超声波辅助复合酶法提取松茸多糖的工艺研究

以松茸多糖得率为评价指标,采用单因素试验和正交试验,确定最佳提取工艺参数。结果表明,超声波提取优化工艺条件为超声温度90 ℃,料液比1∶15（g∶mL）,超声时间10 min。在此最佳超声提取条件下松茸多糖得率为11.18%。在超声波优化结果的基础上,进行复合酶处理,最佳酶解工艺参数为酶解温度50 ℃,酶解时间60 min,复合酶（木瓜蛋白酶∶纤维素酶∶果胶酶为1∶1∶1）添加量4.0%,酶解pH值6.0,此优化条件下松茸多糖得率为19.56%。复合酶超声辅助法比超声波法提取松茸多糖提高了8.38%。结果表明,复合酶超声辅助提取法提取松茸多糖是一种科学有效的方法,可显著提高松茸多糖得率。     

超声波辅助提取莲子皮多糖工艺优化

以莲子皮为原料,研究其多糖的超声波辅助提取工艺条件.采用单因素试验和正交试验,探讨液料比、提取时间、超声功率、提取次数对莲子皮多糖提取率的影响.并以多糖提取率为评价指标,优化提取工艺.试验结果表明:超声波辅助提取莲子皮多糖的最佳工艺条件为液料比30:1,提取时间为30 min,超声功率为60 W,提取次数为4次.在此条件下,多糖提取率为17.37%,多糖质量分数为63.75%.     

均匀设计优化超声协同酶法提取平菇多糖工艺

利用均匀设计法对超声波辅助纤维素酶提取平菇多糖的工艺进行优化。选取pH值、提取温度、液料比、加酶量、酶解时间、超声功率及超声时间7个因素进行单因素试验,在单因素试验的基础之上选择各个因素的较优水平,按照U18(95×62)的混合均匀设计进行试验,考察各因素及其交互作用对平菇多糖得率的影响,预测和验证最佳工艺参数。结果表明:超声波辅助纤维素酶提取平菇多糖的最佳工艺为:超声功率120 W,提取温度25℃,液料比221(mL/g),pH 7.5,加酶量0.5%,酶解时间6 min,超声时间69min。在该条件下,平菇多糖得率为(36.71±0.46)%,该方法提取平菇多糖工艺简单可行,得率高。     

何首乌中多糖的提取及清除羟自由基性能研究

本实验探讨了何首乌多糖的提取纯化及其粗多糖对羟自由基的清除能力。考察了影响何首乌多糖的提取的工艺条件,分别对提取料液比,提取温度,提取时间进行了研究。在此基础上利用响应面分析法确定最佳工艺条件为,料液比1:12,温度为84℃,时间为105min,提取次数两次。此条件下多糖得率可达19.14%。而后,测定了经初步纯化的粗多糖清除羟基自由基功能,得到其IC50为0.27mg/ml。     

超声波辅助提取浒苔多糖的工艺研究

目的：优选超声波法辅助提取浒苔多糖的工艺条件。方法：在单因素试验的基础上,采用正交设计,对超声波辅助提取浒苔多糖的工艺条件进行优选。结果：优选的浒苔多糖超声波辅助提取工艺条件为超声波功率800W、超声处理时间45min、料液比1∶30,浒苔多糖的提取率为27.99%;超声处理的三因素中,处理时间影响最大（P〈0.01）,其次是超声波功率（P〈0.05）;超声波辅助提取法比单纯热水浸提法,浒苔多糖得率提高了2倍,提取时间缩短了60%。结论：超声波法辅助提取浒苔多糖具有操作简便、多糖提取率高、提取时间短的优点,在浒苔多糖产业化生产中有应用前景。     

超声波辅助热水浸提香菇多糖响应面优化工艺及其抗氧化活性的研究

采用响应曲面对超声波辅助热水浸提香菇多糖提取条件进行优化,优化后的工艺为:水料比37:1,超声功率550 W,超声时间7.3min,多糖得率实际测定值为20.58%,与模型预测值22.37%接近,表明用响应面方法来优化香菇多糖提取工艺是可行的.与传统的热水煎煮工艺相比,采用超声波辅助热水浸提的方法提取香菇多糖,可使多糖...     

小组合设计优化超声辅助酶法提取黑玉米粗多糖

为优化黑玉米多糖的超声辅助酶提取工艺,应用小组合试验设计,采用响应面法对提取工艺条件进行优化,确定黑玉米粗多糖超声辅助酶提取工艺的最佳条件:超声作用时间33 min,提取温度59℃,纤维素酶添加量1.23%,中性蛋白酶添加量0.93%,在此条件下多糖得率达46.01%,所建立的数学回归模型能够较准确预测黑玉米多糖的得率。     

超声波辅助优化香菇多糖的提取工艺

以香菇为原料,利用超声波辅助提取香菇多糖,以多糖提取率为评价指标,通过单因素试验和正交试验研究探讨料液比、超声功率、温度、超声时间对香菇多糖提取率的影响。试验结果表明：超声波辅助提取香菇多糖效果较好,最佳提取工艺条件为料液比1∶50（g/mL）,超声功率300 W,提取温度50℃,超声时间40 min。在最优提取工艺条件下经过3次平行试验,香菇中多糖提取率为11.73%     

超声波辅助提取桦褐孔菌子实体中多糖的工艺优化

研究了优化超声提取桦褐孔菌中多糖的工艺.以蒸馏水为提取剂,用超声波辅助提取桦褐孔菌多糖类物质,以不同处理条件、超声功率、超声次数、超声处理时间为试验因素,以多糖的提取率为考察指标进行单因素试验确定最佳提取工艺.超声辅助技术提取桦褐孔菌子实体中多糖类的最佳工艺条件为:超声功率400W,超声20次,超声10min,在此条件下,多糖得率最高,为11.62％.     

超声波辅助提取桦褐孔菌子实体中多糖和三萜

研究了优化超声辅助提取桦褐孔菌中多糖和三萜类物质的工艺。以蒸馏水和异丙醇为提取剂,用超声波辅助提取桦褐孔菌多糖和三萜类物质,以不同处理条件、超声功率、超声次数、超声处理时间为试验因素,以多糖和三萜的提取率为考察指标进行单因素实验确定最佳提取工艺。超声辅助技术提取桦褐孔菌子实体中多糖类和三萜类物质的最佳工艺条件为:超声功率400 W、超声20次、超声10 min,在此条件下多糖得率最高,为11.62%,总三萜类物质得率在2%,使得多糖和三萜类物质二者共提取得率达到13.57%。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

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.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

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.