,整个反应体系在150℃下反应2h,而后加入适量的高氯酸,在慢慢向其中加入蒸馏水,有大量固体析出,减压过滤,水洗,真空干燥,得到12-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯(8):
(3)室温下将10 mg 2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯加入装有10 mL二甲基亚砜的离心管中,得到CP的DMSO溶液;
(4)10 mg羟基化石墨烯量子点(简称GQDs-OH)分散于装有10 mL磷酸缓冲溶液(pH=7.4)的烧瓶中,室温下超声分散30 min,得到GQDs-OH的PBS溶液;
(5)在0℃下,将CP的DMSO溶液和GQDs-OH的PBS溶液按照体积比4:1的比例混合,超声分散30 min后室温搅拌2 h,得到浓度为1 mg/mL CP@GQDs-OH的DMSO/水溶液。
荧光探针CP@GQDs-OH与CP的紫外吸收光谱比较(由于GQDs-OH的加入,相较于CP的紫外吸收光谱,在350nm-450nm范围内的吸光度增加,且在425nm处产生一个新的吸收峰)
实施例2 荧光探针CP@GQDs-OH对不同浓度的亚硫酸氢钠的吸收光谱
配制浓度为1mg/mL的实施例1所得荧光探针CP@GQDs-OH的磷酸缓冲溶液(pH=7.4)为测试母液溶液待用。测试液中,量取适量的荧光探针CP@GQDs-OH测试母液于12个5 mL容量瓶中,并加适量DMSO,使用磷酸缓冲液(pH =7.4)定容,其中分别加入适量亚硫酸氢钠。使得测试液中,探针的浓度为10 μg/mL,测试使用的亚硫酸氢钠的浓度为0、0.25、0.5、0.75、1、1.5、2.5、5、7.5、10、15、17.5 μM,其中含体积分数为5%的DMSO,进行吸收光谱测试,以波长为横坐标,以吸光度值为纵坐标做图2。由图2可知,随着亚硫酸氢钠浓度的增加,310、590nm处吸光度逐渐降低,390 nm处的吸光度逐渐增强,当亚硫酸氢钠浓度达到17.5 μM时,反应体系达到饱和状态。
实施例3 荧光探针CP@GQDs-OH对不同浓度的亚硫酸氢钠的检测
配制浓度为1mg/mL的实施例1所得荧光探针CP@GQDs-OH的磷酸缓冲溶液(pH=7.4)为测试母液溶液待用。配制探针终浓度为10 μg/mL,含5 % DMSO溶液的PBS溶液,分别与不同浓度的亚硫酸氢钠(0、0.5、0.75、1、1.25、1.5、2、2.5、3.5、5、6、7.5、10、12.5、15、17.5 μM)充分作用,进行荧光检测(λex =390 nm,λem=460、520、650 nm),得各体系中荧光强度,建立荧光强度与亚硫酸氢钠浓度标准曲线,如图3所示。由图3可知,随着亚硫酸氢钠浓度的增加,460、620nm处的荧光强度逐渐增加,650 nm处的荧光强度逐渐降低,当亚硫酸氢钠浓度达到17.5 μM时,反应体系荧光强度达到饱和状态。
实施例4 荧光探针CP@GQDs-OH对不同离子和活性小分子、氨基酸的选择性
配制浓度为1mg/mL的实施例1所得荧光探针CP@GQDs-OH的磷酸缓冲溶液(pH=7.4)为测试母液溶液待用。配制浓度为100 mM的氯化铝、氯化钡、氯化钙、半胱氨酸、谷胱甘肽、同型半胱氨酸、硝酸钾、氯化钾、磷酸钠、硫化钠、氟化钠、乙酸钠、亚硫酸氢钠的水溶液作为各离子母液备用。测试液中,量取适量的荧光探针CP@GQDs-OH测试母液于5 mL容量瓶中,并分别加上述离子母液和荧光探针CP@GQDs-OH,使用磷酸缓冲液(PBS,pH = 7.4)定容,使探针的终浓度为10 μg/mL,测试离子的浓度为1 mM,氨基酸的浓度为2 mM。摇匀后进行荧光检测(λex =390 nm, λem=460、520、650 nm),建立荧光强度与各离子的柱状图,如图4,1-14号加入的离子分别是氯化铝、氯化钡、氯化钙、半胱氨酸、谷胱甘肽、同型半胱氨酸、硝酸钾、氯化钾、磷酸钠、硫化钠、氟化钠、乙酸钠、亚硫酸氢钠、探针CP@GQDs-OH溶液。由图4可以发现,其他离子 (或氨基酸) 对探针NC-SO2的荧光几乎没有影响。
实施例5 荧光探针CP@GQDs-OH的细胞成像测试
