CN112304913B - 一种检测Hg2+荧光生物传感器及检测Hg2+的方法与应用 - Google Patents
一种检测Hg2+荧光生物传感器及检测Hg2+的方法与应用 Download PDFInfo
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Abstract
本发明涉及传感器技术领域,特别涉及目标金属介导临近触发劈开金属DNAzyme催化裂解性能、催化发夹自组装放大反应的一种检测Hg2+的荧光生物传感器,还涉及其制备方法与应用。利用了碱基T与Hg2+之间特异性结合的特性进行检测;利用了DNAzyme的裂解循环和催化发夹自组装扩增反应起到了信号放大的作用,提高了检测的灵敏度;制备方法简单,性能稳定,适用于食品、土壤及饮用水中Hg2+的检测;制备过程的工艺成本低,适用于产业化中价廉的要求。
Description
技术领域
本发明涉及传感器技术领域,特别涉及目标金属介导临近触发劈开金属DNAzyme催化裂解性能、催化发夹自组装放大反应的一种检测Hg2+的荧光生物传感器,还涉及其检测Hg2+的方法与应用。
背景技术
重金属污染已成为世界性的农业生态环境问题,严重威胁着现代农业、生态安全,尤其是粮食安全。一些重金属,如镉、铅、汞和砷,即使在微量水平上也被认为是剧毒和有害于人类健康的。它们可能会进入土壤和地下水,在动物和植物中积累生物,然后通过食物链进入人体。重金属离子中,汞离子(Hg2+)毒性强,在环境中广泛存在。Hg2+暴露后可引起多种不良的健康影响,如脑损伤、肾功能衰竭、免疫系统紊乱、肌肉无力、四肢瘫痪等。世界卫生组织(WHO)允许饮用水中汞的最高水平为6 ppb。因此,开发快速、痕量、高灵敏度和选择性的检测 Hg2+的分析方法是十分必要的。
发明内容
为了实现更加灵敏、特异性的检测Hg2+,本申请提出了一种目标金属介导临近触发金属DNAzyme的催化裂解性能和催化发夹自组装放大策略检测Hg2+的荧光生物传感器。
本发明的技术方案如下:
一种检测Hg2+的荧光生物传感器,包括触发链T1、触发链T2、发夹H1、发夹H2、发夹H3、发夹H4、目标物Hg2+和荧光素ThT;
所述的触发链T1序列如SEQ-ID-NO.1所示,具体为:5’-TCTCTTGGCACCCATGTAGCAGG-3’;
所述的触发链T2序列如SEQ-ID-NO.2所示,具体为:5’-AGTGGGTCAGCGATCCTTGTGT-3’;
所述的发夹H1序列如SEQ-ID-NO.3所示,具体为:5’-TGGGTAGGGCGGGTTGGGCCTGCT(rA)GCACCCACTTTCTCACCCAACAACCCGCG-3’;
所述的发夹H2序列如SEQ-ID-NO.4所示,具体为:5’-AGTGGGTCAGCGATGGTTGTTGGGTGAGAAAGTGGGTGCACCCACAAGAC CACCCACTTTCTCACCCATGTAGCAGG-3’;
所述的发夹H3序列如SEQ-ID-NO.5所示,具体为:5’-AGTGGGTCAGCGATAGAAAGTGGGTGGTCTTGTGGGTGCACCCAACAACCCAC CCACAAGACCACCCATGTAGCAGG-3’;
所述的发夹H4序列如SEQ-ID-NO.6所示,具体为:5’-AGTGGGTCAGCGATGTCTTGTGGGTGGGTTGTTGGGTGCACCCACTTTCTCACC CAACAACCCACCCATGTAGCAGG-3’;
所述的发夹H1的5’端第24个碱基上含有rA。
上述荧光生物传感器检测Hg2+的方法,其特征在于,包括以下步骤:
(1)均相反应:将Hg2+、T1、T2、H1、H2、H3、H4和ThT混合,反应;
(2)荧光仪检测荧光强度。
优先地,所述的步骤(1)均相反应条件为: 37℃下水浴90 min。
优先地,所述的步骤(2)荧光仪设置激发波长为425nm,发射波长设置为485nm,检测范围设置450-620nm。
上述检测Hg2+的荧光生物传感器在检测水中或食品中Hg2+的应用。
