高效液相色谱法测定保健食品中的羟基酪醇

目的建立高效液相色谱法测定保健食品中羟基酪醇的方法。方法样品用二甲基亚砜进行超声提取后,采用Waters Spherisorb ODS2色谱柱(250 mm×4.6 mm, 5μm)进行分离,以0.12%甲酸水溶液-0.12%甲酸甲醇溶液为流动相等度洗脱,柱温为30℃,流速1 mL/min,紫外检测器进行检测,外标法定量。结果羟基酪醇在12.45～498.0μg/mL范围内线性关系良好,相关系数大于0.999;检出限为0.03g/100g;定量限为0.12 g/100 g;平均回收率为99.5%～100.6%,相对标准偏差值为0.55%～1.13%。结论该方法简便、快捷、高效、准确,适用于保健食品中羟基酪醇的测定。     

不同秋果型树莓中槲皮素和山奈酚含量的测定

通过高效液相色谱法测定,不同秋果型树莓中槲皮素和山奈酚的含量。高效液相色谱法的测定条件:色谱柱为安捷伦18反相色谱柱(250 mm×4.6 mm,5μm),甲醇-1%乙酸溶液为流动相,流速为1.000 mL/min,测定波长254 nm,进样量10μL。结果表明:槲皮素和山奈酚分别在0.11μg/mL～11μg/mL(R~2=0.999 8);0.11μg/mL～27.5μg/mL(R~2=0.999 7)呈良好的线性关系;加样回收率分别为为0.76%、0.91%。     

固相萃取-反相高效液相色谱法测定汤料中的碱性橙Ⅱ

建立一种快速、高效测定汤料中碱性橙Ⅱ的固相萃取-反相高效液相色谱(SPE-RP-HPLC)方法。用酸化甲醇溶液提取样品,上清液加入到HLB固相萃取小柱后,选择甲酸-水溶液淋洗,氨化甲醇洗脱,过0.22μm滤膜后上机检测。采用Waters RP C_(18)色谱柱(4.6mm×250mm,5μm)分离,以甲醇-乙酸铵(20mmol/L)水溶液作为流动相,用二极管阵列检测器检测,外标法峰面积定量。结果表明,碱性橙Ⅱ在1.0μg/m L~25.0μg/m L浓度范围内线性良好,相关系数r~2为0.9992,检出限为0.04μg/m L,定量限为0.12μg/m L,加标回收率达到89.2%~91.5%。该方法具有前处理简单、净化效果好、灵敏度高和检测速度快的优点,适用于汤料中碱性橙Ⅱ的分离和定量检测。     

高效液相色谱-串联质谱法测定保健食品中 黄曲霉毒素M1

目的建立测定保健食品中黄曲霉毒素M1的高效液相色谱-串联质谱法。方法样品经甲醇超声提取,用氰基柱将黄曲霉毒素M1分离,用高效液相色谱-串联质谱进行测定,外标法定量。结果黄曲霉毒素M1标准曲线在0.1~2.0 ng/m L范围内有良好的线性关系,r0.9998,回收率为77.5%~97.8%,RSD5.0%,检出限为0.1μg/kg。结论该方法结果准确可靠,可节省样品前处理时间,有利于降低检验成本,适用于保健食品中黄曲霉毒素M1的限量测定。     

高效液相色谱法测定保健食品中三氯蔗糖的含量

目的建立一种保健食品中三氯蔗糖含量测定的高效液相色谱检测法。方法样品采用Rad pak C18色谱柱(4.6 mm×250 mm,5μm)进行分离,以1.0 m L/min乙腈:水(V:V=15:85)为流动相,最后用高效液相色谱法(HPLC)-示差折光仪为检测器进行测定,外标法定量分析。结果高效液相色谱法在0.482~2.892 mg/m L浓度范围,三氯蔗糖的浓度和峰面积的线性良好,相关系数为0.999(r0.99),该方法的检出限和定量限分别为19.58 mg/g和65.27 mg/g,在不同的添加水平下,该方法的回收率范围为95.0%~95.6%,相对标准偏差为0.3%(n=9)。结论高效液相色谱法灵敏度、准确度均较高,适用于保健食品中三氯蔗糖的含量测定。     

