1-(5-溴-2-羟基苯基)乙酮苯甲酰腙的合成及晶体结构

由1-(5-溴-2-羟基苯基)乙酮和苯甲酰肼通过缩合反应,合成新的芳香酰腙化合物:1-(5-溴-2-羟基苯基)乙酮苯甲酰腙.通过X射线单晶衍射对该化合物进行晶体结构的表征.研究表明,该酰腙为单斜晶系,空间群为P2(1)/n,晶胞学数据a=0.737 61(15)nm,α=90°,b=2.827 0(6)nm,β=116.928(12)°,c=0.860 89(13)nm,γ=90°.V=1.600 5(5)nm3,Z=4,μ=2.570mm-1,Dc=1.383mg/m3,F(000)=672,R1=0.067 6[I2σ(I)],wR2=0.187 7.     

2,5-二羟基对苯二甲酸Eu(Ⅲ)配位聚合物的合成与表征

以水/乙腈为溶剂,采用溶剂热法合成2,5-二羟基对苯二甲酸Eu(Ⅲ)配合物{[Eu2(H2-DHBDC)3(H2O)4](H2O)}n(其中H2-DHBDC表示2,5-二羟基对苯二甲酸).利用X-射线单晶衍射(SCXRD)、红外光谱(FTIR)、元素分析(EA)、热重分析(TG)和荧光分光光度法(FS)等对其晶体结构和荧光性质进行分析与表征.结果表明,该晶体属于三斜晶系,P-1空间群,晶胞参数a=0.949 25(6)nm,b=1.029 9(7)nm,c=1.056 5(7)nm,α=98.164(10)°,β=111.352(10)°,γ=111.969(10)°,V=835.65(10)nm3,Z=1.且9个氧原子在铕离子周围形成一个三帽三棱柱配位环境,Eu(Ⅲ)通过配体之间的连接形成了具有一定孔道的三维结构;荧光分析结果表明,配合物具有较好的荧光性质.     

亚苄基丙酮苯甲酰腙Zn（Ⅱ）配合物的合成与晶体结构

采用亚苄基丙酮苯甲酰腙（HL）配体与Zn（NO3）2溶液进行反应,得到配合物Zn（LPy）2,并培养出其晶体,然后通过FTIR、热分析及X-射线单晶衍射等手段对其进行表征．X-射线单晶衍射结果表明,配合物Zn（LPy）2分子最小,不对称独立单元化学式为C44H40ZnN6O2,为扭曲的四角双锥构型,属于P-1空间群,晶胞参数a=1．07563（18）nm,b=1．3579（2）nm,c=1．4402（2）nm;α=83．503（3）°,β=84．282（3）°,γ=66．818（3）°,V=1．9178（5）nm^3,Z=2,F（000）=788,R1=0．0496．使用滤纸片琼脂扩散法测定了配体和配合物对大肠杆菌、金黄色葡萄球菌和绿脓杆菌等3种细菌的抑菌活性．抑菌实验结果表明,配体（HL）和配合物均有较好抑菌活性．     

2,5-二羟基对苯二甲酸Eu(Ⅲ)配位聚合物的合成与表征

以水/乙腈为溶剂,采用溶剂热法合成2,5-二羟基对苯二甲酸Eu(Ⅲ)配合物{[Eu_2(H_2-DHBDC)_3(H_2O)_4](H_2O)}n(其中H_2-DHBDC表示2,5-二羟基对苯二甲酸).利用X-射线单晶衍射(SCXRD)、红外光谱(FTIR)、元素分析(EA)、热重分析(TG)和荧光分光光度法(FS)等对其晶体结构和荧光性质进行分析与表征.结果表明,该晶体属于三斜晶系,P-1空间群,晶胞参数a=0.949 25(6)nm,b=1.029 9(7)nm,c=1.056 5(7)nm,α=98.164(10)°,β=111.352(10)°,γ=111.969(10)°,V=835.65(10)nm~3,Z=1.且9个氧原子在铕离子周围形成一个三帽三棱柱配位环境,Eu(Ⅲ)通过配体之间的连接形成了具有一定孔道的三维结构;荧光分析结果表明,配合物具有较好的荧光性质.     

