黑米饮料加工中酶解关键工艺研究

以黑米为原料,经过烘烤、粉碎、超声浸提等工艺处理后,对制备黑米原汁的酶解工艺进行研究,分别对黑米的液化和糖化进行单因素和正交实验,优选出最佳的黑米液化和糖化条件。试验表明:液化的最佳条件为酶浓度25 U/g,温度95℃,时间60 min;糖化的最佳条件为酶浓度300 U/g,温度60℃,酶解时间6 h。     

银杏茶饮料前处理工艺的研究

探讨银杏茶饮料生产中前处理工艺的最佳条件。以总黄酮含量为考察指标,通过正交试验,得到最佳浸提工艺条件:银杏茶∶水为1∶30、浸提温度90℃、浸提时间30min。最佳酶解工艺条件:酶用量0.2g/100mL、pH5.0、酶解温度45℃、酶解时间60min。     

果蔬复合重组肉干的加工工艺研究

对猪肉牛肉果蔬复合重组肉干配方和工艺进行了研究,经试验确定猪肉牛肉果蔬复合重组肉干的最佳配方为猪碎肉35%,牛碎肉25%,紫薯泥9%,山药泥9%,五香粉0.5%;最佳工艺为:TG酶150 U/g,酶解温度40℃,酶解时间60 min,烘烤温度95℃,烘烤时间20 min。     

采用烘烤酶解方法生产枣汁饮料

以山西大枣为主要原料，采用烘烤预处理结合果胶酶酶解技术对枣中的营养及生理活性成分进行浸提，通过正交试验筛选出理想取汁工艺，确定出最佳工艺参数为：加酶量0．2％，浸提时间4h，浸提温度50℃，料水比1：3。     

酶法提取怀菊花总黄酮工艺研究

用正交实验确定酶法提取怀菊花总黄酮的最佳提取工艺条件为:料液比为1∶ 10,酶解温度45 ℃,pH=6.2,纤维素酶用量0.25 g/L,果胶酶用量0.3 g/L,酶解时间150 min,浸提时间60 min,浸提液体积40 mL.在此条件下怀菊花总黄酮的得率可达6.83%.     

酶法提取葡萄皮渣中白藜芦醇工艺研究

本实验研究了酶法提取葡萄皮渣中白藜芦醇工艺。对影响酶法提取的酶解温度、酶解时间、浸提温度、浸提时间和浸提次数五个因素进行考察,得出最佳提取工艺条件为:葡萄皮渣与纤维素酶的配比为1000:1,在60℃下酶解90min,酶解后加入乙酸乙酯,在30℃下浸提0.5h,浸提两次。在此条件下,白藜芦醇得率为0.93mg/g。     

太谷壶瓶枣酒生产工艺的研究

以山西太谷壶瓶枣为原料,通过单因素和正交试验,研究了红枣汁浸提以及红枣酒发酵的最佳方式及工艺参数。结果表明,热水浸提(加水量4倍,浸提温度90℃,浸提时间100 min)与果胶酶酶解浸提(果胶酶添加量0.1%,酶解温度50℃,酶解时间3 h)结合浸提效果最佳;红枣酒发酵的最佳工艺条件为:发酵温度20℃,酵母接种量0.4%,发酵时间7 d。     

洋葱杜仲山葡萄酒的研制

以洋葱、杜仲、山葡萄酒为原料,经过浸提、调配、冷冻处理等工艺,采用了正交设计试验确定了洋葱杜仲山葡萄酒的最佳工艺条件和配方。结果表明:杜仲浸提液的最佳工艺条件:杜仲与乙醇比为1∶10,浸提温度60℃,浸提时间1.5h。洋葱杜仲山葡萄酒口味最佳配比,洋葱浸提液添加量10%,杜仲浸提液添加量2%,加糖量10%。洋葱杜仲山葡萄酒稳定性的最佳处理为果胶酶加量0.02g/100mL,酶解温度50℃,酶解时间1.5h。洋葱杜仲山葡萄酒最佳冷冻条件:冷冻温度-6℃,冷冻时间7d。     

沙棘、雪菊保健饮料的加工工艺研究

以沙棘、昆仑雪菊为主要原料,研究了沙棘、雪菊保健饮料的制作工艺,并着重研究了复合酶解榨汁技术的工艺条件、双频超声波辅助浸提技术的工艺条件和饮料的调配配方,确定了饮料最佳的工艺参数。最佳的复合酶解榨汁工艺条件为:p H3.0、复合酶制剂添加量0.6%、酶解温度50℃、酶解时间2.5 h;最佳的双频超声浸提工艺条件为:超声复合频率为20 k Hz/50 k Hz,声强为0.7 W/cm2,超声浸提温度为55℃,浸提时间为1.5 h;最佳配方组合是:沙棘汁20%、雪菊浸提液30%、砂糖10.0%、柠檬酸0.3%。制得的产品风味独特,营养丰富。     

酶法提取黑木耳多糖

研究了酶法提取黑木耳多糖的最佳工艺条件。以提取率为指标,分别考察了浸提剂倍数、酶解pH、温度、时间、加酶量对果胶酶或纤维素酶酶解反应的影响。试验确定了果胶酶酶解木耳的最佳工艺条件:浸提剂倍数50,pH5.0,温度55℃,时间80min,酶加量1.1%,在此条件下,黑木耳多糖的提取率为4.15%;纤维素酶酶解木耳的最佳工艺条件:浸提剂倍数50,pH5.0,温度50℃,时间80min,酶加量为1.3%,黑木耳多糖的提取率为4.71%。     

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