CN113155816A - 一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法 - Google Patents
一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法 Download PDFInfo
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Abstract
本发明公开了一种基于金纳米簇‑二氧化锰纳米片的甲基对氧磷荧光‑比色方法,通过简单方法合成了AuNCs‑MnO2复合材料,MnO2NSs可有效猝灭AuNCs的荧光。硫代乙酰胆碱在乙酰胆碱酯酶的催化下生成硫代胆碱,硫代胆碱可将MnO2还原生成Mn2+,从而失去荧光猝灭能力,AuNCs荧光得以恢复,再通过甲基对氧磷对乙酰胆碱酯酶的不可逆抑制,使体系中AuNCs再次猝灭,从而根据荧光强度的变化构建甲基对氧磷的分析方法。在甲基对氧磷浓度为0.0005~10ng mL‑1范围时,甲基对氧磷浓度的对数与抑制效率(IE%)有良好的线性关系(R2=0.992),检测限(LOD)为0.00037ng mL‑1。本发明灵敏度高、选择性较好、抗干扰能力较强,为农药检测建立新方法,在环境检测、食品分析等方面有着巨大应用前景。
Description
技术领域
本发明属于生物传感器技术领域,具体涉及一种基于金纳米簇(AuNCs)锚定二氧化锰纳米片(MnO2 NSs)复合材料的制备方法,并建立了乙酰胆碱酯酶(AChE)介导的甲基对氧磷荧光-比色检测分析方法。
背景技术
有机磷农药因其具有施药简单、药效时间长和杀灭隐藏害虫等优点,被广泛应用于现代农产品种植过程中。甲基对硫磷为有机磷农药的一种,是杀虫谱广的高毒杀虫剂。在空气中,甲基对硫磷在太阳照射下可氧化成为毒性更强的甲基对氧磷(Methyl-paraoxon,MP)。MP可抑制人体乙酰胆碱酯酶(Acetyl cholinesterase,AChE)的活性,导致乙酰胆碱(Acetylcholine,Ach)积聚,从而增加患神经系统疾病的风险。目前,对毒性更强、潜在危害更大的MP关注较少。因此,对甲基对硫磷代谢产物甲基对氧磷的残留检测至关重要。传统检测有机磷农药的方法主要有气相色谱法、气相色谱-质谱联用技术、液相色谱法、液相色谱-质谱联用技术、胶束电动色谱等,虽然这些方法有检出限低、准确度高、选择性好等优点,但也有前处理操作复杂、耗时长、成本高、对检测人员要求高等缺点,因此很难实现短时大批量检测。荧光分析方法所具有简捷、灵敏、快速等独特优势,可解决传统检测方法存在的缺点,也是有机磷农药检测领域的研究热点。羧基荧光素、罗丹明衍生物等荧光小分子探针和量子点、碳点等荧光纳米材料都已应用到有机磷农药的检测中,但这些荧光物质存在一些缺点如水溶性差、合成条件苛刻,直接利用这些荧光物质构建的检测有机磷农药方法存在选择性低、灵敏度低等问题。为解决上述问题,利用合成简单的纳米材料构建农药快速检测方法成为有效途径,其原理为利用纳米材料猝灭探针荧光,结合材料与有机磷农药间的作用使荧光恢复,进而实现有机磷农药检测。
发明内容
本发明的目的是为了解决现有技术存在的操作复杂、灵敏度低等问题,提供了一种金纳米簇(AuNCs)锚定二氧化锰纳米片(MnO2 NSs)复合材料的简单合成方法,将其利用于甲基对氧磷的荧光检测方法中,并建立荧光-比色双信号输出模式,结合AChE的特异响应和甲基对氧磷对AChE的抑制作用引起复合材料的荧光变化,同时伴随体系颜色发生明显变化,实现了对甲基对氧磷的快速可视化监测和高效灵敏检测,为这类传感器在农药中的应用提供新方法。
本发明的目的可通过如下技术方案实现:
一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色方法,其步骤如下:
A、牛血清白蛋白功能化的金纳米簇AuNCs的制备:
