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1.
目的建立动物源性食品中7种抗病毒类药物残留的液相色谱-串联质谱测定方法。方法动物源性食品中的抗病毒类药物经甲醇-1%三氯乙酸(1:1,V:V)提取,通过固相萃取柱净化、浓缩后,在正离子模式下用液相色谱-串联质谱法检测。结果 7种抗病毒类药物检测限为0.3~1.5μg/kg,定量限为1.0~5.0μg/kg。在0.1~100μg/kg浓度范围内线性关系良好,相关系数r0.99。在1.0、5.0、10.0μg/kg三个浓度添加水平下,该方法的平均回收率为87.2%~121.4%,相对标准偏差为0.6%~8.4%(n=6)。结论本方法专属性强、准确性好、灵敏度高,适用于动物源性食品中抗病毒类药物残留的检测。  相似文献   

2.
建立动物源食品(鸡蛋、鸡肉、鸡肝)中氟虫腈及其4种代谢产物(氟甲腈、氟虫腈砜、氟虫腈硫醚、酰胺氟虫腈)残留量的气相色谱-负化学源-串联质谱(gas chromatography-negative chemical ionization-tandem mass spectrometry,GC-NCI-MS/MS)测定方法。样品经乙腈(正己烷饱和)提取后,采用改进的QuEChERS净化和GC-NCI-MS/MS的多反应监测模式检测,基质匹配工作曲线法定量。实验结果表明,氟虫腈及其4种代谢产物在1~100μg/L质量浓度范围内线性良好,线性系数均大于0.999 0,氟甲腈、氟虫腈和氟虫腈硫醚定量限(RSN≥10)为0.5μg/kg,氟虫腈砜和酰胺氟虫腈定量限为1.0μg/kg。在2.0、10.0、20.0μg/kg加标水平下,回收率在80.2%~108.7%之间,相对标准偏差为3.8%~10.2%。该方法灵敏度高、准确性好,能够满足动物源食品中氟虫腈及其4种代谢产物残留量的测定。  相似文献   

3.
目的 建立一种高效液相色谱-串联质谱法(high performance liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)快速检测动物源性食品中克伦特罗残留量。方法 样品经β-葡萄糖醛甘酶酶解,乙腈提取,经过ProElut QuEChERS净化管净化。采用0.1%甲酸(A)和乙腈(B)作为流动相进行梯度洗脱,用多反应监测模式(multiple reaction monitoring, MRM)对克伦特罗含量进行检测。结果 该方法可以在15 min内完成目标物的分离分析。克伦特罗在0.5、1、5μg/kg添加水平的回收率为90.0%~94.3%,相对标准偏差小于10%(n=6),方法检出限为0.5μg/kg。结论 该方法快速、准确、灵敏,适合用于动物源性食品中克伦特罗的残留量的测定。  相似文献   

4.
研究建立了动物源性食品中喹乙醇的高效液相色谱-串联质谱仪的残留检测方法,动物源性基质前处理采用乙腈∶乙酸乙酯(1∶1)微波超声提取两遍后浓缩,用正己烷净化,再经ZORBAXSB-C18液相色谱柱分离,0.1%甲酸水+乙腈梯度洗脱,采用高效液相色谱-串联质谱仪(带有ESI源正模式)MRM检测模式,内标法测定。方法检出限为0.5μg/kg,在0.5μg/kg~50μg/kg范围内线性相关系数r为0.9984,相对标准偏差RSD为1.9%~6.6%,回收率为93%~98%。实验前处理过程简单易行,提取率高,净化效果好,检出限低,线性相关性良好,具有较好重复性和较高回收率,定性定量准确。  相似文献   

5.
目的建立超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)测定动物源性食品(鸡肉、鸡肝、鸡蛋和牛奶)中金刚烷胺的分析方法。方法样品用0.2%(V:V)甲酸乙腈溶液提取,经Oasis PRiME HLB小柱净化后用Capcell Pak C18 MGIII-H色谱柱分离,以甲醇和0.1%甲酸水溶液(V:V)作为流动相进行梯度洗脱,在多反应监测(multiple reaction monitoring,MRM)模式下进行液相色谱-串联质谱法测定,基质匹配标准溶液外标法定量。结果金刚烷胺在1.0~50.0μg/L范围内线性关系良好(r~2=0.9994)。在添加水平为1.0,5.0和20.0μg/kg时的回收率为76.3%~93.5%,相对标准偏差(relative standard deviation,RSD)在3.4%~8.6%之间,方法的检测限(limit of detection,LOD)为0.2μg/kg,定量限(limit of quantification,LOQ)为1.0μg/kg。结论该法简便、灵敏、准确,适合于动物源性食品中金刚烷胺的快速分析测定。  相似文献   

