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RP-HPLC同时检测苹果浓缩汁中主要危害性指标方法的建立
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摘要
随着苹果浓缩汁产业的发展,我国苹果浓缩汁所占比例日益增加,苹果汁出口贸易额逐年增长。然而,由于国际市场对食品安全的日益重视以及部分发达国家贸易保护主义的抬头,我国的农产品出口不断受到“绿色贸易壁垒”的困扰,苹果浓缩汁出口也不例外。
     根据来自海关和商检的信息,我国苹果浓缩汁出口出现退货的主要原因有:部分产品不同程度出现乳酸、富马酸、5-羟甲基糠醛、展青霉素以及农药残留超标。这些个别指标的超标对我国苹果浓缩汁以及其他农产品的国际出口声誉均带来了不利的影响。因此,加强果汁安全因子多残留同时检测刻不容缓。
     本研究在对苹果浓缩汁贸易中经常出现的超标指标进行系统研究的基础上,分别建立了RP-HPLC(reversed phase high-performance liquid chromatography,简称RP-HPLC)同时检测乳酸、富马酸、5-HMF和展青霉素;RP-HPLC同时检测乐果、多菌灵、5-HMF和展青霉素以及RP-HPLC同时检测11种不同类型农药的快速检测方法。以上检测方法的应用有利于保证我国苹果浓缩汁产品质量,使我国的苹果浓缩汁能顺畅进入国际市场。
     本论文主要从以下六个方面进行了研究,并获得了相应的结论。
     1.研究出5-HMF与展青霉素液.液萃取富集后再实现乳酸、富马酸适倍稀释的苹果浓缩汁样品预处理方法,为四组分的同时定量检测奠定了良好的基础。通过试验发现:本预处理方法对苹果浓缩汁中乳酸、富马酸、5-HMF以及展青霉素的回收率分别为95.65~99.91%、96.53~102.35%、89.96~101.33%、94.11~98.23%,CV<5%;方法的最低检出浓度为乳酸0.179mg·L~(-1)、富马酸3.217μg·L~(-1)、5-HMF5.672μg·L~(-1)和展青霉素8.90μg·L~(-1)。
     2.建立同时分离检测乳酸、富马酸、5-HMF和展青霉素的双通道色谱分析方法,实现了该四组分的在不同检测波长下的同时检测。经过对流动相的组成比例、流速、柱温以及pH等条件的摸索,确立了在柱温30℃、流速1.00mL·min~(-1)的条件下,以pH2.5的磷酸水配制含5%L腈的混合溶液最为流动相,210nm和276nm同时检测该四组分的最佳色谱条件。所建立的标准曲线方程最低定量限分别为:乳酸0.597mg·L~(-1)、富马酸10.723μg·L~(-1)、5-HMF18.907μg·L~(-1)以及展青霉素29.667μg·L~(-1)。10次进样的保留时间CV<0.5%。
     3.确定了同时检测5-HMF、展青霉素、乐果以及多菌灵的液-液萃取样品预处理方法。其流程是乙酸乙酯萃取-碱液净化-酸液强化。该方法对苹果浓缩汁中四组分的回收率分别为:乐果89.62~98.35%、多菌灵89.55~99.91%、5-HMF95.62~101.33%以及展青霉素85.65~95.72%。
     4.建立了同时分离检测乐果、多菌灵、5-HMF和展青霉素的双通道色谱分析方法,实现了该四组分的在不同检测波长下的同时检测。通过对流动相组成比例的研究,认为以甲醇:乙腈:水=1:1:8为流动相,流速0.8mL/min,柱温30℃进行210nm检测乐果和多菌灵同时在276nm检测5-HMF和展青霉素的色谱分离方法最为理想。各组分的最低定量限分别为:5-HMF0.04869mg·L~(-1)、展青霉素0.0207mg·L~(-1)、多菌灵0.5801mg·L~(-1)和乐果0.0922mg·L~(-1)。10次进样的保留时间CV<1%。
     5.研究出基于SPE-C_(18)同时富集苹果浓缩汁中11种农药组分的样品预处理方法。通过对净化液组成、净化液使用量、洗脱液使用量等因素的研究,实现了11种不同类型农药的同时富集。加标回收率测试结果表明:11种农药的加标回收率为86.27%~103.66%。
     6.建立了同时分离检测苹果浓缩汁中11种不同类型农药残留的色谱分析方法。通过对流动相组成比例以及流动方式的研究,建立了以乙腈:水=55:45的混合液为流动相的不等速洗脱方法,实现了苹果浓缩汁贸易中常见11种农药残留的同时分离检测,并建立了特定色谱条件下11种农药残留组分的标准曲线。各组分的最低检测限测试结果表明:该色谱分析方法可以满足国内外农药残留检测的要求。
With the development of the world's apple juice concentrate industry,the proportion of China's apple juice concentrate is increasing year by year and export trade is becoming biger and biger. However,due to peoples pay attention to the food security increasingly,as well as the "trade protectionism" increased in some developed countries,China's exports of agricultural products is falling into the "green barriers" trouble and the export of China's apple juice concentrate is limited too.
