保险粉在机木浆漂白中的应用

介绍了国内外保险粉用于漂白机木浆的现状。讨论了保险粉的主要特点，漂白机理及保险粉用于机木浆漂白时的工艺特点和操作参数。分析比较了保险粉与过氧化氢漂白机木浆的技术性能和经济成本。     

提高聚乙烯醇─丝蛋白共混纤维白度及色泽鲜艳度的探讨

探讨了双氧水、保险粉漂白及增白剂增白工艺条件对聚乙烯醇─丝蛋白共混纤维白度及染色鲜艳度的影响。结果表明，双氧水漂白所获得的白度比保险粉漂白的高。如果要求有较高白度，可采用双氧水─保险粉双漂工艺。     

马尾松SGW保险粉漂白的研究

保险粉是一种常用的还原性漂白剂,本文对马尾松机械磨木浆（SGW）进行了保险粉漂白试验,确定了保险粉漂白的最佳工艺参数,同时探讨了在保险粉漂白中存在的问题和解决方法。     

提高聚乙烯醇—丝蛋白共混纤维白度及色泽鲜艳度的探讨

探讨了双氧水 保险粉漂白及增白剂增白工艺条件对聚乙烯醇－丝蛋白共混纤维白度及染色鲜艳度的影响，结果表明，双氧水漂白所获得的白度比保险粉漂白的高，如果要求有较高白度，可采用双氧水－保粉双漂工艺。     

保险粉在纸浆漂白中的应用

保险粉是一种常学原性纸浆漂白剂，该文介绍了几种典流程以及保险粉在纸浆白中的应用和研究现状，分析了保险粉纸浆漂白的性能，环境影响和成本。     

棉秆皮纤维漂白工艺的研究

文中以棉秆皮纤维为研究对象,针对其脱胶处理后具有的天然色泽问题,选用保险粉为漂白试剂,通过单因素实验法,讨论了保险粉用量、pH值、漂白温度和时间分别对纤维白度、细度、断裂强度、失重率的影响,确定了较佳的漂白工艺为:保险粉用量12 g/L、pH值为9、漂白温度50℃、漂白时间65 min。采用该工艺漂白后,棉秆皮纤维白度提高了10%左右,细度明显减小,断裂强度有所下降但影响较小,说明保险粉对棉秆皮纤维漂白的同时达到了二次脱胶的作用。     

黄麻纤维无氯漂白工艺的研究

保险粉与双氧水两浴两步法联合漂白黄麻纤维可显著地提高漂白效果,并且对纤维的损伤较小.保险粉和双氧水联合漂白是一种低污染、高效率漂白方法,其亨特白度值与亚氯酸钠漂白的相似,高达79.95.在漂白过程中,需严格控制保险粉和双氧水的质量浓度,最佳漂白质量浓度分别为6 g/L和8 g/L.     

保险粉应用于味精生产的探讨

本文介绍了还原型漂白剂保险粉应用于味精生产的可行性。保险粉具有很强的还原性，可以用来漂白味精料液，从而改善味精成品的色泽。     

维纶基牛奶纤维漂白研究

二氧化硫脲是一种还原型漂白剂，对牛奶纤维有较好的漂白能力，漂白效果优于双氧水和保险粉，且对纤维的损伤较小，同时其BOD和COD值较低，可作为低污染的无毒漂白剂使用、当二氧化硫脲质量浓度为1g／L、保险粉质量浓度为0．5g/L时，具有较好的协同作用，其漂白试样白度可达到72.33，而且氧化一还原漂白对牛奶纤维的结构无影响．     

环保型保险粉漂白试验

对新型的环保型保险粉和目前市售的保险粉作了对比试验,结果表明两种保险粉的 漂白效果比较接近,环保型保险粉可代替市售型保险粉,且环保型保险粉因溶解时无臭气, 有一定的环保作用。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

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

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

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.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

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