植酸对腌芥菜的护色保鲜研究

探讨了在不同条件下,异抗坏血酸、植酸保鲜液及其混合液的抗褐变和防霉能力。实验结果表明,异抗坏血酸在空气中几乎没有抑霉效果,真空状态下虽有较好的抑霉作用,但未能阻止腌芥菜明显褐变,而0．2％的植酸保鲜液在有氧或无氧的情况下,均表现出比较理想的抗褐变和防霉特性。     

可食性复合涂膜保鲜剂对延长鲜切苹果货架期的研究

本文主要研究了可食性涂膜剂与抗褐变剂复配后对3℃条件下贮存2周的鲜切苹果的保鲜效果。研究表明：25℃条件下，苹果切块经卡拉胶（0．5％）涂膜剂和乳清浓缩蛋白WPC（5％）涂膜剂处理后，其呼吸强度可分别降低5％和20％，可食性涂膜剂与抗褐变剂复配后，对3℃贮藏2周的苹果切块可明显延长其货架期，在涂膜剂中添加不同的抗褐变剂对苹果切块有良好的护色效果，添加1％CaCl，可增加产品的硬度，同时这些复合保鲜剂可提高苹果切块的感官指标和抑制微生物繁殖，而5％乳清浓缩蛋白＋1％CaCl2＋1％抗坏血酸复合液浸泡苹果切块，3℃条件贮藏2周后保鲜效果最佳。     

采用中草药物复合纸的保鲜效果研究

以具有优良防霉抑菌作用的几种天然中草药为保鲜材料，分别选用中草药熬取液浸果和以中草药粉末复合纸保鲜包装两种形式保鲜。通过与不经任何处理仅以纸包装的对照组对比，试验结果表明，这些中草药具有良好的保鲜效果，尤其是以中草药复合的功能保鲜包装纸，保鲜效果明显，以鸭梨为试验样品，在室温３０℃左右放置３５天以上，样品仍能保持较好的鲜度，营养成份损失不大。     

食品封存除氧剂在食品贮藏保鲜中的应用研究

应用研究表明，除氧封存剂运用于多种食品的贮藏保鲜效果显著。它主要用于防霉、防氧化、防色素变色、抑制褐变、防止虫害等方面     

添加剂对壳聚糖膜保鲜鲜切蒲菜的影响

研究了室温下(20～25℃)添加氯化钙和VC等助剂的壳聚糖对鲜切蒲菜涂膜保鲜效果。结果表明,2%壳聚糖被膜对鲜切蒲菜有较好的保鲜效果,能显著降低鲜切蒲菜的失重率,抑制其褐变,而且壳聚糖被膜中氯化钙和VC等助剂的添加增强了其对褐变的抑制。     

有机红提葡萄高二氧化碳防霉保鲜研究

100多年来,国内外葡萄商业化防霉保鲜均为SO2及其制剂,但是,不适用于有机食品保鲜。试验以新疆有机红提葡萄为试材,研究0℃和2%O2+1%、5%、20%、50%CO2处理的防霉保鲜效果,0℃空气处理为对照,定期检测呼吸强度、多酚氧化酶、丙二醛、相对电导率和褐变指数等指标。研究结果表明:贮藏70d,1%、5%、20%、50%CO2处理的保鲜效果均优于对照,但是,50%CO2处理伤害严重,其中,0℃、2%O2+20%CO2处理最佳,呼吸强度为638.24mgCO2/(kg·h)、多酚氧化酶活力为3.81U,褐变指数为0.24。其好果率为97.2%,对照仅52.1%,可以用于有机葡萄的防霉保鲜。     

D-异抗坏血酸抑制鲜切马铃薯褐变的研究

研究了不同褐变抑制剂对鲜切马铃薯褐变和品质的影响.结果表明：4种褐变抑制剂处理均可不同程度地对PPO和POD酶产生抑制作用.硫化物依然是效果最好的护色剂,D-异抗坏血酸的防褐保鲜效果表现较好.马铃薯的PPO、POD活性很高且两者之间具有相关性,与褐变度数值相吻合.经过褐变抑制剂处理的样品之间品质有差异,但不太明显.     

肉桂酸复配型天然防腐剂在酱腌莱中的应用研究

本文主要研究在无真空包装的前提下,在酱腌菜中添加0．05％的苯甲酸钠、0．05％的山梨酸钾和不同浓度的肉桂酸复配型天然防腐剂,分别在非灭菌和灭菌的包装下将其放入恒温恒湿箱内（T=35℃、R=90％）进行加速实验,对比三种防腐剂对酱腌菜的防腐保鲜效果。结合感官检查、菌落计数和大肠杆菌计数发现：肉桂酸复配型天然防腐剂对酱腌菜有明显的防腐保鲜效果,无真空包装下,肉桂酸复配型天然防腐剂对酱腌菜的防腐保鲜效果一般为苯甲酸钠的10-20倍,为山梨酸钾的5～10倍左右;在灭菌条件下添加量为0．2％时,保存84d仅有轻微颜色发暗的现象,酱腌菜的质地、口感和气味均无明显的变化。     

异抗坏血酸与氯化钙联合处理对鲜切芒果的保鲜效果

为研究异抗坏血酸与氯化钙联合处理对鲜切芒果保鲜效果的影响,鲜切芒果在1 g/100 mL异抗坏血酸和0.5 g/100 mL氯化钙的混合溶液中浸渍处理5 min后,4℃相对湿度80%条件下贮藏15 d,每天取样测定呼吸速率,每3 d测定细胞膜相对渗透率、硬度、可滴定酸、类胡萝卜素、抗坏血酸(AsA)、总酚、褐变指数、超氧阴离子(O₂-·)产生速率、抗氧化酶及多酚氧化酶(PPO)活性等指标。结果表明:与对照相比,异抗坏血酸+氯化钙联合处理使鲜切芒果的呼吸峰值降低了41.20%,并延缓相对渗透率升高和硬度下降;保持较高的类胡萝卜素、AsA含量,维持总酚含量相对稳定,在贮藏前期保持了较高的可滴定酸含量,减少褐变发生;降低了O₂-·产生速率,明显抑制PPO的活性,提高超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)的活性,并且在0~9 d时延缓过氧化物酶(POD)的下降,但在贮藏后期降低了POD的活性。以上结果表明异抗坏血酸+氯化钙联合处理可以保持鲜切芒果较好的贮藏品质,延缓膜透性增加并提高活性氧(ROS)的清除能力,从而延缓衰老,抑制褐变。     

小麦胚芽蛋白糖基化产物抗氧化特性研究

目的：探究小麦胚芽蛋白糖基化产物的抗氧化特性。方法：采用超声波辅助湿热法制备小麦胚芽蛋白（WGP）与葡萄糖（Glucose）的糖基化产物（WGP-G），通过测定不同超声时间（10，20，30，40，50，60 min）、不同反应温度（70，80，90 ℃）下WGP-G的褐变程度、接枝度、还原能力、羟自由基清除能力、超氧阴离子自由基、DPPH自由基清除能力和ABTS⁺自由基清除能力等指标，综合评价糖基化反应对WGP抗氧化能力的影响。结果：WGP-G褐变度随超声时间和反应温度的不断增大而增大，接枝度、还原能力、羟自由基清除能力、超氧阴离子自由基清除能力、DPPH自由基清除能力和ABTS⁺自由基清除能力均随反应温度的不断增大而增大，但随超声时间的延长呈先增大后减小趋势。结论：超声时间和反应温度均能影响WGP-G的抗氧化特性。     

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).