离子排斥色谱法快速测定苯甲酸

本文探讨了用电导离子排斥色谱法测定饮料中作为防腐剂的苯甲酸，用ｍｍｏｌ．Ｌ＾－１硝酸为淋洗液，在Ｈ＾＋型阳离子交换树脂得到苯甲酸与饮料中其它组份的良好分离。甲酸测定的检出限为０．１ｍｇ．Ｌ＾－１相对标准偏差于２％，样品加标回收率为９７％－１０４％。对样品中需经过稀释即可直接进样，分析时间很短。     

山葡萄及其杂交品种组培脱毒技术的研究

１９９１－１９９５年，采用无病毒症状山葡萄及其２０个杂交后代的茎尖，进行培养。分化培养基为：ＭＳ附加ＮＡＡ０．０１－０．１ｍｇ／Ｌ、６－ＢＡ２ｍｇ／Ｌ、蔗糖３．０％、琼脂５．０％；生根培养基为：１／２ＭＳ附加ＩＢＡ０．２－０．４ｍｇ／Ｌ、蔗糖１．５％，     

功能性多糖影响硫胺素生物利用率的研究

功能性多糖因束缚作用而降低了硫胺素的利用率,其束 胺素的量随ＰＨ的升高而增大;在肠液ＰＨ条件下,羧甲基纤维素,蔗渣纤维束缚硫胺素的最大量分别为１１．０＊１０＾－２ｍｇ／ｇ,６．１＊１０＾－２ｍｇ／ｇ,最低浓度分别为０．０４２％,０．０１８％。     

关于Marcinkiewicz积分的一点注记

证明了当Ω∈Ｌ＾∞－Ｄｉｎｉ且∫ｓ＾ｎ－１Ω（ｘ）ｄσ（ｘ）＝０时,Ｍａｒｃｉｎｋｉｅｗｉｃｚ积分算子μΩ为Ｌ＾ｐ－有界（１〈Ｐ〈∞）及弱型Ｌ＾１－有界。     

某些药物对谷氨酸菌S9114生长速率的影响

本文研究了某些药物对谷氨酸菌生长速率的影响。结果表明，在种子培养基和生长培养基中同时添加适量的复合维生素溶液（约２００ｍｇ／Ｌ）或复合核苷酸溶液（约３０ｍｇ／Ｌ）对菌体生长有明显的促进作用；在种子培养基中添加适量（０．１－１０ｍｇ／Ｌ）的细胞生长纱Ａ，Ｄ，Ｋ等对菌体生长有较大促进作用，添加细胞生长素Ｂ，Ｇ，对生长促进作用不明显。     

Hg（Ⅱ）—KI—XO—TritonX—100多元配合物显色反应的研究和应用

在非离子表面活性剂ＴｒｉｔｏｎＸ－１００存在下，汞（Ⅱ）与碘化钾和二水相中形成稳定的多元配合物显色体系。该配合物在５３０ｎｍ处有最大的吸收峰，其摩尔吸光系数ε５３０＝１．６３×１０＾６Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。汞含量在０－８μｇ／２５ｍｌ范围内服从Ｂｅｅｒ定律，用该法测定乳制品、白酒等食品中痕量汞，结果令人满意。     

葡萄糖异构酶在秸秆发酵中的应用

利用葡萄糖异构酶对秸秆水解液中Ｄ－水糖进行异构化研究。试验结果表明，在８０℃，ｐＨ９．０，酶与底物的质量比为１：１２５，加入Ｍｇ＾２＋的浓度为０．１５ｍｏｌ／Ｌ，Ｃｏ＾２＋的浓度为０．０１ｍｏｌ／Ｌ，反应时间为４８ｈ条件下，可使木糖异构率达５８％以上。     

安徽茶叶中氟化物含量的分析

用充氧燃烧氟离子电极法测定安徽产不同品种、不同等级、不同季节和不同地区的茶叶中氟化物含量（ｍｇ／ｋｇ）８．３２－２０８．９１发现有显著性差异（Ｐ＜０．０１）。同时测定了安徽主要水源（长江、淮河、巢湖）自来水中含氟量（ｍｇ／Ｌ）０．１５－１．０３。并且采用不饮茶方式研究茶水中氟化物含量的变化。若以日均饮用８００ｍｌ安徽茶水估算，、人均摄氟量（ｍｇ／ｄａｙ）０．１２－０．６４之间。     

钝顶螺旋藻对锌和硒生物富集作用的研究

研究不同浓度锌和硒对钝顶螺旋藻生长及富集量的影响，结果表明，当硒浓度为２００ｍｇ／Ｌ，锌浓度为４ｍｇ／Ｌ时，螺旋藻富集能力最大，达到７５２．７μｇ／ｇ和３７１．２μｇ／ｇ，但在该浓度下，螺旋藻的生长速度、硝酸盐还原酶活性略低于不加锌硒（对照）。锌、硒浓度较低时，可促进螺旋藻的生长，加速藻细胞对锌、硒的生物转化过程的进行，高浓度则抑制生长。当硒浓度为７００ｍｇ／Ｌ，锌浓度为９ｍｇ／Ｌ，该藻死亡。     

Cu（Ⅱ）—甲基橙—CTMAB多元配合物显色反应的研究和应用

在非离子表面活性剂ＰＶＡ－ＯＰ存在下，铜（Ⅱ）与甲基橙和溴化十六烷基三安在水相中形成稳定的多元配合物显色体系，该配合物在５２０ｎｍ处有最大吸收峰，其摩尔吸光系数∑５２０＝８．６×１０＾４Ｌ．ｃｍ＾－１．ｍｏｌ＾－１。。铜含量在０－９μｇ／２５ｍｌ范围内服从Ｂｅｅｒ定律，用地测定莲子、麦片、豆奶等食品中的微量铜，结果满意。     

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