从米糠中制备水溶性膳食纤维的比较研究

研究了直接水浸提法、酶解法、生物发酵法对米糠水溶性膳食纤维得率的影响.结果表明:直接水浸提法、酶解法和生物发酵法水溶性膳食纤维得率分别为10.78%、16.32%和10.28%,酶解法更适合制备水溶性膳食纤维.     

纤维素酶提取水溶性膳食纤维工艺的研究

目的 以番茄不溶性膳食纤维为原料,用酶解法提取可溶性膳食纤维(SDF).方法 经正交试验优化提取工艺,并在优化条件下循环提取.结果 制备SDF的最佳工艺条件为:酶用量10%,酶解时间6 h,酶解温度60℃,pH 4.0,以最佳条件连续反应,产率可达31.1%.结论 确定了酶提取SDF的最佳工艺;证实循环工艺可以提高提取效率.     

豆渣中可溶性膳食纤维提取的研究

以大豆豆渣为原料,先用传统化学方法碱法处理得到大豆可溶性膳食纤维(SDF)和不可溶性膳食纤维(IDF),然后再用改进的酶法处理前一步得到的不可溶性膳食纤维,进一步提取大豆可溶性膳食纤维,并通过单因素试验及正交试验对碱法和酶法条件进行了优化。湿豆渣经烘干、粉碎、碱液水解、酶解、沉淀、干燥后制得膳食纤维。结果表明,碱法制备可溶性膳食纤维的最佳工艺条件是:温度80℃,物料比1∶15,反应时间1.5h,p H13。在此条件下,豆渣中SDF得率为18.2%。碱处理得到的IDF使用复合多糖酶处理法提取可溶性膳食纤维的最佳工艺条件是:温度45℃,物料比1∶15(m∶v),加酶量10.0%,反应时间1.5h,p H4.5。在此条件下,SDF得率为11.09%。     

纤维素酶提取水溶性膳食纤维工艺的研究

目的 以番茄不溶性膳食纤维为原料,用酶解法提取可溶性膳食纤维(SDF).方法 经正交试验优化提取工艺,并在优化条件下循环提取.结果 制备SDF的最佳工艺条件为:酶用量10%,酶解时间6 h,酶解温度60℃,pH 4.0,以最佳条件连续反应,产率可达31.1%.结论 确定了酶提取SDF的最佳工艺;证实循环工艺可以提高提取效率.     

豆渣可溶性膳食纤维酶法制备工艺及其品质分析

为了获得高得率的豆渣可溶性膳食纤维,以碱处理豆渣制备可溶性膳食纤维后剩余的不溶性残渣为原料,采用纤维素酶对其进行酶解改性。通过单因素试验和响应面优化试验,研究了不同酶解条件对豆渣可溶性膳食纤维得率的影响。结果表明:对豆渣可溶性膳食纤维得率的影响因素依次为加酶量>酶解时间>酶解温度>酶解pH,最佳酶解工艺条件为:加酶量1.80%,酶解时间3.5 h,酶解温度48℃,酶解pH4.8。在此条件下,豆渣可溶性膳食纤维得率可达到7.64%,且其品质符合国家粮食行业标准规定的指标。扫描电镜结果表明,酶法制备的豆渣可溶性膳食纤维的颗粒较小,呈现蜂窝状,有利于其水合特性的提高。     

超声辅助酶解法提取豆渣膳食纤维研究

为增加豆渣的附加值,研究豆渣中膳食纤维的酶水解提取工艺.通过超声波辅助脱脂、木瓜蛋白酶脱蛋白、单因素试验和正交试验相结合,详细探讨木瓜蛋白酶用量、酶解温度、酶解时间和溶液pH值对总膳食纤维提取率的影响.结果表明,最佳提取工艺为:木瓜蛋白酶用量0.3%、酶解温度50℃、酶解时间90min、pH值5.0.在此条件下,总膳食纤维产率为62.6%.     

豆渣中可溶性膳食纤维提取工艺的研究

利用醇沉法提取豆渣中的可溶性膳食纤维(SDF),通过单因素试验和正交试验确定了SDF提取的最佳条件并测定其功能指标.研究结果表明,豆渣中SDF提取的最佳条件是提取温度90%,提取时间1.5h,碳酸钠质量分数4%,加压时间1.5h,在此条件下豆渣中SDF的提取率可达52.4%.此时膳食纤维的持水力为3.1990 g/g,膨胀性为6.3894mL/g.     

联合酶法提取豆渣蛋白肽和可溶性膳食纤维

豆渣是大豆加工的主要副产物之一,含有丰富的蛋白质和膳食纤维。为促进豆渣高值化利用,采用联合酶法从豆渣中提取蛋白肽和可溶性膳食纤维（SDF）。首先用碱性蛋白酶酶解豆渣蛋白,以蛋白肽得率为指标,通过单因素试验优化了提取豆渣蛋白肽的工艺条件,再将脱蛋白豆渣用纤维素酶酶解制备SDF,以SDF提取率为指标,通过单因素试验优化提取SDF的工艺条件。结果表明：碱性蛋白酶酶解提取蛋白肽最佳工艺条件为料液比1∶ 35、酶与底物比2%、酶解时间5 h、酶解温度50 ℃、pH 95,在此条件下豆渣蛋白肽得率为66.81%;纤维素酶酶解提取SDF最佳工艺条件为料液比1∶ 30、酶与底物比3%、酶解温度50 ℃、酶解时间2 h、pH 4.0,在此条件下SDF提取率为1554%。利用碱性蛋白酶和纤维素酶依次酶解后,豆渣总利用率达到了89.81%,这为豆渣综合开发利用提供了一种新途径。     

响应曲面法优化豆渣可溶性膳食纤维提取工艺

利用响应曲面法对豆渣可溶性膳食纤维（SDF）的提取条件进行优化。在单因素试验的基础上,根据Box-Behnken中心组合设计原理,选取浸提液pH值、提取温度和提取时间3因素进行响应曲面分析,建立豆渣可溶性膳食纤维提取率的二次多项数学模型。在分析各因素的显著性和交互作用后,得出豆渣可溶性膳食纤维提取工艺的最佳条件为：浸提液pH值4.5、提取温度50℃、提取时间60 min,在该条件下可溶性膳食纤维的得率为36.66%。     

豆渣可食用包装纸的研制

豆渣含有大量纤维素和钙,含有少量脂肪,具有较高的营养价值。为扩大豆渣的利用途径,提高大豆的经济价值,以鲜豆渣为原料,通过研究酶添加量、提取温度、时间、p H对豆渣中可溶性膳食纤维提取的影响,确定最佳条件。结果表明,当酶添加量0.5%、反应时间100 min、反应温度48℃、p H 4.3时提取率最高,为4.56%。将制得的可溶性膳食纤维与海藻酸钠、CMC和甘油按比例混合,以膜抗拉伸强度为指标,探究可溶性膳食纤维、甘油、CMC、海藻酸钠的添加量对豆渣可食用包装纸性能的影响。由正交实验可知当可溶性膳食纤维添加量为2.0%、海藻酸钠1.5%、CMC0.5%、甘油1.5 m L时制得的膜性能最佳,抗拉强度为7.42 MPa。     

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).