LC-MS/MS测定黄鱼中碱性嫩黄O及酸性橙Ⅱ

建立高效液相色谱-串联四极杆质谱正负离子切换模式同时快速测定黄鱼中黄色工业染料碱性嫩黄O及酸性橙Ⅱ的检测方法。样品匀质后,经乙腈提取,盐析,-20℃冷冻脱脂,低温离心后,取乙腈层采用高效液相色谱-串联质谱法分离、测定。结果表明碱性嫩黄O在0.5μg/kg~10μg/kg、酸性橙Ⅱ在5μg/kg~100μg/kg范围内呈良好的线性关系,高中低浓度回收率在70%~110%,相对标准偏差(n=5)小于15%,碱性嫩黄O、酸性橙Ⅱ检出限分别为0.5、5μg/kg。本方法适用于黄鱼中违禁工业染料碱性嫩黄O及酸性橙Ⅱ的测定。     

超高效液相色谱串联质谱法测定全蛋粉中的双酚A和双酚S

建立超高效液相色谱-串联质谱测定全蛋粉中双酚A和双酚S的检测方法。全蛋粉经水复溶后经乙腈提取,提取液使用分散系固相萃取-基质增强脂质去除产品进行除脂,使用Oasis PRiME HLB小柱进一步净化,使用超高效液相串联质谱测定,负离子多反应监测(MRM)模式测定,内标法定量。结果显示:双酚A在1~50 μg/kg范围内呈线性,相关系数为0.9991,加标回收率为98.8%~105.0%,日内和日间相对标准偏差分别为3.84%~8.58%和5.65%~8.74%,检出限为0.3 μg/kg,定量限为1.0 μg/kg;双酚S在0.4~20 μg/kg范围内呈线性,相关系数为0.9995,加标回收率为98.5%~102.5%,日内和日间相对标准偏差分别为3.01%~7.86%和3.18%~7.03%,检出限为0.1 μg/kg,定量限为0.3 μg/kg。实际样品测定结果分别为:双酚A 2.4~3.8 μg/kg;双酚S 0.48~0.82 μg/kg。本方法前处理简单、高灵敏度适用于全蛋粉中双酚A和双酚S的日常测定。     

QuEChERS-超高效液相色谱-串联质谱法快速测定豆制品中二甲基黄和碱性嫩黄O的含量

目的建立QuEChERS结合超高效液相色谱-串联质谱法(QuEChERS-ultra performance liquid chromatography-tandem mass spectrometry,QuEChERS-UPLC-MS/MS)快速测定豆制品中二甲基黄和碱性嫩黄O的含量。方法豆制品经20 m L乙腈-水(1:1,V:V)浸泡,采用QuEChERS方法进行萃取、净化,经Shim-pack XR-ODSⅢ色谱柱分离,正离子扫描,多反应监测模式进行质谱分析,外标法定量。结果二甲基黄在添加水平为0.5、1和10μg/kg时,方法回收率为81.6%~97.2%;碱性嫩黄O在添加水平为6、10和50μg/kg时,方法回收率为89.1%~100.7%;二甲基黄和碱性嫩黄O的相对标准偏差均小于12%(n=6);二甲基黄和碱性嫩黄O的检出限分别为0.5、2μg/kg;定量限分别为1.5、6μg/kg。结论该方法操作简便、快速准确,适用于豆制品中二甲基黄、碱性嫩黄O的快速筛查和定量分析。     

UPLC-MS/MS结合新型固相萃取技术快速确证猪肉中17种β-受体阻断剂

目的 建立新型固相萃取技术结合超高效液相色谱串联质谱测定猪肉中17种β-受体阻断剂的测定方法。方法 猪肉样品经酶解,乙腈沉淀蛋白并萃取后,经Oasis PRiME HLB固相萃取柱通过式净化。以甲醇和0.1%甲酸水为流动相梯度洗脱,采用迪马Endeavorsil C18色谱柱分离,ESI源正离子模式进行多反应监测(MRM),内标法定量。结果 17种β-受体阻断剂的线性范围在0.2～20 μg/L,相关系数(r)＞0.999,检出限(LOD)为0.05～0.07 μg/kg,定量限(LOQ)为0.15～0.2 μg/kg。3个加标水平下(0.2、0.4、2 μg/kg)的回收率为84.97%～123.40%,RSD为0.41%～13.94%。结论 本方法灵敏、快速、准确,可用于猪肉中β-受体阻断剂的定性、定量检测。     

液相串联质谱法测定豆制品中的碱性橙Ⅱ和碱性嫩黄O

建立同时测定豆制品中的碱性橙Ⅱ和碱性嫩黄O的液相串联质谱法。以乙醇为溶剂,经超声提取、离心分离,利用Oasis HLB固相萃取柱对样品进行净化,以0.1%甲酸水-0.1%甲酸甲醇溶液为流动相,LC-MS/MS测定碱性橙Ⅱ和碱性嫩黄O的含量。结果显示:在0～500 ng/mL内,碱性橙Ⅱ和碱性嫩黄O所得的回归方程均呈较好的线性关系,相关系数>0.995,检出限为碱性橙Ⅱ0.5μg/kg,碱性嫩黄O 0.8μg/kg。该方法的平均回收率为87.2%～94.5%,RSD为1.65%～4.08%。     