     According to the statistics from customs and institution of commodity inspection,the main reason of repercussion of Chinese apple juice concentrate exports is that some indicators such as lactic acid,fumaric acid,5-HMF,patulin and pesticide residues exceeded the standard.These occurrences impacted other agricultural exports as well as reputation of China's international exports.Therefore,it is necessary to put quality of the fruit juice into practice immediately.
     On the basis of study on the indicators exceeded standards of apple juice concentrate systematically,three RP-HPLC methods have been established:1) to determine lactic acid,fumaric acid,5-HMF and patulin simultaneously by RP-HPLC.2) to determine dimethoate,carbendazol, 5-HMF,patulin simultaneously by RP-HPLC.3) to determine 11 different types of pesticides simultaneously by RP-HPLC.The purpose of this study is to ensure China's apple juice concentrate product quality and safety,break through the technological barriers and make China's apple juice concentrate enter the international market smoothly.
     The study of this paper mainly focus on the following of six aspects and the corresponding conclusions were obtained.
     1.A new method of sample pretreatmentis has been developed,which can enrich 5-HMF and patulin by liquid-liquid extraction and can dilute lactic acid and fumaric acid properly.It makes a good foundation for the four components of the quantitative detection.The results shows that:lactic acid,fumaric acid,5-HMF and patulin recoveries were 95.65-99.91%,96.53-102.35%, 89.96-101.33%,94.11-98.23%respectively and CV<5%.The lowest detectable concentration of them are lactic acid 0.179mg·L~(-1),fumaric acid 3.217μg·L~(-1),5-HMF5.672μg·L~(-1) and patulin 8.90μg·L~(-1) for the method of sample pretreatment in apple juice concentrate respectively.
     2.A new chromatographic method has been developed that is based on technique of dual pathways to separate and detect four materials including lactic acid(210nm),fumaric acid(210nm), 5-HMF(276nm),patulin(276nm) simultaneously.After studied mobile phase's composition, proportion,flow rate,pH and temperature of chromatographic column,the best chromatographic condition has been established that is the mixture phosphoric acid solution(pH 2.5)-acetonitrile (95:5,v/v) as the mobile phase with a flow rate of 1.00 ml·min~(-1) at 30℃.Limit of quantitation of them are lactic acid 0.597mg·L~(-1),fumaric acid 10.723μg·L~(-1),5-HMF18.907μg·L~(-1) and patulin 29.667μg·L~(-1),CV of retention time for 10 vices<0.5%.
     3.A new method of sample pretreatment has been developed that could enrich 5-HMF,patulin, dimethoate and carbendazol through the path including acetoacetate extracting—lye purifying—acidizing fluid potentizing.The results show that:dimethoate,carbendazol,5-HMF and patulin recoveries were 89.62-98.35%,89.55-99.91%,95.62-101.33%,85.65-95.72%respectively.
     4.A new chromatographic method has been developed that is based on technique of dual pathways to separate and detect four componentes(dimethoate,carbendazol,5-HMF,patulin) simultaneously.After studied mobile phase's proportion,the best chromatographic condition has been established that is the mixture methanol-acetonitrile-water(1:1:8,v/v) as the mobile phase with a flow rate of 0.80 ml·min~(-1) at 30℃.In this condition,dimethoate and carbendazoi will be detected at 210nm while 5-HMF and patulin will be detected at 276nm.The standard curve of four components shows that limit of quantitation are 5-HMF 0.04869mg·L~(-1),patulin 0.0207mg·L~(-1),carbendazol 0.5801mg·L~(-1) and dimethoate 0.0207mg·L~(-1),CV of retention time for 10 vices<1%.
     5.Based on solid phase extraction,a new method(SPE-C_(18)) of sample pretreatment has been developed to enrich 11 kinds of pesticides,by studing the composition,dosis of purifying liquid and dosis of eluent.Test of recoveries shows that recoveries of 11 kinds of pesticides were between 86.27%and 103.66%.
     6.A new chromatographic method has been developed to separate and detect 11 kinds of pesticides simultaneously.After studied mobile phase's composition,proportion and mode of flow rate,the best chromatographic condition has been established that is the mixture water-acetonitrile (45:55,v/v) as the mobile phase with a changed flow rate at 30℃.Standard curve of 11 kinds of pesticides has been developed.Resultes of lowest detectable limit shows that this method could be fit for detection requirement of pesticide residue.
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