竹叶中黄酮的提取研究

采用水浴和超声分别对竹叶中黄酮类物质的提取方法进行研究。结果表明：水浴法以１５倍原料重的７５％丙酮溶液在８０℃浸提１ｈ为最佳；超声法以２０倍原料重的７５％丙酮溶液超声３０ｍｉｎ浸提为最佳，超声法优于水浴法。     

女真子中黄酮类物质的提取

设计正交试验，采用水浴的方法对女真子中黄酮类物质的提取方法进行研究。结果表明：以15倍原料重的50％甲醇溶液在65℃水浴中浸提2小时为最佳。     

苦荞麦麸皮中黄酮的提取工艺条件研究

采用乙醇溶液浸提、水溶液浸提、乙醇抽提三种方法提取苦荞麦麸皮中的黄酮类化合物。结果表明：乙醇溶液浸提的最佳提取上艺条件是：A3B2C2D2，即用10倍75％乙醇在70-75℃下浸提4h；水浸提的最佳工艺条件是：最佳提取组合为A3B3C3，即用20倍水量在70-75℃下浸提6h。乙醇溶液抽提的最佳工艺条件是：95％的乙醇回流抽提8h。     

肉苁蓉提取液对N02-清除作用的体外实验研究

研究肉苁蓉水浴浸提物与超声辅助浸提物在体外模拟胃液pH条件下清除亚硝酸根的最佳提取工艺。结果表明,水浴浸提最佳工艺条件为:80%的乙醇溶剂,水浴温度80℃,料液比1:20,浸提时间120min;超声辅助浸提的最佳提取条件为:80%的乙醇溶剂,30℃的超声温度,料液比1:20,超声时间20min,超声功率60Hz;在反应时间8min,浓度为0.0720g/mL时,水浴浸提物与超声辅助浸提物对NO2-的清除率分别为99.33%和84.21%。肉苁蓉对亚硝酸根有很强的清除能力,并随着浓度的增加清除作用加强,且水浴提取物对亚硝酸根清除作用显著高于超声辅助浸提物。     

女真子中黄酮类物质的提取

设计正交试验,采用水浴的方法对女真子中黄酮类物质的提取方法进行研究。结果表明:以15倍原料重的50%甲醇溶液在65C水浴中浸提2小时为最佳。     

乙醇法提取姬松茸多酚物质的研究

以姬松茸干品为原料,以乙醇作提取液,研究乙醇浓度、浸提温度、料液比、浸提时间和浸提次数等因素对多酚物质提取效果的影响。结果表明,乙醇提取姬松茸多酚物质的最佳工艺条件为：以体积分数为80％的乙醇作提取液,料液比为1：25,在60℃下水浴浸提2h,浸提次数为3次。在此条件下,姬松茸多酚物质的得率为2．118％。     

超声法制备胡椒油树脂工艺研究

以干胡椒为原料,乙醇为有机萃取剂,在超声波辅助下提取胡椒油树脂。得出最佳工艺为:超声功率50%、超声浸提时间50min、乙醇萃取浓度75%、固液比为1∶35、浸提温度70℃。     

红薯中黄酮提取及抗氧化研究

作者研究了从红薯中提取黄酮类活性物质的最佳方法以及该提取物的抗氧化性。设计四因素三水平的正交试验,用水浴法和超声法对红薯中黄酮类物质的提取方法进行了研究,选取最佳条件。通过DPPH体系法,氮蓝四唑(NBT)光化合还原法和抗坏血酸Cu2+-H2O2体系法,分别研究最佳条件下薯皮薯肉提取物的抗氧化性。结果表明:水浴法以固液质量体积比1g∶15mL,体积分数70%乙醇水溶液在65℃浸提1h为最佳;超声法以固液质量体积比1g∶15mL,体积分数70%乙醇水溶液超声35min浸提为最佳。在提取方法中,超声法优于水浴法,其黄酮得率分别为2.80mg/g和2.14mg/g;抗氧化性实验表明,薯肉中提取的黄酮类活性物质对DPPH、O2-·、·OH的清除率分别可达80.34%、66.23%、53.32%,薯皮中提取的黄酮类活性物质的清除率分别可达86.81%、84.59%、75.06%。     

咖喱粉中姜黄素检测样品的预处理方法研究

采用索氏提取法和超声法对市售某品牌的咖喱粉中姜黄素检测样品进行预处理,并对两种方法进行比较,以正交实验法确定两种预处理方法的最佳工艺条件。实验结果表明,超声法要优于索氏提取法,其最佳工艺条件为提取剂85%乙醇,浸提时间为5 min;操作频率为100 W;浸提温度为60℃。通过两种方法的比较,可知在同等单位下提取姜黄素的量超声法是索氏提取法的4.646倍。     

马齿苋黄酮提取工艺研究

以浸取剂浓度、料液比、浸提温度、浸提时间为主要考察因素,运用正交试验设计,作L16(44)正交试验,对马齿苋黄酮类物质的提取工艺进行了研究.并对马齿苋提取总黄酮使用大孔树脂柱进行简单的提纯.结果表明:以20倍原料重的70%乙醇水溶液在75℃,浸提2.5 h为最佳提取工艺条件.     

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.