该发明的检测方式是荧光检测,基于碱基T会特异性地与目标物Hg2+结合形成稳定的T-Hg2+-T结构,使得两条含有劈开金属DNAzyme序列的T1、T2临近,触发Mg2+金属DNAzyme的作用,在Mg2+存在时与H1杂交,将H1裂解为S1、S2,其中S2是一段G-rich的序列嵌入ThT后产生荧光信号,而S1可作为次级触发器,触发H2、H3和H4的催化发夹自组装形成三通路,三通路的两端临近又会形成金属DNAzyme,其进一步与H1杂交裂解释放S1、S2,以此循环进行,进而产生更多的S2产生更高的荧光信号。
本发明基于碱基T与Hg2+之间特异性的结合能力,以及DNAzyme的裂解循环和催化发夹自组装扩增反应实现信号放大,实现对目标物灵敏检测的生物传感器。该传感器具有检测速度快,检测限低,灵敏度高等优点,可以弥补 Hg2+现有检测方法的缺陷与不足,实现对其快速,准确的定量检测。
本发明的有益效果:
1、检测灵敏度高
利用了碱基T与Hg2+之间特异性结合的特性进行检测;利用了DNAzyme的裂解循环和催化发夹自组装扩增反应起到了信号放大的作用,提高了检测的灵敏度;
2、反应条件温和
该传感器的反应条件温和,反应速度快;检测原理的主要过程均是在均相溶液中实现的,提高了反应速度,降低了操作的复杂程度,实现了目标物的快速,简单,灵敏的检测;
3、方法简单,易于工业化生产
制备方法简单,性能稳定,适用于食品、土壤及饮用水中Hg2+的检测;制备过程的工艺成本低,适用于产业化中价廉的要求。
附图说明
图1为该实验的原理图;
图2为实施例1检测结果图;
图3为实施例2检测结果图;
图4为实施例3检测结果图;
图5为实施例4传感器检测Hg2+的标准曲线。
具体实施方式
下面结合具体实施例对本发明进行进一步说明。
实施例1
均相反应操作步骤如下:
将Hg2+(3 µL)、T1(3 µL)、T2(3 µL)、H1(100 nM、200 nM、350 nM 、500 nM、 1 µM、1.2 µM)、H2(3 µL)、H3(3 µL)、H4(3 µL)和ThT(3 µL)加到灭菌的离心管中,震荡20-30s,于37℃下水浴90 min。
荧光仪检测荧光强度主要步骤如下:
将均相反应后的溶液稀释至100 µL,用荧光仪在485 nm处检测荧光。荧光仪激发波长设置为425 nm,发射波长设置为485 nm,检测范围450 nm—620 nm,读取荧光信号变化,检测目标物。
结果见图2,从图中可以看出,随着H1浓度的增加,实验得到的荧光强度不断增强,在H1的浓度达到1 µM之后,荧光强度基本不变。说明最适的H1浓度是1 µM。
实施例2
均相反应操作步骤如下:
将Hg2+(3 µL)、T1(3 µL)、T2(3 µL)、H1(3 µL)、H2(100 nM、200 nM、500 nM、800nM、 1 µM、1.2 µM)、H3(3 µL)、H4(3 µL)和ThT(3 µL)加到灭菌的离心管中,震荡20-30s,于37℃下水浴90 min。
荧光仪检测荧光强度主要步骤如下:
将均相反应后的溶液稀释至100 µL,用荧光仪在485 nm处检测荧光。荧光仪激发波长设置为425 nm,发射波长设置为485 nm,检测范围450 nm—620 nm,读取荧光信号变化,检测目标物。
结果见图3,从图中可以看出,随着H2浓度的增加,实验得到的荧光强度不断增强,在H2的浓度达到800 nM之后,荧光强度基本不变。说明最适的H2浓度是800 nM。
实施例3
均相反应操作步骤如下:
将Hg2+(3 µL)、T1(3 µL)、T2(3 µL)、H1(3 µL)、H2(3 µL)、H3(3 µL)、H4(3 µL)和ThT(1 µM、4 µM、8 µM、10 µM、12 µM、14µM)加到灭菌的离心管中,震荡20-30s,于37℃下水浴90 min。
荧光仪检测荧光强度主要步骤如下:
将均相反应后的溶液稀释至100 µL,用荧光仪在485 nm处检测荧光。荧光仪激发波长设置为425 nm,发射波长设置为485 nm,检测范围450 nm—620 nm,读取荧光信号变化,检测目标物。
