RP-HPLC同时测定保健食品中维生素D_2和D_3的含量

建立反向高效液相色谱法(RP-HPLC)同时测定保健食品中维生素D_2和D_3的检验方法。片剂和硬胶囊剂采用超声提取,软胶囊采用皂化提取制备,Zorbak ODS色谱柱(4.6 mm×250 mm×5μm),以甲醇-乙腈(9∶1,V/V)为等度流动相,检测波长为264 nm,流速为1.0 m L/min,柱温35℃。结果表明,维生素D_2在0.07~7.14μg/m L质量浓度范围、维生素D_3在0.08~8.62μg/m L质量浓度范围内呈线性关系(r=0.999 5),维生素D_2和维生素D_3的回收率分别为83.49%~98.56%和83.71%~98.43%,定量限为0.45μg/100 g。经方法学验证符合相关标准。该方法简便快捷,准确度高,能满足含维生素D类保健食品的含量测定要求。     

高效液相色谱法测定保健食品中水飞蓟素的含量

目的建立高效液相色谱法(high performance liquid chromatography,HPLC)测定保健食品中水飞蓟素的含量。方法样品以甲醇为提取剂超声提取30 min,以甲醇-水(55:45,V:V)为流动相,流速为0.8 mL/min,采用色谱柱Agilent TC-C_(18)分离,在288 nm检测波长下经HPLC检测;同时对检测波长、流动相比例、提取剂和提取时间等条件进行优化。结果水飞蓟素浓度在8.152~203.8μg/mL范围内呈良好的线性关系,相关系数为0.9999,平均回收率为100.35%,RSD值为0.95%,方法检出限为11.6 ng/g。结论该方法快速准确,可适用于保健食品中水飞蓟素含量的测定。     

高效液相色谱法测定保健食品中抗坏血酸同分异构体含量

目的 建立一种同时分离和测定保健食品中抗坏血酸同分异构体含量的高效液相色谱法。方法 样品经20 g/L的偏磷酸溶液超声提取, 选用资生堂CAPCELL PAK C18 ADME亲水色谱柱(4.6 mm×250 mm, 5 μm)分离, 以2.3 g/L磷酸二氢铵水溶液(pH值2.0±0.1)为流动相, 等度洗脱, 流速1.0 mL/min, 检测波长 245 nm。结果 该方法能很好的分离L(+)-抗坏血酸和D(-)-抗坏血酸, 2种抗坏血酸在1.0~50.0 μg/mL范围呈现良好的线性关系, 加标回收率分别为99.69%和100.34%, 检出限均为0.05 μg/mL。结论 该方法简单、快速、准确, 适用于保健食品中抗坏血酸同分异构体含量的测定。     

高效液相色谱荧光法测定营养素补充制剂中维生素K2(MK-7)的含量

建立高效液相色谱荧光法（HPLC-FLD）测定营养素补充制剂中维生素K2（MK-7）的含量。样品用异丙醇超声提取30 min，提取液离心过滤后取样液10 μL注入液相色谱系统中。样液经安捷伦C18色谱柱(4.6 mm×150 mm，5 μm)或其他等效色谱柱分离，柱后采用锌粉还原柱（4.6 mm×50 mm）衍生，使样品中维生素K2（MK-7）具有荧光特性。以甲醇（含5%四氢呋喃，冰乙酸0.03%，乙酸锌1.0 g/L）为流动相，流速1.0 mL/min，检测波长 激发波长243 nm发射波长430 nm。当称取样品1.0 g，定容体积为10 mL时，MK-7的检出限为0.03 μg/g，定量限为0.1 μg/g；MK-7在浓度0~2.176 μg/mL的范围内线性关系良好，线性相关系数为R2=0.9999；重复性实验中RSD%为0.97%；样品加标回收率为93.40%。此方法操作简单，高效，准确，重现性好，可用于营养素补充制剂中维生素K2（MK-7）的含量测定。     

高效液相色谱-串联质谱法检测保健食品中25种非甾体类抗炎药

目的 建立高效液相色谱-串联质谱法(high performance liquid chromatography-tandem mass spectrometry, HPLC-MS/MS)分析保健食品中25种非法添加非甾体类抗炎药的分析方法。方法 保健食品固体试样经甲醇超声提取, 液体试样经水-甲醇萃取来提取, 经液相色谱柱分离后, 在多反应监测(multiple reaction monitoring, MRM)模式下测进行25种非甾体类抗炎药含量的测定, 外标法定量。结果 25种非甾体抗炎药在1~500 ng/mL范围内呈现良好线性关系, 相关系数均大于0.99, 方法检出限为1.5~2.0 μg/kg, 定量限为5.0~6.0 μg/kg, 6.0、12.0和60.0 μg/kg 3个水平平均加标回收率为80.0%~108.2%, 相对标准偏差为6.4%~9.9% (n=6)。结论 该方法针对保健食品基质, 对固体和液体样品分别采取超声萃取和液液直接萃取的提取方式, 操作简便、节约成本、专属性强且灵敏度、回收率高, 满足保健食品中非甾体类抗炎药的检测。     