高效液相色谱法同时测定鸡尾酒中7种合成色素

建立高效液相色谱同时测定鸡尾酒中7种人工合成色素(柠檬黄、胭脂红、苋菜红、亮蓝、诱惑红、日落黄、赤藓红)的方法。方法:利用ZORBAX Eclipse XDB-C18(4.6 mm×150 mm×5μm)反相色谱柱,流动相为0.02 mol/L乙酸铵-甲醇梯度洗脱,流速0.8 m L/min,柱温35℃,进样量10μL。该方法检出限为0.05~0.1μg/m L,在1.0~50μg/m L范围内线性良好,相关系数R2均大于0.999 88回收率为96.7%~103.3%,RSD为0.61%~1.65%。     

变波长高效液相色谱法同时测定葡萄酒中7种人工合成色素及防腐剂

建立了葡萄酒中7人工合成色素和防腐剂的高效液相色谱测定方法。方法采用ZORBAX Eclipse XDB-C18(4.6mm×250mm×5μm)反相色谱柱,流动相为20mmo L/L乙酸铵-甲醇(梯度洗脱),流速1.0m L/min,柱温30℃,进样量20μL。该方法的检出限0.2mg/L,线性范围0.40-50μg/m L,加标回收率98.9-104.1%,相对标准偏差为1.03-2.00%(n=4)。     

高效液相色谱—串联质谱法快速测定保健食品中4种降血糖类药物

目的:建立高效液相色谱—串联质谱法快速测定保健食品中4种降血糖类药物(恩格列净、利格列汀、沙格列汀、阿格列汀)的方法。方法:样品经甲醇超声提取,用反相高效液相色谱分离,在多反应监测模式下测定,外标法定量。结果:沙格列汀和阿格列汀在2~100μg/L内线性关系良好,定量限为0.10 mg/kg;在0.1,0.2,1.0 mg/kg加标水平下,回收率为79.2%~113.0%,相对标准偏差为0.9%~8.4%;恩格列净和利格列汀在20~500μg/L内线性关系良好,定量限为1.00 mg/kg;在1.0,2.0,10.0 mg/kg加标水平下,回收率为77.5%~111.1%,相对标准偏差为2.5%~9.4%。结论:该方法简便、快速、准确,可用于保健食品中4种降血糖类药物的确证与定量测定。     

猕猴桃中甲基硫菌灵和异菌脲HPLC测定方法研究

建立高效液相色谱法(High Performance Liquid Chromatography,HPLC)同时测定猕猴桃中甲基硫菌灵和异菌脲两种农药的含量。猕猴桃样品用乙腈涡旋提取,采用反相高效液相色谱法测定,色谱柱为Diamonsil C_(18)柱(250 mm×4.6 mm,5μm),柱温为30℃,进样体积20μL,流速1.0 mL/min,检测波长210 nm,流动相为乙腈-0.05%甲酸水溶液=(60∶40),采用等度洗脱模式。结果表明,甲基硫菌灵和异菌脲分别在0.204μg/m L~10.2μg/mL和0.210μg/m L~10.5μg/mL范围内线性关系良好,方法的专属性和准确度良好,能够用于检测猕猴桃样品中上述两种农药的残留。     

凝胶渗透色谱-高效液相色谱法测定植物油中苯并芘

建立了用凝胶渗透色谱-高效液相色谱法测定植物油中苯并芘的方法。该方法以乙酸乙酯-环己烷(1:1,v/v)提取样品,凝胶渗透色谱净化,以ZORBAXSB-C18柱(4.6mm×250mm,5μm)分离,流动相为甲醇和水(90+10),流速1.0mL/min,激发波长365nm,发射波长412nm,柱温25℃,进样量25μL。该方法的检出限0.4μg/kg,线性范围0.1~10.0μg/L,加标回收率98.7%~109.2%,相对标准偏差为3.81%~8.76%。     

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