百合大米乳饮料生产工艺及关键技术的研究

研究了百合大米乳饮料的生产工艺,并通过正交实验对百合大米乳饮料生产的关键技术条件及其配方和稳定剂组成进行了优化.结果表明,采用α-淀粉酶水解百合与大米浆液的最优条件分别为:加酶量0.01 g酶/g干百合、60min、65℃、pH6.0,加酶量0.02 g酶/g大米、60 min、65℃、pH6.0;采用0.05%瓜儿豆胶、0.27%明胶、0.06%单甘酯、0.04%蔗糖酯构成的复合稳定剂可取得较理想的稳定效果;采用百合汁:大米汁=1:2、1.0%脱脂乳粉、2.0%蔗糖的原料配方以及均质压力25MPa和90℃杀菌10min的生产条件,百合大米乳饮料具备了较好的风味和品质.     

果胶对酸性乳饮料稳定性的影响

酸性乳饮料的稳定性与稳定剂的含量、均质压力、均质温度、pH有关。选取果胶作为稳定剂,探讨了工艺条件对酸性乳饮料稳定性的影响。结果表明：果胶添加量0.4%、均质压力20MPa、均质温度50℃、pH4.3时酸性乳饮料的稳定性最好。     

新型甘薯乳饮料的研制

对适宜于甘薯乳饮料的稳定性进行了筛选实验,采用正交试验法对甘薯乳饮料的最佳工艺条件进行了研究。结果表明：采用由0.1%琼脂、0.1%黄原胶和0.1%CMC-Na构成的复合稳定剂的稳定效果较好;采用甘薯：水＝1：5,脱脂乳粉的添加量为2％,复合稳定剂的用量为0.45%和均质压力为30MPa的条件生产时,甘薯乳饮料的风味和产品稳定性较好。     

水溶性大豆多糖和果胶作为酸性乳饮料稳定剂的研究

通过改变酸性乳饮料的加工工艺比较了大豆多糖和果胶在稳定酸性乳饮料时的差异.结果表明,温度和调酸的顺序对添加了大豆多糖的酸性乳饮料稳定性的影响比对添加了果胶的酸性乳饮料稳定性的影响更为显著.在0℃时调酸和调酸之后均质的条件下,添加有0.40%大豆多糖的酸性乳饮料的稳定性最好,沉淀率最低为0.69%;而添加有0.35%果胶的酸性乳饮料的沉淀率为0.71%.而且进一步验证了大豆多糖能在pH值为3.4～4.4范围内稳定酸性乳饮料,而果胶只能在pH值为3.6～4.4范围内稳定酸性乳饮料.     

果汁乳饮料稳定性研究

论述了影响果汁乳饮料稳定性的因素,从稳定剂、杀菌条件、均质三方面对果汁乳饮料稳定性进行研究,确定了最佳稳定条件是：CMC添加量0.25％,PGA添加量0.15％,柠檬酸三钠添加量0.2％,蔗糖酯添加量0.1％,杀菌条件为80℃、10min,均质压力为20MPa。     

黑糯米乳饮料乳化稳定剂配方与均质工艺优化

试验以黑糯米为主要原料研制谷物乳饮料,分析了影响黑糯米乳饮料稳定性的主要因素,对其乳化稳定剂的配方及均质加工工艺进行了系统优化。结果表明:黑糯米乳饮料的最适HLB为7.48,即蔗糖脂肪酸酯与蒸馏单硬脂酸甘油酯的最佳质量比为4︰6,复合乳化剂的添加量为0.08%;稳定剂的最佳配方为羧甲基纤维素0.08%、黄原胶0.14%和海藻酸钠0.05%;最佳的均质条件为均质压力20 MPa,均质温度60℃,均质次数2次。     

羧甲基纤维素钠及酸性乳饮料加工工艺对其稳定性及粒径分布的影响

研究了羧甲基纤维素钠（CMC）及酸性乳饮料加工工艺对其稳定性及粒径分布的影响。通过离心沉淀法检测酸性乳饮料的稳定性．对影响稳定效果的主要加工工艺进行了试验。同时测定了这些加工工艺对产品粒径分布的影响,并分析了体系粒径分布与产品稳定性之间的关系。结果表明,CMC添加量、pH值、均质压力、调酸温度等因素都会影响酸性乳饮料的稳定性和粒径分布,其中CMC添加量和均质压力对结果影响明显,调酸温度次之,pH值对结果影响最小。     

碎米米乳饮料的研制

本文研究了以碎米为主要原料制备米乳饮料的工艺。运用α-淀粉酶对米浆进行液化,糖化酶进行糖化,取酶解后的上清液进行饮料配制。对饮料配方及稳定性条件做正交优化,以产品的感官评分和稳定系数为指标,选出米乳饮料的最佳配方为：碎米10%、牛奶2%、低聚果糖2%、蔗糖3%;最佳稳定性条件为蔗糖酯0.1%、CMC 0.02%、海藻酸钠0.1%、均质压力40 MPa。所得产品口感、风味、稳定性均获得满意效果。     

绿豆乳饮料加工技术研究

采用正交试验对绿豆乳饮料的加工工艺和技术参数进行研究,以感官评定进行配方优选,得到绿豆乳饮料稳定剂最优配方为:明胶0.10%,卡拉胶0.05%,黄原胶0.05%,瓜尔豆胶0.15%;最佳工艺参数为:均质温度为60℃,压力为25 MPa下均质两次;杀菌温度为121℃,时间为15 min。     

葵花籽乳饮料稳定性研究

针对葵花籽乳饮料体系,研究了体系的pH值、温度、金属离子以及均质条件引起的粒子大小 对葵花籽乳饮料的稳定性影响,初步探讨了葵花籽乳饮料的稳定性理论。     

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