高效液相色谱法同时测定保健食品中红景天苷和腺苷

目的 建立同时测定保健食品中的红景天苷和腺苷含量的高效液相色谱测定方法.方法 采用50％甲醇为溶剂,超声提取样品中的的红景天苷和腺苷成分.采用shim-pack CLS-ODS色谱柱(150 mm ×4.6 mm,5μm),流动相为甲醇+ 20 mmol/L磷酸二氢钾水溶液(15 +85,V/V),流速1.0 ml/min,进样量10 μl,紫外检测波长为红景天苷275 nm,腺苷260 nm.结果 红景天苷在10.0 ～200 μg/ml范围内线性良好(r=0.999 5),平均回收率92.5％～99.5％,精密度2.8％～4.7％(n=6);腺苷在2.50～50.0μg/ml范围内线性良好(r=0.999 6),平均回收率90.0％～ 94.0％,精密度2.1％～5.2％(n=6).红景天苷和腺苷检出限LOD分别为0.01和0.005μ g/g.结论 本方法快捷、简便、灵敏度高,可准确同时测定保健食品中的红景天苷和腺苷含量.     

保健食品中盐酸氨基葡萄糖与硫酸软骨素的含量测定

正目的:建立氨糖软骨素类保健食品中盐酸氨基葡萄糖与硫酸软骨素含量测定的方法。方法:采用高效液相色谱法测定氨糖软骨素类保健食品中盐酸氨基葡萄糖与硫酸软骨素的含量。结果:硫酸软骨素浓度在13.01~260.2μg/mL范围内呈良好的线性关系,盐酸氨基葡萄糖浓度在15.05~301.0μg/mL内呈良好的线性关系。结论:本方法简单、灵敏、快速、准确,可以用于氨糖类保健食品中盐酸氨基葡萄糖和硫酸软骨素的测定。     

测定参类保健食品中总皂苷的新方法

目的 建立参类保健食品人参总皂苷比色测定新方法.方法 采用大孔吸附树脂纯化样品,人参皂苷Re为标准品,通过蒽酮与人参皂苷分子中的糖基反应进行比色法测定.结果人参皂苷5～200 μg/ml范围内呈线性关系,y=0.369+0.994x,相关系数r=0.999 5,回收率90.7％～104.2％,相对标准差3.50％～6.42％.结论 该方法简便、快速、准确,能满足参类保健食品中总皂苷的测定.     

高效液相色谱-蒸发光法测定保健品中盐酸氨基葡萄糖的含量

目的建立高效液相色谱-蒸发光法测定一种保健品中盐酸氨基葡萄糖含量的分析方法。方法采用Waters Xbridge Amide柱(4.6mm×150mm,3.5μm),以乙腈:0.2%三乙胺水(V:V,75:25)为流动相,流速为1.0 mL/min,柱温为40℃。蒸发光散射检测器检测条件为漂移管温度105℃,载气N_2,压力12.5 bar。结果盐酸氨基葡萄糖进样量在0.12886～1.03088μg时与峰面积呈良好线性关系(r~2=0.9998),平均加样回收率为101.91%,相对标准偏差为1.43%。结论此方法简单、准确,精密度和重现性良好,可用于保健品中盐酸氨基葡萄糖含量的测定。     

RP-HPLC法测定核桃外果皮中齐墩果酸的含量

建立核桃外果皮中齐墩果酸含量测定的反相高效液相色谱法(RP-HPLC),采用色谱柱为Intersil ODS(150 mm×4.6 mm,5μm);流动相为甲醇:水:冰乙酸(265:35:0.1,V/V);流速0.8 mL/min;进样量20 μL;检测波长为210 nm;柱温30℃.结果表明,齐墩果酸进样量在0.728～7.28 μg(r=0.999 7)范围内呈现良好的线性关系,齐墩果酸平均回收率(n=9)为101.1%,相对标准偏差(RSD)为2.44%.测得核桃外果皮中齐墩果酸含量为2.1 mg/100 g.该方法简便快速,结果可靠准确,重现性和稳定性好.     

