高效液相色谱法测定保健食品中番茄红素的含量

目的建立保健食品中番茄红素高效液相色谱法(high performance liquid chromatography,HPLC)含量测定方法。方法色谱柱为Grace Apollo C_(18)柱(250 mm×4.6mm,5μm),以甲醇-乙酸乙酯(95:5,V:V)为流动相等度洗脱,柱温30℃,流速1mL/min,检测波长472 nm。结果番茄红素在1.01～50.45μg/m L浓度范围内线性关系良好(r~2=0.9997),高、中、低3个浓度水平下的加样回收率为96.20%～105.60%,相对标准偏差(relative standard deviation,RSD)值不大于2.50%。采用该方法对市售7个厂家的产品进行测定,发现不同厂家产品中番茄红素的含量相差很大,其中3个厂家的含量低于其标示量,质量问题值得引起关注。结论本文建立的方法简单、准确,同时精密度、重复性良好,是对现有国家标准方法 GB/T 22249-2008的有效改进,可用于番茄红素保健食品的质量控制。     

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。     

功能食品中番茄红素的高效液相色谱检测方法

建立了一种广泛适用于功能食品的测定番茄红素含量的高效液相色谱检测方法。样品前处理采用水油两相萃取方法;色谱条件为色谱柱InertsilODS-SP柱(5μm,4.6×250mm),流动相为乙腈:甲醇=1:1,流速为1.2mL/min,检测波长为472nm。分析结果表明,番茄红素在0.30～50.0μg/mL线性良好,相关系数R2=0.9998,加标回收率98.6%,RSD为3.0%,说明该方法准确可靠。     

HPLC法测定冬枣环磷酸腺苷含量

采用HPLC法对冬枣中环磷酸腺苷(cAMP)含量进行测定。色谱条件:色谱柱为Hypersil-ODS2(25cm×4.6mm,5μm)柱,流动相为V(甲醇):V(0.05mol/L磷酸二氢钾)=10:90,流速1.0mL/min,紫外检测器UV254nm×0.2AUFS。测定结果表明:标准曲线在1μg/mL～50μg/mL范围内线性良好,回收率为99.14%,相对标准误差为1.32%(n=6)。     

番茄果实中全反式番茄红素的C30-HPLC外标法定量检测

为建立一种在C30-HPLC 上使用外标法对番茄红素全反式异构体进行定量检测的方法,采用色谱条件：固定相：YMC Carotenoid columu C30 色谱柱(4.6mm × 250mm,SOD-5μm,Waters);流动相A：乙腈- 甲醇(3:1,V/V);流动相B：甲基叔丁基醚(MTBE);流动相A 与B 中分别添加0.05%(V/V)的三乙胺;线性梯度洗脱：B 在20min 内由0 增至80%,20～35min 内B 维持在80%;流速：1mL/min;色谱图检测波长470nm;进样量：20μL;柱温：室温。结果表明：此方法的最小定量限为0.10μg/mL,在10～100μg/mL 范围内质量浓度与组分峰面积的线性回归方程为y=212181x,R2=0.9738。相对标准偏差为4.04%。外标加样回收率为97.34%(RSD 为0.904%)。应用本方法可对番茄果实中的全反式番茄红素进行定量分析。     

应用C30-HPLC-PDA分离与鉴定番茄红素几何异构体

在装备了二极管阵列检测器(PDA)的高压液相色谱(HPLC)上,应用C30柱,番茄红素几何异构体获得了良好的分离。色谱条件为:WatersYMCCarotenoidS-5(4.6×250mm)柱;乙腈-甲醇-三乙胺(75∶25∶0.05,V/V)为流动相A,甲基叔丁基醚-三乙胺(100∶0.05,V/V)为流动相B,流动相B在8min内由0%线性增至55%,而后维持恒定至35min;流速:1.0mL/min;PDA波长范围:260～700nm;进样量:20μL。根据各组分的色谱行为、光谱特征和在碘催化下发生几何异构的产物分析,13,13'-顺式番茄红素、11,11'-顺式番茄红素、9,9'-顺式番茄红素和全反式番茄红素4个组分被鉴定。本项研究的结果奠定了应用C30-HPLC-PDA定量检测番茄红素几何异构体的基础。     

