响应面法优化紫茄子皮原花青素提取工艺研究

原花青素能够阻止自由基的生成并能清除自由基,紫茄子皮中原花青含量丰富,提取其中的原花青素具有重要经济价值。考察浸提时间、乙醇浓度、料液比对原花青素提取率的影响,采用中心组合对提取工艺的料液比、浸提时间和乙醇浓度三因子进行响应面设计,得出原花青素最佳提取条件为料液比1∶15(g/m L)、浸提时间4 h、乙醇浓度80%时,提取率最高为10.46%。     

正交试验法优化苹果皮中原花青素的提取工艺研究

对苹果皮中原花青素的提取工艺条件进行了优化,在单因素的基础上,采用L9( 34)正交试验设计,研究乙醇浓度、料液比、提取时间和提取温度对苹果皮中原花青素得率的影响.结果表明,对苹果皮原花青素得率的影响顺序是:乙醇浓度＞料液比＞提取时间＞提取温度,有机溶剂提取苹果皮原花青素的最佳工艺条件是:乙醇浓度60％,料液比1∶10 (g/mL),提取温度65℃,提取时间120min,原花青素得率达到2.82mg/g于皮.     

葡萄籽原花青素的微波萃取工艺优化

以原花青素提取量为指标,考察微波处理时间、提取温度、乙醇体积分数、料液比等因素对葡萄籽原花青素提取的影响并利用正交优化试验设计确定微波萃取原花青素的最优工艺。结果表明:各因素对原花青素提取量的影响大小依次为微波温度微波时间乙醇体积分数料液比。微波提取原花青素最优工艺条件为微波处理时间20 min、微波提取温度80℃、乙醇体积分数50%、料液比1∶6(g/mL)。在此条件下,原花青素提取量均值为51.77 mg/g,相对标准偏差为1.45%。与传统浸提法相比,微波萃取原花青素耗时短、提取效率高,且对原花青素的破坏性小。     

超声提取葡萄籽原花青素工艺的优化及其抗氧化活性研究

研究利用响应曲面法优化超声提取葡萄籽原花青素的工艺。在单因素实验基础上,采用中心组合设计响应面实验,考察了提取温度、液料比、乙醇浓度以及超声时间对原花青素提取率的影响,并建立回归模型。优化后的工艺:提取温度55℃,液料比20(mL/g),乙醇浓度65%,超声时间10min;在此条件下葡萄籽原花青素的提取率为2.482%,与回归模型预测值的相对偏差为0.36%。同时进行了提取物的抗氧化性检验,结果表明葡萄籽原花青素对超氧阴离子自由基具有较好的清除能力,且呈剂量相关性。     

红玉米原花青素提取纯化与抗氧化性的研究及应用

红玉米富含原花青素,抗氧化能力较强。采用乙醇有机溶剂提取法对红玉米中原花青素的提取,考察提取温度、液料比和乙醇浓度等因素对原花青素提取率的影响。通过响应面试验获得红玉米提取原花青素的最佳条件：提取时间2.86 h、液料比19.70:1 mL/g、提取温度55.67℃。红玉米原花青素最高提取率为1.92 mg/g。通过原花青素的总抗氧化性能力测定得出,原花青素浓度在0～0.0292mg/mL范围内,随着红玉米原花青素的浓度增大,其总抗氧化能力也相应增大;当原花青素浓度达到0.0921 mg/mL时,其总抗氧化能力达到1.555μmol/mL。     

野葛花黄酮和花青素的提取及抗氧化性研究

为更好开发利用野葛,研究野葛花黄酮和花青素的超声辅助乙醇浸提工艺,以及黄酮和花青素提取物的抗氧化性。结果表明:野葛花黄酮的最佳工艺条件为料液比为1∶30(g/mL)、提取温度为40℃、提取时间为110 min,葛花黄酮得率为2.84%;野葛花花青素的最佳提取工艺条件为乙醇浓度60%,料液比1∶30(g/mL),提取时间120 min,提取温度60℃,花青素得率为2.17%;野葛花黄酮和花青素对羟自由基的清除效果明显优于抗坏血酸。试验结果可为综合开发利用葛根资源,延长葛根加工的产业链提供一定参考依据。     

蚕豆皮原花青素提取工艺优化

以蚕豆皮为材料,探讨微波预处理-乙醇提取法提取原花青素的工艺条件。分别考察预处理工艺中微波功率、微波时间、加水量,提取过程中的料液比、提取温度、提取时间对原花青素提取率的影响。结果表明：微波预处理-乙醇提取最佳工艺为微波功率140W、微波处理时间50s、加水量2mL/g、液料比21:1(mL/g)、温度55℃、70%乙醇溶液提取72min,原花青素提取率为94.53%。     

超声波辅助提取山竹果皮中的原花青素

文中研究了山竹果皮中原花青素的超声辅助提取工艺条件。通过单因素试验分析超声提取过程中超声功率、料液比、乙醇浓度、提取时间和温度等因素对原花青素提取率的影响,在此基础上,采用L9(34)正交试验优选出山竹果皮中原花青素提取的最佳条件。结果表明:各因素对原花青素提取率的影响大小顺序为乙醇浓度(B)>温度(C)>料液比(A)>时间(D);最佳工艺条件为料液比为1∶30,乙醇体积分数60%,提取温度50℃,提取时间45 min,此条件下山竹果皮中原花青素的提取率为15.61%。     

响应面法优化女贞子原花青素提取工艺及抗氧化研究

Box-Behnken响应面法优化超声辅助提取女贞子原花青素工艺。以原花青素的提取率为考察指标,提取时间、超声功率、液料比和乙醇体积分数为考察因素,采用四因素三水平做响应面分析。利用邻苯三酚法、DPPH和水杨酸法对女贞子原花青素抗氧化性进行研究。结果表明,女贞子中的原花青素的最佳提取工艺为:提取时间33 min,超声功率400 W,液料比27∶1(mL/g),乙醇浓度50%。在最佳提取条件下,原花青素的提取率为(2.85±0.06)%。当原花青素浓度为1.0 mg/m L时,对DPPH自由基的清除率可达到97%;对超氧阴离子的清除率可达到60.14%;对羟自由基的清除率可达到78.88%。该研究优化的女贞子原花青素提取工艺合理、稳定,技术可行,提取的原花青素有较好的抗氧化性。     

凤冈绿茶中原花青素的提取工艺优化

对凤冈绿茶中原花青素的提取工艺条件进行优化。本文在单因素试验基础上,采用响应面法研究原花青素提取工艺中乙醇浓度、超声温度、超声时间和料液比四个因素对凤冈绿茶中原花青素得率的影响。结果表明,最佳提取工艺参数为:乙醇浓度83%、超声温度58 ℃、超声时间40 min、料液比1:33 g/mL。在此条件下,凤冈绿茶中原花青素得率为4.798%±0.05%,与模型预测值(4.804%)接近,且其相对误差为1.05%,说明该模型回归项良好,拟合度较好,优化后的工艺条件可行,可以为凤冈绿茶中原花青素的进一步开发利用提供理论依据。     

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.