花生浓缩蛋白的制备工艺研究

以低温花生粕为原料,采用醇洗法制备花生浓缩蛋白,研究了乙醇溶液体积分数、浸洗温度、浸洗次数及固液比对产品中蛋白质含量的影响.通过正交实验确定的最佳工艺条件为:乙醇溶液体积分数60%,浸洗温度50℃,固液比1∶8,浸洗次数5次(每次30 min).在该条件下制备的产品中粗蛋白含量为68.15%(N×6.25,干基),氮溶解指数(NSI)为32.72%.     

冷榨花生饼混合溶剂萃取生产浓缩蛋白工艺条件的研究

本文以冷榨花生饼为原料,采用混合溶剂浸洗工艺制取花生浓缩蛋白。通过单因素试验和正交试验得到的最佳工艺条件为：溶剂比（正己烷：乙醇）3．5：6．5,乙醇浓度75％,时间60min,温度50℃,料液比1：11,萃取4次。在此条件下所得产品的粗蛋白含量70．50％,残油率（1．52％,NSI值20．78％。混合溶剂浸洗工艺较单纯的醇洗工艺所得产品的蛋白质含量、功能性及残油率显著改善,这对拓展花生浓缩蛋白在食品业的应用有重要意义。     

文冠果种仁冷榨饼制取醇洗浓缩蛋白的研究

以文冠果种仁冷榨饼为原料,利用醇洗工艺制取醇洗浓缩蛋白。通过单因素试验和正交试验得到的最佳工艺条件为:乙醇体积分数55%,醇洗时间60 min,醇洗温度50℃,液料比10∶1,醇洗次数2次。各因素对蛋白质含量的影响大小顺序依次是乙醇体积分数醇洗温度液料比醇洗时间。在最佳工艺条件下所得文冠果种仁醇洗浓缩蛋白的蛋白质含量为67.80%,氮溶解指数(NSI)为35.10%。文冠果种仁醇洗浓缩蛋白是一种优质的食用浓缩蛋白。     

热榨芝麻饼生产浓缩蛋白工艺条件的研究

以热榨芝麻饼为原料,利用正己烷-50%乙醇混合溶剂浸提生产芝麻浓缩蛋白。以混合溶剂中乙醇体积分数、醇洗时间、固液比和浸提温度为考察因素,进行单因素实验和正交实验,研究热榨芝麻饼生产浓缩蛋白的最佳工艺。结果表明,芝麻浓缩蛋白最佳生产工艺条件为:混合溶剂中乙醇体积分数55%,浸提温度55℃,固液比1∶6,醇洗时间85 min。在最佳条件下所得芝麻浓缩蛋白的粗蛋白质含量为66.89%,粗脂肪含量为0.53%,氮溶解指数为2.56%。     

醇法大豆浓缩蛋白改性工艺条件的研究

主要对醇法大豆浓缩蛋白改性工艺条件进行了研究,探讨了改性过程中加水温度、溶液pH、超声时间对改性工艺的影响。通过正交实验得出最佳工艺条件为:将醇法大豆浓缩蛋白加100℃水溶解,调pH为10,超声时间30 m in,在此条件下生产的产品水溶性蛋白质可达57.2%,氮溶解指数(NSI)为81.5%。     

醇法花生浓缩蛋白改性工艺研究

对醇法花生浓缩蛋白产品进行物理改性,探讨了热水温度、溶液pH、超声波处理时间对产品功能特性的影响.通过正交实验得出优化的改性工艺条件为:将醇法花生浓缩蛋白加入100℃热水中溶解,固液比1:9,调pH为9,超声波功率300 W,频率25 kHz,超声波处理时间30 min.改性产品的蛋白含量为65.86%(N×6.25,干基),氮溶解指数(NSI)为64.68%.     

高温花生饼粕生产醇洗浓缩蛋白工艺条件的研究

以高温花生饼粕为原料,采用醇洗工艺生产花生浓缩蛋白。通过单因素实验和正交实验得到高温花生粕醇洗的最佳工艺条件为:乙醇溶液体积分数55%,浸提温度70℃,料液比1∶8,浸提时间80 min,浸提次数2次。在此条件下所得花生粕醇洗浓缩蛋白的粗蛋白含量(干基)68.92%,残油率0.79%。利用同样条件所得高温花生饼醇洗浓缩蛋白的粗蛋白含量(干基)65.23%,残油率3.32%。高温花生粕乙醇浸提糖蜜组分:水分35.02%,粗蛋白10.73%,总脂肪4.36%,磷脂0.783%,总糖33.53%,灰分9.87%;高温花生饼乙醇浸提糖蜜组分:水分28.19%,粗蛋白11.59%,总脂肪10.02%,磷脂0.806%,总糖38.76%,灰分7.14%。     

苦杏仁醇洗浓缩蛋白制取及脱苷条件研究

以脱皮苦杏仁冷榨饼为原料,采用醇洗工艺制取浓缩蛋白同时脱除苦杏仁苷。通过单因素实验和正交实验得到的最佳工艺条件为:乙醇体积分数75%,提取温度50℃,液料比11∶1,提取时间50 min,提取次数5次。在最佳工艺条件下制取苦杏仁醇洗浓缩蛋白的蛋白质含量为73.61%,苦杏仁苷含量为5.53 mg/kg,苦杏仁苷近乎被完全脱除(脱除率为99.995%)。所得产品颜色洁白、风味清淡略有坚果香味,蛋白质NSI值64.61%,是一种优质的食用蛋白产品。乙醇萃取液即苦杏仁糖蜜中苦杏仁苷含量为3.94%,是提取苦杏仁苷的良好原料。     

Viscozyme L预处理花生粕提取花生浓缩蛋白的研究

为了优化复合植物水解酶(ViscozymeL)预处理花生粕结合乙醇洗涤法制备花生浓缩蛋白的工艺条件,以花生粕为原料,采用单因素实验和响应面实验设计方法,研究花生浓缩蛋白制备工艺条件对蛋白质量百分含量和提取率的影响。结果表明,ViscozymeL预处理花生粕结合乙醇洗涤法制备花生浓缩蛋白的最优工艺参数为:酶添加量6.1 FBG/g、pH值4.2、酶解温度43℃、酶解时间4.5 h,在最佳工艺条件下,蛋白的质量百分含量和提取率验证实验值分别为73.21%±0.59%和85.23%±0.67%,两者与模型预测值的差异均小于1%。为进一步开发利用花生粕提供了一种新途径。     

多级逆流醇浸法制取大豆浓缩蛋白工艺的研究

大豆浓缩蛋白具有比脱脂蛋白粉蛋白质含量高和比大豆分离蛋白价格低的优势,广泛应用于各种食品体系中.目前,世界上大豆浓缩蛋白的生产方法主要是乙醇浸洗法,本文采用多级逆流醇浸法,对影响大豆浓缩蛋白的工艺条件,如浸取温度、料溶比、乙醇溶液的浓度和浸取时间进行了较为详尽的研究.通过正交实验及结果分析,确定了其最佳的工艺条件为为:浸取温度60℃,料溶比1:5,乙醇溶液浓度60%,浸取时间30min.     

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