CN113804662A - 一种生鲜果蔬中专用于敌敌畏农药残留的快速检测方法 - Google Patents
一种生鲜果蔬中专用于敌敌畏农药残留的快速检测方法 Download PDFInfo
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Abstract
一种生鲜果蔬中专用于敌敌畏农药残留的快速检测方法,其属于农药残留快速检测的技术领域。基于有机磷农药和氨基甲酸酯类农药对乙酰胆碱酯酶(AChE,来源于鸭血提取)活性的特异性抑制作用,应用超高灵敏荧光素荧光探针检测其抑制程度。在这个检测体系中敌敌畏加标量相同时,敌敌畏减弱的荧光强度(I敌敌畏)比其他农药(I其他农药)要低100倍以上,显示即使敌敌畏含量低于其他农药100倍时,也可定量检测其残留量。通过对农残萃取液稀释100倍,减除其他农残对AChE的影响,实现果蔬中特异性检测敌敌畏农残范围0.02~1.2 mg/kg,检测标准曲线误差率R2>0.99;生鲜果蔬的加标回收率达到71~86%。
Description
技术领域
本发明属于农药残留快速检测领域,具体涉及AChE酶的超高灵敏荧光探针底物及其应用。
背景技术
敌敌畏(DDVP,dichlorvos)是有机磷杀虫剂的一种,杀虫谱广,药效迅速,具有胃毒、触杀和熏蒸作用,可防治菜青虫、小菜蛾、蚜虫、菜螟、黄曲条跳甲、黏虫、甘蓝夜蛾、斜纹夜蛾、红蜘蛛、大猿叶虫等,对害虫击倒力强而快,常被用于蔬菜瓜果临近收获时害虫的防治。如果临近果蔬采摘前、或超量使用敌敌畏,易造成残留超标对人体造成危害。近些年市场监管部门时有敌敌畏在苹果、梨、芹菜、西红柿等果蔬中残留超标的报道,因此,开发一种可便利、准确、快速检测果蔬中敌敌畏残留量检测方法显得十分必要。
农药残留检测技术主要分为传统检测和快速检测。传统检测主要涉及气相色谱、液相色谱及其和质谱技术的联用,检测成本高、耗时长,不利于大范围、高通量展开。近年发展起来的荧光探针技术应用于酶抑制原理,可实现高通量、广谱、快速检测农残。中国发明专利(ZL201810408171.6)以罗丹荧为母体合成了可检测乙酰胆碱酯酶(AChE)活性的荧光探针NDRO-1,基于酶抑制原理开发了可快速检测有机磷和氨基甲酸酯类农药方法。有机磷和氨基甲酸酯类农药对AChE酶都具有一定的抑制能力,这类基于酶抑制原理的检测方法,还难于实现对果蔬中敌敌畏农残的专项检测。国家标准GB/T5009.199-2003(蔬菜中有机磷和氨基甲酸酯类农药残留的快速检测,水解底物为乙酰胆碱)中农残检出限为:甲胺磷2.0mg/kg、敌敌畏0.1mg/kg、呋喃丹0.05mg/kg;本专利申请人发表的硕士论文(张淑芳,鸭血胆碱酯酶近红外荧光检测探针的研究,2018年,水解底物为荧光探针)中农残检出限为:甲胺磷0.03mg/L、敌敌畏0.2µg/L、呋喃丹0.02mg/L。分别应用胆碱酯和荧光探针2种底物建立的检测方法所得到的农残检测限巨大差异,显示2种底物所作用的AChE酶活性中心位点不同,并且利用荧光探针方法中超低的敌敌畏检测限,改进检测方法应用于专项检测敌敌畏农残成为可能。
发明内容
本发明的目的在于提供一种AChE酶(从鸭血中提取)的荧光检测探针在敌敌畏专项农残检测中的应用。该底物原型和水解产物的荧光属性具有明显差异,且产物荧光具有更高的灵敏度。利用该探针可对AChE快速检测方法,间接实现敌敌畏农残的定量检测。利用荧光探针方法中超低的敌敌畏检测限,改进检测方法应用于专项检测敌敌畏农残成为可能。
本发明提供了一种AChE的荧光检测探针,该底物的酯键可以被AChE水解,生成具有荧光属性的产物。该底物结构如式-1所示。
