超高效液相色谱-串联质谱法测定水中甲拌磷及其代谢物残留量

目的建立超高效液相色谱-串联质谱法测定水中甲拌磷及其代谢物残留量。方法样品经二氯甲烷提取净化后,采用液相色谱-串联质谱法测定,外标法定量。结果甲拌磷、甲拌磷砜、甲拌磷亚砜在质量浓度2~100 ng/mL范围内线性关系良好(r≥0.9996),检出限为2 ng/L,定量限为5 ng/L。在5、10、50 ng/L加标水平下,加标回收率为73.2%~85.9%,相对标准偏差为1.5%-6.2%。结论本方法适用于检测水中甲拌磷及其代谢物残留量,为水产养殖水中甲拌磷及其代谢物污染源排查及生态环境评价提供可靠的检测技术手段。     

固相萃取-高效液相色谱法测定猪肉与鸡肉中替米考星、泰乐菌素残留量

建立了高效液相色谱法(HPLC)测定猪肉与鸡肉中替米考星、泰乐菌素残留量的检测方法.样品用乙腈提取,C18固相萃取小柱净化,采用高效液相色谱分离,二极管阵列检测器(PDA)检测,外标法定量.结果表明:标准校准曲线在30～1000μg/L的范围内呈良好线性关系,相关系数r＞0.999.样品中替米考星、泰乐菌素的添加水平分别为0.05、0.10、0.15mg/kg时,样品加标回收率为72.7％～90.8％,变异系数在2.6％～8.3％之间,替米考星和泰乐菌素方法检出限30μg/kg,定量限为50μg/kg.本法简便、快速、定量准确、精密度高,适用于猪肉和鸡肉中替米考星与泰乐菌素残留量的检测.     

UPLC-MS/MS检测猪肉中3种大环内酯类药物残留量

建立了瘦猪肉中大环内酯类抗生素红霉素、替米考星、林可霉素的超高效液相色谱-串联质谱/质谱检测方法。猪肉样品经0.1%甲酸乙腈水(80∶20)溶液提取、Oasis PRi ME HLB固相萃取小柱通过式净化、反相液相色谱分离后进行质谱分析,在电喷雾正离子(ESI+)模式,多反应监测(MRM)下进行特征母、子离子对信号采集。根据保留时间和母离子及两个特征子离子信息进行定性分析,以基峰离子进行定量。结果表明:红霉素、替米考星、林可霉素在1.0~20μg/L浓度范围内线性关系良好,相关系数(r2)均大于0.99,空白样品加标回收率范围为73.6%~103.6%,相对标准偏差小于10.0%。红霉素、替米考星、林可霉素(目标化合物)方法检出限(LOD)为1.0μg/kg。该方法操作简便、准确、灵敏、重现性好、基质干扰少,适用于瘦猪肉中红霉素、替米考星、林可霉素的测定。     

LC-MS/MS测定肠衣中7种大环内酯类抗生素残留量

建立猪肠衣中螺旋霉素、替米考星、竹桃霉素、泰乐菌素、红霉素、罗红霉素、交沙霉素等7种大环内酯类抗生素残留量的液相色谱-串联质谱测定方法(LC/MS/MS).样品用甲醇提取,Oasis( HLB)固相萃取柱净化,液相色谱-串联质谱测定,外标峰面积法定量.方法的回收率范围为70.9 ％～98.4％;相对标准偏差5.8 ％～17.8％,7种大环内酯类抗生素的检出限均为20 μg/kg.     

