金银花中黄酮类物质最佳提取工艺的研究

采用水提法、醇提法、超声波法探讨了从金银花中提取黄酮类化合物的最佳工艺条件。实验结果表明，超声波法的提取效果最好，即在60倍于样重的40％的乙醇浸泡24h，之后再用超声波下提取45min，其黄酮浸出量为16．91％。     

响应曲面法优化微波辅助双水相提取苦荞麦麸皮中黄酮类化合物的工艺研究

采用微波辅助乙醇/硫酸铵双水相体系提取苦荞麦麸皮中的黄酮类化合物,研究微波辅助双水相提取麦麸皮中黄酮类化合物的提取率。通过单因素实验确定微波辅助麦麸皮黄酮双水相萃取的最优萃取条件;酶标仪测定吸光度并计算黄酮得率;响应曲面法优化微波辅助双水相提取苦荞麦麦麸皮总黄酮的提取工艺。研究表明,微波辅助双水相提取麦麸皮中黄酮类化合物的提取率为25.6%;响应曲面法优化微波辅助双水相提取苦荞麦麦麸皮总黄酮的提取工艺,最优工艺条件为萃取剂30%乙醇,取微波功率550W,处理时间为40s,料液比为1∶75,提取率为1.62%。     

柳蒿芽黄酮提取工艺的研究

通过单因素试验和正交试验.确定超声波辅助法及微波法提取柳蒿芽黄酮类化合物的工艺参数.超声波辅助法用柳蒿芽40倍体积的50%乙醇超声波强化处理50 min.在水浴中90℃恒温3 h,黄酮提取率为4.02%.微波法用柳蒿芽15倍体积的70%乙醇微波处理25 s.微波功率640 W,黄酮提取率为3.02%.比较超声波辅助法和微波法提取柳蒿芽黄酮类化合物的工艺条件.超声波辅助法具有简便、易于操作、提取率高和溶剂损失少等优点.     

超声波辅助提取九香虫黄酮化合物的工艺研究

以乙醇为溶剂,以超声波作为提取辅助设备,通过单因子试验确定影响黄酮化合物提取的主要因素及其最佳水平范围,通过L9(34)正交试验确定其最优提取条件,研究超声波辅助提取九香虫黄酮类化合物的最优工艺。最优工艺条件是料液比1:30、提取时间30 min、乙醇浓度70%、提取温度60℃。在最优工艺条件下测得样品中黄酮类化合物的含量达最大,为17.1 mg.g-1。影响超声波辅助提取九香虫黄酮化合物的因素主次为料液比>提取时间>醇浓度>提取温度。     

油茶壳中总黄酮的最佳提取工艺研究

对油茶壳中总黄酮类物质的乙醇提取工艺进行了研究,探讨了影响提取率的主要因素,最后通过正交试验确定了最佳提取工艺,结果表明:在30倍于样重的60%的乙醇浸泡后,40℃下超声波辅助萃取45min,连续提取2次,黄酮的总浸出率可达97.34%,油茶壳中的黄酮溶出量为1.709%.     

响应面法优化荞麦壳总黄酮超声辅助萃取工艺

主要研究超声波辅助萃取荞麦壳黄酮的影响因素并采用响应面法优化超声波辅助萃取荞麦壳黄酮类化合物。通过Placket-Burman试验考察料液比、乙醇体积分数、提取时间、提取温度、提取次数对黄酮提取率的影响,影响最为显著的3个因素进行最陡爬坡试验,确定中心点;Box-Behnken设计得到最优超声辅助萃取荞麦壳黄酮提取条件。荞麦壳黄酮最佳提取工艺为:料液比1∶49.63(g/mL),提取时间60.53 min,提取温度64.70℃,黄酮得率1.58%。考虑到实际可操作性将实际组合定为:料液比1∶50(g/mL),提取时间60 min,提取温度65℃。验证在条件下实际黄酮得率为1.581%。     

槲寄生中黄酮类化合物不同提取工艺的研究

采用超临界C02萃取、回流提取、超声波辅助浸提三种方法提取槲寄生中的黄酮类化合物。结果表明，超声波辅助浸提法总黄酮提取率优于超临界C02萃取法和传统的溶剂回流提取。通过正交试验，得到最佳工艺条件为乙醇体积分数80％，超声时间15rain，溶剂用量40ml／g，此条件下总黄酮的提取率为1．37％。     

无花果叶、番石榴叶中黄酮类化合物的提取与测定

黄酮是治疗糖尿病的重要天然有机成分。选用乙醇冷浸提与超声波相结合的方法提取，进行了条件试验，用70％的乙醇冷浸提12h，料液比选取1：50，超声波额定频率为40kHz，提取时间为40min。并且采用分光光度法测定了无花果叶、番石榴叶中黄酮类化合物的含量，并与国内多个地区银杏叶中黄酮类化合物的含量比较。结果表明：番石榴叶中黄酮类化合物含量为1．27％，无仡果叶中黄酮类化合物含量为0．64％，比银杏叶中的黄酮类化合物含量高。无花果叶、番石榴叶等有待进一步开发。     

响应面法优化红薯叶类黄酮提取工艺的研究

探讨了超声波辅助提取技术提取红薯叶中的类黄酮化合物的最佳工艺,以期为开发利用红薯叶中类黄酮化合物提供参考。选取本地红薯叶为原料,采用超声波辅助提取技术,以乙醇溶液为溶剂,考察乙醇浓度、提取温度、超声波功率、料液比等因素对红薯叶中类黄酮提取效果的影响,并通过响应面分析法确定了超声波辅助提取红薯叶中黄酮类化合物的最佳提取工艺。结果表明:超声波辅助提取红薯叶类黄酮的优化条件为乙醇浓度50%,提取温度60℃,料液比1:25,超声功率353W,该条件下,类黄酮的提取得率可达到9.74%。     

麦胚黄酮的超声提取工艺研究

研究了乙醇提取麦胚中黄酮的超声辅助提取工艺条件。通过正交试验，确定了最佳的工艺条件是乙醇浓度50％，超声波作用时间45min，料液比为1／25。此时提取率为91．39％。     

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%.     

Qingshan Paper Intended to Increase Raised Fund RMB 1.3 Billion to Build Dissolving Wood Pulp Production Base

On April 25th, 2014, Guangdong Guanhao High -Tech Co., Ltd. held the trial production ceremony of the specialty paper and coated paper industry base project （first phase） at the base paper production plant of Donghai Island m     

Two Bag Manufacturers in China Invested by OJI Group Officially Put into Operation

正In September 2013,OJI(Qingdao)Bag Manufacture Co.Ltd.and Wuhan South OJI Packing Co.Ltd.invested by OJI Group in China have put into operation in succession,and the opening ceremony was held on September 4th and 5th respectively.