高效液相色谱法测定保健食品中绞股蓝皂苷XLIX的含量

目的建立高效液相色谱法检测保健食品中绞股蓝皂苷XLIX含量的检测方法。方法样品经甲醇提取,采用Ultimate XB-C18柱(4.6 mm×100 mm, 3μm)进行色谱分离,以乙腈-水作为流动相进行梯度洗脱,流速为0.5 mL/min,检测波长为203 nm,柱温40℃。结果绞股蓝皂苷XLIX在0.001～1 mg/mL范围内线性关系良好(线性方程:Y=53.06X+86.3,r=0.999);绞股蓝皂苷XLIX在0.1、0.2、1.0g/kg~3个添加水平上进行加标回收实验,平均回收率为86.1%～104.9%,相对标准偏差为1.6%～6.0%,方法检出限为5mg/100g或5 mg/100 mL,定量限为10 mg/100 g或10 mg/100 mL。结论本方法前处理过程简单、分析时间短、准确度高,适用于保健食品中绞股蓝皂苷XLIX的检测。     

HPLC法测定肺筋草中薯蓣皂苷的含量

采用高效液相色谱法测定肺筋草中薯蓣皂苷的含量,建立肺筋草中薯蓣皂苷含量测定的方法。采用Shimadzu VP-ODS柱(4.6 mm×250 mm,5μm)色谱柱,V(甲醇)∶V(水)=31∶69为流动相,流速为0.5 mL/min,柱温为45℃;进样量为10μL,检测波长206 nm。研究表明:薯蓣皂苷在10.6μg/mL～106μg/mL(r=0.998 8)范围内线性关系良好,平均回收率为97.02%。此方法简便、准确、重现性好,适用于薯蓣皂苷的含量测定。     

高效液相色谱-二极管阵列检测法同时测定不同品种巴旦杏中槲皮素、山奈酚的含量

目的:建立用高效液相色谱-二极管阵列检测法测定新疆不同品种巴旦杏仁中槲皮素、山奈酚含量的方法。方法:色谱柱:HC-C18柱(250 mm×4.6 mm,5μm);流动相:甲醇-0.4%磷酸溶液(55∶45,V/V);检测波长:360 nm;柱温:30℃;流速:1.00 mL/min。结果:槲皮素和山奈酚分别在1.0~30μg/mL(r=0.999 3)和0.5~40μg/mL(r=0.999 8)质量浓度范围内呈良好的线性关系,平均回收率分别为102.0%(相对标准偏差为2.08%,n=5)和102.8%(相对标准偏差为2.21%,n=5)。结论:该方法简便、快速、有效、准确、具有良好的重复性和回收率,可作为巴旦杏仁的质量控制和评价。     

高效液相色谱法同时测定榅桲籽中蔷薇酸和委陵菜酸的含量

目的建立高效液相色谱法(high performance liquid chromatography,HPLC)同时测定榅桲籽中蔷薇酸和委陵菜酸含量的分析方法。方法样品经石油醚脱脂后,用甲醇超声提取,采用Kromasil 100-5-C₁₈(4.6 mm×250 mm, 5μm)色谱柱分离,以甲醇-0.2%磷酸(70:30, V:V)作为流动相,流速1.0 mL/min,柱温30℃,进样体积为10μL,在210nm波长下进行检测。结果蔷薇酸和委陵菜酸分别在7.92~55.44μg/mL和3.76~18.8μg/mL浓度范围内线性关系良好,相关系数均大于0.999,加样回收率为90.4%~98.2%(n=6)。结论该方法简便、快速、准确、重现性好,可用于榅桲籽中蔷薇酸和委陵菜酸的快速测定。     

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.     

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.