油茶籽化妆品基础油复合脱色工艺的研究

研究了不同脱色剂对油茶籽化妆品基础油的脱色效果,确定了最佳的复合脱色剂配比为7. 5%膨润土+2. 5%凹凸棒土+0. 5%活性炭(占油质量)。通过对油茶籽油脱色温度、脱色时间、复合脱色剂用量的单因素实验及验证实验,得出油茶籽化妆品基础油的最佳脱色工艺条件为复合脱色剂用量7%～8%、脱色时间30～40 min、脱色温度100～110℃,此条件下脱色油色泽小于R0. 1/Y2. 5,微量营养成分多酚、V_E、角鲨烯、谷甾醇含量分别为27、263、64、276 mg/kg左右,得率约92. 5%,酸价、过氧化值、磷含量变化较小。     

脱色对油茶籽油品质及性能的影响研究

目的：探究脱色工艺对油茶籽油品质及性能的影响。方法：以亚临界萃取油茶籽毛油为实验对象,分别采用白土脱色(工艺Ⅰ)和白土活性炭粒复合脱色(工艺Ⅱ),对油茶籽油脱色前后主要活性成分(山茶甙、角鲨烯、茶多酚)的含量,以及脂肪酸组成、酸价、过氧化值等理化指标进行考察,并分析脱色工艺对油茶籽油DPPH·自由基清除能力、紫外吸收能力以及油脂氧化稳定性的影响。结果：脱色后角鲨烯和茶多酚含量均有所降低;脱色工艺对油茶籽油脂肪酸组成的影响较小,不饱和脂肪酸含量均在89%以上,对油茶籽油酸价的影响较大,脱色工艺Ⅰ油茶籽油酸价降低13.667 7%,脱色工艺Ⅱ油茶籽油酸价升高41.421 6%,脱色后油茶籽油的过氧化值均有所上升,氧化稳定性下降,油茶籽油紫外吸收能力降低;经工艺Ⅰ脱色后的油茶籽油自由基清除能力上升,而经工艺Ⅱ脱色后的油茶籽油自由基清除能力下降,常温下工艺Ⅱ的氧化稳定性最高。结论：综合考虑,工艺Ⅰ脱色油的品质及性能更好。     

油茶籽油脱色工艺的响应面优化研究

以脱酸油茶籽油为原料,进行吸附法脱色试验,在单因素试验基础上,采用Box-Behnken设计响应面法优化脱色工艺条件。得到最佳工艺为,脱色剂为活性炭与硅藻土混合物(质量比例为1︰3),脱色温度82℃,脱色时间35 min,混合脱色剂添加量3.5%,该条件下得到脱色率为92.461%,且其色泽达到化妆品和医药用油茶籽油对色泽的要求。     

水酶法同时提取油茶籽油及蛋白研究

采用水酶法从油茶籽仁中同时提取油与蛋白。经筛选,使用碱性蛋白酶水解油茶籽仁水液,并对酶解工艺条件进行优化。通过单因素实验及正交试验,确定水酶法提取油茶籽油和蛋白的最佳工艺参数为料液比1∶5、蛋白酶用量1.5%、酶解p H 8,酶解温度60℃、酶解时间4 h。在此最佳条件下进行实验验证,油茶籽油得率为74.61%,油茶籽蛋白得率为82.28%。     

油茶籽油的水媒法罐组式逆流提取工艺优化及其品质分析

在茶皂素辅助水媒法提取油茶籽油研究的基础上,通过正交试验优化了水媒法罐组式逆流提取油茶籽油的工艺条件。同时,对比了水媒法罐组式逆流提取工艺、土榨法、溶剂浸出法、乙醇水提法、超临界萃取法所得油茶籽油的质量指标。结果表明,水媒法罐组式逆流提取油茶籽油的最佳工艺条件为:纯水提取,提取温度50℃,pH 10,料液比1∶3,单次提取时间30 min。在最佳工艺条件下,提油率为88. 25%,所得油茶籽油品质优良,富含多酚、角鲨烯等有益物质。水媒法罐组式逆流提取工艺安全环保,提取剂用量少,提取温度低,能够在保证油品质量的同时提高油茶籽油提取效率,在植物油提取工艺上具有应用和推广的潜力。     

改性膨润土无水精炼油茶籽油工艺研究

提出了改性膨润土无水精炼油茶籽油工艺,该工艺先用活性白土脱色,然后用碱性钙基膨润土脱酸,在脱色及脱酸的同时进行了脱胶,并对脱色与脱酸工艺的条件进行优化。结果表明:改性膨润土无水精炼油茶籽油工艺能满足油茶籽油的脱色、脱酸、脱胶要求,过氧化值与杂质含量也有一定的下降,极大地简化了油品的精炼工艺,降低了生产成本。     

无色茶油的研制

目的:传统的脱色方法很难使荼油达到化妆品和医药用油的色泽要求,采用生物酶脱胶、膜技术、碱脱酸、吸附脱色等方法综合处理,使茶油精烁后达到无色.方法:用中心组合设计优化吸附脱色的工艺条件.结果:最佳脱色工艺条件为:反应温度87℃,吸附剂用量2.7%,反应时间30min,荼油脱色率为90.22%.结论:经上述方法综合处理后所得荼油色泽为ROY0(25.4mm比色槽),达到化妆品和医药用荼油的要求.     

瓜蒌籽油脱色工艺研究

脱色是瓜蒌籽油精炼过程中比较难处理的环节。选用活性白土对瓜蒌籽油进行脱色,测定了瓜蒌籽油的脱色率,并探讨了不同脱色工艺对瓜蒌籽油脱色率的影响。结果表明,采用磷脂酶脱胶-脱酸-脱色工艺脱色效果较理想。通过单因素实验确定了最佳工艺条件为:活性白土用量14 g/100 g,脱色温度95℃,脱色时间20 min。在最佳工艺条件下瓜蒌籽油脱色率达到98.5%。     

油茶籽储存时间对水酶法提油的影响研究

以pH 5. 0、料液比1∶5、α-淀粉酶用量1%、纤维素酶用量1%、提取时间3 h、提取温度50℃为基本条件,研究了油茶籽储存时间对水酶法提取油茶籽油提取率及品质的影响。结果表明:储存时间对油茶籽油提取率及油茶籽油品质影响显著,建议油茶籽在储存时间1～3个月内处理,其中使用储存时间为1个月左右的油茶籽最佳,油茶籽油提取率为91. 6%;所制备的油茶籽油气味清香、涩口味较淡,基本理化指标除水分外优于国标一级压榨油茶籽油标准,油中的维生素E、多酚和角鲨烯含量分别达到321、28 mg/kg和178 mg/kg,而且油茶籽的后熟期油中脂肪酸转化基本完成,油酸含量达到了79. 69%。     

栝萎子油脱色工艺研究

栝篓子油作为一种新开发的油,其中含有大量色素物质,容易氧化变色,严重影响感官和品质.本文采用三因素三水平的正交实验设计,得到了栝蒌子油用活性炭和活性白土脱色的较优工艺条件.活性炭脱色的较优工艺条件为:活性炭用量为2%.脱色时间为30min,搅拌速度为40r/min.活性白土脱色的较优工艺条件为:活性白土用量为1.5%.脱色时间为25min,搅拌速度为60r/min,活性白土脱色效果比活性炭好.因此,栝蒌子油脱色工艺宜采用活性白土作为脱色刺.     

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