超临界CO2萃取冷破碎苹果皮蜡质工艺优化及其成分分析

以冷破碎苹果皮渣为原料,研究超临界CO2萃取苹果皮蜡质的工艺条件,并用气相色谱-质谱联用技术(GC-MS)分析苹果皮蜡质的化学组成。结果表明:超临界CO2萃取苹果皮蜡质的最佳工艺条件为:萃取压力35MPa,萃取温度50℃,萃取时间1.5h,原料粒度>100目,该条件下萃取率为2.081%;用GC-MS检测到萃取物中36种化合物,其中主要成分是饱和烷烃和酯类,这两类物质的相对含量分别为41.44%和37.41%;其次,苹果皮蜡质还含有醇类、脂肪酸、酮类、β-谷甾醇、木栓酮等成分。     

胡萝卜干渣中类胡萝卜素的超临界CO2萃取技术研究

从胡萝卜加工废弃物综合利用角度出发,开展了超临界CO2流体萃取胡萝卜干渣中类胡萝卜素的技术研究。结果表明,无夹带剂情况下,胡萝卜干渣中类胡萝卜素的一次性萃取率达到54.00%,其萃取条件为:物料粒度为100目,萃取压力40MPa,萃取温度50℃,CO2流量1.0mL/min,萃取时间1h。     

超临界CO2萃取蔗皮中二十八烷醇工艺研究

采用萃取温度、萃取压力和萃取时间的单因素实验和3因素3水平正交实验优化了超临界CO2萃取蔗皮二十八烷醇的工艺条件,并用气相色谱法对二十八烷醇含量进行测定.结果表明,最佳萃取工艺条件为萃取压力30 MPa,萃取温度45℃,萃取时间为4 h.萃取物中二十八烷醇的浓度为42.51 μg/mL,含量为53.14 mg/g.     

薰衣草精油萃取工艺的研究

通过超声波辅助萃取、超临界CO2流体萃取和微波辅助萃取薰衣草精油的正交实验,分别考察了影响薰衣草精油萃取的主要因素,寻求最佳萃取工艺条件.研究结果表明,超临界CO2流体萃取的最佳工艺条件为:萃取时间160min,萃取压力20MPa,流量15L/h,萃取温度45℃,在此条件下精油得率为4.497%.微波萃取的最佳工艺条件为:以正己烷为萃取剂,微波功率700W,溶剂用量200mL,辐射时间350s和洗涤剂用量40mL,在此条件下得率为2.60%.超声波辅助溶剂萃取的最佳工艺条件为:物料粒度40目,料液比1∶ 12,超声时间30min,在此条件下得率为1.09%.综合考虑,超临界CO2流体萃取技术为萃取薰衣草精油的最佳选择.     

超临界CO2流体技术萃取花生油的工艺优化

采用超临界CO2流体萃取技术提取花生油.通过单因素实验及正交实验研究了萃取压力、萃取温度、CO2流量和萃取时间等因素对油脂萃取率的影响,确定了超临界CO2流体萃取技术提取花生油的最佳工艺条件.结果表明,在实验范围内各影响因素对花生油萃取率作用的大小顺序依次为:萃取压力>萃取温度>CO2流量>萃取时间.超临界CO2流体萃取技术提取花生油的最佳工艺参数为:萃取压力25MPa,萃取温度45℃,CO2流量18kg/h,萃取时间150min,在该工艺条件下花生油萃取率达到49.87%.     

不同萃取条件对麦胚中天然维生素E的SFE-CO_2提取的影响

研究以小麦胚芽为试验材料 ,利用超临界流体萃取技术从麦胚中提取了天然维生素E。结果表明 :麦胚中天然维生素E的超临界CO2 适宜萃取条件为萃取压力 2 8～ 35MPa、萃取温度 40～ 45℃、CO2 流量 2mL/min、萃取时间 90min。     

超临界CO_2流体萃取米糠油研究

通过超临界CO2流体萃取米糠油研究,总结萃取压力、萃取温度、萃取时间和物料水分含量对米糠出油率影响。结果表明,最适宜萃取条件为:萃取压力30 MPa、萃取温度45℃、萃取时间80 min、物料水分含量为5％～6％,出油率达14．32％;同时测定超临界CO2流体萃取米糠油中脂肪酸甘油酯组成,得出油酸甘油酯、亚油酸甘油酯和棕榈酸甘油酯占总脂肪酸甘油酯90％以上,其中,油酸甘油酯和亚油酸甘油酯占总脂肪酸甘油酯70％以上;通过超临界CO2法与压榨法比较,超临界CO2流体法萃取米糠油不饱和脂肪酸含量较高,理化指标也优于压榨法,因萃取温度低,防止提取过程中油脂氧化,因此超临界CO2流体萃取是一种较好提取米糠油方法。     

甘蔗天然活性高级醇的超临界流体提取制备与分析

利用超临界CO2流体技术提取甘蔗皮渣中甘蔗天然活性高级醇,为甘蔗天然产物无污染提取分离提供技术参考.试验优化不同萃取工艺条件,得出最适条件为萃取压力25 MPa,温度50℃,时间4 h.通过GC-MS定性定量分析,萃取物纯度高达85%以上,主要成分为C22以上的高级脂肪醇与植物甾醇组分.高级脂肪醇以C22～C30偶碳高级脂肪醇为主,其中以二十八烷醇含量最高,达45%左右;植物甾醇以麦角甾醇和豆甾醇衍生物形式存在,含量为6.33%～8.66%.试验工艺流程简易,所萃取出的甘蔗天然活性高级醇纯度较高,可为保健食品和制药行业提供天然添加辅料.     

翅果油超临界CO2流体萃取工艺优化及其不同提取方法的比较

对翅果油的超临界CO_2流体萃取工艺条件进行研究。在单因素试验的基础上,以萃取压力、萃取温度、萃取时间和原料粒度为影响因素,以翅果油得率为指标,采用正交试验优化工艺条件。比较了浸出法、超临界CO_2流体萃取法、冷榨法和热榨法4种不同提取方法对翅果油得率和微量活性成分的影响。结果表明:超临界CO_2流体萃取翅果油最优工艺条件为萃取压力30 MPa、萃取温度50℃、萃取时间150 min、原料粒度80目,此条件下翅果油得率为(28. 32±1. 15)%; 4种提取方法中,浸出法的翅果油得率、VE及甾醇含量最高,其次是超临界CO_2流体萃取法,除热榨法的翅果油角鲨烯含量最高外,压榨法的其他指标均最低。     

超临界CO2萃取槟榔生物工艺研究

以槟榔生物碱萃取量为主要考查指标,对超临界二氧化碳萃取槟榔生物碱的三个主要影响因素:萃取温度、萃取压力和时间进行研究.试验结果表明:萃取温度对超临界流体萃取槟榔生物碱的影响显著,萃取压力和时间与槟榔生物碱萃取量成正比关系,但对其影响不显著.通过正交试验分析确定最佳萃取工艺:超临界萃取压力为60MPa,萃取温度为60℃,萃取时间为90min.并通过高效液相色谱分析检测槟榔萃取物中槟榔碱的百分含量.结果表明:在此工艺条件下,槟榔生物碱萃取量平均为5884.64μg/g,所得萃取物中槟榔碱的百分含量平均为29.77%.     

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).