6.
目的建立高效液相色谱-串联质谱法测定几种动物源食品中氯霉素残留的方法。方法对《动物源食品中氯霉素残留量的测定高效液相色谱-串联质谱法》(农业部第781号公告)中的测定方法进行优化,样品经提取后经HLB固相萃取小柱净化,采用甲醇-水进行梯度洗脱,经Agilent Eclipse-plus C18色谱柱(3.0 mm×100 mm,1.8μm)分离,采用多反应检测负离子模式进行定性及定量分析。结果在0.5~10.0 ng/mL范围内,氯霉素的浓度和色谱峰面积线性关系良好(r=0.9998),方法检出限为0.03μg/kg,定量限为0.1μg/kg,在1.0、2.0和5.0 ng/mL 3个水平的加标回收率为91.58%~109.52%,相对标准偏差小于7.5%。结论该方法快速、准确、灵敏,能满足几种动物源食品中氯霉素残留的测定。  相似文献   

7.
建立起组织研磨-QuEChERS-高效液相色谱-串联质谱法测定动物源食品中磺胺类药物残留的分析检测方法。样品用EDTA缓冲液溶解后,通过组织研磨仪高速处理样品,以乙腈提取目标化合物,经Bond QuEChERS提取、QuEChERS EMR-Lipid 净化,使用三重四极杆液质联用仪进行分析。C18色谱柱分离,0.1%甲酸-乙腈梯度洗脱,外标法定量。结果表明,10种磺胺在一定浓度范围内线性关系良好,决定系数(R2)均大于0.99,目标化合物检出限(S/N=3)为0.2 μg/kg,定量限(S/N=10)为0.5 μg/kg。方法平均回收率为89.4%~111.0%,相对标准偏差(n=6)为0.8%~4.9%,该方法操作简单,回收率高,适用于动物源食品中磺胺类药物残留的测定。低质量浓度的磺胺类药物在猪肉、牛奶、鸡蛋中均存在明显基质效应,采用基质匹配标准曲线校正法可以对基质效应产生的影响进行补偿与消除。  相似文献   

8.
本文建立QuEChERS-UPLC-MS/MS测定动物源性食品中五氯酚及其钠盐残留量的分析方法。样品用酸化乙腈提取,QuEChERS方法净化。用甲醇和5 mmol/L乙酸铵水溶液作为流动相进行梯度洗脱,C18色谱柱分离。在超高效液相色谱-串联质谱电喷雾电离动态多反应监测负离子模式下定量分析。五氯酚在0.5~15.0 ng/mL线性范围内的相关系数为0.999 96,方法检测限为0.1μg/kg。当不同基质中的标准添加量为1.0~4.0μg/kg时,平均回收率为74.7%~101.4%。本方法操作简单、快速高效,对相关检验检测工作提供参考。  相似文献   

9.
建立了一种快速准确定性定量检测动物源性食品中喹乙醇代谢物3-甲基-喹喔啉-2-羧酸(MQCA)残留量的液相色谱—串联质谱(LC-MS/MS)检测方法。样品组织通过碱水解提取MQCA,阴离子固相萃取柱净化,LCMS/MS检测,内标法定量。结果显示,在0.5~50.0ng/mL浓度范围内,MQCA线性关系良好,相关系数R2为0.999 7。MQCA检出限为0.1μg/kg,方法在0.1,0.2,1.0μg/kg的添加水平下,回收率为95.6%~108.2%,相对标准偏差为3.4%~14.3%(n=6)。该检测方法准确、快速、灵敏度高,适用于动物源食品中MQCA残留量的检测和确证。  相似文献   

10.
目的 建立高效液相色谱–电喷雾电离串联四级杆质谱测定动物源性食品中甲硝唑(MNZ)、地美硝唑(DMZ)、洛硝哒唑(RNZ)3种硝基咪唑类化合物及2种代谢物羟基甲硝唑MNZOH(甲硝唑代谢物)、1-甲基-5-硝基-2-羟甲基咪唑HMMNI(地美硝唑代谢物)残留量的检测方法。方法 样品采用乙酸乙酯提取, 甲醇和正己烷分配除脂, 再经HLB固相萃取柱净化, 采用高效液相色谱–串联质谱法在选择离子监测(MRM)正离子模式(ESI+)下检测。结果 该方法在0.1~100.0 μg/L范围内具有良好的线性关系, 相关系数r >0.99。在添加水平为0.1、0.5、10.0 μg/kg时, 方法的回收率在61.1 %~108.0 %之间, 相对标准偏差为1.9 %~6.3 % ; 定量下限(S/N=10)为0.1 μg/kg。结论 该方法适合动物源性食品中硝基咪唑类药物及其代谢物残留量的检测。  相似文献   

11.
Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.  相似文献   

12.
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.  相似文献   

13.
The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.  相似文献   

14.
The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.  相似文献   

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16.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

17.
Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH3CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH2PO4-20.6 mM Na2B4O7 buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.  相似文献   

18.
An investigation is described in which various polyfunctional compounds were applied to wool in attempts to stabilize the temporary improvements in wrinkle-recovery brought about by ‘annealing’. Several reactive systems involving formaldehyde were found to produce the desired permanently improved wrinkle-recovery.  相似文献   

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This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.  相似文献   

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