将HAuCl4(10mmol L-1)和BSA(50mg mL-1)放于37℃温育10min,按体积比1:1混合,剧烈搅拌2-5min;将NaOH(1mol L-1)相比于上述混合溶液1:20加入到上述溶液中,于37℃下剧烈搅拌反应12小时,即可获得黄色AuNCs溶液,通过透析(1kDa)进行纯化,冷冻抽干获得黄色AuNCs粉末,超纯水溶解稀释至0.20mg mL-1备用。
B、AuNCs-MnO2纳米片复合材料的制备:
将步骤A的AuNCs溶液与超纯水按照体积比20:77混合,缓慢搅拌5min;然后将MnCl2·4H2O(50mmol L-1)相比于上述混合溶液2:97加入到上述溶液中,缓慢搅拌1小时;随后将NaOH(1mol L-1)相比于上述混合溶液1:99加入到上述溶液中,缓慢搅拌反应4小时,得到棕黄色AuNCs-MnO2复合材料溶液,通过透析(1kDa)进行纯化,放置于4℃备用。
C、甲基对氧磷的荧光-比色分析:
在多个1.5mL离心管中分别加入25μL不同浓度的甲基对氧磷、25μL乙酰胆碱酯酶(AChE,80mU mL-1)混匀,在37℃下300rpm反应40min;然后加入25μL硫代乙酰胆碱(ATch,2mmol L-1)、25μL Tris-HCl缓冲液(pH=8.0,100mmol L-1)混匀,在37℃下300rpm反应25min;随后加入50μL步骤B的AuNCs-MnO2、25μL Tris-HCl缓冲液(pH=8.0,100mmol L-1)、300μL超纯水混匀,在37℃下300rpm反应15min;最后用荧光分光光度计、紫外分光光度计进行检测并记录,进行颜色拍照。
本发明机理如下:
AuNCs-MnO2复合材料中,MnO2纳米片可有效猝灭AuNCs的荧光。硫代乙酰胆碱在乙酰胆碱酯酶的催化下生成硫代胆碱,硫代胆碱可将MnO2还原生成Mn2+,使AuNCs荧光恢复,再通过甲基对氧磷对乙酰胆碱酯酶的不可逆抑制,构建甲基对氧磷荧光分析方法。本荧光分析方法利用简单方法合成了水溶性好、发光稳定的AuNCs-MnO2,借助酶的特异性,使本方法有灵敏度高、选择性较好的特点。
本发明提供的这种酶介导的荧光检测方法,为农药检测建立新方法,为现场快检提供新思路,在环境检测、食品分析方面展现出巨大的应用前景。
附图说明
图1:实施例4所述,为基于AuNCs-MnO2复合材料检测甲基对氧磷的原理示意图。
图2:实施例4所述,为本方法的可行性验证,AuNCs-MnO2、AuNCs-MnO2+ATch、AuNCs-MnO2+AChE、AuNCs-MnO2+ATch+AChE和AuNCs-MnO2+ATch+AChE+Methyl-paraoxon的荧光光谱。
图3:实施例3所述,基于AuNCs-MnO2 NPs复合材料实现AChE的有效检测。为在AuCNs-MnO2+ATch体系在加入不同浓度AChE(0、1、2、5、10、20、40和80mU mL-1)的荧光光谱。
图4:实施例3所述,为(F–F0)/F0与AChE浓度的线性关系图。
图5:实施例3所述,为在AuNCs-MnO2+ATch体系在加入不同浓度AChE(0、1、2、5、10、20、40和80mU mL-1)的吸收光谱。
图6:实施例3所述,为AuNCs-MnO2+ATch体系在加入不同浓度AChE(0、1、2、10、40、80、100、200、400和600mU mL-1)在自然光下照片。
图7:实施例4所述,基于AuNCs-MnO2 NPs复合材料传感平台实现甲基对氧磷的荧光-比色分析,为在AuNCs-MnO2+ATch+AChE体系中加入不同浓度甲基对氧磷标准液(0、0.01、1.0、20、50、500、2000和4000ng mL-1)对应的荧光光谱。
图8:实施例4所述,为IE(%)与甲基对氧磷浓度对数的线性关系图。
图9:实施例4所述,为在AuNCs-MnO2+ATch+AChE体系在加入不同浓度甲基对氧磷标准液(0、0.01、0.5、1.0、20、50、500、2000和4000ng mL-1)的吸收光谱。
图10:实施例4所述,为AuNCs-MnO2+ATch+AChE体系在加入不同浓度甲基对氧磷标准液(0、0.1、1.0、5.0、20、100、500、1000、2000和4000ng mL-1)在自然光下照片。
