阿里红多糖组分对RAW264.7巨噬细胞免疫功能的影响

目的研究阿里红多糖(Fomes Officinals polysaccharide,FOPS)及其组分FOPS-a、FOPS-b对RAW264.7巨噬细胞的免疫调节作用。方法以小鼠RAW264.7巨噬细胞为研究对象,不同浓度(50~1600μg/m L)FOPS、FOPS-a、FOPS-b干预后,用cck-8试剂盒测定细胞活力,中性红法测定其吞噬活性,NO试剂盒测定NO的含量,ELISA试剂盒测定TNF-α和IL-1β释放能力。结果 FOPS、FOPS-a、FOPS-b在一定的浓度范围内可以提高RAW264.7巨噬细胞的增殖活性、吞噬活性、一氧化氮以及TNF-α、IL-1β的释放量。结论 FOPS、FOPS-a、FOPS-b一定浓度范围内具有良好的增强RAW264.7巨噬细胞免疫功能的作用。     

紫球藻多糖免疫调节作用初步探究

探究紫球藻多糖对体外免疫细胞免疫功能的影响。用不同浓度的紫球藻多糖刺激小鼠腹腔巨噬细胞RAW264.7,用脂多糖(lipopolysaccharide,LPS)作为阳性对照,格里斯试剂(Griess)法检测细胞上清液中一氧化氮(nitric oxide,NO)释放量,噻唑蓝(3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide,thiazolyl blue tetrazolium bromide,MTT)法测定紫球藻多糖对RAW264.7细胞活力的影响,中性红法检测细胞的吞噬能力。采用酶联免疫吸附法(enzyme-linked immunosorbent,ELISA)检测细胞上清液中肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)与白细胞介素-6(interleukin-6,IL-6)的分泌情况。结果表明:不同浓度紫球藻多糖能够促进NO的释放,增强巨噬细胞对中性红的吞噬能力,刺激TNF-α与IL-6的释放。紫球藻多糖浓度在12.5μg/mL～400μg/mL的范围内,对细胞无毒性。试验结果初步证明:紫球藻多糖对巨噬细胞RAW264.7具有免疫调节作用,这将为进一步开发应用紫球藻多糖奠定基础。     

阿魏侧耳胞外多糖对小鼠巨噬细胞的激活作用

利用巨噬细胞体外培养体系,研究阿魏侧耳胞外多糖对小鼠巨噬细胞的激活作用。无菌获得小鼠腹腔巨噬细胞,中性红吞噬实验检测细胞吞噬活性;荧光探针标记和Griess反应分别检测细胞内外NO的含量,酶联免疫吸附法检测细胞内一氧化氮合成酶(NOS)、培养上清中肿瘤坏死因子-α(TNF-α)、白细胞介素-1(IL-1)和白细胞介素12(IL-12)的含量。结果表明,与空白组相比,25~200 mg/L阿魏侧耳胞外多糖可显著增强巨噬细胞的吞噬活性(p0.05),增加细胞因子IL-1(p0.05)和IL-12(p0.05)的分泌量;50~200 mg/L阿魏侧耳胞外多糖可显著提高细胞NOS(p0.05)和NO(p0.05)的含量以及TNF-α的分泌量(p0.05)。因此,一定浓度阿魏侧耳胞外多糖对体外培养的小鼠巨噬细胞具有激活作用。     

纳豆菌糖肽对RAW264.7巨噬细胞的免疫调节作用

为考察纳豆菌糖肽(BNGP)对正常状态及脂多糖(LPS)激活状态巨噬细胞的免疫调节作用,本文用不同浓度的BNGP单独处理或LPS和不同浓度的BNGP共同处理RAW264.7巨噬细胞,采用噻唑蓝(MTT)比色法检测细胞增殖作用,中性红吞噬试验检测吞噬能力,Griess试剂检测细胞培养上清液中NO含量,酶联免疫分析法(ELISA)检测细胞培养上清液中细胞因子(IL-1β、TNF-α)、促炎介质(PGE2)含量,Western Blot检测COX-2和i NOS蛋白表达水平。试验结果表明:BNGP在62.5~500μg/m L浓度范围内能提高正常状态的RAW264.7巨噬细胞的代谢活力,增加NO、IL-1β、TNF-α、PGE2的分泌量,提高COX-2和i NOS的表达量,高浓度(125μg/m L)能增强巨噬细胞的吞噬能力;当细胞处于LPS激活状态时,BNGP在62.5~500μg/m L浓度范围内能抑制IL-1β、TNF-α、PGE2的分泌,浓度为500μg/m L时可抑制NO的产生及i NOS的表达,高浓度(125μg/m L)则能下调COX-2的表达。     

乌鸡肽免疫调节作用的研究

对乌鸡肽的基本理化指标进行了测定,并对其免疫调节活性进行研究。应用WST-8法检测不同浓度乌鸡肽对小鼠脾淋巴细胞增殖的影响,以吞噬能力和NO的生成量为指标评价乌鸡肽对小鼠腹腔巨噬细胞活力的影响。乌鸡肽主要含有相对分子量低于1000U的短肽,对ConA诱导的T-淋巴细胞增殖和LPS诱导的B-淋巴细胞增殖均有显著的促进作用。浓度为100μg/mL时,显著促进小鼠腹腔巨噬细胞吞噬能中性红的能力和NO生成。乌鸡肽具有较好的增强免疫调节的能力。     

