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(GPC)凝胶色谱法清洁食用油中的塑料添加剂N,N'-二甲基-N,N'-二(苯甲基)-1,2-乙二胺
2017/12/17 21:53
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方案详情：
Plastics are ubiquitous in our society and are extensively used in a large variety of
packaged foods. A variety of chemicals that enhance the physical quality of plastics
are often added as well. Some commonly used additives include plasticizers (such
as phthalates) to improve flexibility, UV filters for protection from sunlight,
brightening agents, coloring agents, and preservatives. Enhanced by a number of
environmental factors, some of these additives may migrate into food products that
have been packaged using plastics. There is currently a great deal of interest in
measuring the migration of these compounds into food products, as considerable
uncertainty exists regarding the human health risks associated with exposure to
such compounds.
Gel permeation chromatography (GPC) is a highly effective method for the removal
of high molecular weight interferences such as lipids from a fatty food prior to
analysis for the compounds of interest. GPC has been used to clean up fatty foods
contaminated with plasticizers and other plastics additives.
This note describes the use of GPC clean‐up
to separate a variety of plastics additives,
such as phthalates, Chimassorb® 81 (a UV
absorber and stabilizer), Irganox® 1076 (an
optical brightener) and Uvitex® OB (an
antioxidant and thermal stabilizer) from a
representative edible oil sample prior to
analysis.
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台阶仪在三维形貌表征领域的应用
Stylus-based surface profiling is a standard technique for accurate, repeatable surface shape, topography and step height measurement in applications ranging from semiconductor R&D to solar cell QC.
2008/12/15
NanoBrook产品应用-12-ZetaPALS
文献名： Structural, morphological and optical properties of Bi NPs obtained by laser ablation and their selective detection of L-cysteine 作者： Ramon Gabriel Teixeira Rosaa, Celso de Araujo Duartea , Wido Herwig Schreinera, Ney Pereira Mattoso Filhoa, Arandi Ginane Bezerra Jr.b, Andersson Barisonc, Fernanda Maria Marins Ocamposc a Departamento de Física, Universidade Federal do Paraná Centro Politécnico, CP 19044, 81531-990 Curitiba (PR), Brazil b Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba (PR), Brazil c Departamento de Química, Universidade Federal do Paraná Centro Politécnico, CP 19081, 81531-990 Curitiba (PR), Brazil 摘要：In the present work we show the results of the investigation of the properties of bismuth nanoparticles (NPs) obtained by the laser ablation in water. The samples were characterized by various techniques: UV/vis spectroscopy, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance and zeta potential. The NPs were metallic and surface oxidated, exhibiting absorption peak at 257 nm due to the surface plasmon resonance. The interaction between the NPs and various amino acids was studied and revealed a selective sensibility to cysteine on a range of concentration from 80 to 720 μM, which we attribute to a dimerization of cysteine to cystine probably complexed to the nanoparticle surface by electrostatic interactions, leading to the modification of the NP absorption spectrum. 关键词：Bismuth; Nanoparticles; Laser ablation; Cysteine
2015/04/16
中药提取类产品解决方案
从中药中提取分离化合物，第一步需要将中药材中的成分用有机溶剂提取出来，包括常规的有机溶剂浸泡，超声提取，超临界提取和加速溶剂萃取（Aseeker-600型加速溶剂萃取仪）等，得到一份总提物。
制药/生物制药
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赛默飞电镜惰性气体真空保护样品传输系统CleanConnect?
Thermo Scientific针对空气敏感样品开发了惰性气体/真空保护样品传输系统CleanConnect，为空气敏感材料表征开拓出了全新视野。惰性气体/真空保护样品转移工作流程能够帮助科研工作者拓展空气敏感材料的研究边界，探究更多未知领域。
其他
2022/11/08
公司名称： 香港华运有限公司广州办事处
公司地址： 广州科学城科学大道182号创新大厦C2-404 联系人： 于瑞国 邮编： 510000
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