萝卜籽蛋白提取及其功能性质研究

以萝卜籽为原料,用正己烷脱脂得萝卜籽粕,采用碱溶酸沉法对萝卜籽粕中的蛋白质进行提取,并测定其等电点。通过考察料液比、碱溶p H、浸提时间和浸提温度对萝卜籽蛋白提取率的影响,确定最佳的萝卜籽蛋白提取条件,并对所提取的萝卜籽蛋白和大豆分离蛋白进行功能性质的对比。结果表明:萝卜籽蛋白溶解度为84.9%,有很高的营养价值;在料液比1∶20、碱溶p H 9.0、浸提时间120 min、浸提温度50℃的条件下,萝卜籽蛋白提取率为52.3%;萝卜籽蛋白等电点有两个,分别为p H 0.5和p H 4.5;萝卜籽蛋白吸油能力为328.67%,乳化性及乳化稳定性与大豆分离蛋白相近,起泡性及泡沫稳定性较大豆分离蛋白好。     

响应面法优化牡丹籽粕蛋白提取工艺及其功能性质

以脱脂牡丹籽粕主要原料,在碱溶酸沉法的基础上,采用超声波辅助酶解法提取其中蛋白质。研究超声温度、超声时间、料液比、糖化酶剂量对蛋白质得率的影响,利用响应面法优化牡丹籽粕蛋白质提取工艺条件,并将提取的牡丹籽粕蛋白功能性质与大豆分离蛋白进行对比。结果表明:提取牡丹籽粕蛋白的最佳工艺条件为料液比1∶10 (g/mL)、超声温度50℃、超声时间120 min、糖化酶添加量2%;影响因素大小按顺序排列为超声温度>超声时间>糖化酶剂量>料液比;最优工艺条件下的牡丹籽蛋白质得率为26.65%,其蛋白质含量为91.02%;牡丹籽粕蛋白的持水性、泡沫稳定性和乳化稳定性比大豆分离蛋白强,但其吸油性、乳化性和起泡性弱于大豆蛋白。     

羊栖菜蛋白质提取及功能性研究

以羊栖菜为原料,考察提取工艺对其蛋白质得率的影响,并研究羊栖菜蛋白质的功能特性。通过单因素试验考察了液料比、碱质量分数、浸提温度和浸提时间等4个因素,根据Box-Benhnken试验设计和响应面分析法确定羊栖菜蛋白提取的最佳工艺条件。结果表明,羊栖菜蛋白的最佳提取条件为液料比21∶1（mL∶g）,碱质量分数2.5%,浸提温度57 ℃,浸提时间5 h。在此最佳工艺条件下,蛋白质得率为28.95%。羊栖菜蛋白的起泡性高达76.7%,优于大豆分离蛋白,而吸水性、吸油性、乳化能力、乳化稳定性、泡沫稳定性均不如大豆分离蛋白。     

山苍子蛋白碱提工艺优化及其功能性质研究

以山苍子提油后的粕为原料,采用碱溶酸沉法提取山苍子蛋白,以浸提p H、料液比、浸提温度、浸提时间为考察因素,运用单因素试验和正交试验确定山苍子蛋白的最佳提取工艺条件,并测定了山苍子蛋白的起泡性、乳化能力、持水能力等功能性质。结果表明:在碱液pH 11、料液比1∶15、浸提温度35℃、浸提时间60 min时,山苍子蛋白的提取率达到31. 03%,粗蛋白提取物中蛋白质含量为75%。山苍子蛋白等电点在4. 0左右,酸性pH范围溶解性较低,中性至碱性p H范围溶解性较高,起泡性和泡沫稳定性在偏碱性pH范围较高,山苍子蛋白持水力在温度低于60℃时高于大豆分离蛋白。     

银叶树种子蛋白的提取及其功能性研究

以银叶树种子为原料,考察提取工艺对其蛋白提取率的影响。通过单因素实验对影响银叶树种子蛋白提取率的p H、提取时间、液料比和提取温度等四个因素进行研究,并采用Box-Behnken实验设计和响应曲面分析法确定银叶树种子蛋白提取的最佳工艺条件。结果表明:最佳提取工艺条件为提取温度55℃、p H10、提取时间2h、液料比11∶1,在此条件下蛋白提取率为50.85%;银叶树种子蛋白的吸水性、起泡性和泡沫稳定性优于大豆分离蛋白;而大豆分离蛋白的吸油性、乳化能力和泡沫稳定性优于银叶树种子蛋白。     

