大豆磷脂中卵磷脂检测方法的研究

采用高效液相色谱法对大豆磷脂中的磷脂酰胆碱进行检测,详细介绍了样品的预处理、检测设备和检测条件。试验确定了最佳检测条件:流动相为正己烷-异丙醇-醋酸(1%,V/V)(8∶8∶1,V/V/V);色谱柱Lichroisorb Si-60(4.6mm×250mm×5μm);检测波长203nm;流速1mL/min;柱温30℃。     

高效液相色谱法测定火锅底料中辣椒素类物质

为了测定火锅底料中的辣味物质(辣椒素及二氢辣椒素),建立了高效液相色谱快速检测方法:色谱柱为C18InertSustain(4.6 mm×250 mm,5μm),流动相为甲醇和水(V/V,65∶35),流速1.0mL/min,柱温30℃,进样量10μL,检测波长280nm。辣椒素类物质的提取采用超声波辅助提取。结果表明:火锅底料中的辣椒素类物质含量在0.256~0.816g/kg之间,斯科维尔系数在3948~12583SHU。     

辣椒中辣椒素类物质的检测方法及稳定性研究

目的:通过对GB/T 21266-2007中辣椒素和二氢辣椒素检测的色谱条件的优化,使辣椒素和二氢辣椒素的测定更加快速,并考察辣椒素与二氢辣椒素贮存过程中的稳定性。方法:高效液相色谱法,色谱条件为C18色谱柱（4.6mm×250mm,5μm）,流动相为甲醇∶水（V∶V=70∶30）,流速为1mL/min,检测波长为280nm,进样量10μL,柱温30℃。结果 :与GB/T 21266-2007的色谱条件相比,检测时间缩短了约12min。提取出的辣椒素与二氢辣椒素在室温条件下贮存一个月,其含量没有发生剧烈波动。结论:此色谱条件能对辣椒素和二氢辣椒素进行有效检测,且能明显缩短两者的保留时间;提取出的辣椒素与二氢辣椒素室温条件下短时间内能保持稳定。      

高效液相色谱法测定叔丁基对苯二酚含量的方法学研究

建立了HPLC叔丁基对苯二酚含量的方法:色谱柱:Shim-pack Vp-ODS(150mm×4.6 mm,5μm)接Cl8保护柱(20mm×4.6mm,5μm);以乙腈∶水=32∶ 68(V/V,含1%乙酸)作为流动相;流速:0.8mL/min;检测波长:290nm;柱温:25℃.结果表明TBHQ浓度在2×10-4～1.0mg/mL范围内与峰面积线性关系良好r≥0.9999,最低检测限为4ng,并建立了回收率及日内和日见精密度实验.     

高效液相色谱法测定豆瓣中辣椒素类物质含量

豆瓣是以蚕豆和辣椒作为主要原料生产的一种调味品,是西南地区尤其是四川地区的一种传统发酵食品。为了测定豆瓣中的辣味物质(辣椒素及二氢辣椒素),建立了高效液相色谱快速检测方法:色谱柱为C18反相色谱柱(250mm×4.6mm,5μm),流动相为甲醇和水(V/V,75∶25),流速1.0mL/min,柱温30℃,进样量20μL,检测波长280nm。辣椒素类物质的提取采用超声波辅助提取。结果表明:豆瓣样品中辣椒素含量在0.0161～0.0624g/kg之间,二氢辣椒素的含量在0.0142～0.0357g/kg之间,斯科维尔指数在519～1671SHU之间。     

高效液相色谱-蒸发光散射检测器定量分析谷胱甘肽含量

为了快速定量检测溶液中的谷胱甘肽(GSH)含量,建立了应用C18反相柱,HPLC-ELSD测定GSH含量的方法,确定了高效液相色谱分离条件。色谱条件为:色谱柱(Kromasil C18,250×4.6mm,5μm);流动相:V(H2O)∶V(CH3CN)∶V(TFA)=96.2∶3.7∶0.1;柱温:室温;流速:1.0mL/min;进样量:20μL;漂移管温度90℃;氮气流速:1.5L/min;i mpactor on模式;增益(Gain):1。结果表明,在此条件下,GSH浓度的自然对数与峰面积的自然对数成很好的线性关系(R2=0.9995);精密度2.15%;最低检测限30.73mg/L;加标回收率99.78%。该方法快速、简便、准确,适合从复杂体系中快速检测谷胱甘肽的含量。     

高效液相色谱法-紫外检测器测定辣椒制品中辣椒素的含量

本文研究了用超声波法提取辣椒素,再采用高效液相色谱法测定。色谱条件为:色谱柱为AgilentZorbaxSB-C18(5μm,250mm×4.6mm),柱温30.0℃。UV检测器的波长:280nm。流动相V(甲醇):V(水)=80:20,流速0.8ml/min,进样量10μl。结果表明用超声波提取法简单、提取率高。     

HPLC法分析测定“黑美人”马铃薯中原花青素

建立高效液相色谱法分离测定"黑美人"马铃薯中原花青素含量的分析方法。实验采用C18柱(Phenomenex5μm;250 mm×4.6 mm);V(甲醇)∶V(0.5%冰醋酸水溶液)=30∶70为流动相;柱温:25℃;流速:1 m L/min;检测波长:287 nm。结果表明:原花青素在80μg/m L~200μg/m L浓度范围内有良好的线性关系,相关系数R=0.995 7,方法的精密度RSD为2.86%,平均回收率为100.1%,原花青素的平均含量为51.805 mg/g。本方法简便、快速、准确、可靠,可用于"黑美人"马铃薯中原花青素的含量的测定。     

高效液相色谱法测定辣椒制品中的辣椒素类物质

该研究采用了高效液相色谱法对辣椒制品中的辣椒素类物质进行检测,并对其提取条件和检测方法进行了研究。以乙醇∶水＝70∶30（V∶V）作为提取液,采用直接萃取法提取样品中的辣椒素和二氢辣椒素,以0.3%磷酸二氢钾溶液-乙腈（62:38,V:V）为流动相,检测波长230 nm,Macherey-Nagel Nucleosil120-5 C18色谱柱（4.6 mm×250 mm, 5 μm）分离。结果表明,辣椒素和二氢辣椒素在20～100 μg/mL质量浓度范围线性关系良好（R12 = 0.999 8,R22 = 0.999 9）,检出限为0.001 g/kg,加标回收率分别为93%～104%和86%～103%,相对标准偏差RSD＜5%。该方法操作简单、快速,具有良好的准确性和精密度,可有效排除香辛料物质的杂峰干扰,适合各类辣椒制品中辣椒素类物质的检测。     

高效液相色谱法测定贵州顶坛花椒中麻味成分羟基-β-山椒素的含量

为了对贵州顶坛花椒中的麻味成分进行定量测定,从贵州产顶坛花椒中分离得到麻味特征性成分羟基-β-山椒素,并建立高效液相色谱方法定量检测花椒中羟基-β-山素椒的含量。色谱柱:YMC-Pack ODS-A(6.0mm×150mm,5μm);流动相:乙腈∶水(V/V为45∶55);流速为0.7 mL/min,柱温为35℃,波长为254nm;线性范围为0.01~0.14μg,相关系数R2=0.9994,检测限为0.0002μg,回收率在97.92%~103.60%,相对标准偏差(RSD)2.0%。结果表明:贵州顶坛花椒中羟基-β-山椒素的含量较高,符合其"麻味重"的特点。     

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