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%。     

酶法提取豆粕中总膳食纤维的研究

本文以豆粕为原料,利用木瓜蛋白酶和糖化酶分别去除豆粕中蛋白质和淀粉,用95%乙醇沉淀可溶性膳食纤维,过滤后用乙醇、丙酮洗涤滤渣,去除脂肪等脂溶性物质,干燥,即得总膳食纤维.结果表明:木瓜蛋白酶最佳工艺条件为:加酶量16%、温度50℃、时间3h、pH7;糖化酶最佳工艺条件:加酶量2.0%、温度60℃、时间2h、pH4.04.6.总膳食纤维提取率为36.74%.     

生姜可溶性膳食纤维的酶法提取工艺中植物蛋白酶条件的确定

采用植物蛋白酶和糖化酶联合提取生姜中可溶性膳食纤维,固定糖化酶提取条件,探讨植物蛋白酶的工艺条件。在固定糖化酶加酶量1%,酶解温度60℃,酶解时间1h的条件下,确定了植物蛋白酶的优化条件为加酶量6%,酶解温度55℃,酶解时间5h,此条件下生姜中可溶性膳食纤维提取率高达13.24%。     

酶法提取生姜中可溶性膳食纤维及抗氧化活性的研究

探讨酶法辅助提取生姜中可溶性膳食纤维的工艺条件及其抗氧化活性。在固定糖化酶加酶量1%,酶解温度60℃,酶解时间1h条件下,通过单因素实验探讨了植物蛋白酶加酶量、酶解时间、酶解温度等因素对生姜中可溶性膳食纤维提取率的影响,结果为植物蛋白酶加酶量6%,酶解温度55℃,酶解时间4h。在单因素实验的基础上,通过正交实验优化最佳提取条件,结果表明:植物蛋白酶最佳工艺条件为加酶量6%,酶解温度60℃,酶解时间5h,生姜中可溶性膳食纤维提取率高达12.82%。生姜中可溶性膳食纤维对.OH自由基表现出较强的清除能力,在0.6mg/mL~3mg/mL浓度范围内清除率与浓度呈较好的量效关系,IC50为1.95mg/mL。     

酶法提取生姜膳食纤维工艺研究

采用酶法提取生姜中的膳食纤维,利用植物蛋白酶、糖化酶依次水解除去生姜中的蛋白质和淀粉,95%乙醇沉淀可溶性膳食纤维,过滤后用乙醇、丙酮洗涤滤渣,去除脂肪等脂溶性物质,干燥得膳食纤维。结果表明：植物蛋白酶最佳工艺条件为加酶量10%、时间3h、pH值7、温度55℃;糖化酶最佳工艺条件为加酶量1.4%、时间1h、温度60℃;生姜中总膳食纤维提取率为66.90%。     

超声辅助酶解法提取豆渣膳食纤维研究

为增加豆渣的附加值,研究豆渣中膳食纤维的酶水解提取工艺.通过超声波辅助脱脂、木瓜蛋白酶脱蛋白、单因素试验和正交试验相结合,详细探讨木瓜蛋白酶用量、酶解温度、酶解时间和溶液pH值对总膳食纤维提取率的影响.结果表明,最佳提取工艺为:木瓜蛋白酶用量0.3%、酶解温度50℃、酶解时间90min、pH值5.0.在此条件下,总膳食纤维产率为62.6%.     

响应面法优化玉米胚芽粕中膳食纤维酶解提取工艺

采用响应面法探讨玉米胚芽粕中提取水溶性膳食纤维的酶解工艺条件。通过单因素和响应面分析法,考察纤维素酶的加酶量、酶解时间和料液比对水溶性膳食纤维提取率的影响,优化了提取工艺参数。结果表明:纤维素酶的最佳提取工艺条件为纤维素酶量13Iu/g、液料比13∶1、时间为3.0h,在该条件下玉米胚芽粕中水溶性膳食纤维的提取率为6.65%,占总膳食纤维的49.01%。     

双酶法提取牛蒡根中水溶性膳食纤维及其抗氧化活性的研究

采用双酶法探讨牛蒡根中水溶性膳食纤维的提取工艺,并研究了其抗氧化活性.结果表明:风味蛋白酶的最佳工艺条件:加酶量10%,时间4h,pH 7.0,温度55℃;糖化酶的最佳工艺条件:加酶量1.2%,时间1h,温度60℃,水溶性膳食纤维提取率为11.05%.牛蒡根中水溶性膳食纤维对·OH和O2-·自由基均表现出较强的清除能力,其IC50分别为1.96mg/mL和0.39mg/mL.     

武夷岩茶茶渣非水溶性膳食纤维提取工艺研究

以冲泡后的岩茶茶渣为原料,采用酶法研究膳食纤维(IDF)的提取工艺参数,得出用α-淀粉酶处理茶粉的粗膳食纤维提取条件是:酶解温度55℃、酶添加量0.06 g/g、p H 9、酶解时间1 h、料液比1∶15(g/m L);木瓜蛋白酶精制IDF的最佳工艺条件是:酶解温度45℃、酶添加量0.004 g/g、p H值为4、酶解时间2 h、料液比1∶15(g/m L),此条件下膳食纤维的提取率最高,为97.12%。     

响应面法优化提取罗布麻可溶性膳食纤维的工艺研究

以罗布麻为原料,采用双酶法(植物蛋白酶和糖化酶)从中提取可溶性膳食纤维。在单因素试验的基础上,采用响应面分析法,选取料液比、植物蛋白酶酶解温度和酶解时间为自变量,可溶性膳食纤维提取率为响应值,确定罗布麻叶中SDF的最佳提取条件为:料液比1∶25(g/m L)、植物蛋白酶酶解时间3.8 h、酶解温度54.7℃、添加量8%以及糖化酶添加量1.0%。在此条件下SDF的提取率为38.12%。     

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