双柱固相萃取-高效液相色谱法测定大米中氨基甲酸酯农药残留量的研究

本文研究了用高效液相色谱-紫外检测器方法同时检测大米中八种氨基甲酸酯类农药(杀线威、灭多威、涕灭威、抗芽威、残杀威、苯恶威、西维因、仲丁威)的残留量。本文对多种氨基甲酸酯农药的提取、净化方法、色谱分离条件、线性关系、回收率和重现性进行了研究，并对方法进行了验证，研究结果表明用丙酮作为提取剂，用florisil和C18固相萃取净化柱双柱净化样品，简化了净化操作，且提高了检测灵敏度。采用Spherisorb C8色谱柱，流动相用乙腈：水(33．5：66．5)，八种氨基甲酸酯类农药得到完全分离。八种氨基甲酸酯类农药的平均回收率分别为杀线威80．9％-89．5％，灭多威82．9％-91．6％，涕灭威82．6-91．2％，抗芽威81．2％-86．7％，残杀威82．3％-93．9％，苯恶威84．7％-94．4％，西维因82．4％-90．0％，仲丁威83．1％-91．0％。变异系数(Cv％)均在3．97以下，检测低限分别为：杀线威0．005，灭多威0．01，涕灭威0．005，抗芽威0．005，残杀威0．0025，苯恶威0．0025，西维因0．005，仲丁威O．01。方法的检测低限、回收率和精密度均满足残留分析要求。     

食品中曲酸的色谱分析

建立了食品中曲酸(KA)的离子对高效液相色谱法。采用0．01mol／L磷酸氢二钠-甲醇(95：5，V／V)为流动相，添加1．0mmol／L四丁基溴化胺(TBA)，检测波长226nm，样品用40％甲醇超声提取，曲酸在Nova．PakC18柱上获得了良好分离。该方法的检出限为0．032mg／L，回收率为95．7％～103．2％，相对标准偏差为1．16％-2．01％。结果表明，方法的检出限为0．032mg／L，回收率为95．7％～103．2％，相对标准偏差为1．16％-2．01％。该法准确、快速、简便，应用于食品中曲酸的测定，结果满意。     

反相高效液相色谱法测定食品中EDTA的含量

此法是将样品均质后用水稀释提取，在提取液中加入硫酸铜和抗坏血酸，经过20-24小时络合二价铜离子反应，在254nm波长处进行反相液相色谱测定。检出限为10．0mg／kg。方法测定蛋黄酱的回收率为87．0-94．2％，其RSD为1．6-2．5％；罐头食品的回收率为89．3-97．8％，其RSD为2．2-2．8％；饮料的回收率为94．6-99．9％，其RSD为1．3-1．9％，酱菜食品的回收率为89．6-98．7％；其RSD为2．2-2．8％。本方法具有适用范围广、灵敏高、简便、快速、易操作的特点，是测定食品中EDTA添加量的理想方法。     

纸浆增白,调色实验初探

本实验在不改变胶印书刊纸生产工艺现状的前提下，对硫酸盐苇浆、硫酸盐马尾松浆、马尾松磨石磨木浆三者之混合浆进行了增白、调包实验探讨，以期提高胶印书刊纸的白度。1主要原料及实验方法网前箱浆：取自本公司1号纸机网前箱，浆中含化学苇浆50．5％，化学木浆24．5％，漂白机械浆25％，松香0．15％～025％，明矾3％～4％，滑石粉12％～16％。混合浆：取自本公司1号纸机混合箱，浆中含化学苇浆50．5％，化学木浆24．5％，漂白机械浆25％，松香0．15％～0．25％。增白剂：荧光增白剂VBL。染料：碱性紫、品蓝。实验方法：网前箱浆加荧光增…     

