羧甲基壳聚糖可食用膜在油豆角保鲜中的应用

采用三因素三水平正交实验,来确定NO-羧甲基壳聚糖涂膜保鲜油豆角的保鲜液的最佳配比。结果表明,2.0%壳聚糖、25μg/mL6-BA及0.1g/kg脱氢醋酸钠混合制成的保鲜液,可有效地保持油豆角良好的感官品质。     

壳聚糖在金弹金柑保鲜中的应用研究

以江西遂川金弹[Fortunella Crassifolia Swingle]为原材料,采用壳聚糖复合涂膜方法对其进行保鲜研究.根据正交试验结果,确定金弹涂膜保鲜剂的最佳配方：壳聚糖2.0%,山梨酸钾0.05%,脱氢醋酸钠0.3g/kg,4.0%氯化钙.     

油豆角的涂膜保鲜研究

分析了油豆角(Phaseolus vulgaris L.)的变质原因,分离并初步鉴定了引起油豆角变质的病原菌,在此基础上确定了抑菌效果最佳的抑菌剂;研究了不同配方的壳聚糖保鲜剂对油豆角保鲜效果的影响。实验证明:在参试的五种药剂中,脱氢醋酸钠的抑菌效果最为明显,可将其作为抑菌剂添加到保鲜剂中;选用2%的壳聚糖,0.2×10-6的脱氢醋酸钠和30×10-6的6-BA混合配制而成的保鲜剂,在12℃的环境下贮藏油豆角具有良好的效果。     

茶多酚与壳聚糖复配溶液对樱桃的保鲜效果研究

利用茶多酚具有抑菌作用、壳聚糖的成膜性,研制樱桃的无公害保鲜液。按不同浓度比配制茶多酚、壳聚糖溶液,将刚采摘的樱桃放入保鲜液中浸泡5min捞出,每天观察、测定樱桃的感官品质、腐烂率、失重率、有机酸含量、可溶性糖含量、VC含量、呼吸强度。当壳聚糖浓度为1.5%、茶多酚浓度为2.0%时的保鲜液保鲜效果较好。茶多酚与壳聚糖复配对樱桃具有较好的保鲜效果。     

壳聚糖在蒜米涂膜保鲜中的应用研究

以壳聚糖为主剂,加入不同助剂配制成涂膜液,于常温下对蒜米进行涂膜保鲜试验,研究壳聚糖涂膜对蒜米贮藏效果的影响。试验结果表明:配制壳聚糖涂膜液的最适助剂为乙酸1.0%、甘油0.5%、吐温200.2%。壳聚糖涂膜处理可降低蒜米贮藏期间的失重率,抑制呼吸、发芽、MDA的生成,降低总糖的消耗,延长蒜米的贮藏期,保鲜效果以1.5%的壳聚糖为最好。     

不同防腐处理对果脯蜜饯(台湾乌梅)微生物控制的影响

考察了蜜饯(台湾乌梅)贮藏过程中微生物的变化规律,研究了不同防腐处理(0.05%苯甲酸钠、0.03%脱氢醋酸钠、0.05%壳聚糖、0.10%壳聚糖、0.15%壳聚糖、0.20%壳聚糖、紫外线、紫外线+0.025%苯甲酸钠、紫外线+0.038%苯甲酸钠)对微生物控制的影响。研究结果表明:在贮藏期内(5个月),台湾乌梅蜜饯中细菌、霉菌和酵母菌随着时间的延长而不断增加,但增长比较缓慢;脱氢醋酸钠和壳聚糖均可明显抑制台湾乌梅蜜饯中微生物的生长,其中脱氢醋酸钠的抑菌效果甚至优于苯甲酸钠,因此有必要扩大脱氢醋酸钠的使用范围;紫外线处理也可抑制台湾乌梅蜜饯中微生物的生长,建议实际生产过程中增加紫外线照射处理步骤,以达到既控制微生物,又降低苯甲酸钠使用量的双重效果。     

壳聚糖-姜精油涂膜对草莓贮藏品质的影响

采用浓度为1%的壳聚糖与不同浓度(0.05%、0.10%、0.20%)的姜精油配制成保鲜液,对草莓进行涂膜处理,研究壳聚糖-姜精油对草莓贮藏品质的影响。结果表明,不同浓度的姜精油与壳聚糖保鲜液对草莓的保鲜效果表现不一,较低浓度的壳聚糖-姜精油保鲜液能够降低草莓的腐烂率、失重率、细胞膜的透性和丙二醛含量,减少可滴定酸、VC和可溶性糖含量的损失,有效地保持草莓的感观品质,能够更好地延缓草莓贮藏品质的下降。其中,壳聚糖-0.10%姜精油保鲜液处理草莓的贮藏品质最佳,而壳聚糖-0.20%姜精油保鲜液处理的草莓贮藏品质较差。     

八角等提取液与壳聚糖复合物对草莓保鲜效果的影响

用八角等提取液的抑菌作用和壳聚糖的成膜性研制纯天然、无毒的草莓保鲜剂。制备八角、丁香、肉桂的乙醇提取物,并加入壳聚糖配制不同浓度的保鲜液,将采摘的草莓用保鲜液浸泡5min后捞出,每隔24h测定草莓的失重率、腐烂指数、感官品质、呼吸强度、有机酸含量、可溶性糖含量、VC含量。八角等提取液浓度为2.0%、壳聚糖浓度为1.5%的保鲜液对草莓保鲜效果较好。八角等提取液与壳聚糖复合物对草莓具有明显的保鲜效果。     

草果提取物对鲫鱼的防腐保鲜研究

测定草果提取物对鲫鱼防腐保鲜效果。将草果提取物配制成0.3%浓度的保鲜液应用于鲫鱼肉的防腐保鲜,并与0.3%的山梨酸钾保鲜液和空白处理进行对照。结果显示,草果提取物能够明显抑制鲫鱼肉的细菌生长繁殖,并且减缓鱼肉TVB-N值和pH值的上升,同时减缓鱼肉感官品质的下降速度。结论:草果提取物对鲫鱼具有良好的抑菌和抗氧化作用,能够明显延缓鲫鱼的腐败变质,保鲜效果与山梨酸钾保鲜效果相当。     

辣根素和壳聚糖复合涂膜对草莓保鲜的影响

以1.25%的壳聚糖为涂膜基质,通过添加辣根素,分别配制了辣根素质量分数为0.2%、0.4%、0.6%、0.8%、1.0%的辣根素/壳聚糖复合涂膜液。以蒸馏水作为对照组,通过浸泡处理,考察不同辣根素浓度对室温下草莓保鲜效果的影响。结果表明,不同浓度的辣根素/壳聚糖复合膜涂液均能在一定程度上抑制草莓失重率和腐烂指数的上升,同时可延缓可溶性固形物含量、可滴定酸含量、VC含量和还原糖含量的下降,其中,浓度为0.6%的辣根素/壳聚糖复合保鲜液对草莓的保鲜效果最佳。因此,辣根素/壳聚糖可以作为天然抗菌膜液控制草莓表皮微生物的生长,延长果实的贮藏期。     

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.