超临界萃取VE的抗肿瘤活性研究

对超临界萃取菜籽VE,α-VE和菜籽VE α-VE的抗肿瘤作用及对荷瘤小鼠免疫功能的影响进行了研究.通过建立S180移植瘤模型,观察了超临界萃取菜籽VE,α-VE和菜籽VE α-VE的抗肿瘤效果,并进行了病理学和免疫学指标测定.实验发现超临界萃取菜籽VE,α-VE和菜籽VE α-VE有抑制S180肿瘤生长的作用,有明显的抑制肿瘤生长的病理学特征,并能显著增强荷瘤小鼠脾指数、巨噬细胞吞噬功能、二硝基氟苯(DNFB)所致的迟发型超敏反应(DTH)和血清溶血素的含量,超临界萃取菜籽VE和菜籽VE α-VE的效果好于α-VE.     

超临界萃取V_E的抗肿瘤活性研究

对超临界萃取菜籽VE,α-VE和菜籽VE+α-VE的抗肿瘤作用及对荷瘤小鼠免疫功能的影响进行了研究。通过建立S180移植瘤模型,观察了超临界萃取菜籽VE,α-VE和菜籽VE+α-VE的抗肿瘤效果,并进行了病理学和免疫学指标测定。实验发现超临界萃取菜籽VE,α-VE和菜籽VE+α-VE有抑制S180肿瘤生长的作用,有明显的抑制肿瘤生长的病理学特征,并能显著增强荷瘤小鼠脾指数、巨噬细胞吞噬功能、二硝基氟苯(DNFB)所致的迟发型超敏反应(DTH)和血清溶血素的含量,超临界萃取菜籽VE和菜籽VE+α-VE的效果好于α-VE。     

维生素E对小鼠高血脂预防作用研究

成功建立实验性高血脂小鼠模型，观察超临界萃取的总VE、α—VE和总VE α—VE对机体抗氧化，体重，粪脂及血脂水平的影响。结果表明，模型建立45d后，摄入VE的小鼠，其血清中TC，LDL—C和AI，均显著下降。超临界萃取的总VE和α—VE的混合样可以显著降低血清和肝脏TC以及肝系数。结论表明总VE和α—VE可以降低血脂水平，降低LDL—C调节胆固醇的吸收率，增加脂质的排泄，从而起到明显降血脂，预防动脉硬化形成的效果。     

菜籽植物甾醇降小鼠血脂功能的实验研究

以不同剂量(1.5、3.5、6.5 mg/mL)的菜籽植物甾醇给小白鼠灌胃,实验45 d后测定各项指标,并与正常对照组、高脂对照组相比较.结果发现,不同剂量的菜籽植物甾醇能不同程度地降低小鼠血清的总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)和动脉硬化指数(AI).同时能增加粪重和促进粪脂的代谢,但对总甘油三酯(TG)、高密度脂蛋白(HDL-C)不显著.实验还发现,菜籽植物甾醇能降低小鼠肝重和肝系数,降低肝脏中的总胆固醇(TC)、总甘油三酯(TG)含量,说明菜籽植物甾醇降小鼠血脂效果显著.     

两种植物甾醇纳米粒的降胆固醇效果研究

目的:研究两种植物甾醇纳米粒对高血脂小鼠的降胆固醇效果。方法:建立高血脂小鼠模型,随后将小鼠分为8组:正常组、高脂模型组、阳性对照组、植物甾醇(PS)组、植物甾醇纳米粒(PNP)组、空白纳米粒(NP)组、壳聚糖修饰植物甾醇纳米粒(CS-PNP)组、空白壳聚糖修饰纳米粒(CS-NP)组,连续干预4周。测定小鼠体重、采食量变化,脏器指数、血清指标、肝脂含量以及粪便中甾醇含量,并进行肝脏切片观察。结果:各给药组对小鼠采食量及体重无显著影响(p>0.05);PNP和CS-PNP组小鼠肝系数较高脂组显著降低(p<0.05),心系数、脾系数显著升高(p<0.05),对肺系数和肾系数无显著影响(p>0.05);PNP和CS-PNP组可显著降低小鼠血脂中TG、TC和LDL-C水平,升高HDL-C水平,同时显著降低肝脏中TG与TC含量(p<0.05);PNP和CS-PNP组能有效治疗小鼠的脂肪肝。结论:PNP和CS-PNP对膳食诱导的高血脂小鼠有较好的降胆固醇效果。     

植物甾醇酯对高脂血症小鼠的降血脂作用研究

对不同剂量的植物甾醇酯对高脂血症小鼠血脂水平的影响进行研究。饲喂高脂饲料建立小鼠高脂血症模型,然后对小鼠饲喂高脂饲料的同时灌胃不同剂量(50、75、100、125、150mg/(kg ·d))的植物甾醇酯。结果表明：与高脂模型组比较,植物甾醇酯会明显降低血清总胆固醇(TC)和低密度脂蛋白胆固醇(LDL-C)水平,增加高密度脂蛋白胆固醇与低密度脂蛋白胆固醇比值(HDL-C/LDL-C)和HDL-C/TC值,降低动脉硬化指数,对甘油三酯(TG)水平却无明显影响;植物甾醇酯具有调节血脂的作用,高于75mg/(kg ·d)植物甾醇酯可显著降低(P＜0.05)高血脂模型小鼠的血脂水平。     

