CN107748148A - 基于石墨烯氧化物双氨基固定多t序列检测汞离子的方法 - Google Patents

基于石墨烯氧化物双氨基固定多t序列检测汞离子的方法 Download PDF

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CN107748148A
CN107748148A CN201710784190.4A CN201710784190A CN107748148A CN 107748148 A CN107748148 A CN 107748148A CN 201710784190 A CN201710784190 A CN 201710784190A CN 107748148 A CN107748148 A CN 107748148A
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mercury
graphene oxide
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高力
邓泽斌
黎雪琴
李娆琪
施海峰
周阳
张春霞
时海霞
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Jiangsu University
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    • G01N21/62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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    • G01N21/6428Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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    • G01N21/64Fluorescence; Phosphorescence
    • G01N21/6428Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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Abstract

本发明基于石墨烯氧化物双氨基固定多T序列检测汞离子的方法,属于环境检测领域中重金属的生物学检测方法。先利用NHS/EDC对GO进行活化,暴露出GO表面的羧基,以利于DNA序列的结合,加入双氨基的多T部分双链序列和活化GO,使得双氨基的多T序列固定化结合在GO表面。加入不同浓度的Hg2+,检测荧光强度,通过荧光强度的变化来分析汞离子浓度。本发明充分利用活化氧化石墨烯表面羧基高效固定双氨基修饰的多T序列,汞离子能与多T序列形成‑T‑Hg2+‑T‑配对,导致DNA序列构象变化,荧光强度发生相应变化。汞离子加入的量与荧光变化值呈正相关,基于此检测汞离子浓度,提高了对汞离子检测的信噪比。

Description

基于石墨烯氧化物双氨基固定多T序列检测汞离子的方法
技术领域:
本发明属于环境检测领域中重金属的生物学检测方法,基于氧化石墨烯(GO)固定双氨基化的多T序列(羧基荧光素—FAM标记),来高灵敏性检测重金属汞离子。
背景技术:
重金属离子对自然环境以及人类健康生活存在着巨大的威胁,其中的汞离子(Hg2 +)广泛分布于空气、水域、土壤之中,因而被认为是危害生态环境最严重的金属阳离子之一。一系列的自然或人为过程导致了汞离子的毒性污染,如火山喷发、采矿、固体废弃物焚烧、燃烧化石燃料等。Hg2+在生物体内富集,会造成多种疾病,如大脑肾脏损伤、严重的认知和运动功能障碍、植物神经紊乱、水俣病等。(Mingjian Yuan et al.A Colorimetric andFluorometric Dual-Modal Assay for Mercury Ion by a Molecule.Org.Lett.2007,9,2313-2316;Jianjun Du et al.Colorimetric Detection of Mercury Ions Based onPlasmonic Nanoparticles.Small.2013,9,1467-1481)。因此,对人类息息相关的生态环境中汞离子的检测是非常重要的,发展一种高效、快速、低成本检测汞离子的技术至关重要。
氧化石墨烯是石墨烯的一种衍生物,制作简单且成本较低,二维结构的氧化石墨烯表面积大,为DNA提供了众多的结合位点。使用NHS/EDC[N-羟基丁二酰亚胺、1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐]活化GO表面,使得GO表面羧基化。双氨基修饰的多T序列特异性结合在活化的GO表面,由于汞离子能与多T序列形成-T-Hg2+-T-配对,导致DNA序列形成发夹结构,FAM标记的一端远离石墨烯表面,荧光恢复,随着汞离子加入的浓度不同,荧光发生相应的变化,本实验以此来检测汞离子。
发明内容:
一种基于氧化石墨烯-多T序列传感器检测汞离子的方法,按照下述步骤进行:
(1)氧化石墨烯(GO)活化:配制含50mM NHS与200mM EDC混合液,按NHS/EDC混合液:超纯水:1mg/ml GO=1:1:2体积比例混合,常温下静置30min,洗脱。
(2)双氨基序列固定:在10mM的PBS缓冲溶液,加入部分双链的双氨基多T序列和活化10ug/ml GO,4℃,过夜,离心,去上清,再加入等体积PBS缓冲液,混匀,测量其荧光强度。
(3)汞离子检测及分析:向(2)中液体里加入不同浓度的Hg2+,混匀,静置20min,检测荧光强度,通过荧光强度的变化来分析汞离子浓度,确定该传感器的灵敏度;再于(2)中的体系中加入适量的长江水,检测其汞离子浓度。
步骤(2)中所述部分双链的双氨基多T|序列为
5’NH2-GAT AGC TTT GCT TGT TGC GCT TCT TGC TTT-FAM-3’;
|||||||
5’NH2-CTA TCG-3’。
步骤(2)中所述的GO浓度为10μg/ml。
步骤(2)中所述的双氨基的多T部分双链序列浓度为50nM。
本发明充分利用活化氧化石墨烯表面的羧基与修饰在多T序列上的双氨基特异性结合,大大增强了固定化效率。而汞离子能与多T序列形成-T-Hg2+-T-配对,导致DNA序列构象变化,形成发夹结构,FAM标记的一端远离石墨烯表面,荧光恢复。汞离子加入的量与荧光变化值呈正相关,基于此检测汞离子浓度。
本发明具有以下优点:
(1)本发明中氧化石墨烯纳米材料易于获得,方法简单、成本低。利用荧光共振能量转移(FRET)的原理,GO对DNA上的FAM荧光具有高效淬灭效率,双氨基修饰的多T列固定化效率高,利于汞离子检测。
(2)本发明基于汞离子与多T序列的特异性,引起DNA构象变化,发夹结构形成时,FAM会远离GO表面,荧光强度有不同程度回复。
(3)双氨基固定结合DNA构象变化能有效提高检测的信噪比,而实现对汞离子快速、低成本检测。
附图说明
图1该传感器检测0-10uM的汞离子的荧光图;
图2该传感器检测0-10uM汞离子的回复率图;
图3该传感器检测100nM同浓度的其它重金属离子与汞离子回复效果的对比;
图4该传感器检测主要步骤示意图;(1.离心去除未吸附的DNA;2.加入可卡因,DNA构象变化,荧光恢复;3.注释)。
具体实施方式
以下结合实施例对本发明做进一步说明,实施例是用于说明本发明,而不是用于限制本发明的范围。
实施例:
(1)合成特异的DNA序列:
多T序列1:5’NH2-GAT AGC TTT GCT TGT TGC GCT TCT TGC TTT-FAM-3’;
多T序列2:5’NH2-CTA TCG-3’。将同浓度的这两条单链序列于95度高温下五分钟,室温下静置两小时,杂交成部分双链DNA。
(2)GO活化:配制含50mM NHS与200mM EDC混合液,按NHS/EDC混合液:超纯水:1mg/ml GO=1:1:2体积比例混合,常温下静置30min,洗脱。
(3)双氨基序列固定:200μl 10mM PBS溶液,加入50nM双氨基的多T部分双链序列和10ug/ml活化GO,4℃,过夜,取出,10000rpm离心20min,去除上清液,加入等体积10mM PBS缓冲液,混匀。并测量其荧光强度。
(4)汞离子检测及分析:首先向(2)中液体里加不同浓度的Hg2+,混匀,静置20min,检测荧光强度,通过荧光强度的变化来分析该传感器的灵敏度。取适量长江水,经过滤去除其沉淀物。在200μl 10mM PBS溶液加入50nM双氨基的多T部分双链序列和10ug/ml活化GO,4℃,过夜,取出,10000rpm离心20min,去除上清液,加入200μl长江水,混匀。测量其荧光强度,分析其汞离子浓度。
序列表
<110> 江苏大学
<120> 基于石墨烯氧化物双氨基固定多T序列检测汞离子的方法
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 30
<212> DNA
<213> 2 Ambystoma laterale x Ambystoma jeffersonianum
<400> 1
gatagctttg cttgttgcgc ttcttgcttt 30
<210> 2
<211> 6
<212> DNA
<213> 2 Ambystoma laterale x Ambystoma jeffersonianum
<400> 2
ctatcg 6

