紫苏抑菌成分的提取工艺研究

研究乙醇浸提法从紫苏中提取抑菌成分--黄酮类化合物和迷迭香酸的优化工艺条件.在单因素实验的基础上,采用正交实验优化其提取工艺,并用NaNO2-Al(NO3),-NaOH显色法和FeSO4比色法分别测定黄酮类化合物和迷迭香酸的得率.确定最佳工艺条件为:90%乙醇为提取剂,提取温度为65℃,提取时间为3h,料液比为1∶50(w/v),紫苏抑菌成分得率为23.63mg/g.     

库拉索芦荟多糖的提取

以库拉索芦荟冻干制品为原料，采用水提法对芦荟多糖的最佳提取工艺条件进行了研究。结果表明，最佳提取工艺条件为：料水比1：50，提取温度50℃，提取时间5h，得率12．09％。     

元宝枫叶总黄酮的提取研究

用乙醇作为溶剂，采用常规浸提法及超声辅助法对元宝枫叶总黄酮的提取进行了对比研究。通过单因素及正交试验结果得到浸提法的优化条件为：溶剂为体积分数50％的乙醇溶液，料液比1g：25mL，提取时间1．5h，浸提温度70℃。按照此条件提取两次，第一次提取率94．16％，第二次1．36％；超声辅助法的优化条件为：溶剂为体积分数50％的乙醇溶液，料液比1g：15mL，提取时间0．5h，浸提温度60℃。按照此条件提取两次，第一次提取率为96．29％，第二次提取率为3．11％．     

桂花总黄酮的提取及抗氧化能力研究

利用溶剂浸提法通过正交试验,探讨从桂花中提取黄酮的最佳工艺条件,通过紫外分光光度法测定桂花中总黄酮的含量,用DPPH法测定其抗氧化能力。试验结果表明：用80％乙醇,浸泡14h,提取时间3h,固液比1：30（W：V）,提取温度70℃时,桂花总黄酮的提取效果最好。最佳提取条件下黄酮的质量分数是13．54％,EC50为1．15g/L。桂花具有较强的抗氧化能力。     

乌饭叶多酚提取工艺的研究

采用醇提法提取乌饭叶多酚类物质,通过单因素及正交试验确定了最佳提取工艺为：浸提温度75℃,乙醇浓度50％,固液比1：40,提取时间2．0h,提取2次。方差分析表明固液比和提取时间对多酚提取效果影响极显著,经确证试验表明该条件下乌饭叶一次提取液中多酚含量达11．36％。     

苦丁茶中熊果酸提取工艺研究

采用正交设计L6（4^5）组合了提取工艺，用高效液相色谱法对不同工艺下熊果酸的提取率进行了测定。确定苦丁茶中熊果酸的最佳提取工艺条件为：以95％乙醇为溶荆，料液比1：12，水浴回流3小时。提取3次，提取率达1．769％。     

生姜皮总黄酮的提取工艺研究

以生姜加工的废弃物生姜皮为原料,提取生姜皮中总黄酮。采用乙醇浸提法,以总黄酮得率为提取指标,通过单因素实验和正交试验研究生姜皮总黄酮的最佳提取工艺。结果表明：生姜皮中总黄酮的最佳提取工艺为乙醇浓度75％、、浸提时间5．5h、浸提温度60℃、料液比1：45,此条件下总黄酮得率0．61％。     

苦荞麦黄酮提取最佳条件的研究

在不同乙醇浓度（30％、60％、95％）,不同固液比（1：8、1：10、1：2）,不同温度（50℃、70℃、90℃）和不同提取时间（1h、2h、3h）等条件下,通过正交实验,对苦荞麦黄酮提取最佳条件进行了研究。结果表明：最佳提取工艺条件是60％乙醇,固液比为1：10,在50℃下振荡提取1h。     

荸荠黄酮提取技术研究

采用分光光度法,研究影响荸荠中黄酮类化合物提取量的多种因素,并通过L9（3^4）正交试验设计优化出提取荸荠中黄酮类化合物的最佳工艺条件。结果表明,荸荠中总黄酮的含量为0．8621％,乙醇提取法的最适工艺参数是浸提剂乙醇浓度60％、提取温度70℃、料液比1：50、浸提时间3．5h。     

正交试验优化紫苏中迷迭香酸的超声波提取法

运用正交试验L9(34)设计方法,研究了紫苏中迷迭香酸的超声波提取法的工艺条件。方法采用硫酸亚铁比色法测定迷迭香酸的含量,确定了最佳工艺条件为:50%的乙醇为提取溶剂、超声时间为45min、料液比为1∶30(w/v),迷迭香酸提取率达3.736%,比以往方法的提取率都要高,效果显著。     

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.     

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     

Contamination of animal feed and food from animal origin with mineral oil hydrocarbons

Oils and fats used for the production of animal feed can become contaminated with mineral oil material originating from gas oils (C₁₈-C₃₅) or synthetic oils (poly alpha olefins, C₂₅ to beyond C₄₅). An important cause is assumed to be the discharge of waste oils, such as motor oil and hydraulic oils. Mineral oil material was analysed by on-line LC-GC-FID directly in the fat or in a raw extract from animal feed or foodstuffs. In Switzerland in summer/autumn 1999 concentrations in oils and fats for feed production were often found to be between 100 and 1000mg/kg. In the feeds, the average concentration was around 100mg/kg with values ranging up to a maximum of 1000mg/kg; few samples were free of contamination. In animal body fat, the average concentration determined in summer 1999 was 25mg/kg, with a maximum of 150mg/kg, although in samples from December 1999, contamination was substantially lower. In the fat phase of eggs, the average concentration was 30mg/kg, with a maximum of 80mg/kg. Paraffin oil is used for feed production, which may account for part of the contamination problem (e.g. eggs).