本发明还提供了检测AChE荧光探针底物的应用。作为AChE的底物,发生水解反应,通过定量检测单位时间内水解产物的生成量来测定酶的活性;具体测定方法为:
——体系中以罗丹荧探针衍生物作为酶底物;反应体总系积为335µL,底物浓度选择1.0~20µM,单点测定时底物浓度优选10µM;AChE酶浓度为34µg/mL;
——在PBS缓冲液中,反应温度优选37oC;优选pH7.4为最优反应pH值;
——AChE酶与农残反应的预孵时间为7min;探针与酶的反应时间为12min,在确保以上底物相应的水解产物达到定量限;物转化率不超过35%时终止反应;
——反应结束后,加入200µL乙腈作为终止剂,使最后的荧光强度检测操作更简便。
间接地定量体系中敌敌畏含量的方法,包括以下步骤:
S1.将萃取的溶液稀释100倍,使待测溶液中农药的含量为0.1~6μg/L;
S2.向稀释后的萃取溶液中,加入酶剂,在恒温混匀仪37oC下,预孵反应7min;
S3.取预孵溶液加入比色皿,再加入含荧光探针的DMSO溶液,在恒温混匀仪37oC下,震荡反应;向比色皿加入终止剂,混匀,得到1号待测溶液;
S4.启动荧光检测仪;将比色皿放入检测仪,在手机APP上读取数据,保存。
S5.酶活性抑制率计算公式:抑制率(%)=[(A0–A1)/A0]·100
式中,A0为无农药的空白相对荧光强度,A1为含农药的测试组相对荧光强度;
S6.根据相对荧光强度计算抑制率,再根据抑制率计算出萃取液中敌敌畏的含量;
S7.根据测得的萃取液中敌敌畏的含量乘上稀释倍数200,得到果蔬样品中敌敌畏的含量。
该探针底物本身没有荧光,而其水解产物具有荧光属性,采用荧光快速检测仪实现产物及底物的快速灵敏检测;所述荧光检测条件为:激发波长465nm,在550~560nm进行荧光发射谱的检测。
特异性检测敌敌畏的原理为:以上方法适用于检测体系中敌敌畏加标量与其他农药加标量相同时,敌敌畏减弱的荧光强度(I敌敌畏)比其他农药(I其他农药)要低100倍以上,通过对农残萃取液稀释100倍,其他农药浓度减低至无法测定程度,进而可以减除其他农药对AChE的影响,实现特异性检测敌敌畏。
有益效果:基于有机磷农药和氨基甲酸酯类农药对乙酰胆碱酯酶(AChE,来源于鸭血提取)活性的特异性抑制作用,应用超高灵敏荧光素荧光探针检测其抑制程度。在这个检测体系中敌敌畏加标量相同时,敌敌畏减弱的荧光强度(I敌敌畏)比其他农药(I其他农药)要低100倍以上,显示即使敌敌畏含量低于其他农药100倍时,也可定量检测其残留量。通过对农残萃取液稀释100倍,减除其他农残对AChE的影响,实现特异性检测敌敌畏农残范围10~200μg/L,检测标准曲线误差率R2>0.98;生鲜果蔬的加标回收率达到80-110%。
说明书附图
图1是农药检测的机理图。
图2是敌敌畏的标准曲线图。
具体实施方式
实施例1:荧光探针底物式-1合成
合成路线:
中间体b的合成:称取2.00g荧光素a,1.71gCs2CO3,加入10mLDMF溶解,室温下搅拌,滴加0.75g(0.75mL)CH3I。反应结束后,加入5%的氢氧化钠溶液,用DCM萃取,有机相用饱和食盐水洗涤后,蒸留除去溶剂,得中间体b1.55g,产率71.4%。1HNMR(500MHz,CDCl3)δ8.24(d,J=7.9Hz,1H),7.74(t,J=7.2Hz,1H),7.67(t,J=7.6Hz,1H),7.31(d,J=7.5Hz,1H),6.97(d,J=2.3Hz,1H),6.87(dd,J=18.1,9.3Hz,1H),6.74(dd,J=8.9,2.3Hz,1H),6.54(d,J=9.7Hz,1H),6.47(s,1H),3.92(s,2H),3.64(s,1H)。