大豆中磺酰脲类除草剂残留量的检测

为检测大豆中除草剂的残留量，建立了RP-HPLC和HPLC-MS选择离子监测（SIR）同时检测大豆中10种磺酰脲类除草剂残留量的方法。试样经乙腈提取，正己烷液-液分配，弗罗里硅土填充柱净化，然后采用RP-HPLC-DAD和HPLC-ESI（＋）-MS测定。对HPLC和LC／MS分离条件、试样前处理条件进行了研究和优化。建立的方法简便、快速、灵敏。10种磺酰脲类除草剂HPLC法测定，在0．1-10．01μ/ml范围内线性相关系数为0．9996—0．9997，在0．05—2．00mg／kg浓度范围之间，加标回收率均在69．8％-100．7％，其多次测定的RSD在1．9％-10．4％之间，最低检出限均为20μg／kg。LC-MS法测定在0．025—1．0μg／ml范围内线性相关系数为0．9995—0．9998，在0．02-0．1mg／kg浓度范围之间，加标回收率均在72．1％-98．8％，其多次测定的RSD在0．9％-7．7％之间，最低检出限均低于10μg／kg。本方法可满足进、出口大豆中多种除草剂残留量同时检验的工作需要。     

气相色谱法测定熟食中"霉克星"的含量

研究了用气相色谱法测定熟食中“霉克星”（Dimethyl Fumarate，DMF）含量的方法。探讨了样品测定过程中有关条件的变化对测定的影响，得到了测定的适宜条件。该方法的回收率在86．03％～95．58％之间，在0．010～500．0μg／mL标准曲线的回归方程为Y=348.96x＋845.95，相关系数r=0．9997，RSD小于1．30％（n=10）。本方法操作简单、快速、准确，灵敏度高，重现性好，可用于熟食中“霉克星”的日常检测及应用推产。     

冷蒸气发生-原子吸收光谱法测定纺织品中可萃取痕量镉

本文建立了以酸性人工汗液提取，冷蒸气发生-原子吸收光谱法测定纺织品中可萃取痕量镉的方法。研究了载气流速、还原剂的选择、增敏剂加入量、介质酸度以及共存离子的干扰等因素。在试验选定的最佳条件下，镉浓度在0．05μg／L～40．0μg／L呈良好线性关系，相关系数≥0．9993，方法检出限为0．020μg／L，样品加标回收率为90．8％～106．1％，相对标准偏差小于3．8％。该方法灵敏度高、操作简单、干扰小，用于纺织品中可萃取痕量镉测定，结果满意。     

辣椒及其制品中苏丹红1号的HPLC-MS/MS检测方法

为快速检测食品中的苏丹红1号，建立了一种快速准确的苏丹红1号液质联用测定方法。样品用乙腈提取，稀释定容后用液相色谱-质谱联用法测定，对HPLC-MS／MS的测定条件进行了研究和优化。回收率在90．5％～110．0％之间，多次测定的RSD在1．3％～7．2％之间，该方法的最低检出限低于10pg。该方法简便、快速、准确、灵敏，可以满足食品中苏丹红1号检测的需要。     

顶空气相色谱法测定三氯蔗糖中有机溶剂残留量

建立了三氯蔗糖中有机溶剂残留量的顶空气相色谱分析方法。采用大口径HP-快速GC残留溶剂柱为分离柱，FID为检测器，外标法进行定量。并对顶空平衡温度、平衡时间对残留有机溶剂测定的影响进行了分析研究。结果表明：甲醇在1．58mg／L-158．30mg／L乙醇在7．98mg／L～798、00mg／L内有良好的线性关系，相关系数分别为0.9997、0．9996；方法精套度试验RSD（n=6）分别为2．14％、1．83％；加标平均回收率（n=5）甲醇为99、72％、RSD=2．05％，乙醇为97．21％、RSD=2．51％；最低检测限分别为0．3mg，L、0．08mg，L。本方法快速、灵敏、准确、无污染。     

食用油中TBHQ的快速检澳

采用甲醇提取食用油脂中的抗氧化剂TBHQ，用乙腈一水淋洗的反相高效色谱一荧光光谱法测定其中的TBHQ的含量，方法最低检测限为0．05μg／g，标准线性范围在0．01～10．0mg／L之间，回收率在97．5％-108．0％之间，相对标准偏差为1．6％～5．1％。该方法简便、快速，稳定可靠。     

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.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

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.     

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