快速水分测定仪检测玉米水分的试验研究

恒重法测水分时间长、工效低，不能满足实际工作需要。使用LDS－1H型电脑水分测定仪速度快，但若操作不当，对测定结果影响很大，通过分析检测玉米干燥机出机粮食水分的实践过程和数据，总结快速水分检测仪准确检测粮食水分的注意事项。     

茶叶含水率常用测定方法及比较分析

通过介绍茶叶含水率不同测定方法的基本原理及应用特点,比较分析了各种测定方法的优缺点,提出了茶叶含水率在线检测的技术需求。恒温烘箱法、快速水分测定法、低场核磁共振测定法适用于实验室茶叶含水率(3%~75%)的测定;电阻法适用于高含水率(50%~75%)的测定;近红外光谱法、微波法、电容法适用于中低含水率(3%~50%)的测定。近红外光谱法、微波法可考虑用于茶叶含水率的在线实时检测,及时反馈指导茶叶生产具有优越性。     

对SF_6气体中水分的危害与控制探讨

SF6气体具有良好的绝缘性能和灭弧性能,在电气设备中得到了广泛应用。在常态下SF_6气体无色无味,一旦大气中的水分浸入或固体介质表面受潮,则电气强度容易出现明显的下降。水分的存在会对电气设备的安全运行及SF_6气体的电气性能和绝缘性能产生不良影响。文章分析了水分存在的危害以及如何进行防范。     

水分速测法与国标法对比实验研究

利用水分测定仪快速检测方法与国标检测方法进行对比,通过检验原理、检测时间、检验步骤、检验结果准确性进行分析,得出使用水分测定仪在检测冷冻饮品总固形物含量时可以减少技术人员手工操作时间,提高工作效率,该方法具有快捷、简便的优点,可以适用于冷冻饮品中总固形物的检测。     

快速微波水分仪在测定果蔬罐头水分中的应用

目的建立用快速微波水分仪测定果蔬罐头中水分的方法。方法在微波条件下对水分含量高的果蔬罐头进行检测,寻找出测定果蔬罐头水分的最佳条件,检测结果和GB 5009.3-2016《食品安全国家标准食品中水分的测定》直接干燥法检测结果进行比对。结果本方法检测果蔬罐头,样品搅拌均匀下,均匀涂抹到样品垫上的厚度4 mm,所测定的水分含量结果相对标准偏差(relative standard deviation,RSD)值理想,结果再进行F检验计算和t检验计算,所检测结果与直接干燥法检测结果也无显著性差异,结果重现性好、耗时少,能满足快速分析的要求。结论本方法可等效标准检测方法使用,适用于果蔬罐头水分的批量检测。     

ＮＡＳＩＣＯＮ固体电解质材料的溶胶－凝胶合成与ＣＯ２敏感器件研究

以常规试剂为原料，采用溶胶－凝胶法合成了ＮＡＳＩＣＯＮ固体电解质材料，并以该合成材料为基础，制备了小型固体电解质型ＣＯ２传感器，测试表明，所制备的器件对ＣＯ２气体表现出良好的线性敏感特性、快速的响应恢复和较强的抗干扰能力。     

植物性食品原料水分含量检测研究进展

综述了植物性食品原料水分含量检测方法的研究概况,分析了水分含量检测装置、优缺点及应用,总结了水分含量检测在不同类型植物性食品原料中的应用,突出了热风干燥法、微波法、卡尔费休法、绝干氮气吹扫法、光谱技术以及成像技术的优势,并展望了植物性食品原料水分含量检测未来发展的方向。     

食品水分的在线微波测定技术

介绍了水分微波测定技术在食品加工过程中的应用,分析了微波水分检测系统的检测原理、应用特性及其基本的水分检测模型,给出了一种食品干燥过程在线自动水分测控系统的应用实例.     

茶叶水分含量与霉菌污染状况的调查报告

茶叶水分含量与霉菌污染状况的调查报告何雪梅林弟雄车光叶碧莎１９９７－０１－０６收稿（广西食品卫生监督检验所）分类号８３．７１茶叶是广西的农副产品经济支柱之一，也是广大群众生活中必不可少的饮品之一。由于茶叶的吸味、吸湿性强，使其在加工、运输和贮存过程中...     

食品营养强化剂乳酸亚铁中水分含量测定方法探讨

目的通过比较不同水分测定方法,研究适用于食品营养强化剂二水乳酸亚铁和三水乳酸亚铁的方法。方法采用105℃直接干燥法、130℃直接干燥法、真空干燥法和卡尔·费休法测定二水乳酸亚铁和三水乳酸亚铁中水分含量。并比较干燥前后样品的色泽及三价铁含量。结果 105℃直接干燥法、130℃直接干燥法和真空干燥法仅适用于三水乳酸亚铁,对二水乳酸亚铁不适用。卡尔·费休法可以检测出二水乳酸亚铁和三水乳酸亚铁中水分含量。结论与105℃直接干燥法、130℃直接干燥法、真空干燥法相比,卡尔·费休法更适合于二水乳酸亚铁和三水乳酸亚铁中水分含量的测定。建议《食品安全国家标准食品营养强化剂乳酸亚铁》中采用卡尔·费休法测定水分的含量。     

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.