废白土中油脂回收与废白土的再生利用

对废白土中油脂的回收和废白土的再生利用进行了研究。通过对废白土浸出、油脂的回收及废白土的焙烧、酸洗等再生工艺条件最优化,使油脂的回收率达到84%。结果表明,经脱色后的废白土,不宜放置时间过长,否则回收利用价值下降。废白土的最佳再生工艺条件为:焙烧时间60min、酸洗浓度7%、残油率4·31%。用再生白土和新白土对3种不同油脂进行脱色试验,再生白土的脱色力接近新白土,证明了再生白土作为吸附剂是可行的。     

油脂脱色废白土再生工艺的研究

以油脂生产中的脱色废白土为原料,制备再生白土.通过对废白土中油脂回收,再对去油白土进行焙烧和酸洗.通过实验确定的最佳再生条件为:焙烧时间60min,硫酸酸化的浓度7%,水洗至pH 4.5.在此条件下再生白土脱色率最好,可达到98.2%.     

废白土中油脂回收工艺与实践

以蓖麻油脱色后的废白土为原料,利用自行设计制造的专业提油设备,采用6#溶剂浸出工艺回收废白土中的油脂.工艺操作稳定,回收的油脂通过精炼可达到国际1#蓖麻油标准,脱油后的废白土残油量小于5%.介绍了专业提油设备的结构和工艺流程,讨论了生产实践中作业温度、萃取次数等因素对浸出效果的影响.     

废白土中油脂回收与废白土的再生利用

对废白土中油脂的回收和废白土的再生利用进行了研究。通过对废白土浸出、油脂的回收及废白土的焙烧、酸洗等再生工艺条件最优化，使油脂的回收率达到84％。结果表明，经脱色后的废白土，不宜放置时间过长，否则回收利用价值下降。废白土的最佳再生工艺条件为：焙烧时间60min、酸洗浓度7％、残油率4．31％。用再生白土和新白土对3种不同油脂进行脱色试验，再生白土的脱色力接近新白土，证明了再生白土作为吸附剂是可行的。     

改良水剂法对脱色废白土油脂回收效果研究

采用表面活性剂与传统水剂法相结合方法对回收脱色废白土油脂效果进行研究.试验结果表明,回收脱色废白土油脂最优工艺为:碳酸钠添加量0.3％、提取温度95℃、提取时间35 min、表面活性剂为OS-15,在此条件下,脱色废白土油脂回收率可达96.72％.     

从油脂脱色废白土中回收油脂的研究

简述了从油脂脱色废白土中回收油脂的几种方法,并在小试、中试的研究过程中重点探索了溶剂法回收油脂脱色废白土中油脂的工艺效果及影响因素,证实了溶剂法是一种能应用于生产的有效方法     

油脂精炼废白土中油脂回收和废白土再生工艺的研究

为了更好地利用废白土增加效益,利用自行设计的一种新型三段式浸出器,对油脂脱色废白土中油脂的回收工艺及影响因素进行了研究。结果表明,用该工艺回收后的油脂品质好,能达到食用标准,且回收后的废白土残油量小于5％。在此基础上利用自行设计的两段白土再生器将二次废白土再生。     

油脂脱色废白土二次煅烧再生工艺的研究

采用二次煅烧对油脂脱色废白土进行再生,对煅烧温度及煅烧时间进行了探索研究。通过实验确定最佳脱色废白土再生条件为520℃两次煅烧0.5 h,该条件下所得再生白土脱色率可达79.79%,接近于新活性白土的脱色效果(82.18%),实现了循环利用、节约成本、节能降耗、环保安全的目标。     

植物油中的色素及吸附脱色研究进展北大核心CSCD

植物油中的色素不仅会影响油脂的色泽,还会降低油脂的品质和贮藏稳定性。脱色过程是去除油脂不良色泽的重要工序,而吸附脱色是油脂企业加工过程中最常用的脱色方法。概述了植物油中色素的来源以及色素的存在对油脂营养和安全性的影响,简要介绍了膜脱色法、光能脱色法、超声辅助脱色法、热脱色法、吸附脱色法等常见的脱色方法,综述了活性白土、活性炭、凹凸棒土(石)、硅胶和复合脱色剂等吸附剂的应用研究进展,总结了吸附脱色目前所存在的问题,如脱色过程中废白土处理率低、深色油脂脱色难,并提出了解决建议(提高废白土中油脂的回收利用,开发针对性的脱色方法等),最后针对目前油脂工业脱色技术的现状和在脱色过程中需要解决的问题进行了思考和展望。     

电滤法能降低脱色白土耗量

<正>在食用油加工中,降低脱色白土用量一直是努力方向,这样不仅能降低成本,而且也能减少环境问题。最近,国外油脂业引入逆流脱色法后,脱色白土用量可降低40％。同时也减少油耗和废白土量,现面临进一步经济问题是,可否通过改进白土粒度结构、即白土粒度达到怎样程度以能达到减少白土耗量。     

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.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

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