油茶籽粕蛋白质提取工艺及功能特性研究

以油茶籽粕为原料,采用碱溶酸沉法提取油茶籽粕中的蛋白质,运用正交试验方法确定最佳提取工艺条件,并与大豆分离蛋白的功能性进行比较研究。结果表明:当料液比1∶20,pH值8.0,浸提时间130 min,浸提温度60℃时提取效果最好,蛋白提取率可达48.59%;油茶籽蛋白的吸油性、乳化稳定性和起泡性优于大豆分离蛋白;而大豆分离蛋白的吸水性、乳化能力和泡沫稳定性优于油茶籽蛋白。     

牡丹籽分离蛋白提取工艺及乳化特性

采用单因素试验及响应面试验优化盐溶法提取牡丹籽分离蛋白工艺,并测定不同p H下牡丹籽分离蛋白的乳化特性。结果表明:牡丹籽分离蛋白的最佳提取工艺条件为提取时间69 min、提取温度40℃、料液比1∶20、Na Cl浓度1.03 mol/L,在此条件下牡丹籽分离蛋白得率为(23.49±1.21)%,纯度为(90.75±0.87)%;牡丹籽分离蛋白乳液在p H为8时,乳化能力、乳液热稳定性均最高,分别为(85.27±1.23)%和(90.74±1.07)%;乳液在p H 2~5时,形成Pickering乳液,显著增加乳液热稳定性、粒径,改变乳液颜色;乳液p H 8~10,形成O/W型乳液,乳液p H越高,乳化能力、乳液热稳定性越低,乳液粒径越小,乳液颜色越深;乳液中性条件下,粒径较大,热稳定性较低。     

番木瓜籽蛋白质的提取工艺及其功能性质

以番木瓜籽为原料,经脱脂以酸沉碱溶法提取其中的蛋白质,并研究其乳化、起泡等功能性质。结果表明,最佳的提取工艺条件:料液比1∶40,p H为9.3,温度50℃,碱提时间120 min时最高提取率达到48.53%。番木瓜籽蛋白质的乳化性及稳定性随着蛋白质的浓度升高而升高,在p H3时最小,其乳化性在Na Cl浓度为0.2%时最大,而稳定性呈下降趋势;起泡性及稳定性随蛋白浓度升高而升高,在p H3.0,其起泡性和泡沫稳定性最小,在离子浓度(Na Cl)为0.2 mol/L时,其起泡性和泡沫稳定性最高。可见,此提取工艺效果较好,能将部分番木瓜籽蛋白质提取出来;番木瓜籽分离蛋白质乳化性和起泡性良好,这为番木瓜籽蛋白质的开发利用提供参考依据。     

牡丹籽粕蛋白提取工艺优化及特性分析

本研究通过碱溶酸沉法对牡丹籽粕中的蛋白进行提取。选取料液比、pH、时间和温度进行单因素研究,结合响应面法优化获得最佳提取工艺,并对蛋白的物化特性进行分析。确定最佳工艺条件：料液比1:25 g/mL,pH10.6,温度55℃,时间130 min时,蛋白得率为23.81%±0.04%。在此条件下获得的牡丹籽粕蛋白中含有18种氨基酸;蛋白的持水性和持油性分别为3.72和3.67 g/g;起泡性和泡沫稳定性在pH2～4时均明显降低,pH4时最小,pH6～10之间时,起泡性持续增加,泡沫稳定性明显上升后略有下降;乳化性和乳化稳定性随p H增大而增加,与粒径和Zeta电位所反映的结果相符。本研究为牡丹籽粕蛋白的工业化生产和综合利用提供了理论依据。     

银叶树果壳蛋白质的提取及功能性研究

以银叶树果壳为原料,考察提取工艺对其蛋白质得率的影响。通过单因素试验考察了液料比、Na OH浓度、提取温度、提取时间等四个因素,根据Box-Benhnken试验设计和响应面分析法确定银叶树果壳蛋白提取的最佳工艺条件。结果表明:银叶树果壳蛋白的最佳提取条件为液料比32∶1(m L/g);Na OH浓度22mg/m L;提取温度50℃;提取时间4h。在此条件下蛋白质得率为4.89%。银叶树果壳蛋白的吸水性、起泡性优于大豆分离蛋白,而吸油性、乳化能力、乳化稳定性、泡沫稳定性均不如大豆分离蛋白。     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.