刺五加籽乙醇提取物对小鼠抗运动疲劳作用的影响

研究刺五加籽乙醇提取物对小鼠抗疲劳作用的影响。将40只小鼠随机分为对照组、低剂量组、中剂量组、高剂量组。小鼠每天灌胃1次低、中、高剂量的刺五加籽乙醇提取物,每天2次游泳运动训练,为期7周后,测定小鼠的体重,肌糖原、肝糖原、血乳酸(LAC)、血尿素氮(BUN)含量以及超氧化物歧化酶(SOD)、乳酸脱氢酶(LDH)活力。结果表明:与对照组相比,刺五加籽乙醇提取物对小鼠体重无影响,可增加小鼠游泳的力竭时间,增加体内肝糖原与肌糖原的水平,减少血乳酸(LAC)的影响,增加超氧化物歧化酶(SOD)与乳酸脱氢酶(LDH)的活力,降低血尿素氮(BUN)的含量,并且刺五加籽乙醇提取物剂量越高,效果越明显。说明刺五加籽乙醇提取物对机体抗疲劳作用有良好的功效。     

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.     

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。     

玫瑰红景天提取物rosavin抗疲劳作用的实验研究

目的:研究玫瑰红景天提取物rosavin对小鼠的抗疲劳作用.方法:实验分为对照组、rosavin低、中、高剂量组(60,180,360mg/kg mb)以及红景天苷阳性对照组(180mg/kg mb,),对照组灌胃生理盐水,连续灌胃30d分别测定小鼠力竭游泳时间,运动后肌乳酸、肝糖原、肌糖原和血清尿素氮含量.结果:与对照组比较,rosavin组的高、中、低剂量组均能延长小鼠力竭游泳时间(p＜0.05),运动后肝糖原(p＜0.05)、肌糖原含量高于对照组小鼠,肌乳酸浓度明显低于对照组(p＜0.05).与红景天苷阳性对照组比较,同等剂量下红景天苷抗疲劳效果略优于rosavin,rosavin高剂量组与红景天苷抗疲劳效果相当,两者差异没有显著性(p＞0.05).结论:rosavin有缓解体力疲劳的作用.     

黄秋葵提取物的抗疲劳活性研究

研究不同提取溶剂的黄秋葵提取物抗疲劳活性。制备水、乙醇、乙酸乙酯、正丁醇部位黄秋葵提取物,通过小鼠负重游泳时间、测定血清尿素氮、肝糖原和血乳酸含量,比较不同提取溶剂的黄秋葵提取物抗疲劳活性。水提物及醇提物均可延长小鼠负重游泳时间,提高肝糖原水平,减少运动过后小鼠血乳酸、血清尿素氮的积累,不同提取溶剂的黄秋葵提取物抗疲劳活性强弱顺序为:水乙醇乙酸乙酯正丁醇。秋葵水提物及醇提物均有明显抗疲劳活性。     

蜂王浆主蛋白对小鼠的抗疲劳作用

为了探讨蜂王浆主蛋白对小鼠抗疲劳能力的作用及其生理机制,通过给小鼠灌胃低、中、高3个剂量组蜂王浆主蛋白,同时设立对照组,观察小鼠体重、脏器系数、负重游泳时间、常压和急性耐缺氧时间、肝糖原和肌糖原含量、血乳酸、乳酸脱氢酶、尿素氮等指标的变化。结果表明:蜂王浆主蛋白能延长小鼠负重游泳时间,显著增加小鼠肝糖原和肌糖原含量,减少小鼠运动后血乳酸含量,减少小鼠运动后尿素氮的积累。此外,在常压耐缺氧实验中,与空白对照组相比,蜂王浆主蛋白高剂量组可显著延长小鼠在密闭缺氧条件下的存活时间;在急性脑缺血性缺氧实验中,各实验组张口喘气时间均长于对照组。蜂王浆主蛋白对小鼠具有显著的抗疲劳的作用。     

天然酵素运动饮料的抗疲劳性研究

目的研究天然酵素运动饮料对小鼠的抗疲劳作用。方法将健康雄性小鼠随机分为4组,低、中、高剂量组和对照组,灌胃剂量分别为10、20、60和0 mL/(kg·bw),即对照组按同体积纯净水灌胃,喂养30 d,末次给药30min后,测定负重游泳时间、尿素氮、血乳酸、肌乳酸和肝糖原含量。结果与对照组相比,实验组小鼠的负重游泳时间和肝糖原含量明显增加(P0.05),血清尿素氮、血乳酸和肌乳酸含量明显降低(P0.05),且存在着一定的浓度依赖性。结论此天然酵素运动饮料对小鼠增强运动耐力和消除疲劳具有一定的作用。     

鹰嘴豆多糖抗疲劳生物功效及其机制研究

探讨鹰嘴豆多糖的抗疲劳生物功效及其机制。采用水浸提法提取鹰嘴豆多糖后,对小鼠进行分组灌胃试验:将小鼠分为对照组及鹰嘴豆多糖低、中、高三个不同浓度剂量组灌胃25d,进行负重游泳试验,并对其血清与肝脏的超氧化歧化酶(Superoxide Dismutase SOD)活性、丙二醛(Maleic Dialdehyde MDA)含量及肌糖原、肝糖原、血清尿素氮、血乳酸水平等进行测试。结果显示:鹰嘴豆多糖能延长小鼠的负重游泳时间,增强小鼠血清和肝脏的SOD活性,降低MDA含量,提高肝糖原、肌糖原储备量,降低小鼠运动后血清尿素和血乳酸水平。说明鹰嘴豆多糖具明显的抗疲劳功能。     

组培苗鲜罗汉果抗疲劳活性研究

目的:研究组培苗鲜罗汉果的抗疲劳活性。方法:实验将小鼠随机分为组培苗鲜罗汉果提取物高、中、低剂量组(2.0、1.0、0.5g/kg)、组培苗鲜罗汉果皂苷组(0.15g/kg)、模型组和空白组,给小鼠灌胃21d,未次灌胃30min后测定其负重游泳时间,并测定其血乳酸(BLA)、血尿素氮(BUN)、肝糖原(LG)、肌糖原(MG)含量和乳酸脱氢酶(LDH)的活力。结果:组培苗鲜罗汉果提取物和组培苗鲜罗汉果皂苷均能显著延长小鼠力竭游泳时间,降低小鼠血乳酸和血尿素氮的含量,提高小鼠体内肝肌糖原的储备量及运动后乳酸脱氢酶活力。结论:组培苗鲜罗汉果具有明显的抗疲劳活性;组培苗鲜罗汉果皂苷的作用比鲜罗汉果提取物更显著,提示鲜罗汉果的抗疲劳活性与富含的罗汉果皂苷有直接关系。     

蚂蚁粉的抗疲劳作用的实验研究

研究蚂蚁粉的抗疲劳作用.蚂蚁粉分3个剂量组即：83 mg/kg,167 mg/kg,250 mg/kg给小鼠灌胃,对照组为蒸馏水.30 d后小鼠游泳造成疲劳,测定血乳酸、尿素氮、肝糖原及小鼠游泳时间等指标.结果：蚂蚁粉的3个剂量组均能显著提高小鼠肝糖原的储备量;降低小鼠游泳后血乳酸曲线下面积;降低运动后血清尿素氮含量,加速体内尿素氮的清除速率,提高小鼠的游泳时间.结论：蚂蚁粉有抗疲劳作用.     

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