图11:实施例4所述,为本分析方法检测甲基对氧磷(4μg mL-1)的特异性(其它农药浓度为10μg mL-1)。
图12:实施例4所述,为其他物质(10μg mL-1)对本分析方法检测甲基对氧磷(4μgmL-1)的干扰反应。
具体实施方式
下面结合附图对本发明做进一步地说明。
实施例1:牛血清白蛋白功能化的金纳米簇AuNCs的制备
将5mL的HAuCl4(10mmol L-1)和5mL的BSA(50mg mL-1)放于37℃温育10min,将两者混合,剧烈搅拌5min。将0.5mL的NaOH(1mol L-1)加入到上述溶液中,于37℃下剧烈搅拌反应12小时,即可获得黄色AuNCs溶液,通过透析(1kDa)进行纯化,冷冻抽干获得黄色AuNCs粉末,超纯水溶解稀释至0.20mg mL-1备用。
实施例2:AuNCs-MnO2纳米片复合材料的制备
取实施例1的2mL AuNCs溶液加入到7.7mL超纯水中,缓慢搅拌5min。然后,将0.2mLMnCl2·4H2O(50mmol L-1)加入到上述溶液中,缓慢搅拌1小时;随后加入0.2mL NaOH(1molL-1),缓慢搅拌反应4小时,得到棕黄色AuNCs-MnO2复合材料溶液,通过透析(1kDa)进行纯化,放置于4℃备用。
实施例3:乙酰胆碱酯酶的荧光-比色传感设计
检测AuNCs-MnO2复合荧光体系对AChE的敏感性,将2mmol L-1的ATch与不同浓度的AChE(0~1000mU mL-1)混匀,在37℃下混合反应25min,随后加入50μL实施例2的AuNCs-MnO2混匀,在37℃下混合反应15min。随着AChE的浓度增加,AuNCs-MnO2的荧光强度逐渐增加(图3),吸收光逐渐降低(图5),体系颜色逐渐变浅(图6)。荧光恢复率((F–F0)/F0,其中F和F0表示AChE存在和不存在时的荧光强度)与AChE的浓度在1~80mU mL-1范围内有良好的线性关系(R2=0.999)(图4)。
实施例4:甲基对氧磷的荧光-比色分析
基于酶的特异性识别调控的AuNCs-MnO2荧光-比色传感平台,构建甲基对氧磷检测体系(图1)。在多个1.5mL离心管中分别加入25μL不同浓度的甲基对氧磷、25μL乙酰胆碱酯酶(AChE,80mU mL-1)混匀,在37℃下300rpm反应40min。然后加入25μL硫代乙酰胆碱(ATch,2mmol L-1)、25μL Tris-HCl缓冲液(pH=8.0,100mmol L-1)混匀,在37℃下300rpm反应25min。由于加入的甲基对氧磷浓度不同,生成的硫代胆碱量不同。将上述反应液与50μL实施例2的AuNCs-MnO2、25μL Tris-HCl缓冲液(pH=8.0,100mmol L-1)、300μL超纯水混匀,在37℃下300rpm反应15min,最后用荧光分光光度计、紫外分光光度计进行检测并记录,进行颜色拍照。本方法原理可行(图2),甲基对氧磷浓度与AuNCs-MnO2荧光强度成反比关系,荧光强度随着甲基对氧磷的浓度增加而降低(图7),吸收光逐渐升高(图9),体系颜色逐渐变深(图10)。在甲基对氧磷浓度为0.005~10ng mL-1范围内,甲基对氧磷浓度的对数与抑制效率(IE%)有良好的线性关系(R2=0.992)(图8),检测限(LOD)为0.000892ng mL-1,可满足甲基对氧磷的检测。而且,本发明构建的方法对新烟碱类农药(氯噻啉、烯啶虫胺)、氨基甲酸酯类农药(西维因)、氯化烟碱类农药(啶虫脒、吡虫啉)均没有相应,对有机磷农药(水胺硫磷、毒死蜱、马拉硫磷)相应很弱,只有甲基对氧磷(4μg mL-1)可引起显著的变化(图11),表明该方法对甲基对氧磷具有较高选择性。如图12所示,样品中常见阳离子(Na+、K+、Mg2+)、氨基酸(精氨酸、甘氨酸、苏氨酸)、蛋白质(BSA)等不会显著影响检测体系的荧光强度变化,表明该方法具有良好的抗干扰能力。
实施例5:实际样品中甲基对氧磷含量的测定
