超高效液相色谱-串联质谱法测定大豆中3种异黄酮素

目的建立超高效液相色谱-串联质谱法测定大豆中金雀异黄素(genistein)、大豆苷元(daidzein)和黄豆黄素(glycitein)的含量。方法样品经过乙醇-水(3:1,V:V)提取,用AcquityUPLC?HSST3柱(3.0mm×150mm,1.8μm)分离,以甲醇和0.1%甲酸溶液作为流动相进行梯度洗脱,电喷雾负离子模式(electrospray ionization, ESI-)电离,多反应监测模式(multiple reaction monitoring mode, MRM)进行检测。结果金雀异黄素、大豆苷元和黄豆黄素在2.0～200μg/L范围内线性关系良好(r20.999),方法的检出限分别为0.5、0.4、0.1 mg/kg,在2.5、10.0、40.0 mg/kg添加水平的平均回收率为79.3%～107%,相对标准偏差(n=6)为1.3%～6.8%。结论方法简单、灵敏、准确可靠,适用于大豆中金雀异黄素、大豆苷元和黄豆黄素等3种异黄酮素含量的测定。     

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.     

霉菌型豆豉和纳豆中异黄酮含量的比较研究

目的:比较纳豆和豆豉中异黄酮含量的组成变化。方法:利用超声波提取,采用高效液相色谱法测定,色谱柱填料为Hypersil ODS2(4.6 mm×250 mm,5μm),流动相为甲醇(A)-水(B)进行梯度洗脱,检测波长为255 nm。结果:豆豉与纳豆相比较,豆豉中大豆苷、黄豆黄苷、染料木苷、大豆甙元、黄豆黄素、染料木素的含量分别为11,未检出,25,320,65,380μg/g;纳豆中中大豆苷、黄豆黄苷、染料木苷、大豆甙元、黄豆黄素、染料木素的含量分别为330,73,410,12,3.3,28μg/g。结论:豆豉中甙元的含量高,纳豆中糖苷的含量高。     

超高效液相色谱-串联质谱法测定大豆中异黄酮素含量

目的 以染料木黄酮、大豆苷元和黄豆黄素的含量为指标,建立超高效液相色谱-串联质谱测定大豆中异黄酮素总量的方法。方法 样品用乙醇-水(3+1,V/V)提取,经过β-葡萄糖苷酶水解后,用Acquity UPLC?BEH C18柱(2.1 mm×100 mm, 1.7μm)分离,以甲醇和0.1%甲酸溶液(含5 mmol/L乙酸铵)作为流动相进行梯度洗脱,电喷雾负离子模式(ESI-)电离,多反应监测模式进行检测。结果 染料木黄酮、大豆苷元在5.0～500μg/L范围内线性关系良好(r>0.995),方法的检出限分别为2.7、4.0 mg/kg,在300.0、600.0、1 200 mg/kg添加水平的平均回收率为89.4%～102.2%,相对标准偏差(n=6)为1.5%～4.6%;黄豆黄素在0.5～50.0μg/L范围内线性关系良好(r>0.995),方法的检出限为0.6 mg/kg,在30.0、60.0、120.0 mg/kg添加水平的平均回收率为85.7%～104.0%,相对标准偏差(n=6)为1.3%～2.8%。结论 该方法简单、灵敏、准确可靠,适用于大豆中异黄酮素含量的测定...     

复杂发酵产物中黄豆苷元和雌马酚的定量分析

为解决复杂发酵液背景下非目的代谢物干扰问题,建立一种适用于体外发酵条件下,黄豆苷元及其生物转化物雌马酚的高效液相色谱法分析方法。粪便菌群在脑心浸液肉汤培养基中转化黄豆苷元48 h,经乙酸乙酯提取,C18色谱柱(250 mm × 4.6 mm, 5 μm)分离,流速为0.8 mL/min,柱温25 ℃,进样量20 μL,以水-甲醇-乙腈(体积比5∶3∶2)为流动相,在230 nm和260 nm双波长处检测。结果表明:方法快速、准确,在6.25 ~ 100 μg/mL范围黄豆苷元和雌马酚的线性相关系数(R2)分别为0.9999和0.9996,平均回收率为92.12% ~ 104.34%,相对标准偏差为0.15% ~ 0.24%,检出限分别为0.07 μg/mL和0.05 μg/mL,定量限分别为0.23 μg/mL和0.16 μg/mL。本研究所建方法具有较高的精确度且方法简便,可应用于粪便菌群发酵液中黄豆苷元和雌马酚的定量检测。     

