鲤鱼中恩诺/环丙沙星残留量的酶联免疫检测

应用酶联免疫分析方法定量测定鲤鱼中恩诺/环丙沙星残留量.测试曲线线性范围为10～810mg/kg,最低检测限为10μg/kg.向样品中分别添加20、100、500μg/kg三个浓度水平的恩诺沙星,平均回收率分别为80%、80.9%和76.6%.     

鸡蛋中环丙沙星、恩诺沙星残留物HPLC-MS/MS分析

目的建立鸡蛋中环丙沙星、恩诺沙星残留物液相色谱-串联质谱(LC-MS/MS)检测方法。方法鸡蛋中环丙沙星、恩诺沙星用酸性乙腈提取,正己烷除脂,采用Waters ACQUITY UPLC?BEH C18色谱柱(2.1mm×100mm,1.7μm)分离,电喷雾离子源在正离子模式下电离,多反应监测(MRM)模式扫描。结果环丙沙星和恩诺沙星分别在5.194～129.85 ng/ml和2.154～53.85 ng/ml范围内线性关系良好,线性方程分别为Y=1300X+17.7(r=0.9999)、Y=1450X-658(r=0.9993)。环丙沙星和恩诺沙星定量限(S/N=10)分别为1.0388μg/kg和0.4308μg/kg。分别添加环丙沙星含量为1.0388,2.597μg/kg,恩诺沙星含量为0.4308,1.077μg/kg的对照品溶液于阴性鸡蛋基质中,回收率分别90.7%～107.6%、80.1%～101.6%和85.0%～105.4%、86.9%～103.6%。结论该方法简单、灵敏、准确,可以作为鸡蛋中环丙沙星、恩诺沙星的检测方法之一。     

QuEChERS-高效液相色谱-荧光法检测鸡蛋中环丙沙星、达氟沙星、恩诺沙星和沙拉沙星的残留量

目的 建立QuEChERS前处理结合高效液相色谱-荧光检测器(high performance liquid chromatography-fluorescence detector, HPLC-FLD)同时检测鸡蛋中环丙沙星、达氟沙星、恩诺沙星和沙拉沙星残留量的方法。方法 鸡蛋样品添加4.0 g硫酸钠和1.0 g氯化钠, 再加入8 mL 1%甲酸乙腈进行提取, 离心后上清液再加入到Agilent dSPE净化管中, 经浓缩后采用HPLC-FLD进行检测, 0.05 mol/L磷酸三乙胺溶液(pH 2.4)-乙腈为流动相, 检测波长: 激发波长280 nm, 发射波长450 nm, 采用外标法定量。结果 环丙沙星、恩诺沙星和沙拉沙星的线性范围为2~100 μg/L, 相关系数均大于0.9999, 达氟沙星的线性范围为0.4~20 μg/L, 相关系数大于0.9999。环丙沙星、恩诺沙星、沙拉沙星的最低定量限为2 μg/kg, 达氟沙星的最低定量限为 0.4 μg/kg。环丙沙星、恩诺沙星、沙拉沙星在2~10 μg/kg的浓度添加水平上, 回收率为70.2%~91.8%, 达氟沙星在0.4~2 μg/kg的浓度添加水平上, 回收率为70.5%~96.3%, 批内、批间的相对标准偏差分别为3.89%~9.20%、5.29%~12.3%。结论 该方法简便、快速、准确、灵敏度高, 适用于鸡蛋中环丙沙星、达氟沙星、恩诺沙星和沙拉沙星残留量的检测。     

超临界流体萃取和高效液相色谱同时测定鸡肉中4种氟喹诺酮类药物残留

建立了一种超临界流体萃取(SFE)-高效液相色谱(HPLC)同时检测鸡肉中4种氟喹诺酮类药物(FQs)的方法。SFE萃取的适宜条件是温度80℃,系统压力为300kg/cm2,总流速为3mL/min,萃取时间为30min,夹带剂甲醇的比率为30%。萃取样品用高效液相色谱荧光检测器(激发光波长290nm,发色光波长455nm)外标法定量。氧氟沙星、诺氟沙星、环丙沙星和恩诺沙星在2.5～50μg/L浓度范围内线性良好,相关系数为0.9876～0.9996,其最低检出限为10～25μg/kg。在25～250μg/kg浓度范围内,平均加标回收率为56.6%～94.2%,相对标准偏差在1.4%～14.1%范围。     

磁性微球表面光引发聚合制备金属配位印迹层及选择性富集奶样中氟喹诺酮类药物残留

目的发展一种金属配位印迹磁性微球的制备方法,并用于奶样中氟喹诺酮类药物残留的选择性富集。方法采用简便的溶剂热法合成磁性纳米粒子,再采用溶胶-凝胶法制备磁性硅胶微球,然后在磁性硅胶微球表面接枝光引发剂,在125 W紫外灯辐射下合成恩诺沙星-Co(Ⅱ)配位印迹层,并用于磁分散萃取奶样中恩诺沙星、环丙沙星和洛美沙星。结果该方法的加标回收率为89.6%~100.8%,相对标准偏差为1.4%~5.5%,其中环丙沙星的检出限和定量限分别为1.72μg/kg和5.74μg/kg,洛美沙星的检出限和定量限分别为2.05μg/kg和6.82μg/kg,恩诺沙星的检出限和定量限分别为1.18μg/kg和3.94μg/kg。结论该样品处理方法是一种选择性好、简单快速的分离检测奶样中氟喹诺酮类药物残留的方法。     