结果见图4,从图中可以看出,随着ThT浓度的增加,实验得到的荧光强度不断增强,在ThT的浓度达到10 µM之后,荧光强度基本不变。说明最适的ThT浓度是10 µM。
实施例4
均相反应操作步骤如下:
将灭菌水、缓冲液、Hg2+(浓度分别为0pM、1 pM、5 pM、10 pM、50 pM、100 pM、500pM、1000 pM、5000 pM、10000pM、)、T1(3 µL)、T2(3 µL)、H1(3 µL)、H2(3 µL)、H3(3 µL)、H4(3 µL)和ThT(3 µL)加到灭菌的离心管中,震荡20-30s,于37℃下水浴2h。
荧光仪检测荧光强度主要步骤如下:
将均相反应后的溶液稀释至100 µL,用荧光仪在485nm处检测荧光。荧光仪激发波长设置为425nm,发射波长设置为485nm,检测范围450—620nm,读取荧光信号变化,检测目标物。
检测结果如图5所示,从图中可以看出,检测到的荧光强度峰值随着Hg2+浓度的增大而增大,得到荧光强度与Hg2+浓度的对数的线性曲线,获得回归方程为y=147.17LogC +165.92,相关系数为98.9%,由此计算优化后的生物传感器的检测限为1.33 pM。
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实施例的限制,其它任何未背离本发明的精神实质与原理下所做的改变、修饰、组合、替代、简化均应为等效替换方式,都包含在本发明的保护范围之内。
序列表
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<120> 一种检测Hg2+荧光生物传感器及其制备方法与应用
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Claims (5)
1.一种检测Hg2+的荧光生物传感器,其特征在于,包括触发链T1、触发链T2、发夹H1、发夹H2、发夹H3、发夹H4、目标物Hg2+和荧光素ThT;
所述的触发链T1序列如SEQ-ID-NO.1所示,具体为:5’-TCTCTTGGCACCCATGTAGCAGG-3’;
所述的触发链T2序列如SEQ-ID-NO.2所示,具体为:5’-AGTGGGTCAGCGATCCTTGTGT-3’;
所述的发夹H1序列如SEQ-ID-NO.3所示,具体为:5’-TGGGTAGGGCGGGTTGGGCCTGCT(rA)GCACCCACTTTCTCACCCAACAACCCGCG-3’;
所述的发夹H2序列如SEQ-ID-NO.4所示,具体为:5’-AGTGGGTCAGCGATGGTTGTTGGGTGAGAAAGTGGGTGCACCCACAAGAC CACCCACTTTCTCACCCATGTAGCAGG-3’;
所述的发夹H3序列如SEQ-ID-NO.5所示,具体为:5’-AGTGGGTCAGCGATAGAAAGTGGGTGGTCTTGTGGGTGCACCCAACAACCCAC CCACAAGACCACCCATGTAGCAGG-3’;
所述的发夹H4序列如SEQ-ID-NO.6所示,具体为:5’-AGTGGGTCAGCGATGTCTTGTGGGTGGGTTGTTGGGTGCACCCACTTTCTCACC CAACAACCCACCCATGTAGCAGG-3’;
所述的发夹H1的5’端第24个碱基上含有rA。
2.一种利用如权利要求1所述的荧光生物传感器检测Hg2+的方法,其特征在于,包括以下步骤:
(1)均相反应:将Hg2+、T1、T2、H1、H2、H3、H4和ThT混合,反应;
(2)荧光仪检测荧光强度。
3.根据权利要求2所述的荧光生物传感器检测Hg2+的方法,其特征在于,所述的步骤(1)均相反应条件为: 37℃下水浴90 min。
4.根据权利要求2所述的荧光生物传感器检测Hg2+的方法,其特征在于,所述的步骤(2)荧光仪设置激发波长为425nm,发射波长设置为485nm,检测范围设置450-620nm。
5.权利要求1所述的检测Hg2+的荧光生物传感器在检测水中或食品中Hg2+的应用。
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