配制浓度为1mg/mL的实施例1所得荧光探针CP@GQDs-OH的磷酸缓冲溶液(pH=7.4)为测试母液溶液待用。将适当密度的HeLa细胞接种到两个灭菌的35 mm成像培养皿中,在CO2培养箱(温度为37 ℃,5 % CO2)中培养,待细胞贴壁后,其中一个培养皿中加入荧光探针CP@GQDs-OH母液,使其终浓度均为10 μg/mL,继续培养0.5 h,弃掉培养基,用PBS缓冲液冲洗细胞3次。另外一个培养基加入适量亚硫酸氢钠水溶液,终浓度为20 μM,孵育0.5 h后,加入荧光探针CP@GQDs-OH母液,使其终浓度均为10 μg/mL,继续培养0.5 h,弃掉培养基,用PBS缓冲液冲洗细胞3次,随后进行成像实验,如图5所示,其中,a)-e) HeLa 细胞孵育探针30 min后的成像照片;f)-j) HeLa细胞孵育亚硫酸氢钠30 min后,再孵育探针30 min的成像。由图5可知,只加入探针时,细胞具有很强的红色荧光,加入亚硫酸氢钠后,细胞红色荧光消失,产生强烈的蓝色荧光信号。
实施例6 荧光探针CP@GQDs-OH的斑马鱼成像测试
配制浓度为1mg/mL的实施例1所得荧光探针CP@GQDs-OH的磷酸缓冲溶液(pH=7.4)为测试母液溶液待用。将脱卵3天的斑马鱼分为两组,分别放入35 mm培养皿中。其中一组加入荧光探针CP@GQDs-OH母液,使其终浓度均为10 μg/mL;另一组加入加入适量亚硫酸氢钠水溶液,终浓度为20 μM,培养10 min后加入荧光探针CP@GQDs-OH母液,使其终浓度均为10μg/mL,分别在28 °C下培养30 min,PBS缓冲液冲洗3次,共聚焦显微镜下成像,如图6所示,其中,a)-e) 斑马鱼孵育探针30 min后的成像照片;f)-j) 斑马鱼孵育亚硫酸氢钠30 min后,再孵育探针30 min的成像。激发波长:405 nm,发射波段:425 - 475 nm、500-550nm和570-620 nm。由图6可知,只加入探针时,斑马鱼具有很强的红色荧光,加入亚硫酸氢钠后,细胞红色荧光消失,产生强烈的蓝色荧光信号。
Claims (3)
1.一种羟基化石墨烯量子点负载2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯的复合物的制备方法,其特征在于,包括以下步骤:
(1)羟基化石墨烯量子点的合成:将1,3,6-三硝基芘1.5g超声分散于35mL 0.2M NaOH水溶液中,并转移至反应釜中180℃加热10h,过滤除去难溶物后,以透析提纯得到羟基化石墨烯量子点的水溶液,烘干后得到黑色羟基化石墨烯量子点粉末;
(2)合成2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯;
(3)室温下将10mg 2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯加入装有10mL二甲基亚砜的离心管中,得到2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯的二甲基亚砜溶液;
(4)10mg羟基化石墨烯量子点分散于装有10mL pH=7.4磷酸缓冲溶液的烧瓶中,室温下超声分散30 min,得到羟基化石墨烯量子点的磷酸缓冲溶液;
(5)在0℃下,将2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯的二甲基亚砜溶液和羟基化石墨烯量子点的磷酸缓冲溶液按照体积比4:1的比例混合,超声分散30min后室温搅拌2h,得到浓度为1mg/mL羟基化石墨烯量子点负载2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯的复合物的二甲基亚砜/水溶液。
2.一种如权利要求1所述的制备方法获得的羟基化石墨烯量子点负载2-(N,N-二乙胺基)-7-(N,N-二乙胺基)香豆素并[4,3-b]色烯的复合物。
3.一种如据权利要求2所述的复合物在制备检测溶液、细胞或生物体中二氧化硫、亚硫酸盐或亚硫酸氢盐的试剂中应用。
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