高效液相色谱法测定猪肠衣中大环内酯类抗生素残留量的研究

建立高效液相色谱法检测猪肠衣中螺旋霉素、替米考星、泰乐菌素、交沙霉素等4种大环内酯类抗生素残留量的方法。试样中用乙腈提取,C18固相萃取柱净化,高效液相色谱测定,外标峰面积法定量。方法的回收率范围为70.2%～94.6%;室内相对标准偏差3.2%～8.9%,4种大环内酯类抗生素的检出限均为0.5 mg/kg。     

食品中黄曲霉毒素B_1的液相色谱-串联质谱测定法

建立了食品中黄曲霉毒素B1残留量的超高效液相色谱-串联质谱的检测方法。样品经乙腈+水(84+16)提取后,经多功能净化柱净化,超高效液相色谱-串联质谱法检测。本方法定量限为1μg/kg,线性范围为1~20 ng/mL;在黄曲霉毒素B1添加水平为1~10μg/kg时,在玉米样品中的回收率为95%~105%;在酱油样品中的回收率为96%~106%。     

高效液相色谱法和高效液相色谱-串联质谱法测定水产品中的四环素类残留量

目的 建立高效液相色谱法定量测定水产品中四环素类残留量,同时采用高效液相色谱-串联质谱法进行定性确证和定量检测。方法 具体优化了缓冲提取液浓度、固相萃取柱类型、色谱条件选择等测定环节。样品经柠檬酸缓冲液提取,固相萃取柱净化后,以液相色谱-紫外检测器进行定量检测,同时也可通过高效液相色谱-串联质谱仪进行定性和定量。结果 在10~200 ng/mL范围内线性良好(r>0.999),四环素类目标物在10、50、100 μg/kg 3个水平上进行加标回收试验,回收率为76.0%~94.5%,相对标准偏差为3.9%~7.4%,高效液相色谱法检出限为5 μg/kg,液相色谱-串联质谱法检出限为1 μg/kg。结论 该方法简便、稳定、准确,适合测定水产品中的四环素类残留量。     

超高效液相色谱-串联质谱法测定运动饮品中的叶酸

利用超高效液相色谱-串联质谱法建立了一种分析运动饮品中叶酸的方法。样品经10%乙醇提取后,采用T_3色谱柱(2.1 mm×150 mm,3μm)分离,以10.0%甲醇-0.1%甲酸为流动相,采用超高效液相色谱-串联质谱仪进行检测。结果表明叶酸组分在2.0~100.0 ng/m L浓度范围内线性良好,相关系数R~2为0.9992,检出限为1.0μg/kg,定量限为3.0μg/kg,加标回收率为91.9%~96.0%,相对标准偏差(RSD)为2.6%~3.2%。该方法具有前处理简单、灵敏度高和检测速度快的优点,适用于运动饮品中较宽浓度范围的叶酸含量的分析,为其测定提供参考。     

UPLC-MS-MS法检测辣椒及其制品和肉酱中的罗丹明B含量

建立了辣椒及其制品和肉酱中罗丹明B含量的超高效液相色谱-串联质谱联用检测方法。样品经乙腈提取后,经中性氧化铝固相萃取柱净化,超高效液相色谱-串联质谱法检测。本方法定量限0.1μg/kg,线性范围0.2~50 ng/mL;在罗丹明B添加水平0.1~10μg/kg时,辣椒片样品中的回收率76%~92%,辣椒制品中的回收率74%~93%,肉酱样品中的回收率70%~90%。     

超高效液相色谱-串联质谱法快速测定动物源性食品中的地塞米松残留量

目的 建立超高效液相色谱-串联质谱法快速测定动物源性食品中地塞米松残留量的分析方法。 方法 组织样品经碱水解, 乙酸乙酯提取, 旋近干, 正己烷除脂, 20%乙腈水定容, 以0.05%甲酸水-乙腈作为流动相, Poroshell 120 EC-C18(50 mm×2.1 mm, 2.7 μm)进行色谱分离, 超高效液相色谱-串联质谱多反应监测(multiple reaction monitoring, MRM)模式测定, 内标法定量。结果 猪肝、牛肉、鸡蛋、牛奶等4种基质中地塞米松在1~20 ng/mL范围内线性良好, 相关系数r2=0.9999, 最低定量限为0.2~1 μg/kg, 平均回收率为83.2%~108.2%, RSD为2.5%~6.5%。结论 该方法简便, 快捷, 回收率好, 精密度高, 灵敏度高, 适用于快速测定动物源性食品中地塞米松的残留量。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

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.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

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.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

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.     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

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.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

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.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the