玉米肽抗疲劳作用的实验研究

目的:为了开发、利用玉米肽资源、对玉米肽进行了抗疲劳作用研究。方法:进行玉米肽对小鼠游泳时间、小鼠爬杆时间、血乳酸、血中尿素氮、肝糖原含量和肌糖原含量等的影响实验。结果:玉米肽能增强小鼠游泳耐力、延长爬杆时间,降低血乳酸、血中尿素氮含量,提高肝糖原含量和肌糖原含量。结论:玉米肽具有抗疲劳作用。     

乳源活性肽抗疲劳作用的实验研究

本实验研究酶解乳蛋白后产生的小分子肽对小鼠抗疲劳能力的影响。实验用酶水解乳蛋白产肽,利用超滤及SephadexG-15凝胶柱层析分离出6个组分,以小鼠负重游泳时间为指标从这6个组分中筛选出1个抗疲劳作用最优组分,并通过测定小鼠负重游泳时间、小鼠运动后血清尿素氮、肝糖原含量和游泳前、游泳后0min和20min血清乳酸含量的变化,对其抗疲劳功能进行了评价。结果显示乳蛋白水解肽能显著增加小鼠负重游泳时间,降低小鼠运动后血清尿素氮含量,提高了小鼠肝糖原含量并能降低游泳后血清乳酸的增加量。表明乳蛋白水解肽目标组分能够提高小鼠的抗疲劳能力。     

玉米肽抗疲劳作用的实验研究

为了开发、利用玉米肽资源、对玉米肽进行了抗疲劳作用研究。进行玉米肽对小鼠游泳时间、小鼠爬杆时间、血乳酸、血中尿素氮、肝糖原含量和肌糖原含量等的影响实验。结果表明，玉米肽能增强小鼠游泳耐力、延长爬杆时间，降低血乳酸、血中尿素氮含量，提高肝糖原含量和肌糖原含量。玉米肽具有抗疲劳作用。为玉米肽的开发和应用提供了理论基础和实验依据。     

玉米肽抗疲劳作用的实验研究

为了开发、利用玉米肽资源 ,对玉米肽进行了抗疲劳作用研究。进行玉米肽对小鼠游泳时间、小鼠爬杆时间、血乳酸、血中尿素氮、肝糖原含量和肌糖原含量等的影响实验。研究表明 ,玉米肽能增强小鼠游泳耐力、延长爬杆时间 ,降低血乳酸、血中尿素氮含量 ,提高肝糖原含量和肌糖原含量     

火麻仁低聚肽对小鼠的抗疲劳作用及其作用于性别间的差异

目的:探究火麻仁低聚肽的抗疲劳功效,及其作用于雌雄个体间的效果与机制。方法:昆明小鼠雌雄各半,随机分为空白对照组(生理盐水组)、阳性对照组(乳清蛋白组)和低、中、高剂量组,各组灌胃相应药物,灌胃28 d。测定小鼠体重、力竭游泳时间、血乳酸(blood lactic acid, BLA)、血尿素氮(blood urea nitrogen, BUN)、肝糖原(liver glycogen, LG)含量。结果:不考虑性别,火麻仁低聚肽对小鼠体重无显著影响,能明显延长小鼠力竭游泳时间,减少小鼠血乳酸与血尿素氮水平,提高小鼠肝糖原含量。考虑性别因素,中剂量火麻仁低聚肽使雌性小鼠体重显著升高,使雄性小鼠体重显著降低;低剂量火麻仁低聚肽能明显使雄性小鼠力竭游泳时间延长,血尿素氮含量降低,使雌性小鼠体重、力竭游泳时间、肝糖原含量明显升高,血尿素氮含量明显下降;高剂量火麻仁低聚肽使雄性小鼠力竭游泳时间和肝糖原含量明显升高,体重和血尿素氮含量明显降低,而雌性小鼠体重、力竭游泳时间和肝糖原含量明显升高,血乳酸值和血尿素氮含量明显下降。结论:火麻仁低聚肽具有抗疲劳功效,剂量在不同性别中对抗疲劳效果有显著影响。     