北京地区不同大豆品种异黄酮含量比较研究

异黄酮是大豆生长过程中自然产生的化学物质,被认为可以治疗和预防一些人类依赖激素的疾病.为比较北京地区生态条件下大豆品种间异黄酮含量的差异性,对53个品种种子中3种异黄酮(大豆苷元、染料木素和黄豆黄素)进行测定和分析.结果表明,品种间异黄酮含量存在较大多样性,大豆苷元为39.21～2 363.65 μg/g,染料木素为77.35～1 149.50 μg/g,黄豆黄素为0.0～51.30μg/g,3种异黄酮总量为146.73～2 845.60 μg/g.来自山西和山东品种的异黄酮含量显著高于其他地区的品种.异黄酮总量分别与大豆苷元和染料木素呈极显著正相关,而大豆苷元和染料木素之间没有互作.因此,可以利用高含量大豆苷元或染料木素材料选育高异黄酮品种.     

层析-高效液相色谱法测定保健食品中葛根素的含量

目的 建立测定保健食品中葛根素含量的层析反相高效液相色谱法.方法 D101大孔树脂层析柱(10cm×15cm×1.0 cm)层析,采用ODS C18(250 mm×4.6 mm,5 μm)色谱柱,甲醇 36%乙酸 水=25 3 72作为流动相,检测波长247 nm.结果 葛根素在5.0～50.0μg/ml内呈线性关系,r=O.999 8,方法的回收率为81.6%-100.2%,试样测定RSD为0.84%～1.08%.结论 该方法简便、准确、灵敏,回收率高,分离效果好.     

HPLC法测定绿豆芽中四种大豆异黄酮的含量

建立同时测定绿豆芽中4种大豆异酮(大豆苷、染料木苷、大豆苷元和染料木素)含量的高效液相色谱方法,对从绿豆芽中提取4种大豆异黄酮的工艺进行优化,最佳工艺为:用60%的乙醇在55℃条件下超声提取60 min,料液比为1:12(g/mL),同时探究绿豆发芽不同天数4种大豆异黄酮的含量.采用日本岛津LC-20A高效液相色谱仪进行测定的色谱条件为:色谱柱为 phenomenex C18(150 mm×4.6 mm,5.0 μm),采用乙腈-0.2%甲酸为流动相进行梯度洗脱,流速为0.8 mL/min,检测波长为260 nm.大豆苷,染料木苷,大豆苷元,染料木素的线性范围分别是0.74 μg/mL～100.00 μg/mL,0.74 μg/mL～200.00 μg/mL,0.167 μg/mL～500.00 μg/mL,0.198 μg/mL～160.00 μg/mL(r>0.9996),线性关系良好;加样回收率(n=9)分别为100.02%,98.95%,99.28%,99.63%.     

HPLC法测定保健食品中盐酸氨基葡萄糖含量的研究

目的 建立高效液相色谱法(HPLC)测定保健食品中盐酸氨基葡萄糖含量的简便方法.方法 样品用水超声提取,色谱柱:CAPCELL PAK CR(4.6 mm×150 mm,5 μm);流动相:25 mmol/L乙酸铵+乙腈(加0.1％甲酸)(25 +75,ⅣV);流量1.0 ml/min,检测波长200 nm.结果 盐酸氨基葡萄糖在0.2-26.0 μg范围内呈良好线性,相关系数为1.000;检出限为0.02 μg;回收率99.5％～101.0％;RSD 1.03％.结论 该方法操作简便快速、结果准确可靠,可作为保健食品中盐酸氨基葡萄糖的质量控制监测.     

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。     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.