新型微生物控制技术在生活用纸中的应用

随着生活水平的提高,生活用纸的产量和消费量日渐增长。消费者对生活用纸的品质特别是与健康卫生相关的微生物控制提出更高的要求。有效的微生物控制方案不仅保护纤维等原料,保证产品质量,还能够提高纸机效能和运行效率。NALCOWater研发了新一代OxiPROTM稳定型微生物控制技术,通过在线反应生成稳定的活性成分,并在系统中缓慢释放,防止浆料因微生物繁殖引起的腐败,为浆料防腐提供良好的持效性。与常用的氧化型次氯酸钠类及氯胺类杀菌剂相比,新型OxiPROTM微生物控制技术在气相中腐蚀速率最小,与添加剂的相容性高。本文通过实验研究和应用案例阐明通过该项新技术的使用不仅保证生活用纸品质．有效提高纸机生产效率,同时通过降低杀菌剂的腐蚀风险保护纸机设备。     

弱氧化杀菌系统在改善造纸系统异味中的应用

将弱氧化型杀菌剂添加于造纸系统以控制厌氧细菌的繁殖,进而控制车间异味的产生。通过对pH、ORP(氧化还原电位)和PID(挥发性有机物气体)检测监控,对系统白水的细菌、霉菌检测,并对纸机的运行状况以及清洁状况进行跟踪。结果表明:添加弱氧化型杀菌剂后系统pH从6.01上升到7.68,氧化还原电位从-300 mV上升到100 mV,车间的PID(挥发性有机物气体)基本监测不到,车间刺激性臭味等大大降低。     

两种CIP杀菌剂杀菌效果的比较

对两种杀菌剂在CIP清洗杀菌过程中的效果进行了比较,通过试验发现,杀菌剂的浓度和杀菌时间会对杀菌效果产生明显影响,而过氧化氢和过氧乙酸都属于不稳定的氧化型杀菌剂,所以在生产过程中必须定期跟踪检验杀菌剂浓度,并及时补充添加杀菌剂,保证杀菌剂A最低浓度在0.10%,杀菌剂B最低浓度在0.15%。     

国产有机溴类杀菌剂的应用

介绍了在纸机抄纸系统应用国产有机溴类杀菌剂的情况。应用效果表明:国产有机溴类杀菌剂在低浓度和低用量水平下,仍然有较好的杀菌效果,与其他杀菌剂相比,不仅杀菌效果好,且具有成本优势。     

腐浆成因及异噻唑啉酮类杀菌剂的生产应用试验

纸机运转过程中的腐浆障碍是由系统内微生物引起的。本文讨论了腐浆形成的原因以及生产中利用杀菌剂进行防腐的试验情况,发现选用高效、广谱、低毒的“绿色”杀菌剂比传统杀菌剂更能解决腐浆障碍问题,取得较好的防腐效果,并大幅度提高纸机运转率。     

Eka Purate(R) ClO2杀菌剂——造纸系统的清道夫

介绍了依卡化学品公司的一种新的二氧化氯(ClO2)杀菌剂.与传统的杀菌剂相比,ClO2杀菌剂能更好地提高纸机的运行性能,从而提高产量和纸品质量.     

防霉杀菌剂在纸机清洁生产中的应用

在纸机湿部添加防霉杀菌剂是解决微生物困扰纸机运行的主要手段.该文通过实例介绍了防霉杀菌剂的使用方法.应用表明,使用恰当的防霉杀菌剂并优化添加方案,不但可有效地控制微生物污染问题,而且能提高纸张的质量和产量,给企业带来较好的经济效益.     

巴氏消毒奶生产设备消毒剂选择及应用研究

研究了4种常见消毒剂对巴氏消毒奶中腐败微生物的杀菌效果,并在实际生产中应用。结果表明:二氧化氯、84消毒液、过氧乙酸和酒精对腐败样品中的微生物均具有杀菌效果,在4种杀菌剂推荐的使用范围中,过氧乙酸杀菌效果最优。选取浓度为1∶400的过氧乙酸应用于管路清洗消毒,结果显示采用过氧乙酸消毒的管道杀菌消毒效果与传统的热碱洗、热酸洗及热水洗等同。     

Eka Purate^ClO_2杀菌剂--造纸系统的清道夫

介绍了依卡化学品公司的一种新的二氧化氯（CIO2）杀菌剂。与传统的杀菌剂相比,CIO2杀菌剂能更好地提高纸机的运行性能,从而提高产量和纸品质量。     

Eka Purate~ClO_2杀菌剂——造纸系统的清道夫

介绍了依卡化学品公司的一种新的二氧化氯(ClO2)杀菌剂。与传统的杀菌剂相比,ClO2杀菌剂能更好地提高纸机的运行性能,从而提高产量和纸品质量。     

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.     

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.     

低温带皮菜籽粕微粉的不同粒级部分的功能特性

为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。     

Microbiology of food taints

Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated.     

Analysis for organic residues from aids to polymerization used to make plastics intended for food contact

Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (¹     

Tests of potential functional barriers for laminated multilayer food packages. Part II: Medium molecular weight permeants

Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane.     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. I: Interlaboratory studies of methods of analysis

This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel.     

Focus on China's Paper Industry

In the English section of this issue, 〈China Paper Newsletters〉 will introduce ＂National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the ＇13th Five-Year Plan＇＂, ＂2013 Annual Report of China＇s Paper Industry＂, and news of projects and other policies.     

Listen to downstream & search for innovation

正Nowadays,textile enterprises are all taking efforts in transformation and upgrading,like improving producing capacity and optimizing production structure to face market downturn.It claimed a higher request to the standard of textile equipments.In the upcoming of ITMA ASIA+CITME 2014exhibition,this magazine have interviewed several branch associations and a series of relative enterprises,to summarize industrial developing status