稻米中普鲁兰酶的纯化与性质的研究

稻米的普鲁兰酶（ＰｕｌｌｕｌａｎａｓｅＥ．Ｃ．３．２．１．４１）用ＤＥＡＥ－纤维素吸附，ＳｅｐｈａｄｅｘＧ－１００凝胶过滤，聚丙烯酰胺盘状凝胶电泳纯化，得到了聚丙烯酰胺凝胶电泳均一的纯酶。纯酶作用的最适温度为５０℃，最适ｐＨ为５．５。以普鲁兰（Ｐｕｌｌｕｌａｎ）为底物酶的米氏常数Ｋｍ为０．０１２５％，以支链淀粉为底物，酶的米氏常数Ｋｍ为２．５％，用ＳｅｐｈａｄｅｘＧ－１００凝胶层析法测得酶的分子量为７００００。     

UASB反应器处理烧碱-蒽醌草浆黑液的污泥颗粒化过程

用两套处理Ｓｏｄａ－ＡＱ化学草浆黑液上流式厌氧污泥床（ＵＡＳＢ）反应器作对比实验，研究处理这种废水的ＵＡＳＢ反应器的污泥颗粒化过程，并达到了１０ｋｇＣＯＤ／ｍ３·ｄ的工作负荷及在此负荷下ＣＯＤ（ｃｒ）４０％～５０％、ＢＯＤ５５６．５％～６３．５％的去除率，去除１ｇＣＯＤ产气量达到５１１ｍｌ，其中ＣＨ４含量为６６．８％。     

张家港市港达染料化工厂供货信息

阳离子染料：红 Ｘ－ＧＲＬ,蓝Ｘ－ＧＲＲＬ,黄 Ｘ－ＳＧＬ,金黄Ｘ－ＧＬ,艳红ＳＧＮ,红Ｘ－ＧＴＬ,翠蓝ＧＢ,桃红ＦＧ,蓝Ｘ－ＢＬ,蓝Ｘ－ＧＲＬ。 进口活性染料：黄 ３ＲＳ,红 ３ＢＳ,红 ＢＳ,红 Ｂ,蓝Ｇ,艳蓝 ＢＢ,艳黄 ＧＬ,．黑Ｂ,．黑 Ｎ。 可拔性染料。阳离子拔色黄３ＲＬ,可拔分散黄ＰＤ－Ｇ,橙 ＰＤ－Ｒ,大红 ＰＤ－ＧＧＳ,蓝 ＰＤ－ＧＤ。藏青 ＦＤ－２ＲＤ,深棕 ＰＤ－ＢＲＳ,黑 ＰＤ－ＲＳ,ＩＰＤ－ＧＳ。 荧光增白剂;腈纶荧光增白剂ＣＨ,腈纶荧光增白剂 ＢＡＣ（瑞士）,棉用荧光增白剂 ＢＴＷ（瑞士…     

亚硫酸氢钠、没食子酸丙酯阻断大鼠体内N－亚硝基脯氨酸的合成

以２４小时尿中Ｎ－亚硝基脯氨酸（ＮＰＲＯ）排泄量为指标，研究亚硫酸氢钠（ＮａＨＳＯ３）和没食于酸丙酯（ＰＧ）阻断大鼠体内Ｎ－亚硝基脯氨酸合成的作用。结果证明１７．５ｍｇＮａＨＳＯ３、５ｍｇＰＧ能有效地阻断４０μｍｏｌ脯氨酸和４０μｍｏｌ亚硝酸钠在大鼠体内合成ＮＰＲＯ，阻断率分别为９９．７８％和９２．９８％。     

顶青霉木聚糖酶的分离纯化与鉴定

使用硫酸铵分级沉淀、ＳｅｐｈａｄｅｘＧ－２５凝胶色谱脱盐、ＤＥＡＥ－ＳｅｐｈａｄｅｘＡ－２５和ＣＭ－ＳｅｐｈａｄｅｘＣ－５０离子交换色谱等分离纯化技术,从顶青霉（Ｐｅｎｃｉｌｉｕｍｃｏｒｙｌｏｐｈｉｌｕｍ）培养液中分离到３种木聚糖酶组分,分别称为ＰａｒｔＡ、ＰａｒｔＢ和ＰａｒｔＣ．ＰａｒｔＢ和ＰａｒｔＣ经ＳｅｐｈａｃｒｙｌＳ－２００凝胶过滤色谱和ＣｏｎＡ－Ｓｅｐｈａｒｏｓｅ４Ｂ亲和色谱进一步分离纯化,分别得到２个纯木聚糖酶组分．ＰａｒｔＢ经ＳＤＳ－ＰＡＧＥ鉴定为单带,相对分子质量为２４２００;ＰａｒｔＣ经ＳＤＳ－ＰＡＧＥ鉴定基本为单带,相对分子质量为４８３００     