柳黄酮抗疲劳作用的实验研究

目的：为了开发、利用柳叶资源、对柳黄酮进行了抗疲劳作用研究。方法：进行柳黄酮对小鼠游泳时间、小鼠爬杆时间、血乳酸、血中尿素氮、肝糖原含量和肌糖原含量等的影响实验。结果：柳叶能增强小鼠游泳耐力、延长爬杆时间，降低血乳酸、血中尿素氮含量，提高肝糖原含量和肌糖原含量。结论：柳黄酮具有抗疲劳作用。     

核桃肽对小鼠的抗疲劳作用

目的:探讨核桃肽对雄性小鼠的抗疲劳作用。方法:采用SPF级雄性ICR小鼠240只按体重随机分为5组,分别为空白对照组、乳清蛋白组[220mg/(kg·BW)]和3个核桃肽干预组[110、220、440mg/(kg·BW)]。每日经饮水给予受试样品30d,进行负重游泳实验测定各组小鼠负重游泳力竭时间,采用全自动生化仪测定各组小鼠血清尿素氮含量和乳酸脱氢酶活力,采用紫外分光光度计法检测各组小鼠血乳酸水平,采用试剂盒检测各组小鼠肝、肌糖原含量。结果:核桃肽可提高乳酸脱氢酶活性,降低血乳酸和血清尿素氮含量,提高肌糖原储备量,显著延长负重游泳时间。结论:核桃肽具备一定的缓解疲劳的作用。     

电裂解大豆肽抗疲劳作用的实验研究

实验观察电裂解大豆肽对小鼠抗疲劳作用的影响。电裂解大豆肽分为高、中、低剂量组,分别为7.5、5.0、2.5g/kg.d喂饲小鼠30d,观察小鼠爬杆时间、负重游泳时间,测定血清尿素氮、肝糖原和肌糖原含量,测定游泳前后0～20min内血清乳酸含量的变化。实验结果表明电裂解大豆肽能显著延长小鼠爬杆时间和负重游泳时间,增加小鼠运动过程中肝糖原和肌糖原含量,减少血清尿素氮的含量,并能显著降低游泳后血清乳酸的增加量。结论为电裂解大豆肽具有明显的抗疲劳作用。     

大豆肽分子量与缓解疲劳作用关系的研究

为了研究大豆肽分子量与缓解疲劳作用的关系,分别给小鼠灌胃不同分子量的大豆肽,然后测定缓解疲劳指标,包括体重、游泳时间、血清尿素氮含量、肝糖原含量和血乳酸含量。试验结果表明,大豆肽对小鼠体重变化影响不显著,但是游泳时间延长,血清尿素氮含量降低,肝糖原含量提高,血乳酸含量降低。其中相对分子质量为875和500的大豆肽对缓解疲劳指标影响显著。大豆肽分子量越小,缓解疲劳作用效果越明显。     

猪皮明胶肽抗小鼠外周肌肉疲劳作用的研究

试验在研究酶解猪皮明胶制备抗疲劳肽较适条件和较佳工艺的基础上,通过负重游泳运动建立动物肌肉外周疲劳模型,经过对小白鼠灌胃饲养明胶肽实施营养干预,在检测血乳酸、血尿素氮、肝(肌)糖原含量和运动时间的基础上分析、评价明胶肽抗外周疲劳功效。试验结果证实:和蒸馏水饲养组对比,明胶肽能延长动物运动时间(P<0.01),降低疲劳后的血乳酸(P<0.01)和尿素氮含量(P<0.01),提高肝肌糖原(P<0.01)含量,具有显著的抗疲劳功效,可作为抗疲劳功能食品的添加剂。     

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.     

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