植物甾醇酯和葛根素联合使用对高脂血症小鼠降血脂作用研究

研究植物甾醇酯和葛根素联合使用时对高脂血症小鼠降血脂的作用。昆明种小鼠饲喂高脂饲料,建立小鼠高脂血症模型。将建模成功的小鼠,按总胆固醇及体重分为5组,即高血脂模型组、植物甾醇酯组、葛根素组、植物甾醇酯和葛根素联合组、辛伐他丁组。对小鼠饲喂高脂饲料的同时连续灌胃5周不同剂量的植物甾醇酯、葛根素、辛伐他丁。实验结束后测定各组小鼠的体重,动脉硬化指数(AI),肝脏系数(HI),血清中的甘油三酯(TG)、总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)。结果表明:与高血脂模型组相比,植物甾醇酯和葛根素联合组TG、TC、LDL-C、AI、HI显著降低(P0.05),分别下降24.22%、28.01%、21.17%、67.68%、15.34%,HDL-C显著升高45.51%(P0.05);植物甾醇酯和葛根素联合使用比单独使用时能降低高血脂小鼠TG、TC、LDL-C、AI、HI,其中部分差异显著。说明植物甾醇酯和葛根素联合使用时具有降低血脂作用,而且比两者单独使用时具有更好的治疗高脂血症作用。     

香椿叶提取物对高血脂症小鼠脂质代谢的调节作用及抗氧化功能的影响

为探讨香椿叶提取物(TLE)对高脂血症小鼠脂质代谢的调节作用及抗氧化功能,以高脂饲料喂养雄性Wistar小鼠,建立高脂血症模型,观察TLE对小鼠血脂和肝脂质水平、血清和肝脏抗氧化功能的影响及肝指数的变化情况.结果表明TLE能显著降低高脂血症小鼠血清总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)水平,升高高密度脂蛋白胆固醇(HDL-C)的浓度,同时LDL/HDL水平亦显著下降;TLE能降低小鼠肝指数和肝脏TC及TG含量,提高血清总抗氧化力(FARP)水平,改善血清和肝脏超氧化物歧化酶(SOD)及血清谷胱甘肽过氧化物酶(GSH-Px)的活性,并能降低血清和肝脏MDA含量.因此TLE具有调节脂质代谢和增强抗氧化功能的作用,可减少高脂膳食导致的氧化损伤.     

燕麦馒头对高脂小鼠降血脂、抗氧化及保护肝脏作用的研究

研究燕麦发酵前后对高血脂小鼠血脂、抗氧化以及肝保护作用。雄性KM小鼠随机分为4组,每组12只,分别为正常对照组、高脂模型组、燕麦面条组、燕麦馒头组。6周后检测血清、肝脏中总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)水平及抗氧化丙二醛(MDA)、超氧化物歧化酶(SOD)、还原谷胱甘肽(GSH)指标,同时观察肝组织损伤变化情况。燕麦馒头组小鼠血清及肝脏中TG、TC、LDL-C水平均显著(P0.05)或极显著(P0.01)降低,HDL-C水平显著升高(P0.05);与高脂模型组比较,肝脏中TC、TG、LDL-C分别下降46.43%、50%、45.95%,HDL-C上升32.08%,血清中TC、TG、LDL-C分别下降19.59%、30.81%、17.45%,HDL-C上升24.34%,燕麦馒头降低血脂效果在肝脏中更加明显。燕麦馒头组和燕麦面条组小鼠肝脏、血清中的SOD和GSH活性均显著(P0.05)或极显著(P0.01)升高,MDA含量显著(p0.05)或极显著(P0.01)降低,说明燕麦发酵前后均增强抗氧化能力,且发酵后抗氧化能力明显高于发酵前。病理学检测结果显示燕麦馒头具有减少高脂血症小鼠肝脏中脂质沉积的作用。燕麦发酵后对高血脂小鼠有显著降低血脂、抗氧化及降低肝损伤作用。     

紫荆花红色素对模型动物血糖和血脂的影响研究

目的:观察紫荆花红色素对模型动物血糖和血脂水平的影响.方法:腹腔注射四氧嘧啶制备糖尿病小鼠模型,灌胃高脂乳剂制备高脂血症大鼠模型.将动物分成对照和高、中、低不同剂量组,按动物体重给药实验.强生血糖仪测定小鼠血糖浓度,试剂盒法测定血清TC、TG、HDL-C和LDL-C等生化指标.结果:四氧嘧啶致糖尿病小鼠造模成功,紫荆花红色素各剂量组使小鼠体重显著增大,高、中剂量组使血糖显著降低(p＜0.01).高脂乳剂致SD大鼠高脂血症造模成功,红色素各剂量组均使大鼠血清TC和LDL-C水平显著降低,中、高组显著降低TG水平和LDL-C/HDL-C比值(p＜0.05),高剂量组对HDL-C水平具有明显的调节作用(p＜0.01).结论:紫荆花红色素对四氧嘧啶致糖尿病小鼠血糖水平和高脂血症大鼠的血脂水平有显著调节作用.     

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.     

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.