利用牛蒡渣提取高活性膳食纤维的工艺

以牛蒡渣为原料 ,提取水溶性膳食纤维和水不溶性膳食纤维。正交试验结果表明 ,提取水溶性膳食纤维的适宜条件为 :温度 80℃ ,pH 2 0 ,时间 90min ,V (原料 ) :V (水 ) =1∶10 ,得率为1 0 % (以干渣计 ) ,成品色泽呈淡黄色 ,气味较好 ;水不溶性膳食纤维的提取条件为 :温度 60℃ ,pH2 0 ,时间 60min ,V (原料 )∶V(水 ) =1∶5 ,得率为 8 5 % (以干渣计 ) ,成品色泽呈白色 ,气味淡 ,其膨胀力高达 6 5mL/g ,持水力为 72 0 %     

正交试验优化菠萝果渣膳食纤维制备及其性质的比较

以菠萝果渣为原料,分别采用酸法和碱法制备水溶性和不溶性膳食纤维,初步分析比较两种方法制备的水不溶性膳食纤维的理化性质。结果表明：酸法制备水溶性膳食纤维的最佳条件为温度90℃、pH1.0、时间90min、料液比1:10,其得率为8.1%(以干渣计),水不溶性膳食纤维提取条件为温度60℃、pH2.0、时间60min,得率为24.4%(以干渣计),水不溶性膳食纤维的膨胀力高达9.25mL/g,持水力为5.85g/g,持油力为1.35g/g、阳离子交换能力为0.21mmol/g;碱法制备的水不溶性膳食纤维最佳提取条件为碱液质量分数1%、料液比1:15、时间40min、温度50℃,其得率为62.80%,持水力为3.82g/g、膨胀力为10.66mL/g、持油力为1.75g/g、阳离子交换能力为0.27mmol/g。故碱法制备的水不溶性膳食纤维得率更高,性质相对较好。     

高温蒸煮结合酶解改性枣渣膳食纤维

为探讨高温蒸煮结合纤维素酶酶解改性枣渣水不溶性膳食纤维的工艺。以枣渣为原料,采用高温蒸煮、纤维素酶酶解改性枣渣水不溶性膳食纤维,以水溶性膳食纤维得率为指标,在单因素实验基础上,采用Box-Behnken中心组合设计,通过响应面法优化高温蒸煮结合酶解改性工艺条件。结果表明:枣渣水不溶性膳食纤维经120℃高温蒸煮60 min,纤维素酶改性枣渣水不溶性膳食纤维最佳工艺条件为酶浓度0.55%、p H4.6、料液比1∶27 g/m L、酶解温度43℃,酶解时间2.5 h,在此条件下水溶性膳食纤维得率为20.03%±0.58%,与模型预测值20.37%较为一致。响应面回归方程与实验结果拟合性好,说明此模型合理可靠,可为枣渣水不溶性膳食纤维改性的工业化应用提供一定参考。     

新疆紫花苜蓿水不溶性膳食纤维的制备及脱色研究

以提取苜蓿蛋白后的新疆紫花苜蓿渣为原料,提取水不溶性膳食纤维的实验研究,研究的关键在于对膳食纤维进行脱色与去除草腥味.由正交实验结果表明:提取水不溶性膳食纤维的最优提取条件为:碱浸温度为30℃,碱浸时间40 min,酸浸温度为90℃,酸浸时间为3 h,得率为73.91%.采用混合溶剂处理使水不溶性膳食纤维呈白色且无草腥味,其膨胀力高达8.15 mL/g,持水力为830%.     

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.     

杨梅渣膳食纤维提取工艺

以杨梅渣为原料,连续提取水溶性和不溶性膳食纤维,在单因素试验基础上,通过正交试验优化提取工艺条件。试验表明,适宜水溶性膳食纤维提取工艺为:以柠檬酸为浸提剂,料液比(g∶mL)1∶10,pH值2.0,90℃提取75 min,在此条件下提取率达58.62%。适宜的不溶性膳食纤维提取工艺为:料液比(g∶mL)1∶12.5,pH值2.5,60℃提取90 m in,在此条件下提取率达61.25%。所制备的不溶性膳食纤维持水力为570.6%、溶胀性为6.5 mL/g,功能特性良好、生理活性突出。     

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。     

酶-化学法提取生姜渣中膳食纤维的工艺研究

以生姜渣为原料,对酶-化学法提取其中膳食纤维的工艺进行探究。考察α-淀粉酶添加量与NaOH用量、水解时间、水解温度对生姜渣中可溶性和不可溶性膳食纤维得率的影响,以可溶性膳食纤维得率为标准,通过单因素、正交试验优化出提取的最优工艺为:α-淀粉酶用量0.3%,NaOH用量2.0%,水解时间50 min,水解温度70℃,在此工艺条件下,生姜渣中可溶性膳食纤维得率28.58%、不溶性膳食纤维得率66.21%。     

酶碱法提取杏渣中水不溶性膳食纤维

本文介绍了以杏渣为原料,采用酶碱法水解淀粉,蛋白质、脂肪的方法提取杏渣中水不溶性膳食纤维,探汁了时川,温度,固液比,酶浓度等因素对水不溶性膳食纤维得率的影响。通过正交试验确定了酶碱法提取杏渣中水不溶性膳食纤维的最他工艺条件,其中酶作用提取水不溶性膳食纤维的最佳工艺条件为：时间为60min,温度为50℃,酶浓度为0．6％（0．2716g中性蛋白酶）,固液比为1：10,在此条件下杏渣中水不溶性膳食纤维得率达67．23％。     

秋葵中水溶性膳食纤维提取工艺研究

以秋葵为原料,采用单因素和正交试验方法研究了提取温度、提取时间、料液比和提取液的pH对酸水解提取秋葵中可溶性膳食纤维的影响,并优化了酸水解法提取秋葵中可溶性膳食纤维的工艺。结果表明：酸水解法提取秋葵中可溶性膳食纤维的优化工艺条件为料液比1∶15(g∶mL)、pH 7.0、提取温度80 ℃、提取时间110 min,在此条件下的水溶性膳食纤维的得率为12.65%。     

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