邻苯二甲醛柱前衍生法测定食品中盐酸氨基葡萄糖的含量

目的：建立邻苯二甲醛(OPA)柱前衍生法测定食品中盐酸氨基葡萄糖含量的分析方法。方法：取样品加入约40 mL水，超声处理30 min，用水定容至50 mL，用0.45μm滤膜过滤，经SHIMAZDU ODS-SP(4.6 mm×150 mm,5μm)分离，以0.68%醋酸缓冲液:甲醇(80:20,v:v)为流动相等度洗脱，流速1.0 mL/min，柱温35℃，进样量5μL，二极管阵列检测器340 nm波长采集数据，外标法定量。结果：盐酸氨基葡萄糖在10～1000 mg/L浓度范围内线性良好，相关系数R2为0.9995,3个浓度水平的加标回收率在91.1%～95.60%，相对标准偏差(n=6)为0.84%～1.10%，精密度的相对标准偏差(n=6)为0.61%，方法检出限为0.0050 g/100 g，定量限为0.0125 g/100 g。结论：该方法操作简便、灵敏度高，具有良好的准确度和精密度，适用于食品中盐酸氨基葡萄糖含量的测定。     

钛胶RP-HPLC法测定食用油及其制品中的TBHQ、PG和BHT

建立了反相钛胶柱高效液相色谱法同时测定油脂及其制品中特丁基对苯二酚(TBHQ)、没食子酸丙酯(PG)和2,6-二叔丁基对甲酚(BHT)的方法.色谱条件:分离柱为Titania Sachtopore-RP柱(250 mm×4.6 mm i.d.,5μm);流动相采用1.0％的磷酸-甲醇-水梯度洗脱;流速为0.8 mL/min;检测波长为290 nm;TBHQ、PG的线性回归范围为0.5～50 μg/mL;BHT线性回归范围为0.5～ 100 μg/mL;TBHQ、PG和BHT的最低检出限分别为0.2、0.1和2.0 μg/mL;样品的加标回收率范围为91.61％ ～ 114.11％.该方法操作简单易行,方法精密度和准确度高,用于食用油及其制品中TBHQ、PG和BHT的同时测定,取得满意结果.     

保健食品中邻苯二甲酸二异辛酯快速筛查的 定性定量分析方法

目的 建立保健食品中邻苯二甲酸二异辛酯(diisooctyl phthalate, DEHP)快速筛查的定性定量分析方法。方法 样品经无水乙醇超声提取后, 采用气相色谱-质谱联用法在选择离子扫描模式下进行定量检测。结果 DEHP在0.01070~10.70 μg/mL 范围内具有良好的线性关系, 相关系数为0.9987, 该方法检出限(LOD)为0.02 μg/g, 定量限(LOQ)为0.07 μg/g。加标回收率为73.8%~96.8%; 结论 该法简便、快速、准确, 溶剂用量少, 可用于保健食品中DEHP的检测。     

高效液相色谱法测定保健食品中虫草素和腺苷的含量

样品中的虫草素和腺苷用纯水经80℃水浴提取,采用 CALESIL ODS-100C_(18)柱(5 μm,4.6 × 250mm),在流动相为10mmol/LKH_2PO_4缓冲液(pH=6.0):甲醇=85:15的色谱条件下分离,紫外260nm 下检测。虫草素和腺苷的线性范围分别为1.05 μg/ml～10.5 μg/ml 和10.3 μg/ml～103 μg/ml,加标回收率分别为95.8%和96.5%,相对标准偏差分别为0.10%和1.8%,检测限均为0.05 μg/ml(以进样浓度计)。该方法简便、快速、结果准确、可靠,能应用于保健食品中虫草素和腺昔含量的测定。     

反相高效液相色谱法测定油类保健食品中 混合生育酚

目的建立测定油类保健食品中混合生育酚的反相高效液相色谱法。方法样品经氢氧化钾甲醇溶液皂化,盐酸甲醇溶液中和;用反相高效液相色谱:色谱柱(SUPELCO,C18,4.6 mm×150 mm,5μm);流速:1.0 m L/min;柱温:40℃;进样量:20μL;波长:294 nm;流动相:水和甲醇,梯度洗脱;将α-、γ-及δ-生育酚分离;外标法定量。结果本方法标准曲线在0.01~0.20 mg/m L范围内有良好的线性关系,r0.9990,回收率为93.5%~103.8%,RSD4.0%,检出限为0.02μg/kg,定量限为0.1μg/kg。结论该方法结果准确可靠,节省样品前处理时间及试剂,有利于降低检验成本,适用于油类保健食品中混合生育酚含量的测定。     

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.     

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