不同絮凝剂在肠衣废水蛋白质回收中的应用研究

研究了不同絮凝剂回收肠衣废水蛋白质工艺,实验结果表明,聚合硫酸铁最优絮凝工艺条件为絮凝剂聚合硫酸铁用量为0.3g/L,絮凝时间为35min,絮凝pH值为7.0,絮凝温度为30℃。蛋白质回收率达到90.1%,COD去除率达到81.2%;壳聚糖最优絮凝工艺条件为絮凝剂用量为0.3g/L,絮凝时间为35min,絮凝pH值为6.5,絮凝温度为30℃。蛋白质回收率达到83.1%,COD去除率达到76.4%;单从蛋白质去除率和COD去除率出发,聚合硫酸铁是肠衣废水预处理的最佳絮凝剂,但从回收蛋白质再利用角度出发,应选择壳聚糖。     

魔芋絮凝剂处理蛋白废水的研究

本研究以魔芋系列产品为絮凝剂研究了蛋白废水絮凝工艺条件。分别考察了絮凝剂种类、pH值、COD初始值和絮凝剂用量对COD去除率的影响,采用正交试验对絮凝条件进行优化。结果表明:魔芋微粉絮凝效果最佳;pH值对絮凝有极显著影响;COD初始值对絮凝有显著影响;絮凝剂用量宜在3.0g/L以上,在3.5～5.0g/L范围内未见显著差异;絮凝的最适条件是pH4.5,COD初始值6892mg/L以及微粉用量3.5g/L;最适条件下的COD去除率达75.84%。     

壳聚糖改性絮凝剂处理印染废水的研究

研究了用壳聚糖与丙烯酰胺接枝共聚物做为絮凝剂对印染废水的絮凝处理,并与壳聚糖进行了絮凝效果比较,考查了pH值、无机絮凝剂、有机絮凝剂等因素对处理效果的影响。实验结果表明,在pH值5-8,PAC用量500mg/L,壳聚糖改性絮凝剂用量60mg/L时,染料废水的脱色率可达95%以上,COD去除率达76%,其絮凝效果明显好于壳聚糖。     

甲壳素废水中虾青素与蛋白质絮凝工艺条件的研究

对含有虾青素的甲壳素废水的絮凝工艺条件进行了研究。试验结果表明,采用明矾作絮凝剂效果最佳;较佳的絮凝工艺条件为:55℃,水浴20min,pH为6.0,絮凝剂用量为20mg/L;经凯氏定氮测得蛋白质和虾青素混合物的回收率达到89.1%。     

壳聚糖改性絮凝剂在染料废水处理中的应用

采用壳聚糖与有机单体丙烯酰胺接枝共聚制备絮凝剂,并用此絮凝剂对活性染料废水进行混凝处理.考查了无机絮凝剂、有机絮凝剂、废水pH值等因素对处理效果的影响.实验结果表明,在pH值5～9,PAC用量500 mg/L,壳聚糖改性絮凝剂用量6 mg/L时,染料废水的脱色率可达95%以上,COD去除率高于74%.壳聚糖改性絮凝剂处理活性染料废水时,具有原料来源丰富、用量小、使用条件温和、成本较低、絮凝效果显著等优点.     

絮凝微滤组合工艺处理退浆废水

采用絮凝微滤组合工艺处理退浆废水，考察了聚硅酸硫酸铝絮凝剂用量、温度、pH值、搅拌时间对退浆废水处理效果的影响，得出了适宜的絮凝条件：絮凝剂投加量120mL/L，温度30℃，pH值4，搅拌2min。与单一微滤相比，絮凝微滤组合工艺处理退浆废水，COD去除率提高了20％～40％，最终渗透液COD仅为4570mg／L。在80℃，采用5g／L的氢氧化钠和10g／L的硝酸溶液交替清洗2h，陶瓷膜的通量恢复率可达到95％。     

胶原蛋白与PAM絮凝剂处理造纸中段废水的研究

研究了胶原蛋白絮凝剂处理造纸中段废水的工艺条件,探究了絮凝剂加入量、反应时间、反应温度、pH值对COD去除率、SS去除率、色度去除率的影响。实验结果表明:调节废液pH值在6,絮凝剂用量在2 mg/L,温度在40℃,反应时间30min,能够沉降废水中大部分悬浮物质,使废水COD明显降低。其胶原蛋白絮凝剂可达到COD去除率59.41%、SS去除率77.12%、色度去除率86.67%,而PAM在其最佳处理条件去除效果达到COD去除52.22%、SS去除率65.91%、色度去除率67.59%,同时使用胶原蛋白絮凝剂比PAM节省1.2元·t-1纸,可见胶原蛋白絮凝剂较优于PAM。     

壳聚糖絮凝分离豆腐废水蛋白的研究

研究了采用生物絮凝法处理豆腐废水的可行性。探讨了絮凝剂的种类、添加量、废水的前处理、絮凝时间及pH对絮凝效果的影响,并重点比较了复合絮凝剂对废水中蛋白质和低聚糖的絮凝作用。单一絮凝剂试验结果显示壳聚糖的絮凝效果明显优于聚合硫酸铁、聚合三氯化铝、海藻酸钠、聚丙烯酰胺。较优的添加量为0.6~0.8 mg/mL,添加量过高浊度会不降反升。絮凝前废水-18℃冷冻处理有利于蛋白质的分离,絮凝后的沉降是必要的,时间以12 h为宜。复合絮凝剂中所有组合都表现出明显的协同增效作用,尤以0.5mg/mL壳聚糖+0.3mg/mL海藻酸钠效果最佳,pH 4.5条件下絮凝后浊度降低97.8%,原液中蛋白脱除率高达76.842%,而低聚糖(减少6.56%)几乎不受影响,是较为理想的豆腐废水絮凝剂组合。     

壳聚糖絮凝剂在硫酸软骨素废水处理中的应用

硫酸软骨素生产过程中,会产生含有大量有机物的工业废水。本文选用壳聚糖作为絮凝剂,以絮凝剂用量、絮凝温度、絮凝时间、絮凝pH值为因素作正交试验L9(34),通过正交试验来分析影响絮凝效果的主要因素,确定最佳的絮凝工艺条件。实验表明,壳聚糖处理后的COD去除率达65%左右。     

壳聚糖絮凝剂对粉丝废水的絮凝效果研究

研究了壳聚糖为絮凝剂絮凝沉降粉丝浓浆废水的条件及效果。结果表明 ,絮凝沉降速度快 ,COD除去率为 86 % ,蛋白质回收率为 81%。在 p H条件为 6 .5～ 8.5时 ,高浓度较低浓度的壳聚糖絮凝效果好 ,煮沸废水有利于沉降     

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.