ESL奶加工技术研究

通过陶瓷膜微滤除菌技术，低强度杀菌技术及无菌灌装技术的结合，对ESL奶的加工技术进行了研究。结果表明．梯度膜(1．4μm)除菌除芽孢效果显著，截留率分别达到99.94％和99.86％，采用75-95℃，4～15s的任意温度时间组合，成品奶中消毒效果彻底．无菌灌装后，产品在7℃下保质期可达30d。     

畜禽肌肉、内脏及虾中磺胺二甲嘧啶残留量的检测技术研究

为了快速、简便、灵敏地监测畜禽肌肉、内脏及虾中的磺胺二甲嘧啶残留，建立了高效液相色谱法快速检测技术。动物组织中的磺胺二甲嘧啶用二氯甲烷超声提取3次，提取液与2％硫酸钠水溶液进行液一液分配，下层有机相经脱水、浓缩后用0．02mol／L盐酸溶解浓缩瓶中残留物，以正己烷去除脂溶性杂质，经0．45μm滤膜过滤后供HPLC测定。结果表明本方法的线性范围为0．2～3．0μg/mL，方法的最低检出浓度为2．1μg/kg，在50～100μg/kg的加标水平，方法平均回收率为76．6％～93．6％，相对标准偏差为4．4％～8．4％。该方法适用范围广，回收率高，检测限低，简单易行，易于在基层推广应用。     

轴承旋流强化的管内污垢自动清洗扭带技术

冷饮与速冻工业的水冷器大多为列管式结构。实际运行的管内冷却水流速一般为0．5～1．0m／s，易结垢，效率低。通过强化理论分析和结构设计的优化试验，研究成功了旋流轴承强化塑料扭带自动清洗技术，能够使现有光滑扭带的清洗力矩成倍增加；可以使水冷管长度为2m、4m、6m的水冷器对管内冷却水的流速要求由原先的1m／s以上，分别下降至0．4m／s、0．5m／s、0．6m／s，从而使多数水冷器可以直接应用管内污垢自转塑料扭带自动清洗技术，并且流体的阻力不大，结构简单，便于推广应用。     

SPME/GC联用测定芥末油中辛辣物质异硫氰酸烯丙酯的研究

研究使用顶空固相微萃取(SPME)技术与气相色谱(GC)联用测定芥末油中辛辣物质异硫氰酸烯丙酯。采用正交设计研究了萃取温度、搅拌速度、萃取时间、解吸时间四因素四水平对萃取效率的影响，结果表明，影响萃取效率的主次因素依次为萃取温度、搅拌程度、萃取时间、解吸时间；以萃取温度40℃、搅拌程度900r／min、萃取时间30min、解吸时间5min为最理想。该方法在含异硫氰酸烯丙酯0．02μL～0．60μL范围内线性良好，相关系数r=0．9964；对芥末油中加标异硫氰酸烯丙酯0．10μL／L、0．20μL／L、0．30μL／L，回收率分别为91．18％、94．36％、106．4％，相对标准偏差分别为2．32％、1．99％和4．27％；最小检出限为0．0056μL／L。     

大米中黄曲霉毒素B1的提取方法优化

通过ELISA检测，对多种溶剂提取大米中黄曲霉毒素B1的方法进行了优化，结果显示对于不同污染程度的大米样品，50％丙酮，水溶液和50％甲醇，水溶液提取效率最高，0．1、1、10μg／kg三个浓度水平的加标回收率为80．4％～140％，方法的重复性和稳定性很好，相对标准偏差2．99％-9．61％。     

牛奶微滤除菌技术研究

在均一孔径膜微滤系统的基础上，通过梯度膜切向流反向脉冲微滤系统的构建，研究了梯度膜用于牛奶微滤除菌的效果及其可行参数。结果证明，1．4μm孔径梯度膜对脱脂乳成分几乎没有截留，对细菌和芽孢高效截留，截留率分别达到99．94％和99．86％，陶瓷膜系统易于清洗，消毒方法简单彻底，在乳品工业中有着广阔的应用前景。     

适用于食品工业中的蔗糖-葡萄糖双功能生物传感分析仪的研究

由固定化蔗糖转化酶（INV），葡萄糖变旋酶（MUT）及葡萄糖氧化酶（GOD）的复合酶膜组成的过氧化氢双电极系统，可同时测定样品中蔗糖和葡萄糖的含量，蔗糖电极的葡萄糖干扰用差分法消除。每次进样量25μl，响应时间30s，蔗糖在0－400mg/dl，葡萄糖在0－200mg/dl范围内具有良了的线性关系，连续测定20次蔗糖和葡萄糖的变异系统分别为1．13％和1．05％。蔗糖测定回收率为99．62％－100．97％，蔗糖酶膜使用寿命半个月。     

固相萃取气相色谱-质谱联用法测定动物组织中的莱克多巴胺

通过液液分配和固相萃取提取、净化动物组织中添加的莱克多巴胺，TMS衍生化试剂BSTFA（N，O-双（三甲基硅烷基）三氟乙酰胺）衍生化，气相色谱-质谱联用（选择离子模式，选择离子为m/z163、m／z192、m／z234、m／z250）对衍生物检测分析，确定了动物组织中莱克多巴胺的定性、定量分析方法，该法检出限为0．5μg／L，衍生物的峰面积与样品浓度在1～1000μg／L范围内呈良好的线性关系，线性回归系数为0．9998。不同组织中不蚓莱克多巴胺加入量的加标回收率分别为：肝脏70．2％-75．4％，脂肪71．2％-84．7％，肾脏72．8％-80．9％，肌肉75．2％-86．4％；相对标准偏差为1．8％-5．6％。     

气相色谱法测定全氟辛磺酸化合物

采用快速溶剂萃取法，用甲苯、甲醇提取待测物，利用气相色谱法进行测定，外标法定量，建立了纺织品中三种全氟辛烷基磺酸化合物（PF0s）的检测方法。该方法的最低检出限、线性范围和回收率分别为：全氟辛磺酸6．51tw：／kg、13．0～208．3彬蚝和77．35％～111．60％；N-乙基全氟辛磺酸胺1.28μg／kg、1.6～80．0μg／kg和83．02％～113．88％；全氟辛磺酰氟0．25tμg／kg、1．2～98．5μg／kg和89.02％～104.67％。     

双水相系统中酶法水解明胶制取氨基酸的研究

在PEG-盐双水相系统中，进行了蛋白酶催化明胶水解制取混合氨基酸的研究。双水相系统组成为20％PEG1540、10％磷酸钾盐、pH7．5时，加入3％碱性蛋白酶发酵液和35％明胶，45℃下水解10h，转化率达到83．2％。酶分配于顶相，水解产物分配于底相，混合氨基酸的总收率为76．7％。水解产物中混合氨基酸由13种氮基酸组成，其中7种为必须氨基酸。     

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