高效液相色谱-串联质谱法同时测定保健食品中淫羊藿苷、金丝桃苷、补骨脂素

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)测定保健食品中淫羊藿苷、金丝桃苷、补骨脂素的分析方法。方法样品经70%甲醇提取后,采用0.1%甲酸(A)和乙腈(B)作为流动相进行梯度洗脱,质谱离子源选用电喷雾离子(electron spray ionization,ESI+)源,采用多离子检测模式(multiple reaction monitoring,MRM)对定量离子和定性离子进行监测,在液相色谱-串联质谱仪上测定。结果在15 min内完成3种目标化合物的分离分析。3种功能成分在0.25、0.5和5 mg/kg添加水平的回收率为84.3%~95.0%,相对标准偏差为0.67%~2.11%(n=7),方法检出限分别为0.05、25、10μg/kg。结论该方法快速、准确、灵敏,适合保健食品中淫羊藿苷、金丝桃苷、补骨脂素的同时检测。     

超高效液相色谱-三重四级杆质谱法测定保健食品中六种功能成分

建立一种保健食品中黄芪甲苷、毛蕊异黄酮葡萄糖苷、甜菜碱、补骨脂素、异补骨脂素和淫羊藿苷的检测方法。样品经甲醇40℃超声提取60 min,采用水（A）和0.1%甲酸乙腈（B）作为流动相,利用超高效液相色谱-三重四极杆质谱联用仪,选用电喷雾离子（electron spray ionization,ESI+）源、正离子检测模式（positive mode,MRM）进行测定。结果表明,6种功能成分的回收率为85.7%～108.5%,该方法实验室内变异系数为0.91%～4.32%(n=7),方法检出限为0.02～0.60μg/kg。该方法准确、灵敏、高效,适合于中药类保健食品中特征成分黄芪甲苷、毛蕊异黄酮葡萄糖苷、甜菜碱、补骨脂素、异补骨脂素和淫羊藿苷的分析检测。     

高效液相色谱法测定免疫功能型保健食品中8种功效成分

目的 建立高效液相色谱法同时测定保健食品中8种功效成分（左旋肉碱、L-茶氨酸、天麻素、吡啶甲酸铬、咖啡因、淫羊藿苷、菊苣酸、10-羟基-α-癸烯酸（10-HAD））。方法 样品用70 %甲醇超声提取,采用C18色谱柱分离,以甲醇-磷酸二氢钾（0.1 %磷酸）水溶液为流动相,梯度洗脱,外标法定量。结果 左旋肉碱、L-茶氨酸在10.0 mg/L～150.0 mg/L,吡啶甲酸铬、天麻素、咖啡因和淫羊藿苷在1.5 mg/L～30.0 mg/L,菊苣酸在5.0 mg/L～100.0 mg/L, 10-HAD在2.5 mg/L～50.0 mg/L质量浓度与色谱峰面积有良好的线性关系,相关系数r ≥0.9990。方法检出限为1 mg/kg~10 mg/kg,回收率为94.7 %～108 %,相对标准偏差（RSDs）为0.7 %~6.8 %。结论 该方法快速,准确,灵敏,适合保健食品中8种增强免疫力功效成分的同时测定。     

液相色谱-串联质谱法测定普通食品基质中特征性药材表征成分

目的建立液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry,LC-MS/MS)同时测定补肾壮阳类食品及保健食品中9种补肾壮阳类功能成分的定性、定量的分析方法。方法优化前处理方法,分离条件和质谱参数。样品经70%甲醇超声提取,提取液经Agilent ZORBAX Eclipse XDB-C₁₈色谱柱(3.0mm×150mm,1.8μm)分离,流动相为乙腈和水(含有5mmol/L甲酸铵溶液),梯度洗脱,流速为0.5 mL/min,以电喷雾离子源正/负2种离子多反应监测模式进行MS/MS检测。其中补骨脂素、异补骨脂素、蛇床子素以正离子模式进行检测,淫羊藿苷、马钱苷、仙茅苷、柚皮苷、金丝桃苷、特女贞苷以负离子模式进行检测。结果选用压片糖果和配制酒为基质,马钱苷和金丝桃苷在20~4000ng/mL范围内、其余7种化合物在2~400ng/mL范围内线性关系良好,相关系数r≥0.999。金丝桃苷和马钱苷的定量限为0.5mg/kg,其余7种化合物的定量限均为0.05mg/kg。在2种基质中添加不同水平的标准溶液,加标回收率范围在67.0%~110.5%,RSD<10%。日内和日间精密度良好,RSD<10%。结论该方法能快速筛查食品及保健食品中的非药食同源补肾壮阳成分,并为监管收集数据和提供技术支撑。     

固相萃取UPLC-MS/MS测定黄酒中2-甲基咪唑和4-甲基咪唑

建立同位素内标超高效液相色谱串联质谱法同时测定黄酒中2-甲基咪唑和4-甲基咪唑的定量分析方法。样品加入同位素内标后,以质量分数1%的三氯乙酸提取,经MCX固相萃取柱净化,超高效液相色谱串联质谱分离并检测,内标法定量。在优化条件下,2-甲基咪唑和4-甲基咪唑的检出限分别为0.5μg/kg和0.05μg/kg,在0.1 ng/mL～1 000 ng/mL和1 ng/mL～1 000 ng/mL浓度范围内线性关系良好,相关系数大于0.999。     