无机分子筛材料[CoNa6(SO4)4(H2O)2]n 的合成、晶体结构和量化研究

硫酸钴溶液在二茂铁单甲酸钠存在下,形成了一个稳定的三维多孔无机分子筛材料[CoNa6(SO4)4(H2O)2]n.单晶结构解析表明该晶体属于三斜晶系,空间群为P(-1),晶胞参数为:a=0.60483(12)nm,b=0.68280(14)n m,c=1.0094(2)nm;α=109.13(3)°,β=92.57(3)°,γ=105.53(3)°,R1=0.0352,wR2=0.0930.对此化合物的前线轨道研究发现,金属钠离子的引入对于化合物稳定性影响很大,这得到了Na-S键级较大的证明.量化研究进一步表明,对于研究化合物稳定性有很大贡献.     

钐-5-磺基水杨酸配合物的合成、晶体结构及光学性能

采用水溶剂热法合成出钐配合物Sm（SSA）（H2O）2·H2O,并通过元素分析、红外光谱、热重分析对其结构进行表征,利用紫外及荧光分光光度计研究配合物的光学性能,用X-射线单晶衍射仪测定配合物的晶体结构．结果表明,晶体属于单斜晶系,空间群为P2（1）／n;晶胞参数a=0．88844（16）nm,b=0．89254（16）nm,c=1．4366（3）nm,a=90．00°,β-100．810（2）°,）,γ=90．00°,Z=4,V=1．1190（3）nm^3（CCDCNo．：875346）．中心金属离子Sm与周围的8个氧原子形成了四方反棱柱体的几何构型．     

无机分子筛材料[CoNa6(SO4)4(H2O)2]n 的合成、晶体结构和量化研究

硫酸钴溶液在二茂铁单甲酸钠存在下,形成了一个稳定的三维多孔无机分子筛材料[CoNa6(SO4)4(H2O)2]n。单晶结构解析表明该晶体属于三斜晶系,空间群为Pī,晶胞参数为:a=0.60483(12)nm,b=0.68280(14)n m,c=1.0094(2)nm;α=109.13(3)°,β=92.57(3)°,γ=105.53(3),°R1=0.0352,wR2=0.0930。对此化合物的前线轨道研究发现,金属钠离子的引入对于化合物稳定性影响很大,这得到了Na-S键级较大的证明。量化研究进一步表明,对于研究化合物稳定性有很大贡献。     

以5-甲基间苯二甲酸为配体的Ni（Ⅱ）配合物合成及晶体结构

以5-甲基间苯二甲酸为配体与吡啶、硝酸镍反应,水热合成制得配合物5-甲基间苯二甲酸吡啶镍（Ⅱ）,并培养成单晶.通过元素分析和X射线单晶衍射对其结构进行了表征,该配合物晶体属单斜晶系,空间群为C2/c,晶胞参数a=1.961 6（6）nm,b=1.609 3（5）nm,c=1.475 6（5）nm,β=111.836（4）°,Z=8,V=4.324（2）nm3,Dc=1.457mg/m3,F（000）=1 968,R1=0.081 7[I〉2sigma（I）],wR2=0.1854（all data）,GOF=3.015.测试结果表明,在配合物中镍原子处于六配位的配位环境,配位原子分别来自1个配体5-甲基间苯二甲酸中的3个O原子和3个吡啶环上的N原子.Ni2＋经配体桥联形成一维波浪状链.     

1-（2，6-二氯-4-三氟甲基苯基）-3-乙酰氨基-5-氨基吡唑及其合成及晶体结构

【摘要】2,6-二氯-4-三氟甲基苯胺经重氮化后,与2,3-二氰基丙酸乙酯反应,碱性关环得到中间体1-f2,6-二氯-4-三氟甲基苯基）-3-氰基-5-氨基吡唑（1）,1与双氧水在碱性条件下反应得到1的3-乙酰氨基化合物2。通过元素分析,红外光谱,核磁共振氢谱,核磁共振破谱等手段对其结构进行了表征。用x射线单晶衍射测定了化合物2的晶体结构。2属于单斜晶系,C2／c空间群,晶胞参数a=19．190（4）nm,b=14．458（3）nm,c=10,169（2）nm,α=90．00°,β=103．57（3）°,γ=90．00°,V=2742．6（9）nm^3,Z=8,R=0．0479,wR=0．1289°     

苯乙酮-2-羟基苯甲酰腙的合成与表征

以苯乙酮和2-羟基苯甲酰肼为原料,采用N,N-二苯基硫脲为催化剂,通过缩合反应合成新的酰腙化合物:苯乙酮-2-羟基苯甲酰腙.通过元素分析、红外光谱、热失重分析对其进行了表征.同时研究了催化剂用量与反应时间对酰腙收率的影响.结果表明,在回流条件下,催化剂N,N-二苯基硫脲用量为1.598 2g,反应6.0h时,酰腙收率可达到89.35%.     

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