响应面法优化柑桔皮总黄酮提取工艺的研究

为确定柑桔皮中总黄酮的最优提取条件,提高提取得率,在单因素试验的基础上,采用三元二次回归正交旋转组合设计,研究在自然pH条件下微波功率、液料比、微波处理时间对黄酮产量的影响,建立各因子与黄酮产量关系的数学回归模型.试验结果表明:最佳提取条件:微波功率576 W、液料比48:1、微波处理时间194s.经试验验证,在此条件下提取2次,黄酮得率(3.38±0.09)%(n=3),与理论计算值3.490735%基本一致.回归模型能较好地预测柑桔皮中总黄酮的提取得率.     

超声波/微波法提取银杏叶总黄酮的对比研究

对超声波和微波两种不同提取银杏叶中总黄酮的方法进行了研究,并对两种方法的最佳操作条件进行了正交试验,测定了银杏叶中总黄酮的含量。试验结果表明：超声波提取法较微波法提取率高,提取率为24.35%,比微波法高8.80%。超声波提取总黄酮的最佳操作条件是用无水乙醇浸提,料液比为1∶10,超声时间为20min,温度10℃。微波法提取总黄酮的最佳操作条件是无水乙醇浸提,料液比为1∶10,时间150s,功率为低档。     

微波萃取在菊花黄酮提取工艺中的应用研究

在微波单因素提取的基础上采取L9(34)正交优化试验,探讨乙醇浓度、微波提取时间和料液比对菊花黄酮提取率的影响.经过单因素试验及正交试验,结果表明:影响菊花黄酮微波提取的主要因素为乙醇浓度,其次为提取时间、料液比.在微波功率300 W的条件下,最佳提取工艺条件为乙醇浓度60%,提取时间120 s,料液比1∶20.此时总黄酮提取率为4.83%.     

超声波辅助提取杨梅果实中黄酮类化合物的工艺研究

采用超声波法提取杨梅果实中的总黄酮,在考察乙醇浓度,提取时间、料液比、pH值四个单因素进行的基础上,通过正交试验确定了最佳提取工艺:乙醇浓度为70%,提取时间为30min,料液比为1:10,提取溶剂pH值ha.在最佳条件下提取,黄酮含量为3.023 mg/g.与传统回流提取法相比较,超声波提取具有速度快,提取率高,操作简便等优点.     

微波技术在杜仲黄酮提取工艺中的应用研究

本文在微波单因素浸提的基础上,采取L9（34）正交优化试验,以探讨微波功率、乙醇浓度、料液比和提取时间对杜仲黄酮提取率的影响研究.单因素试验结果表明：最佳萃取工艺参数为,微波功率200W,乙醇浓度为50%,液料比为1∶30,提取时间10min.正交试验结果表明：影响杜仲微波浸提的主要因素为乙醇浓度,其次是提取时间、料液比、微波功率.最佳提取工艺条件为为A2B3C2D3,即乙醇浓度50%,提取时间25min,料液比1∶30,微波功率400W.此时总黄酮含量为0.7672%.     

超声波提取小叶榕叶总黄酮工艺研究

以小叶榕叶为原料，用正交试验法优化小叶榕叶总黄酮的超声波提取工艺，考察超声波作用时间、超声波功率、液料比和乙醇浓度4个因素对小叶榕叶总黄酮提取率的影响，确定小叶榕叶总黄酮的优化超声波提取工艺条件为：提取溶剂60％乙醇，料液比1：30，超声波功率为240w，超声波作用时间20min。将该法与常规热提取法进行对比。结果表明，超声波提取小叶榕叶总黄酮的提取率比常规热提取的提取率要高，而且超声波提取所用提取时间短，提取溶剂用量少。     

超声波-微波协同萃取芹菜黄酮的工艺研究

研究超声波-微波协同萃取芹菜黄酮的工艺条件.以远红外干燥的芹菜粉为原料,通过单因素和正交试验探讨乙醇浓度、液料比、微波功率、萃取时间及超声波等因素对萃取效果的影响.确定最佳的萃取工艺:80%乙醇为溶剂,液料比30∶1(mL/g),超声波和600 W微波功率协同萃取240 s,芹菜总黄酮和芹菜素提取率分别为1.051%和14.156 μg/g,均高于回流提取6 h时的提取率.     

枣核总黄酮的微波辅助提取工艺优化

目的:采用正交试验法,优选枣核中总黄酮的微波辅助提取工艺。方法:以芦丁为对照品,采用分光光度法进行测定,以枣核黄酮提取率作为考查指标,对影响黄酮提取工艺的因素进行研究。通过单因素试验研究微波功率、提取时间、提取温度、料液比和提取溶剂乙醇体积分数对提取效果的影响。然后,利用正交试验法优化最佳提取工艺条件。结果:对枣核黄酮提取的影响程度大小顺序为料液比>提取温度>提取时间>乙醇体积分数>微波功率,正交试验结果表明最佳提取工艺参数为料液比1:60(g/mL)、提取温度60℃、乙醇体积分数50%、提取时间20min、微波功率500W。在最佳工艺条件下,枣核黄酮粗品的提取产率为10.14%,粗品中黄酮含量为7.0 0%。结论:采用正交试验-微波提取工艺,能显著提高枣核黄酮的提取效率,具有较好的提取效果。     

正交试验法优化超声提取枣核总黄酮

目的:采用正交试验法,优选枣核中总黄酮的最佳超声提取工艺。方法:以芦丁为对照品,采用分光光度法进行测定,以提取液中黄酮含量作为考查指标,对影响黄酮提取工艺的因素进行了研究。首先,通过单因素试验研究了超声波功率、超声提取时间、料液比和提取溶剂乙醇体积分数对提取效果的影响,然后,利用正交试验法优化最佳提取工艺条件。结果:影响枣核黄酮提取的主要因素是乙醇体积分数与超声波功率,正交试验结果表明最佳提取工艺参数为:超声波作用功率是450W、超声波作用时间为30min、料液比1:50、乙醇体积分数50%。在此实验条件下,枣核黄酮粗品的提取率为7.04%,粗品中黄酮含量为1.59%。结论:采用正交试验-超声提取工艺,能有效提高枣核黄酮的提取效率,具有良好的应用前景。     

微波提取藏茵陈总黄酮的工艺

本文用微波提取法提取出了藏茵陈中总黄酮,通过化学方法对藏茵陈中总黄酮进行了定性鉴定,设计了正交试验考察影响总黄酮提取率的4个因素,设计单因子试验确定了这四大因素的最佳提取条件。结果表明：藏茵陈提取液中含有黄酮类化合物;微波提取藏茵陈中总黄酮的4个因素对提取效果影响的次序为乙醇浓度〉微波功率〉微波提取时间〉料液比,最佳的提取工艺为料液比1∶35,乙醇浓度70%,微波功率700W,微波提取时间8min,该工艺条件下总黄酮提取率达5.56%     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

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.     

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 Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

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 latest scientific