淀粉接枝聚丙烯酰胺用于漂白废水处理

研究了淀粉接枝聚丙烯酰胺作为絮凝剂对漂白废水进行处理,通过实验比较了淀粉接枝聚丙烯酰胺絮凝剂与其他絮凝剂对漂白废水的絮凝效果,确定了淀粉接枝聚丙烯酰胺絮凝剂和明矾[Al2（SO4）3]配合使用的合适比例。结果表明：不同絮凝剂对漂白废水的絮凝效果好坏依次是Al2（SO4）3/St-PAM、St-PAM、PAM、Al2（S04）3。采用Al2（SO4）3和St-PAM混合使用时,Al2（SO4）3和St-PAM的最佳配比为1：1。     

淀粉接枝聚丙烯酰胺用于造纸废水处理

本文采用实验室研制的颗粒淀粉与丙烯酰胺接枝共聚产物作絮凝剂对废纸脱墨废水进行处理，获得良好的效果。通过实验探讨了淀粉接枝聚丙烯酰胺的加入量、废水的PH及絮凝时间对絮凝效果的影响，确定了淀粉接枝聚丙烯酰处理废纸脱墨废水的最佳条件。     

阳离子型聚丙烯酰胺接枝淀粉絮凝剂的制备春在造纸中的初步应用研究

主要研究阳离子型聚丙烯酰胺接枝淀粉絮凝剂的合成工艺及它在造纸中的应用。实验结果表明,接枝共聚物合成的最佳工艺条件为:接枝反应时,硝酸铈铵量浓度为1.O×10~(-3)mol/L,淀粉与丙烯酰胺单体质量比为1:3,接枝聚合反应温度及时间分别为50℃和3h;阳离子化时,n(接枝物):n(甲醛):n(二甲胺)=1.0:1.0:1.5,反应温度为70℃,反应时间为2h。该产品对造纸网下白水具有良好的絮凝效果。     

有机/无机复合絮凝剂的研制与应用

研究以淀粉-丙烯酰胺接枝共聚物为原料,通过Mannich反应,合成了同时具有阴、阳离子基团的两性高分子絮凝剂。以硝酸铈铵做引发剂,采用正交实验研究了淀粉改性阳离子型絮凝剂合成的工艺条件,实验结果表明,接枝共聚的最佳合成条件:硝酸铈铵1.2mol/L;丙烯酰胺(AM)与玉米淀粉(St)的配比3∶1(质量比);反应时间2h。阳离子化条件:丙烯酰胺∶甲醛∶二甲胺1∶1.2∶3(物质的量比),反应温度60℃;反应时间2h。再与硅酸钠、铝酸钠进行复配应用。     

改性淀粉絮凝剂的制备及其在造纸废水处理中的应用

以玉米淀粉和丙烯酰胺为原料、硝酸铈铵为引发剂,通过接枝共聚反应对淀粉进行改性,合成了淀粉/丙烯酰胺接枝共聚物(SAM),即改性淀粉絮凝剂。将合成的SAM絮凝剂用于造纸废水絮凝处理,讨论了SAM絮凝剂用量、废水的温度和p H值等因素对处理效果的影响。研究显示,在丙烯酰胺与淀粉质量比为2∶1、引发剂浓度2.0 mmol/L、反应温度40℃、反应时间3 h、反应体系p H值4.0的条件下,SAM絮凝剂合成反应的接枝率达到68.5%;红外光谱分析表明丙烯酰胺成功接枝在玉米淀粉基质中。将SAM絮凝剂用于处理混合造纸废水,当SAM絮凝剂用量为12 mg/L、废水p H值7~9、温度30℃条件下,CODCr去除率为88.4%,浊度去除率为91.2%,BOD5去除率为85.5%,处理后废水透光率为93.3%。     

阳离子淀粉对染料废水絮凝性能的研究

采用阳离子淀粉作为絮凝剂对染料废水进行处理，研究其絮凝性能．探讨了阳离子淀粉的用量、废水pH及絮凝时间和温度对絮凝效果的影响，确定了阳离子淀粉处理染料废水的最佳条件．试验结果表明：阳离子淀粉对染料废水有较好的絮凝效果，其絮凝效果与聚铝絮凝剂相近．     

高取代度阳离子淀粉—丙烯酰胺接枝共聚物的制备及应用

以高取代度的阳离子淀粉为原料,硝酸铈铵为引发剂,制备了高取代度阳离子淀粉—丙烯酰胺接枝共聚物,研究了丙烯酰胺与阳离子淀粉质量比、反应温度、反应时间、引发剂浓度对接枝率和接枝效率的影响。结果表明:接枝率和接枝效率最高的条件为丙烯酰胺与阳离子淀粉质量比2.5∶1,反应温度55℃,反应时间3h,引发剂浓度2.5mmol/L。将合成的聚合物用于废水处理,高取代度阳离子淀粉—丙烯酰胺接枝共聚物的用量为4mg/L对麦草浆中段废水的处理效果最好,废水CODcr去除率为34.1%,浊度的去除率为13.5%。     

应用高取代度阳离子淀粉处理造纸白水

本文采用实验室研制的高取代度阳离子淀粉作为絮凝剂时造纸白水进行处理，获得良好的效果通过实验探讨了高取代度阳离子淀粉的加入量、废水的pH值及絮凝时间对絮凝效果的影响，确定了高取代度阳离子淀粉处理造纸白水的最佳条件同时测定了处理前后的造纸白水CODcr值，发现高取代度阳离子淀粉能大幅度地降低造纸白水的CODcr值。     

蔗渣接枝丙烯酰胺絮凝剂的制备及其在尾矿废水处理中的应用

以制糖工业副产品蔗渣为原料,以硫酸亚铁铵和双氧水为催化剂,通过接枝共聚合反应制备了蔗渣接枝丙烯酰胺絮凝剂,考查了接枝聚合条件如催化剂的用量、反应温度、丙烯酰胺浓度和浴比等对接枝率的影响。通过模拟矾矿废水絮凝实验研究了蔗渣接枝丙烯酰胺絮凝剂的絮凝效果,结果表明,该絮凝剂能在1 min内达到较好的沉降效果,在选矿和尾矿废水处理领域具有较好的工业应用前景。     

磷酸酯淀粉絮凝剂在废水处理中的应用

用本实验室研制的磷酸酯淀粉作絮凝剂,对废纸脱黑废水和精细化工厂的工业废水进行处理,收到了明显的效果。本文通过实验探讨了磷酸酯淀粉的,加入量、废水的ｐＨ值及絮凝时间对絮凝效果的影响,确定了磷酸酯淀粉处理黑液和精细化工厂工业废水的最佳条件。     

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.     

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.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.