RP-HPLC法同时测定车前子中4种主要成分的含量

目的:建立反相高效液相色谱法同时检测车前子中京尼平苷酸、车前素、麦角甾苷和异麦角甾苷4种主要成分的含量。方法:采用Dikma Diamonsil C18色谱柱(250mm×4.6mm,5μm),流动相为甲醇(A)-0.05‰甲酸水溶液(B),梯度洗脱(0～30min,5%～90%A),流速为1.0mL·min-1,检测波长为205nm,柱温25℃。结果:京尼平苷酸、车前素、麦角甾苷和异麦角甾苷之间的分离度良好;各成分质量与峰面积在测定范围内均呈良好的线性关系(r0.9998);平均加样回收率(n=6)分别为98.17%(RSD=3.55%)、104.36%(RSD=3.77%)、98.97%(RSD=4.35%)和97.63%(RSD=3.12%)。结论:该实验开发的方法可成功应用于车前子中4种主要成分的分析。     

HPLC法测定诺尼果汁中两种环烯醚萜类成分的含量

建立了一种高效液相色谱法同时测定诺尼果汁中车叶草苷酸和去乙酰车叶草苷酸含量的方法。采用Shimpack VP-ODS-C18(250 mm×4.6 mm,5μm)色谱柱,乙腈-磷酸水溶液为流动相,流速为0.5 min/mL,检测波长为237 nm。在此条件下,车叶草苷酸和去乙酰车叶草苷酸分离良好,浓度分别在5μg/mL~50μg/mL和25μg/mL~250μg/mL范围内线性关系良好,平均加样回收率为99.02%和102.15%,RSD值为1.58%和2.40%。西沙诺尼果汁车叶草苷酸和去乙酰车叶草苷酸平均含量为0.204 mg/mL和1.640 mg/mL。     

西沙诺尼果汁中车叶草苷酸含量的高效液相色谱测定

建立了一种高效液相色谱分析方法,用于测定诺尼果汁车叶草苷酸的含量。采用Shim-pack VP-ODSC18(250 mm×4.6 mm,5μm)色谱柱,乙腈-冰醋酸水溶液为流动相,流速为1.0 min/mL,检测波长为230 nm。在此色谱条件下,车叶草苷酸分离度较好,浓度在5⁵0μg/mL内,线性关系良好,检测限为0.08μg/mL,加样回收率为99.75%,RSD值为2.25%。西沙诺尼果汁和大溪地诺尼果汁车叶草苷酸平均含量分别为0.218和0.179 mg/mL。     

HPLC法测定山茱萸及其保健酒中马钱苷的含量

建立了测定山茱萸及其保健酒中马钱苷含量的高效液相色谱分析法.样品用80%甲醇回流提取并用0.45μm微孔滤膜过滤.色谱柱为Phenomsil C18 BDS柱(250mm×4.6mm,5μm),柱温为35℃,马钱苷检测波长为236nm,流动相为乙腈-水(1486),流速为1mL/min.该方法测得马钱苷的线性范围为0.092μg/mL～0.92μg/mL,回归方程为A=1264.1C 18.992(R=0.9997),平均回收率为99.82%,RSD=l.95%(n=5)山茱萸及其保健酒中马钱苷的含量分别为1.378%、0.703%.此法准确、快捷、重复性好,适合于马钱苷的含量测定.     

HPLC测定来那替尼片含量

目的建立HPLC测定来那替尼片含量的方法。方法采用Merck PurospherStar RP-18 endcapped色谱柱(4.0 mm×250 mm,5μm),流动相为磷酸盐缓冲液-甲醇(70:30),流速1.0 mL/min,检测波长240nm。结果来那替尼在10.02~120.30μg/mL浓度范围内线性较好(r=1.0000),平均回收率为99.59%,RSD为0.33%。结论该方法能方便、快速、准确地测定来那替尼片含量。     

HPLC测定撑篙竹竹叶中异牡荆苷的含量

建立HPLC测定撑篙竹竹叶中异牡荆苷的含量。采用反相高效液相色谱法,色谱柱:Z0RBAX SB-C18(2.1 mm×100 mm,3.6μm),甲醇(A)-0.1%冰醋酸水溶液(B)为流动相,梯度洗脱(0 min~3 min,85%~70%B;3 min~6 min,70%~55%B;6 min~9 min,55%~35%B;9 min~12 min,35%~35%B;12 min~15 min,35%~70%B;15 min~18 min,70%~85%B),流速0.6 mL/min,检测波长340 nm,柱温30℃。异牡荆苷在1.733 1μg/mL~10.832 0μg/mL呈良好的线性关系(r=0.999 6),平均回收率为98.01%,RSD1.02%,试验测得异牡荆苷的含量为2.928 5 mg/g。     

保健食品中6种蒽醌类成分的测定

目的:建立高效液相色谱法检测减肥保健食品中蒽醌类成分芦荟苷、芦荟大黄素、大黄酸、大黄素、大黄酚和大黄素甲醚的测定方法。方法:采用Agilent ZORBAX C18柱(4.6 mm×250 mm,5μm),以0.02 mol/L乙酸铵溶液(含0.05%乙酸)(A)-甲醇(B)为流动相,梯度洗脱,流速1.0 mL/min,柱温25℃,检测波长254 nm。结果:6种化合物标准曲线线性关系良好,所有化合物的线性相关系数(r)都大于0.990,检出限均低于0.3μg/mL,各化合物回收率在80%~105%,相对标准偏差小于4%。结论:方法简便、快速、灵敏、准确,适于减肥保健食品中目标含量的测定。     

高效液相色谱法同时测定粮食中6种大豆异黄酮

目的建立高效液相色谱法(high performance liquid chromatography,HPLC)测定粮食中6种大豆异黄酮(大豆苷、大豆黄苷、染料木苷、大豆素、大豆黄素和染料木素)含量的分析方法。方法准确称取一定量粉碎混匀后的样品,经80%甲醇提取后取上清液,过0.22μm有机相滤膜上机。采用Thermo Syncronis C18柱(250 mm×4.6 mm,5μm),以0.5%甲酸水溶液(A)、乙腈(B)和甲醇(C)作为流动相进行梯度洗脱,流速0.8m L/min,柱温为35℃,于紫外检测器波长260 nm处检测,大豆异黄酮各组分含量以外标法进行定量。结果本方法在30 min内完成6种大豆异黄酮的分离分析,大豆异黄酮各组分浓度在0.2~50μg/mL范围内呈良好的线性关系(r0.999),平均加标回收率为96.9%~107.8%,相对标准偏差(relative standard deviation,RSD)为0.6%~5.0%,检出限为0.03~0.1μg/mL,定量限为0.1~0.3μg/mL。结论建立的方法具有较高的灵敏度和重复性,能满足不同粮食种类中大豆异黄酮含量测定。     

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。     

HPLC-UV测定红酒中7种黄酮苷元及其生物活性物

建立了三元梯度的高效液相色谱法(HPLC)测定红酒中的桑色素、槲皮素,山奈酚、异鼠李素、木犀草素、芹菜素等苷元的含量的方法。采用Luna C18(4.6mm×150mm,3μm)色谱柱,预柱(4mm×3.0mm),柱温为50℃,流动相:A相乙腈,B相乙醇,C相为0.2%磷酸水溶液。流速为0.25mL/min,梯度淋洗,检测波长265nm。结果显示:各黄酮苷元在0.7mg/L~32.0mg/L呈线性关系,样品的加标平均回收率为98.2%~101.1%,RSD为1.88%~2.85%,该方法简便、准确,可用于天然产物中黄酮苷元的含量的测定。     

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.     

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.