压榨制取工艺过程对花生油氧化稳定性的影响

研究压榨工艺、脱胶方法、添加天然抗氧化剂对花生油的抗氧化作用。实验结果表明,毛油经滤纸抽滤后氧化稳定性提高,但进一步脱胶脱出磷脂后氧化稳定性大大降低。迷迭香提取物和没食子酸对花生油均较好的抗氧化作用,以0.07%迷迭香提取物和0.04%没食子酸复配的天然抗氧化剂可有效提高花生油的氧化稳定性。     

天然抗氧化剂对食用油氧化稳定性的研究

文章以花生油为研究对象研究了不同天然抗氧化剂对食用油的抗氧化作用,选用茶多酚、大豆磷脂、迷迭香提取物3种天然抗氧化剂以及大豆磷脂与没食子酸复配、迷迭香提取物与没食子酸复配的联合天然抗氧化剂,采用烘箱加热进行加速试验,研究它们对花生油氧化稳定性的影响,通过测量过氧化值(POV)评价油脂氧化的稳定性,研究结果表明:茶多酚、大豆磷脂、迷迭香提取物均能增强花生油的氧化稳定性,它们抗氧化活性的大小顺序依次为:迷迭香、茶多酚、大豆磷脂。并以此基础上复配的复合抗氧化剂均比单种抗氧化剂的抗氧化效果更好,其中以0.07%迷迭香提取物与0.04%没食子酸复配的复合抗氧化剂效果最好。     

天然抗氧化剂对葵花籽油抗氧化作用的研究

研究天然维生素E、抗坏血酸、大豆磷脂、β-胡萝卜素、茶多酚、没食子酸、迷迭香提取物七种天然抗氧化剂对葵花籽油的抗氧化活性。研究结果表明:七种天然抗氧化剂对葵花籽油均具有一定的抗氧化活性,其中茶多酚、没食子酸和迷迭香提取物具有较好的抗氧化效果;对没食子酸和迷迭香提取物进行复配得出最佳质量比为4∶1;复合抗氧化剂最佳添加量为0.02%。     

迷迭香提取物抗鱼油氧化酸败的研究

以罗非鱼鱼油为原料,主要研究了迷迭香提取物的优化对鱼油的抗氧化作用,选用大豆磷脂、天然维生素E、没食子酸中抗氧化性能较好的一种与迷迭香提取物进行复配。研究结果表明:天然香辛料迷迭香提取物及其它三种天然抗氧化剂都对鱼油有一定的抗氧化活性,其中添加量为0.04%的迷迭香提取物和0.02%的没食子酸对鱼油有很好的抗氧化效果,且二者的抗氧化能力均与浓度成正比。以迷迭香提取物按60%的比例与没食子酸进行复配,复配添加量为0.025%时抗氧化效果最好。     

迷迭香脂溶性提取物在花生油中抗氧化性能研究

本文将化学抗氧化剂BHA+BHT和迷迭香脂溶性提取物鼠尾草酸及熊果酸+齐墩果酸添加至花生油中,经过20天高温加速氧化实验,测定花生油过氧化值、共轭二烯和酮类物质生成量、DPPH自由基清除率、ABTS自由基清除率、脂肪酸组成及非皂化物组成变化等指标,考察抗氧化剂对花生油抗氧化性的影响。结果显示：油样过氧化值和共轭二烯值的增长幅度大小顺序：无添加﹥熊果酸+齐墩果酸﹥BHA+BHT﹥鼠尾草酸,鼠尾草酸抑制花生油中过氧化物和共轭二烯类物质生成的效果最显著;不饱和脂肪酸含量下降幅度大小排序：无添加﹥熊果酸+齐墩果酸﹥BHA+BHT﹥鼠尾草酸,鼠尾草酸抑制不饱和脂肪酸的氧化作用最明显;花生油中8种非皂化物成分呈先上升后下降的趋势,在20天高温贮藏阶段并没有明显被消耗;油样DPPH自由基清除率下降幅度大小顺序：无添加﹥熊果酸+齐墩果酸﹥BHA+BHT﹥鼠尾草酸,鼠尾草酸减缓DPPH自由基清除率的下降速率最显著;油样ABTS自由基清除率下降幅度大小顺序：熊果酸+齐墩果酸﹥无添加﹥BHA+BHT﹥鼠尾草酸,鼠尾草酸减缓ABTS自由基清除率下降的速率最有效。综上可知迷迭香提取物鼠尾草酸对保持花生油抗氧化性的能力显著优于化学合成抗氧化剂BHA+BHT,而迷迭香提取物熊果酸+齐墩果酸抗氧化效果略逊于化学合成抗氧化剂。该研究可为迷迭香抗氧化剂在花生油及其它油脂产品生产中的推广运用奠定基础,为企业研究植物油新型抗氧化剂、实现迷迭香资源的综合利用提供参考。     