中间体c的合成:取中间体b0.800g,加入20mLCH3OH,10%的NaOH溶液5mL,室温下搅拌6h水解。蒸馏除去甲醇后,用10mL(36%浓盐酸:水=1:11)中和,用DCM萃取,除去DCM得粗品。用硅胶层析柱纯化(展开剂DCM:CH3OH=40:1),得中间体c0.40g,产率52%。1HNMR(500MHz,MeOD)δ8.02(d,J=7.7Hz,1H),7.79(td,J=7.5,1.1Hz,1H),7.74-7.69(m,1H),7.22(d,J=7.7Hz,1H),6.87(d,J=1.7Hz,1H),6.75-6.64(m,3H),6.57(dt,J=8.7,5.5Hz,2H),4.89(s,8H),3.86(s,3H),3.34(dd,J=11.3,9.7Hz,6H)。
探针式-1的合成:取中间体c40mg,加入10滴三乙胺及0.125mL乙酰氯,冰浴下搅拌,反应结束后,用DCM萃取,蒸馏除去DCM后,用硅胶层析柱纯化(展开剂DCM:CH3OH=50:1),得荧光探针式-117mg,产率37.8%。1HNMR(500MHz,CDCl3)δ8.03(d,J=7.5Hz,1H),7.66(ddt,J=14.0,7.4,3.8Hz,1H),7.18(d,J=7.6Hz,1H),7.07(t,J=7.0Hz,1H),6.88-6.75(m,1H),6.70(d,J=8.8Hz,1H),6.63(dd,J=8.8,2.5Hz,1H),5.30(s,1H),3.84(s,2H),2.49-2.19(m,2H)。
实施例2:果蔬中农残萃取方法:
蔬菜、水果的可食用部分,称取试样0.3g于2mL的离心管中,加入1.5mL萃取液(乙酸乙酯/丙酮=9:1),在震荡混合器萃取5min。离心后,取100μL上清液至2mL离心管中,吹干。加入0.6mLPBS(100mM,pH=7.4)溶解,待测。
实施例3:农残检测通用方法
1. 从前处理制备得到的0.6mL待测萃取剂(或加标农药的PBS溶液,或PBS溶液)取6µL,再用PBS(100mM,pH=7.4)稀释100倍至600µL;
2.向稀释后的萃取液300µL加入5µL酶剂(从鸭血提取,AChE蛋白含量2.3mg/ml),在恒温混匀仪37oC下,预孵反应7min;
3. 取预孵溶液300µL,加入比色皿,再加入含荧光探针(非特指为式-1荧光探针)的DMSO溶液30µL,在恒温混匀仪37oC下,震荡反应12min;
4. 向比色皿加入200µL终止剂B,混匀,待测;
5. 启动荧光检测仪,与手机APP链接;根据荧光探针不同,设置相应的激发波长和发射接收波长;
6. 将比色皿放入检测仪,在手机APP上读取数据,保存;
7.酶活性抑制率计算公式:抑制率(%)=[(A0–A1)/A0]·100
式中,A0为空白(无农药)相对荧光强度,A1为测试组(含农药)相对荧光强度。
实施例4:本申请中荧光探针式-1与NDRO-1两种荧光探针底物对AChE酶活性对比
按照实施例2操作方法,检测体系中无农药加标,只改换探针底物的种类和浓度,其他检测条件相同。
本申请中探针式-1与NDRO-1相比,对AChE酶结合能力和催化活性等动力学常数都有较大的提高。反应后的探针式-1的相对荧光强度是NDRO-1的2.5倍,显示了更高的灵敏性。探针式-1的结构和性能特点,能充分发挥特异性检测敌敌畏农残方法的优势。
实施例5:不同农药检测限比较
按照实施例2操作方法,检测体系中不同浓度加标敌敌畏、甲胺磷、呋喃丹,探针底物为式-1,其他检测条件相同。