高效液相色谱法检测婴幼儿配方食品中维生素B12的含量

目的 建立一种高效液相色谱快速检测婴幼儿配方食品中维生素B12的方法。方法 选择C18柱（250×4.6mm,4.6 μm）作为色谱柱,流动相为水-甲醇（75:25）,流速0.5 mL/min等度洗脱,进样量35 μL,柱温40℃,波长361nm,样品经超声提取15 min,然后在8000 r/min下冷冻离心10 min,离心结束后取上清液过0.22 μm滤膜,上机测试。结果 显示维生素B12标准品在浓度0.05~2.0 μg/mL范围内线性良好;相关系数r=0.9998;平均回收率91.3 %;检出限2 ng/mL。结论 该条件下的高效液相色谱可测定婴幼儿配方食品中维生素B12含量,具有重复性好、简单、快速、结果准确等优点。因此该方法可应用于婴幼儿配方食品中维生素B12含量的检测。     

高效液相色谱法快速测定保健食品中原花青素的含量

建立高效液相色谱法快速测定保健食品中原花青素含量的方法。样品用甲醇超声提取,将试样溶液和正丁醇:盐酸(95:5,v/v)以及硫酸铁铵溶液置于20 mL顶空瓶中,在100℃烘箱中反应40min后,以甲醇-0.3%磷酸(27:73,v/v)为流动相,经C18色谱柱分离,在525 nm波长处,对保健食品中原花青素含量进行测定。结果表明,该方法在(0.01～0.2)mg/mL范围内线性关系良好,相关系数为0.998,样品的加标回收率为93.4%～98.7%,相对标准偏差小于2%。该方法操作简便、准确可靠、精密度较高,适合于保健食品中原花青素的快速测定。     

HPLC-MS/MS法测定酸枣汁中VC含量

建立HPLC-MS/MS法检测酸枣汁中维生素C的含量。该方法应用超声提取和Agilent G6410B Triple Quad LC/MS检测。Waters YMCTMODS-AQ S-5 120A(2.0×100 mm)分析柱,流动相为甲醇-水(0.1%甲酸)=50∶50;流速0.3 mL/min;柱温30℃,进样量为20μL。以液相色谱分离、电喷雾离子化串联质谱进行检测。VC在50 ng/mL~800 ng/mL范围内线性关系良好,酸枣汁中VC平均加标回收率为98.61%。该方法快速简便、精密度好、灵敏度高,可用于酸枣汁中VC的含量测定。     

液相色谱-串联质谱法测定保健食品中非法添加的18种镇静催眠类药物

目的建立液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry, UPLC-MS/MS)测定保健食品中非法添加的18种镇静催眠类药物的分析方法。方法样品经甲醇超声提取,采用C18(2.1mm×50 mm, 1.8μm)色谱柱, 0.1%甲酸水溶液-甲醇为流动相,梯度洗脱,流速0.3 mL/min;质谱检测器为ESI源(正离子)多反应监测模式进行定性、定量检测。结果 18种被测组分在5～100 ng/mL浓度范围内线性关系良好,相关系数均大于0.999。5、20、50ng/mL3种添加浓度的平均回收率在77.6%～98.5%之间,相对标准偏差为1.1%～5.5%。方法学检出限均低于0.2μg/g。结论该方法专属性强、灵敏度高、操作简便、测定快速,可用于保健食品中非法添加的18种镇静催眠类药物的质量监控。     

高效液相色谱-荧光检测法测定保健食品中维生素K2的含量

目的建立高效液相色谱-荧光检测法快速检测保健食品中维生素K_2(四烯甲萘醌)的分析方法。方法样品使用GIST C_(18)色谱柱(250 mm×4.6 mm,5μm)分离,柱后经锌粉还原柱(4.6 mm×50 mm,50～70μm)衍生,以甲醇(含有四氢呋喃10%、冰醋酸0.03%、氯化锌1.5 g/L、无水乙酸钠0.5 g/L)为流动相,流速为1.0 mL/min,进入荧光检测器进行检测。结果四烯甲萘醌保留时间约为10 min,在浓度0.1099～2.197μg/mL范围内线性关系良好,相关系数r~2=0.9999。重复性实验RSD为0.794%,3个浓度级别的加标回收率在97.1%～101.9%之间。当取样量为1.5 g,总定容体积为500mL时,四烯甲萘醌的检出限为71μg/100 g,定量限为236μg/100 g。结论该方法准确性高、重现性好、操作简单,可用于保健食品中维生素K_2的含量测定。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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