超高效液相色谱—串联四极杆质谱法测定苦荞麦中黄酮类化合物

建立苦荞麦中芦丁、槲皮素和山萘酚含量的超高效液相色谱-串联四级杆质谱联用仪(UPLC-MS-MS)测定方法。试样用甲醇超声波提取,HSSC18超高效液相色谱柱、甲醇-水(0.1%甲酸)流动相分离,以电喷雾离子源负离子检测方式进行质谱分析,多反应监测(MRM)定量。结果表明,在0.1～100μg/mL范围内,芦丁、槲皮素、山萘酚浓度与峰面积均有良好的线性关系,相关系数r2均大于0.99。在低、中、高3个浓度添加水平下,三种物质的回收率均在94%以上,相对标准偏差在2.19～12.54范围内。芦丁检出限为0.01ng/mL,槲皮素、山萘酚检出限为0.1ng/mL。     

前列舒乐胶囊质量标准研究

目的建立控制前列舒乐胶囊质量的方法。方法用薄层色谱法定性鉴别制剂中的淫羊藿、黄芪、川牛膝;用高效液相色谱法（HPLC）测定淫羊藿苷含量。结果定性鉴定了制剂中的淫羊藿苷、黄芪甲苷及川牛膝;HPLC测定本品淫羊藿苷在0.37～7.47μg范围内线性关系良好,平均回收率98.9%,重现性试验RSD 2.2%。拟限定本品淫羊藿苷含量为每1 g不得少于8.0 mg。结论以上方法可有效地控制前列舒乐胶囊的质量。     

超高效液相色谱-串联质谱法快速测定保健食品中大豆异黄酮含量

建立保健食品中6种大豆异黄酮的超高效液相色谱串联质谱(UPLC-MS/MS)同时检测方法。样品中大豆异黄酮采用80%甲醇超声提取、Florisil固相萃取柱净化,C₁₈色谱柱分离,以0.1%甲酸水溶液和乙腈为流动相,流速0.3 mL/min,柱温30 ℃,质谱正离子多反应监测(MRM)模式进行检测。结果表明,大豆苷、大豆黄苷、染料木苷、大豆素、大豆黄素以及染料木素在各自浓度范围内线性关系良好;大豆黄苷、大豆黄素检出限均为10 μg/kg;大豆苷、染料木苷检出限均为20 μg/kg;大豆素、染料木素检出限均为30 μg/kg,加标回收率为81.8%~98.4%,相对标准偏差为1.8%~6.7%。所建立的超高效液相色谱串联质谱是一种高灵敏度、高准确度的测定方法,对保健食品中大豆异黄酮的质量控制提供了参考依据,具有一定的理论意义和应用价值。     

高效液相色谱-串联质谱法测定保健食品中的番茄红素

建立保健食品中番茄红素的液相色谱-串联质谱测定方法。样品经氢氧化钾溶液乙醇皂化,去除脂肪后用质量浓度为1g/100mL的2,6-二叔丁基-4-甲基苯酚(BHT)石油醚溶液提取,提取液经中性氧化铝固相萃取柱净化,采用液相色谱-质谱联用技术-大气压化学电离源多反应监测模式检测,外标法定量。方法的检出限和定量限分别为10μg/kg和100μg/kg,在50～5000μg/kg添加水平范围内,平均回收率为88.0%～103.1%,相对标准偏差低于15%。本方法灵敏,为保健食品中番茄红素的定量检测和确证提供了新的手段。     

超高效液相色谱-串联质谱法测定保健食品中90种那非类药物

建立高效液相色谱-串联质谱检测保健食品中90种那非类药物的分析方法。样品经甲醇直接提取,用Waters Acquity BEH C18柱(2.1 mm×100 mm,2.5μm)分离,以0.1%甲酸溶液和乙腈为流动相进行梯度洗脱,多反应模式监测,外标法定量。结果表明:90种那非类药物在0.2～50 ng/mL质量浓度范围内线性关系良好,相关系数大于0.995;检出限范围为2.5～25.0μg/kg;定量限范围为5.0～50.0μg/kg;加标水平为5.0～500μg/kg时,回收率范围为78.0%～109.9%;相对标准偏差小于10%;此方法简便快速、选择性强、灵敏度高,可用于保健食品中90种那非类药物的测定。     

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.     

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.     

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.     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Influence des ions sur le pouvoir hydratant de l'ure e: e tude sur peau de porc ex vivo

This study deals with the influence of ions (NaCl and MgSO4) in a W/O emulsion containing 10% urea. Moisturization kinetics are assessed by corneometry on pig skin ex vivo. The formula's influence on urea penetration is measured by infrared spectrometry with an ATR device and the stripping method. Corneometry and spectroscopy were chosen to record simultaneously the hydratation levels and urea localization into superficial cell layers. Urea crystallization after evaporation of emulsions and aqueous solutions is described. Results show that urea does not hydrate nor penetrate when applied to the skin through an aqueous gel. In a W/O emulsion, sodium chloride increases the ability of urea to moisturize without improving penetration. In vitro urea crystallization is disturbed by sodium chloride or magnesium sulphate for solutions and emulsions. This stabilization by ions is correlated with good moisturization values. The stabilization of urea in the solute state provided by ions increases its water epidermal binding capacity without enhancing penetration.     

Analysis on Economic Indicators from 62 Enterprises in Printing Machinery Industry in Q1 2014

Operation of printing machine industry was still unsatisfactory in the first quarter of 2014.Analysis on operation of printing machine industry.a.Market demand was not strong;sales of product undulated and declined.According to the statistics,the total industrial output value fell by 19.28% in the first quarter of 2014 than the average quarter value in 2013; industrial added value decreased by 4.16%; sales revenue dropped by 22.83%. h. Business operation of enterprises was in poor condition. c. R＆D of new products is an important transformation guarantee for enterprises. d. To take self explore new ways upgrading advantages,and explore new ways.