利用本发明,采用标准加入法,对环境和食品样品中的甲基对氧磷进行检测,探讨其实用性。具体样品包括自来水、河水和橙汁,自来水与河水利用0.22μm滤膜过滤后,直接添加甲基对氧磷标准液,终浓度分别为0.1、1和5ng mL-1;橙汁12000rpm离心10min,取上清液稀释25倍添加甲基对氧磷标准液,终浓度分别为0.1、1和5ng mL-1,并利用本发明开发的荧光方法进行检测。如表1所示,实际样品中甲基对氧磷的添加回收率为90.3-116%,相对标准偏差(RSD)小于8.73%,表明该检测方法可应用于实际样品检测中。
表1:应用本发明开发的荧光-比色策略检测实际样品中的甲基对氧磷
Claims (7)
1.一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于,其步骤如下:
A、牛血清白蛋白功能化的金纳米簇(AuNCs)的制备:
将HAuCl4和BSA放于按体积比1:1混合,剧烈搅拌2-5min;将NaOH相比于上述混合溶液1:20加入到上述溶液中,于37℃下剧烈搅拌反应12小时,即可获得黄色AuNCs溶液,通过透析进行纯化,冷冻抽干获得黄色AuNCs粉末,超纯水溶解稀释至0.20mg mL-1备用;
B、AuNCs-MnO2纳米片复合材料的制备:
将步骤A的AuNCs溶液与超纯水按照体积比20:77混合,缓慢搅拌5min;然后将MnCl2·4H2O相比于上述混合溶液2:97加入到上述溶液中,缓慢搅拌1小时;随后将NaOH相比于上述混合溶液1:99加入到上述溶液中,缓慢搅拌反应4小时,得到棕黄色AuNCs-MnO2荧光复合材料溶液,通过透析进行纯化备用;
C、甲基对氧磷的荧光-比色分析:
在多个1.5mL离心管中分别加入25μL不同浓度的甲基对氧磷、25μL乙酰胆碱酯酶(AChE,80mU mL-1)混匀,在37℃下300rpm反应40min;然后加入25μL硫代乙酰胆碱(ATch,2mmol L-1)、25μL Tris-HCl缓冲液混匀,在37℃下300rpm反应25min;随后加入50μL步骤B的AuNCs-MnO2、25μL Tris-HCl缓冲液、300μL超纯水混匀,在37℃下300rpm反应15min;最后用荧光分光光度计、紫外分光光度计进行检测并记录,进行颜色拍照。
2.如权利要求1所述的一种基于金纳米簇锚定二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于,步骤A所述的HAuCl4的浓度为10mmol L-1,BSA的浓度为50mg mL-1,NaOH的浓度为1mol L-1。
3.如权利要求1所述的一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于HAuCl4及BSA需提前在37℃下温育10min,整个合成过程在37℃下进行。
4.如权利要求1所述的一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于,步骤B所述的MnCl2·4H2O的浓度为50mmol L-1,NaOH的浓度为1mol L-1。
5.如权利要求1所述的一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于,步骤C所述的Tris-HCl缓冲液pH为8.0,浓度为100mmol L-1。
6.如权利要求1所述的一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于,步骤C使用激发波长560nm进行荧光检测,最佳发射波长位于665nm处。
7.如权利要求1所述的一种基于金纳米簇-二氧化锰纳米片的甲基对氧磷荧光-比色分析方法,其特征在于,步骤C进行吸收光谱检测的扫描范围为300-750nm。
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CN117447992B (zh) * | 2023-10-30 | 2024-03-26 | 河北科技大学 | 一种纳米金-二氧化锰纳米荧光探针及其制备方法与应用 |
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