Claims (4)

1.一种基于氧化石墨烯-多T序列传感器检测汞离子的方法,其特征在于按照下述步骤进行:
(1)氧化石墨烯(GO)活化:配制含50mM NHS与200mM EDC混合液,按NHS/EDC混合液:超纯水:1mg/ml GO=1:1:2体积比例混合,常温下静置30min,洗脱;
(2)双氨基序列固定:在10mM的PBS缓冲溶液,加入部分双链的双氨基多T序列和活化10ug/ml GO,4℃,过夜,离心,去上清,再加入等体积PBS缓冲液,混匀,测量其荧光强度;
(3)汞离子检测及分析:向(2)中液体里加入不同浓度的Hg2+,混匀,静置20min,检测荧光强度,通过荧光强度的变化来分析汞离子浓度,确定该传感器的灵敏度;再于(2)中的体系中加入适量的长江水,检测其汞离子浓度。
2.根据权利要求1所述的一种基于氧化石墨烯-多T序列传感器检测汞离子的方法,其特征在于步骤(2)中所述部分双链的双氨基多T|序列为
5’NH2-GAT AGC TTT GCT TGT TGC GCT TCT TGC TTT-FAM-3’;
|||||||
5’NH2-CTA TCG-3’。
3.根据权利要求1所述的一种基于氧化石墨烯-多T序列传感器检测汞离子的方法,其特征在于步骤(2)中所述的GO浓度为10μg/ml。
4.根据权利要求1所述的一种基于氧化石墨烯-多T序列传感器检测汞离子的方法,其特征在于步骤(2)中所述的双氨基的多T部分双链序列浓度为50nM。
CN201710784190.4A 2017-09-04 2017-09-04 基于石墨烯氧化物双氨基固定多t序列检测汞离子的方法 Pending CN107748148A (zh)

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