糯玉米籽粒水分变化规律的研究

适时采收后的糯玉米籽粒水分含量变化对其加工保鲜品质影响很大。以4个糯玉米品种为试材,研究了低温贮藏、室温贮藏、带苞叶贮藏和不带苞叶贮藏4个处理条件下的鲜籽粒水分变化规律。结果认为:四种处理情况下影响糯玉米籽粒含水率随时间变化大小因素的排列顺序依次为:室温>不带苞叶>带苞叶>低温。     

钙制剂涂膜黄瓜保鲜的研究

以钙制剂对黄瓜进行涂膜处理,于室温下贮藏,测定了在贮藏过程中黄瓜的失重率、叶绿素、Vc、呼吸强度以及硬度的变化。实验结果表明,以6倍稀释液浓度涂膜黄瓜,其保鲜效果较好,可以有效延长黄瓜的货架期。     

钙制剂涂膜黄瓜保鲜的研究

以钙制剂对黄瓜进行涂膜处理,于室温下贮藏,测定了在贮藏过程中黄瓜的失重率、叶绿素、Vc、呼吸强度以及硬度的变化。实验结果表明,以6倍稀释液浓度涂膜黄瓜,其保鲜效果较好,可以有效延长黄瓜的货架期。      

壳聚糖涂膜对鲜切菠萝蜜的保鲜作用

本文通过壳聚糖对鲜切菠萝蜜进行涂膜处理,研究保质期内还原糖含量、总酸含量、水分含量的变化,分析壳聚糖涂膜对干苞和湿苞菠萝蜜的保鲜效果。结果表明：在3±1℃的条件下贮藏15 d,涂膜鲜切菠萝蜜的还原糖的变化速率较小,均小于未处理组。涂膜湿苞和干苞的还原糖含量分别降低了3.58%和3.81%,而未处理组还原糖含量降低了4.77%。贮藏到第6 d时,涂膜处理的湿苞和干苞含水量都达到最低值,对照组的含水量为65.96%,湿苞和干苞的含水量分别为72.60%和73.81%,总酸量分别降低了0.13%和0.15%,未处理组总酸含量降低了0.23%。壳聚糖涂膜处理能够延缓菠萝蜜的后熟,对湿苞的保鲜效果优于对干苞的保鲜效果。     

油豆角的冰温贮藏的研究

本试验研究了塑料小包装的油豆角在室温、冰温、以及经冰点调节剂处理后的冰温贮藏过程中的生理生化变化,探讨了油豆角在贮藏过程中可溶性固形物含量、总糖含量、酸含量、呼吸强度、电导率的变化,并分析了各种变化的原因及相互间的联系;试验结果表明冰温贮藏要比室温贮藏保质期延长15天左右,而山梨糖醇是效果较好的冰点调节剂,同时小包装气调贮藏能够更有效地抑制油豆角在贮藏过程中糖分和水分的消耗,可更大限度延长油豆角的贮藏时间.     

浅谈新疆特色果品贮藏保鲜技术的研究与应用

本文主要针对新疆特色果品葡萄、香梨、杏子、石榴、鲜枣的贮藏方法与保鲜技术做一概述。贮藏方法主要包括:冷冻贮藏、MA 自发气调结合低温贮藏、湿冷贮藏、减压贮藏、冷藏等;防腐保鲜的处理方法主要包括:辐照、臭氧处理、热激处理、钙处理、杀菌剂与保鲜剂的应用、涂膜贮藏保鲜技术等。     

3种贮藏方式对苹果柚采后生理及贮藏效果的影响

为研究室温贮藏、简易气调贮藏和涂膜贮藏对苹果柚采后生理及贮藏效果的影响,检测3种不同贮藏方式对苹果柚失重率、可溶性固形物、可溶性糖、可滴定酸、维生素C、丙二醛含量和过氧化氢酶活性的影响,分析贮藏期间这些指标的变化。与室温贮藏相比,简易气调贮藏和涂膜贮藏能减少失重、延缓可滴定酸和维生素C含量的下降、降低丙二醛含量和提高过氧化氢酶活性。综合检测的各项指标,涂膜贮藏方式对苹果柚的贮藏效果要优于室温贮藏和简易气调贮藏,这表明涂膜贮藏更适合苹果柚的长期贮藏。     

壳聚糖精油复合涂膜对鲜切山药保鲜的应用

研究壳聚糖结合2种植物精油复合涂膜对鲜切山药在低温贮藏期间的保鲜效果。分别采用0.3%的柠檬精油、肉桂精油和二者1:1混合精油与壳聚糖乳液复配,同时采用纯壳聚糖乳液和水处理作为对照,考察不同处理方式对鲜切山药失重率、腐烂率、Vc含量、总糖含量、多酚氧化酶(PPO)和褐变强度(BD)的影响。结果表明,不同组分的精油复合壳聚糖涂膜处理均能够有效降低山药水分、Vc等成分的流失,延缓鲜切山药的褐变强度和PPO活性。壳聚糖复合2种精油涂膜处理能够减缓鲜切山药营养成分的流失,从而延长其保存期。     

不同方式贮藏对拉萨刺梨品质的影响

本研究以拉萨地区刺梨果实为试材,分别采用室温、室温＋气调袋、低温（（1.0±0.5）℃）和低温 （（1.0±0.5）℃）＋气调袋4 种方式贮藏,测定贮藏过程中硬度、可溶性固形物质量分数、可滴定酸质量分数、 VC含量、超氧化物歧化酶（superoxide dismutase,SOD）活力、质量损失率、腐烂率的变化,研究不同方式贮藏对 刺梨品质的影响。结果表明：在贮藏6 d时,室温、室温＋气调袋、低温和低温＋气调袋贮藏的刺梨VC含量分别下 降了69.55%、25.91%、41.93%和14.47%,SOD活力分别下降了47.99%、24.96%、33.98%和14.32%,在贮藏6 d时仅 室温＋气调袋处理的刺梨有腐烂现象出现,腐烂率为1.78%;与其他贮藏方式相比,低温＋气调袋贮藏组果实的硬 度、可溶性固形物质量分数、可滴定酸质量分数、质量损失率等下降明显变缓,贮藏综合品质最好。     

蒲菜气调保鲜贮藏技术研究

研究气调包装对贮藏过程中的蒲菜的营养成分(Vc、粗纤维、总酸、总糖等)的含量变化及外观变化的影响,提出适合蒲菜气调保鲜的包装材料和气体配比。结果表明:气体比例为5%O2∶10%CO2∶85%N2,选用T5保鲜袋,在低温下可保鲜3周,可比对照组延长保鲜期1周。     

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