L－缬氨酸菌种选育

以硫酸二乙酯（ＤＥＳ）诱变处理黄色短杆菌（Ｂｒｅｖｉｂａｃｔｅｒｉｕｍｆｌａｖｕｍ）ＸＱ５１２２，得到突变株Ｖ３－３６＜Ｌｅｕ￣１、α－ＡＢ￣ｒ、ＡＨＶ￣ｒ），在１０％葡萄糖培养基中可积累２．３％Ｌ－缬氨酸。以亚硝基胍（ＮＴＧ）诱变Ｖ４－１５３，得到一株突变株（Ｌｅｕ￣１、α－ＡＢ￣ｒ、ＡＨＶ￣ｒ、２－ＴＡ￣ｒ），再进行单菌落分离，得到突变株ＺＱ－２，能在培养基中积累Ｌ－缬氨酸４．２％～４．５％，最高达５．５７％．     

气相色谱—质谱法测定蜂王浆及其制品中10—羟基—α—癸烯酸

试样（鲜浆、冻干粉、口服液）经稀盐酸溶液调节ｐＨ为３．０以下,以乙醚萃取,气相色谱法（ＧＣ－ＭＳＤ）测定,外标法定量。方法简便、快速、准确,回收率９７．６％￣９８．９％,相对标准偏差２．０８％￣４．３９％。     

内硝基冠醚中间体的合成

研究了作为制备新型内硝基冠醚原料的中间体２－硝基－１，３－苯二酚（ＮＢ）及多甘醇双对甲苯磺酸酯（ＯＥＤＴ）的合成．通过改进ＮＢ的合成条件，使磺化、硝化、水解三步总收率由１２．９％提高到３７．５％；以吡啶为溶剂和ＨＣｌ的束缚剂，控制反应物摩尔比为ＴｓＣｌ∶ＯＥＧ＝２．０６∶１．００，在０℃～５℃反应２ｈ后，加入适量水静置过夜，可明显提高ＯＥＤＴ的收率和纯度．     

高效液相色谱快速测定食品及饲料中抗氧化剂BHT

用高效液相色谱法紫外检测食品和宠物饲料中抗氧化剂ＢＨＴ含量，采用Ｎｏｖａ－ｐａｋＯＤＳ３．９×１５０ｍｍｉ．ｄ．（４μｍ）色谱柱，甲醇：水：３６％乙酸（８５：１０：５）为流动相，紫外检测波长为２８０ｎｍ。宠物饲料的回收率为９３．０－１００．５％，食用油的回收率为９３．５－１１７．０％，变异系数均小于８．３％。本方法快速、简便、灵敏，可用于食品的日常测定     

冷库温湿度的微机控制

介绍了冷库温湿度电脑控制仪，该控制仪适用于各种类型冷库的温湿度控制。主要由ＭＣＳ－５１系列单片机、Ａ／Ｄ转换板、输出控制电路、显示电路、报警电路、测温和测湿器件等组成。温湿度控制范围为：温度（－４０±０．５）～（１１±０．５）℃；相对湿度（０％～１００％）±（２％～３％）．几年来的试运行表明，利用该电脑控制仪控制冷库的温湿度，精度高，库内温湿度波动小，提高了冷冻产品的质量，而且能耗明显降低，平均节电８％～１０％．     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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.     

Influence des ions sur le pouvoir hydratant de l'ure e: e tude sur peau de porc ex vivo

This study deals with the influence of ions (NaCl and MgSO4) in a W/O emulsion containing 10% urea. Moisturization kinetics are assessed by corneometry on pig skin ex vivo. The formula's influence on urea penetration is measured by infrared spectrometry with an ATR device and the stripping method. Corneometry and spectroscopy were chosen to record simultaneously the hydratation levels and urea localization into superficial cell layers. Urea crystallization after evaporation of emulsions and aqueous solutions is described. Results show that urea does not hydrate nor penetrate when applied to the skin through an aqueous gel. In a W/O emulsion, sodium chloride increases the ability of urea to moisturize without improving penetration. In vitro urea crystallization is disturbed by sodium chloride or magnesium sulphate for solutions and emulsions. This stabilization by ions is correlated with good moisturization values. The stabilization of urea in the solute state provided by ions increases its water epidermal binding capacity without enhancing penetration.     

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 on Economic Indicators from 62 Enterprises in Printing Machinery Industry in Q1 2014

Operation of printing machine industry was still unsatisfactory in the first quarter of 2014.Analysis on operation of printing machine industry.a.Market demand was not strong;sales of product undulated and declined.According to the statistics,the total industrial output value fell by 19.28% in the first quarter of 2014 than the average quarter value in 2013; industrial added value decreased by 4.16%; sales revenue dropped by 22.83%. h. Business operation of enterprises was in poor condition. c. R＆D of new products is an important transformation guarantee for enterprises. d. To take self explore new ways upgrading advantages,and explore new ways.