在PBS(100mM,pH=7.4)加标农药0.1mg/L检测中,甲胺磷或呋喃丹对荧光强度减弱很少,敌敌畏对荧光强度减弱至仪器的最低检测限,显示在相同农药含量下敌敌畏比其他农药对荧光强度减弱100倍左右。
实施例6:敌敌畏检测标准曲线
根据标准曲线的测定方法,得到抑制率(%)与敌敌畏浓度之间的标准曲线为y=12.955x+14.893,R2=0.9945,x为敌敌畏的浓度;敌敌畏在PBS缓冲液中的检测范围为0.1~6.0µg/L;再根据检测方法的总稀释倍数200,换算得到果蔬样品的检测范围为0.02~1.2mg/kg。该检测范围可以满足国标对果蔬中敌敌畏的限量要求(国家标准GB/T2763-2019,食品安全国家标准-食品中农药最大残留限量,敌敌畏:0.1~0.5mg/kg)。
实施例7:混合农药加标的影响
在PBS(100mM,pH=7.4)中加标,敌敌畏、敌敌畏+甲胺磷、敌敌畏+呋喃丹、敌敌畏+甲胺磷+呋喃丹,再用PBS(100mM,pH=7.4)稀释100倍后,按实施例3检测,根据抑制率计算结果再乘以总稀释倍数100。
通过以上实验可以看出,甲胺磷、呋喃丹等农药含量对该探针检测敌敌畏的含量影响较小,该方法可以专用于敌敌畏含量的检测。
实施例8:敌敌畏农残回收率测试
将敌敌畏的丙酮溶液,按0.10mg/kg量,喷洒在0.30g果蔬上,晾干后,按照实施例2萃取,萃取液再用PBS(100mM,pH=7.4)稀释100倍,最后按照实施例3检测,根据抑制率计算结果再乘以总稀释倍数200。
本发明的检测方法,对果蔬中敌敌畏农残回收率达到行业70~110%标准。
Claims (6)
2.根据权利要求 1 所述的荧光探针在敌敌畏农残检测中的应用,其特征在于:该探针作为AChE 的水解底物,可利用其水解反应活性,通过定量检测水解产物的生成量来测定AChE 的活性。
3.根据权利要求 2 所述的荧光探针在敌敌畏农残检测中的应用,其特征在于:所述酶源为从鸭血提取的乙酰胆碱酯酶单酶。
4.根据权利要求2 所述的荧光探针在敌敌畏农残检测中的应用,其特征在于:该探针用于检测被敌敌畏农残抑制后的酶活性,间接地定量体系中的敌敌畏含量。
5.根据权利要求4所述的的荧光探针在敌敌畏农残检测中的应用,其特征在于:所述间接地定量体系中敌敌畏含量的方法,包括以下步骤:
S1.将萃取的溶液稀释100倍,使待测溶液中农药的含量为0.1~6 μg/L;
S2.向稀释后的萃取溶液中,加入酶剂,在恒温混匀仪37 oC下,预孵反应 7 min;
S3.取预孵溶液加入比色皿,再加入含荧光探针的DMSO溶液,在恒温混匀仪37 oC下,震荡反应;向比色皿加入终止剂,混匀,得到待测溶液;
S4.启动荧光检测仪;将比色皿放入检测仪,在手机APP上读取数据,保存;
S5.酶活性抑制率计算公式:抑制率(%) = [(A0 – A1)/A0]·100
式中, A0为无农药的空白相对荧光强度,A1为含农药的测试组相对荧光强度;
S6.根据相对荧光强度计算抑制率,再根据抑制率计算出萃取液中敌敌畏的含量;
S7.根据测得的萃取液中敌敌畏的含量乘上稀释倍数200,得到果蔬样品中敌敌畏的含量。
6.根据权利要求 5 所述的荧光探针在敌敌畏农残检测中的应用,其特征在于:该探针底物本身没有荧光,而其水解产物具有荧光属性,采用荧光快速检测仪实现产物及底物的快速灵敏检测;所述荧光检测条件为:激发波长 465 nm,在 550~560 nm 进行荧光发射谱的检测。
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