超高效液相色谱-高分辨质谱法测定糖果中的碱性嫩黄O

建立了用超高效液相色谱-高分辨质谱法(UPLC-ESI-Q-TOF)测定糖果中碱性嫩黄O的分析方法。样品通过超声提取后,采用Oasis HLB固相萃取柱进行净化,洗脱液氮吹浓缩后定容至1 m L,直接用UPLC-ESI-Q-TOF检测。该方法的标准曲线在相关浓度范围(0.4~20.0)ng/m L内呈良好的线性关系,线性相关系数为R~2=0.9997,碱性嫩黄O的检出限为0.2μg/kg,加标回收率在80.85%~104.42%之间,样品重复测定8次,能得到较好的精密度,其RSD均小于10%。实验结果表明,该方法灵敏度高、重复性好、定量准确,适合于糖果中碱性嫩黄O的准确测定。     

不同前处理方法对食品中罂粟壳检测效果对比

采用高效液相色谱-三重四极杆质谱联用法作为检测方法,通过对比QuEChERS法和固相萃取法(Oasis PRiME HLB和Oasis MCX)对不同食品基质火锅底料、辣椒粉和肉汤中5种生物碱检测效果的影响,优选食品中罂粟壳检测的普适性前处理方法。结果表明:5种生物碱中罂粟碱、那可丁、蒂巴因在0.2~10 μg/L,可待因、吗啡在1~50 μg/L的浓度范围内呈现出良好的线性关系,决定系数(R2)均大于0.9994;采用QuEChERS法和固相萃取法(Oasis PRiME HLB和Oasis MCX)分别对样品进行前处理后,测得的基质效应分别为0.12%~0.44%,0.02%~0.82%,0.07%~0.41%,检出限分别为0.1~5.0、0.1~8.0、0.1~5.0 μg/kg;回收率和相对标准偏差(RSDs)分别为70.6%~105.3%,64.2%~116.9%,73.6%~102.5%和2.0%~8.5%,1.6%~8.3%,1.6%~7.8%(n=6)。同时本研究对50批次市售火锅底料、辣椒粉、肉汤等样品进行检测,发现1批次石锅鸡汤含有那可丁、罂粟碱、蒂巴因和吗啡4种生物碱,所检出的生物碱成分与高效液相色谱-四极杆-飞行时间质谱仪的一级质谱匹配度良好。因此,固相萃取法(Oasis MCX)更适用于食品中罂粟壳检测的提取和净化,能够满足对不同基质食品中罂粟壳的定性、定量分析。     

动物肌肉、内脏和牛奶中咪唑脲苯残留量的高效液相色谱测定及液相色谱-串联质谱确证

目的建立固相萃取净化-高效液相色谱和液相色谱-串联质谱测定动物组织和牛奶中咪唑脲苯残留量的分析方法。方法残留的咪唑脲苯采用1%三氟乙酸-乙腈(1:4,v/v)提取,Oasis WCX固相萃取柱净化,高效液相色谱外标法定量,并经液相色谱-串联质谱确证。结果咪唑脲苯检出限为10μg/kg(S/N≥3),定量限为25μg/kg(S/N≥10);在LOQ、MRL和2MRL三个添加水平下重复分析6次,回收率为72.7%~101%,相对标准偏差为1.2%~6.9%。结论该方法稳定、可靠,适用于动物组织和牛奶中咪唑脲苯的测定。     

固相萃取-UPLC-MS/MS法测定牛奶中氟虫腈及其代谢物残留量

建立一种固相萃取-超高效液相色谱-串联质谱法同时测定牛奶中氟虫腈及其代谢物(氟甲腈、氟虫腈砜、氟虫腈硫醚)的分析方法。牛奶样品经提取和盐析,Oasis PRiME HLB固相萃取柱通过式净化后,以乙腈-水为流动相,HSS T3色谱柱(2.1mm×100 mm,1.8 μm)进行色谱分离,在电喷雾负离子模式下,多反应监测(MRM)方式进行测定,外标法定量。结果表明,氟虫腈及其代谢物在0.05~5.0 μg/L浓度范围内均呈良好的线性关系,相关系数r≥0.9976,方法检出限为0.01 μg/kg,定量限为0.05 μg/kg。在浓度分别为0.5、1、10 μg/kg加标水平下,4种化合物的回收率范围为80.6%~101%,相对标准偏差范围为1.0%~6.1%。该方法简单快捷、准确可靠,适用于牛奶中氟虫腈及其代谢物的同时测定。     

通过式固相萃取与液相色谱串联质谱和气相色谱串联质谱结合测定加热卷烟中多种农药残留

[目的]实现加热卷烟中多种农药残留的测定.[方法]样品经乙腈提取,以PRiME HLB通过式固相萃取柱净化后,分别以液相色谱-串联质谱(LC-MS/MS)和气相色谱-串联质谱(GC-MS/MS)分析.[结果]①PRiME HLB通过式固相萃取净化效率高,操作简便.②在高、中、低三个不同添加浓度水平下,所有分析物的回收率...     

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.