毛蕊花糖对巨噬细胞RAW264.7免疫调节作用的研究

目的：明确毛蕊花糖对巨噬细胞RAW264.7免疫功能的调节作用。方法：分别以质量浓度25、50、100、200、400μg/mL的毛蕊花糖对RAW264.7巨噬细胞进行培养,以10μg/mL的脂多糖(LPS)为阳性对照组、不加任何样品的培养基为空白对照组。通过噻唑蓝(MTT)实验、吞噬中性红实验、NO释放量测定及酶联免疫吸附法测定细胞因子(IL-6、IL-1β、IFN-α、IFN-γ)的分泌量,评价毛蕊花糖的免疫调节作用。结果：质量浓度为25～400μg/mL的毛蕊花糖对巨噬细胞RAW264.7作用24h后,可显著提高巨噬细胞的增殖活性、吞噬活性、NO释放量以及细胞因子的分泌水平,并且毛蕊花糖溶液质量浓度为200μg/mL时效果最好。结论：毛蕊花糖对小鼠腹腔巨噬细胞系RAW264.7具有免疫调节活性,是一种良好的免疫增强剂。     

基于巨噬细胞模型的竹荪多糖的免疫功能

为探索竹荪多糖(DI)对巨噬细胞RAW264.7免疫功能的影响,分别采用四唑氮蓝(MTT)法、中性红法、Griess法、ELISA法,检测DI对巨噬细胞增殖、吞噬活性、一氧化氮(NO)和白细胞介素1(IL-1)、白细胞介素6(IL-6)、α肿瘤坏死因子(TNF-α)分泌量的影响;运用反转录PCR(RT-PCR)检测i NOS和IL-1、IL-6、TNF-α的m RNA表达量的变化。结果表明,在25~200μg/m L质量浓度范围内,DI能够明显促进巨噬细胞增殖,增强其吞噬活性。同时,DI能够增强巨噬细胞分泌NO、IL-1、IL-6、TNF-α的能力,且明显提高i NOS、IL-1、IL-6、TNF-αm RNA的表达水平。因此,竹荪多糖对巨噬细胞RAW264.7具有免疫刺激作用。     

大连紫海胆棘壳色素的体外抗炎和免疫调节作用

目的:研究大连紫海胆棘壳色素的体外免疫调节和抗炎活性。方法:以LPS(细菌脂多糖)为炎症诱导物,研究棘壳色素对RAW264.7细胞分泌多种炎症因子的影响。分别采用MTT法及中性红吞噬法研究棘壳色素对脾淋巴细胞增殖及腹腔巨噬细胞吞噬功能的影响。采用补体结合法考察棘壳色素对补体活性的影响。结果:棘壳色素可显著抑制LPS刺激后RAW264.7细胞合成分泌NO(作用质量浓度5~30μg/m L)、IL-6、TNF-α(作用质量浓度60μg/m L)、PGE2及6-KETO-PGF1α(作用质量浓度10~60μg/m L)的水平,但不影响IL-4的分泌水平。20,50μg/m L的棘壳色素均可促进脾淋巴细胞的增殖,30,60μg/m L的棘壳色素可显著增强腹腔巨噬细胞的吞噬活性,1~500μg/m L的棘壳色素还可显著抑制补体活性。结论:海胆棘壳色素可在功能性产品开发方面具有一定应用潜力。     

树蝴蝶多糖的免疫调节活性研究

本文采用超声波辅助水提、乙醇沉淀、DEAE-52纤维素阴离子交换层析法分离纯化得到从树蝴蝶原料中提取的中性多糖LKY-I。以不同浓度的多糖为原料,研究了LKY-I的体外免疫调节活性。结果表明,LKY-I在125~500μg/mL浓度范围内对RAW 264.7细胞无明显毒性。LKY-I可显著增强巨噬细胞吞噬中性红的能力,当多糖浓度为500μg/mL时,吸光度值可达到1.39,显著高于阳性对照组LPS。LKY-I可促进巨噬细胞RAW 264.7分泌NO,最大分泌量可达55.42±1.79μM;与正常对照组相比,LKY-I促进巨噬细胞分泌IL-6、TNF-α细胞因子,分泌量分别增加了102.3%和289.5%。在125~500μg/mL浓度范围内,LKY-I可显著提高i NOS、IL-6及TNF-α基因的表达。LKY-I协同LPS和Con A能显著促进小鼠脾淋巴细胞的增殖。研究结果表明,LKY-I多糖具有良好的体外免疫调节活性,可以作为一种有益健康的成分应用到食品工业中。     

树蝴蝶多糖的免疫调节活性研究（英文）

本文采用超声波辅助水提、乙醇沉淀、DEAE-52纤维素阴离子交换层析法分离纯化得到从树蝴蝶原料中提取的中性多糖LKY-I。以不同浓度的多糖为原料,研究了LKY-I的体外免疫调节活性。结果表明,LKY-I在125~500μg/mL浓度范围内对RAW 264.7细胞无明显毒性。LKY-I可显著增强巨噬细胞吞噬中性红的能力,当多糖浓度为500μg/mL时,吸光度值可达到1.39,显著高于阳性对照组LPS。LKY-I可促进巨噬细胞RAW 264.7分泌NO,最大分泌量可达55.42±1.79μM;与正常对照组相比,LKY-I促进巨噬细胞分泌IL-6、TNF-α细胞因子,分泌量分别增加了102.3%和289.5%。在125~500μg/mL浓度范围内,LKY-I可显著提高i NOS、IL-6及TNF-α基因的表达。LKY-I协同LPS和Con A能显著促进小鼠脾淋巴细胞的增殖。研究结果表明,LKY-I多糖具有良好的体外免疫调节活性,可以作为一种有益健康的成分应用到食品工业中。     

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