肉制品中喹诺酮残留检测

喹诺酮类药物是具有4-喹诺酮基本结构并且由人工合成的抗生素类药物,是一种人畜共用药,食用含有喹诺酮残留的食品会对人体造成危害。本实验参照GB/T 21312-2007,采用液相色谱-质谱/质谱法对羊肉中6种喹诺酮类药物的残留量进行检测。检测结果显示,环丙沙星、氧氟沙星、培氟沙星、诺氟沙星、恩诺沙星、洛美沙星检出限分别为0.06μg/kg、0.02μg/kg、0.07μg/kg、0.05μg/kg、0.06μg/kg、0.05μg/kg;回收率为84.1%～102.1%,各物质的精密度依次是10.5%、7.4%、8.5%、6.8%、6.9%、7.2%;空白对照值为零;本次实验所采集的12种羊肉样品均未检出环丙沙星、氧氟沙星、培氟沙星、诺氟沙星、恩诺沙星、洛美沙星这6种抗生素类药物,符合农业部标准。     

恩诺沙星时间分辨荧光免疫分析方法的建立

目的：采用时间分辨荧光免疫分析(time-resolved fluoroimmunoassay,TRFIA)技术建立高灵敏的恩诺沙星(enrofloxacin,ENR)快速检测方法。方法：以包被抗原(ENR-OVA)包被微孔板,与游离的恩诺沙星共同竞争抗恩诺沙星抗体,以铕(Eu3+)标记的羊抗兔抗体进行示踪。结果：方法的批内变异系数小于10%、批间变异系数小于15%,平均回收率为91.62%,灵敏度为5ng/L,可测范围为0.01～100μg/L,ED20、ED50和ED80分别为0.088、3.40μg/L和32.81μg/L。结论：ENR-TRFIA方法稳定性好、可测范围宽,具有很好的应用前景。     

环丙沙星时间分辨荧光免疫分析方法的建立与应用

建立基于时间分辨荧光免疫分析技术的环丙沙星(CPF)间接竞争检测方法。将环丙沙星-卵清白蛋白(CPF-OVA)包被于固相微孔板,CPF标准品或样品中CPF与CPF包被原(CPF-OVA)共同竞争限量的CPF抗体,用铕标羊抗兔IgG示踪,建立环丙沙星时间分辨荧光免疫分析方法(CPF-TRFIA);考察包被质量浓度、抗体稀释液、反应时间等对方法灵敏度的影响。结果表明：在优化条件下,该方法的检测限为0.5μg/L,半抑制质量浓度(IC50)为4.32μg/L,线性范围(IC20～IC80)为1.14～28.85μg/L;该方法对蜂蜜中CPF平均回收率为80.66%～100.30%,对牛奶中CPF的平均回收率为76.30%～95.22%,两者的平均批内和批间变异系数分别为7.42%和10.92%。CPF-TRFIA间接竞争法测定环丙沙星具有灵敏度高、特异性好、性能稳定的优点,适于高通量筛查。     

微波辅助萃取-液相色谱-串联质谱法检测猪肉中四种氟喹诺酮类药物残留

建立了微波辅助萃取-液相色谱-串联质谱法检测猪肉中氧氟沙星、诺氟沙星、环丙沙星、恩诺沙星四种氟喹诺酮类药物残留的方法。样品经微波辅助萃取,正己烷脱脂,无水硫酸钠除水,浓缩提取物至干,用1.0mL0.1%甲酸溶液溶解后上机检测。采用Hypersil GOLD-1.9μm,50 mm×2.1 mm(i.d)色谱柱分离,在多反应监测模式下检测,外标法定量。结果表明:四种氟喹诺酮类药物在浓度10～200μg/L范围内线性关系良好,相关系数r=0.9956～0.9991,定量限为10μg/kg。在不同添加水平下,其平均回收率为88%～101%,变异系数为1.4%～4.1%。     

固相萃取-高效液相色谱-荧光检测法同时测定动物源性食品中8种氟喹诺酮类药物残留

建立动物源性食品中8种氟喹诺酮类药物(麻保沙星,诺氟沙星、环丙沙星、达氟沙星、恩诺沙星,二氟沙星,噁喹酸,氟甲喹)残留的高效液相色谱检测法。方法 样品用EDTA-Mcllvaine缓冲溶液提取,PEP-2固相萃取柱净化,ZORBAX C₁₈(4.6 mm×250 mm,5 μm)分离,荧光检测器检测,外标法定量。结果 麻保沙星,噁喹酸,氟甲喹配制标准品浓度在30～360 μg/L,其余5种在15～180 μg/L范围内线性关系良好,相关系数均>0.99,诺氟沙星,环丙沙星,恩诺沙星,二氟沙星的检出限为2 μg/kg,达氟沙星的检出限为0.5 μg/kg,麻保沙星,噁喹酸,氟甲喹的检出限为8 μg/kg,各种组分回收率在77.6%～98.3%之间,相对标准偏差为2.8%～9.4%。结论 该方法操作简单,准确度和精密度高,对人体危害较小,能够满足不同基质检测的需要。     

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.     

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.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.