酶-物理法提取木薯渣中膳食纤维的工艺研究

对干木薯渣进行物理粉碎,再用α-淀粉酶和糖化酶(中温淀粉酶60℃~70℃)、脂肪酶和风味蛋白酶除去木薯渣中的淀粉、脂肪和蛋白质,得到纯净的木薯膳食纤维并用超声波辅助脱色;通过单因素试验得到了木薯渣化学成分去除率和膳食纤维脱色的最佳工艺条件。化学成分去除的最佳工艺条件为:当α-淀粉酶和糖化酶的质量比1∶6,用量为0.6%,酶解pH=7,酶解时间为120 min,酶解温度为60℃时,淀粉去除率最高;当脂肪酶用量0.21%,酶解pH=7,酶解时间90 min,酶解温度为50℃时,脂肪去除率最高;当风味蛋白酶用量0.6%,酶解pH=4,酶解时间150 min,酶解温度为35℃时,蛋白质去除率最好。脱色的最佳试验条件为:当H2O2浓度为10%,漂白时间40 min,超声功率为60 W,漂白温度50℃时,漂白效果最好。     

双酶法提取小麦麸皮膳食纤维的工艺研究

以小麦麸皮为原料,采取双酶提取法制备小麦麸皮膳食纤维,通过正交实验得出最佳提取条件为:α-淀粉酶添加量为0.6%,α-淀粉酶酶解pH为6,α-淀粉酶酶解温度为70℃,碱性蛋白酶添加量为0.3%,碱性蛋白酶酶解pH为9,碱性蛋白酶酶解温度为55℃,此时小麦麸皮膳食纤维提取率为71.94%。     

正交试验优化酶法提取菜籽皮不溶性膳食纤维工艺

目的：以菜籽皮为原料,研究不溶性膳食纤维的酶法提取工艺条件。方法：采用淀粉酶和蛋白酶酶解菜籽皮,以不溶性膳食纤维得率为指标,通过正交试验优化最佳工艺条件。结果：淀粉酶加酶量0.7%,料液比1:20、pH5.5、温度40℃、酶解时间60min,在此条件下菜籽不溶性膳食纤维得率为81.24%;蛋白酶的添加量0.7%、料液比1:20、pH7.5、酶解温度40℃、酶解时间60min,在此条件下菜籽不溶性膳食纤维得率为77.13%。结论：确定了影响膳食纤维提取的主要影响因素,得到了菜籽皮不溶性膳食纤维酶解法提取的最佳条件。     

荞麦膳食纤维的研制

报道了以荞麦为原料,对荞麦壳申膳食纤维的提取及脱色工艺进行的研究.采用化学法和酶法分别制备荞麦膳食纤维,并对所得膳食纤维进行脱色.通过试验分别得到,化学法提取荞麦壳膳食纤维最佳工艺为:pH 5.0,反应温度为55℃时,NaOH质量分数为4%,水解时间60min;酶法提取荞麦壳膳食纤维最佳工艺为:pH 7.0±0.2时,蛋白酶质量分数为0.2%,反应时间60 min.两种方法比较得出,酶法提取效果较好.脱色最佳工艺为:pH 11,H2O2体积分数为4%,温度为90℃,反应时间为90 min.     

酶法提取花生粕不溶性膳食纤维的研究

以花生粕为原料,采取酶法提取花生粕中的不溶性膳食纤维,探讨α-淀粉酶、木瓜蛋白酶最佳酶解条件。结果表明:α-淀粉酶的最佳酶解条件为温度60℃,时间30 min,pH4.0,酶量2%;木瓜蛋白酶的最佳酶解条件为温度80℃,时间2 h,pH7.0,酶量11%,花生粕不溶性膳食纤维的提取率达到37.72%。     

胡萝卜渣膳食纤维提取工艺及其性能特性研究

通过水提醇沉法提取胡萝卜渣水溶性膳食纤维(CRSDF),通过外加淀粉酶和蛋白酶提取胡萝卜渣水不溶性膳食纤维(CRIDF),采用均匀设计优选提取工艺条件;通过测定CRIDF的膨胀性、持水力、结合水力、阳离子交换容量、结合脂肪能力及吸附胆酸钠能力来了解其性能特性.CRSDF提取的最佳工艺参数为时间60 min,液料比40:1(mL/g),pH值1.5,温度80%;提取率为70%.最佳酶解条件,淀粉酶为加酶量0.60%,时间60 min,pH值7.0,温度75℃;中性蛋白酶为加酶量0.30%,时间60 min,pH值7.0,温度70℃.利用胡萝卜渣提取膳食纤维得率较高,理化性能较好,有良好的发展前景.     

影响麦麸膳食纤维得率的因素分析

以麦麸为原料,采用生物法制备膳食纤维。正交实验结果表明,提取膳食纤维的最佳工艺参数为:混合酶制剂的用量为0.2%,α-淀粉酶∶糖化酶=1∶3,酶解时间30min,混合酶解温度65℃;蛋白酶用量为0.3%,酶解时间60min,酶解温度60℃。在此工艺条件下,纤维素得率为66.26%,成品呈淡黄色,气味淡。其溶胀性达6.88ml/g,持水力为7.3581%。     

酶法提取高品质浒苔膳食纤维工艺

以浒苔为原料,对浒苔膳食纤维提取和漂白工艺条件进行探讨;通过正交试验设计确定酶法提取膳食纤维和漂白的最佳条件。酶法提取膳食纤维的最佳条件,蛋白酶处理的温度为25℃、pH5、用酶量1%、时间为60min;α-淀粉酶处理的温度为30℃、pH6、用酶量0.1%、时间为20min;最佳漂白条件,漂白液浓度0.80%、pH6、漂白时间10min。在此条件下,提取率为40.22%、膨胀力为45.13mL/g、持水力为2171%。产品可作为高品质膳食纤维及理想的食品添加剂。     

茭白壳膳食纤维提取工艺及性能的研究

以芟白壳为原料,采用化学法制备可溶性膳食纤维和不溶性膳食纤维.正交实验结果表明,可溶性膳食纤维提取的最佳工艺条件为:pH2.0、温度80℃、时间90min.不溶性膳食纤维提取的最佳工艺条件为:碱解时NaOH浓度1.0mol/L、料液比1:20(g/mL)、温度60℃、时间60min;酸解时pH3.0、温度60℃、时间120min,其溶胀性为4.34mL/g,持水力为8.11g/g.     

双酶法分离提取米糠膳食纤维的研究

米糠是稻谷加工的副产物之一,其中米糠膳食纤维含量高达35%~50%,是理想的膳食纤维来源。实验研究了双酶法分离提取米糠膳食纤维的最佳工艺条件,并对所提膳食纤维的基本成分进行了分析。根据正交实验结果表明,提取米糠膳食纤维时,除淀粉的最佳条件为:耐高温淀粉酶,酶解时间3.5 h,酶解温度75℃,酶用量20μL;除蛋白的最佳条件为:碱性蛋白酶,酶解时间2.5 h,酶解温度60℃,酶用量2%。在最优条件下分离提取得到的米糠膳食纤维:总膳食纤维、不溶性膳食纤维和可溶性膳食纤维纯度分别为87.26%、68.23%和3.99%。根据扫描电镜结果显示,不溶性和可溶性膳食纤维表面均具有明显的蜂窝状结构。     

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