赤芍抗氧化活性及其成分研究(英文)

利用DPPH法、β-胡萝卜素法和还原力法评估赤芍提取物的抗氧化活性。结果显示乙酸乙酯提取物具有最高的抗氧化活性。利用硅胶,RP-18和Sephadex LH-20对其进行活性追踪分离,得到四种纯的抗氧化活性成分。利用1D、2DNMR和ESI-MS对其结构进行鉴定。结果显示为没食子酸、儿茶精、没食子酸芍药甙和没食子酸氧化芍药甙。其抗氧化活性均大于同浓度的人工合成抗氧化剂BHT。实验证明赤芍及其提取物是一种高效价廉的天然的抗氧化剂,可用作食品添加剂。     

迷迭香提取物对紫苏籽油的抗氧化研究

为研究迷迭香提取物能否替代人工合成抗氧化剂,成为紫苏籽油的天然抗氧化剂。以过氧化值和酸价为评价指标,采用Schaal烘箱法研究迷迭香提取物对紫苏籽油的抗氧化作用,并与市面上常用的人工合成抗氧化剂(2,6-二叔丁基对甲苯酚、丁基羟基茴香醚、2-叔丁基对苯二酚)作为对照,测定氧化作用后油样过氧化值及酸价,对比它们在紫苏籽油中的抗氧化效果。采用高效液相色谱法(HPLC)检测紫苏籽油样中鼠尾草酸含量,研究鼠尾草酸含量与紫苏籽油的抗氧化作用的相互影响。结果表明:迷迭香提取物在紫苏籽油中具有良好的抗氧化效果,选择0.08%迷迭香提取物作为在紫苏籽油抗氧化保护的最佳添加量;相比于2,6-二叔丁基对甲苯酚、丁基羟基茴香醚、2-叔丁基对苯二酚,迷迭香提取物为仅次于2-叔丁基对苯二酚的紫苏籽油中最高效的天然抗氧化剂;确定鼠尾草酸是迷迭香提取物中的主要抗氧化有效成分中的一种。     

天然调味香料鼠尾草开发应用的研究进展

鼠尾草是常用的香辛料和中草药,不仅可以调味,使食物具有特殊香气,还具有抗菌、消炎、抗衰老等生物活性。近些年,鼠尾草较高的抑菌和抗氧化性能逐渐受到人们的关注,并作为天然的抗氧化剂和抑菌剂应用在食品中。文章综述了国内外对鼠尾草的研究成果,从鼠尾草的化学成分、鼠尾草提取物的制备方法、鼠尾草及其提取物的应用研究3个方面进行论述,以期提高我国消费者对鼠尾草的认识,为鼠尾草的开发应用提供参考。     

鼠尾草提取物对腊肉品质和抗氧化性能的影响

利用鼠尾草提取物作为天然抗氧化剂,在腊肉加工过程中进行喷淋,以期能够控制腊肉的脂质过度氧化,提高产品品质。通过感官评定、过氧化值测定和脂肪氧化程度测定实验考察鼠尾草提取物的添加对腊肉品质和抗氧化能力的影响。感官评定实验显示鼠尾草提取物的添加可提高腊肉的色泽,使其保持较好的红度和亮度,还可提高腊肉的口感,降低腊肉的硬度,但腊肉独特的香味略微减淡。过氧化值测定和脂肪氧化程度测定实验显示鼠尾草提取物的添加可明显提高腊肉的抗氧化能力,并且随着提取液浓度的增加抗氧化能力逐渐增强。综合所有实验结果,鼠尾草提取物的最佳喷淋浓度为0.1g/m L,即用0.1g/m L鼠尾草提取液喷淋制备的腊肉具有较高感官品质的同时还可以明显提高腊肉的抗氧化能力。     

天然抗氧化剂的增效作用及其对花生油抗氧化效果研究

对迷迭香提取物、茶多酚、植酸、VE、抗坏血酸棕榈酸酯在花生油中的抗氧化性能和五种天然抗氧化剂相互之间的增效作用进行了研究。通过Rancimat法测定了添加各种抗氧剂的花生油的诱导时间,根据正交实验结果,各种天然抗氧化剂在组分中的主次因素为迷迭香提取物>茶多酚>植酸>抗坏血酸棕榈酸酯,优化得出天然抗氧化剂的复配配方为迷迭香提取物0.07%、茶多酚0.03%、植酸0.02%、抗坏血酸棕榈酸酯0.02%。此配方对花生油的抗氧化能力优于TBHQ。     

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.