高温下芝麻素抗氧化性的研究

为开发利用芝麻素天然食品抗氧化剂,系统研究了芝麻素热稳定抗氧化活性。研究结果表明:在高温下,芝麻素具有良好的抗氧化性,对猪油和菜籽油抗氧化效果高于同浓度的对照组,磷酸对芝麻素在猪油中的抗氧化活性有显著的增效作用,并对由金属离子(Cu2 、Fe2 )引起的促氧化作用有明显的抑制效应。     

HPLC法测定芝麻油中芝麻素的含量

芝麻素是木脂素类化合物中的一种，具有消除体内自由基、降低血清中胆固醇等多种生理活动功能，主要应用于保健品和医药领域。对芝麻素的检测主要有薄层色谱法(TLC)、气相色谱法(GC)、高效液相色谱法(HPLC)。本文研究了以芝麻油为原料，采用氧化铝层析柱预处理得到芝麻素混合物，再用高效液相法进行含量的检测。     

芝麻油中芝麻素提取物的纯化与检测

为了开发芝麻油中的生物活性物质芝麻素,采用乙醇[芝麻油∶溶剂为1∶2(V/V)]对芝麻油中芝麻素类物质进行提取,经过脱除溶剂等过程制备芝麻素粗品,而后采用丙酮-异丙醇对芝麻素粗品进行纯化.并对纯化的不同条件,包括温度、溶剂量、时间等因素,进行了比较,确定在料液比为0.8∶1,45℃下搅拌40 min,芝麻素物质得率达到0.24%,产品熔点为119.0～120.5℃,HPLC分析芝麻素物质相对含量达到94%.     

芝麻饼粕中芝麻素的分离提取与HPLC分析

探索一种从芝麻饼粕中分离、提取高纯度芝麻素的有效方法,为芝麻素的生物功能研究及其在生物医药领域的进一步开发应用奠定良好的基础.以芝麻饼粕为原料,以料液比、温度和浸提时间为观察因素,采用正交试验进行提取条件的优化.然后对提取的芝麻素粗品进行结晶纯化,并以高效液相色谱法测定芝麻素的含量.正交试验表明,最佳的提取条件为:料液比1.4.5(g/mL),温度加℃,浸提时间6h.经验证试验,在此提取条件下芝麻素粗品的提取率可达到88.3%.高效液相色谱法测定结果显示,芝麻素粗品和芝麻素纯化结晶的含量分别达到7013%和95.6%.本试验通过正交试验确定一种芝麻饼粕中芝麻素分离提取的优化工艺条件,得到较高纯度的芝麻紊纯化结晶.     

响应面优化芝麻粕中芝麻素酚三糖苷的提取工艺

以芝麻粕为原料,利用超声波辅助提取芝麻素酚三糖苷。在单因素试验的基础上,以芝麻素酚三糖苷得率为响应值,通过响应面法对芝麻粕中芝麻素酚三糖苷的提取条件进行优化。结果表明:芝麻素酚三糖苷最优提取条件为超声功率1 220 W、提取液pH 7. 7、磁力搅拌转速430 r/min、超声波作用方式为连续,此条件下芝麻素酚三糖苷得率为(4. 31±0. 03) mg/g。     

芝麻素在大豆油中抗氧化活性的研究

研究对芝麻素在大豆油中的抗氧化活性进行了研究,采用过氧化值和共轭双烯值作为指标,将芝麻素的抗氧化活性与VE、TBHQ(特丁基对苯二酚)进行了比较,并研究了芝麻素与VE、增效剂CA(柠檬酸)及EDTA的协同抗氧化作用。研究结果表明,芝麻素具有较强的热稳定性和抗氧化活性,其抗氧化活性随芝麻素浓度的增加而增加;芝麻素在大豆油中的抗氧化活性略高于同浓度的VE,但明显低于同浓度的TBHQ;增效剂CA(柠檬酸)对芝麻素的抗氧化活性增效明显。     

芝麻木酚素“芝麻素”研究概况

概述芝麻中包括芝麻素、表异芝麻素、芝麻林素、芝麻素酚、芝麻林素酚、松脂醇、芝麻酸等木酚素类化合物,特别介绍对芝麻素的生理功能研究进展概况。     

读者信箱

芝麻油又名香油,香味浓郁,诱人食欲,是其他的植物油所难以比拟的.尤其是小磨香油,更别有一番清雅幽香.据科学家分析,香油的这些香气味,主要来自芝麻籽里含有的微量芝麻素.芝麻素本身也并无挥发性香味,而是在榨油炒芝麻时,芝麻素分解为芝麻酚和一些芳香族化合物,芳香环上具有羟     

芝麻素的超声辅助提取工艺优化

以黑芝麻为原料,乙醇为提取溶剂,采用超声辅助提取法提取芝麻素。通过单因素试验考察了乙醇体积分数、料液比、超声功率、提取温度及提取时间对芝麻素提取率的影响,并通过响应面法优化了芝麻素的提取工艺条件。结果表明：超声辅助提取芝麻素的最佳工艺条件为乙醇体积分数60%、料液比1∶ 15、超声功率300 W、提取温度57.0 ℃、提取时间2.3 h,在最佳工艺条件下芝麻素提取率为0.449 6%。研究结果为芝麻素的开发及利用提供了理论依据。     

芝麻油中芝麻素含量测定的研究

采用先皂化芝麻油,然后用石油醚萃取不皂化物,再用甲醇溶解定容不皂化物的前处理方法,利用高效液相色谱法测定芝麻油中芝麻素的含量.色谱柱为GL Sciences(ODS -3,250 mm×4.6mm,5μm),流动相为甲醇-水(体积比为80∶20),流速1 mL/min,检测波长287 nm,柱温40℃.所得芝麻素的保留时间为8.5 min,芝麻素的平均加标回收率为99.3％(RSD=1.89％),精密度为0.77％.建立的方法能简便、快速、准确测定芝麻油中芝麻素含量.     

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).