梅花鹿鹿角脱盘提取物抗疲劳作用研究

目的:探讨梅花鹿鹿角脱盘提取物的抗疲劳作用。方法:选用雄性小鼠分为3个剂量组和空白对照组,灌胃给药不同剂量的梅花鹿鹿角脱盘提取物30 d后,测定小鼠力竭游泳时间、血乳酸含量、肝糖原储备以及血清尿素氮等指标。结果:与对照组比较,实验组小鼠负重游泳时间延长,血乳酸水平降低,肝糖原和血清尿素氮含量与空白组无明显差异。结论:梅花鹿鹿角脱盘提取物具有抗疲劳的作用。     

迎玺牌“硬是好”酒对小鼠的抗疲劳作用

目的:研究迎玺牌"硬是好"酒对小鼠的抗疲劳作用。方法:将120只雄性昆明种小鼠随机分为4组,灌胃15d后称量小鼠体重,分别检测小鼠力竭游泳时间,运动后血清尿素氮、全血乳酸以及肝、肌糖原含量。结果:迎玺牌"硬是好"酒对小鼠的体重增长无明显影响,但迎玺牌"硬是好"酒明显延长小鼠力竭游泳时间,降低运动后血清尿素氮和血乳酸浓度,升高肝糖原和肌糖原含量,与阴性对照组比较,差异有显著性(P<0.05或P<0.01)。结论:迎玺牌"硬是好"酒对小鼠有明显的抗疲劳作用。     

大豆低聚肽抗氧化及抗疲劳作用评价

对大豆低聚肽的抗氧化活性进行了研究,分别测定大豆低聚肽的总抗氧化能力、抗超氧阴离子自由基能力、羟自由基和烷基自由基的清除率;并通过动物实验考察大豆低聚肽的抗疲劳作用,测定小鼠力竭游泳时间、血浆尿素氮含量、肝糖原和肌糖原含量。结果表明:大豆低聚肽总抗氧化能力最大为13.86U/mL,抗超氧阴离子自由基能力最大为158.67U/L,对羟自由基的最大清除率为17.11%,对烷基自由基的最大清除率为31.97%;对大豆低聚肽抗疲劳作用的研究表明,游泳时间最长为高剂量组(8.0g/kg)45.51min,血浆尿素氮含量最低为高剂量组(8.0g/kg)17.05mmol/L,肝糖原含量最高为高剂量组(8.0g/kg)17.45mg/g,肌糖原最高含量为中剂量组(4.0g/kg)1.53mg/g。由此可见,大豆低聚肽具有一定的抗氧化活性及抗疲劳作用。      

添加酪蛋白水解肽乳粉的抗疲劳作用研究

目的:通过动物实验评价添加酪蛋白水解肽乳粉的抗疲劳功能。方法:对健康雄性BALB/c小鼠连续28d灌胃受试物,然后通过小鼠负重游泳实验以及血尿素氮、血乳酸、肝糖原等疲劳指标的测定,评价酪蛋白水解肽及其配方乳粉的抗疲劳作用。结论:酪蛋白水解肽和添加酪蛋白水解肽的乳粉使小鼠游泳时间延长,使血乳酸、尿素氮含量降低,提高肝糖原含量,显示出一定的抗疲劳作用,延缓疲劳的产生。     

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。     

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。     

高山红景天提取物抗疲劳作用研究

将小鼠分为正常对照组和红景天提取物低、中、高剂量组治疗组,连续灌胃28 d.进行小鼠负重游泳试验,测定血乳酸含量、血清尿素氮含量、肝糖原含量.实验结果表明,红景天提取物能显著延长小鼠力竭游泳时间,增加肝糖原的含量,降低血乳酸与血清尿素氮的含量.红景天提取物具有抗疲劳作用.     

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     

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。     

海参肽对小鼠抗疲劳作用的研究

通过采用不同浓度的海参肽灌胃,研究海参肽对小鼠的抗疲劳作用.结果发现,海参肽对小鼠体重无显著影响,能明显延长小鼠的负重游泳时间和转棒时间,显著降低运动后小鼠的血尿素氮含量,提高了肝糖原含量.研究表明：海参肽具有明显的抗疲劳功效.     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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