食品、乳制品中硝酸盐、亚硝酸盐的测定

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

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矿物油组成中的共轭体系物质在紫外光区有较强的吸收，依据朗博 - 比尔定律，在256nm紫外光波长，可测定油样的吸光度来确定相应油的量。 由于紫外光度法对于油种的敏感性较强，本方法的油样需采用标准物质。

沸石、金属有机骨架（MOF）、共价有机骨架（COF）和有机-无机杂化钙钛矿材料，最近因其复杂的结构和赋予新功能的通用性而受到广泛关注。然而，这些精细结构在电子束（e-beam）辐射下容易损坏，这给它们的表征带来了很大的困难。 针对此类样品，上海科技大学（通讯单位）与日本电子株式会社联合报告了一种方法，使用常规ADF/ABF就可以在极低电子剂量下对电子束敏感晶体进行成像。该文以Improving Data Quality in Traditional Low-dose Scanning Transmission Electron Microscopy Imaging为题发表在学术期刊?Particle & Particle Systems Characterization上。日本电子应用工程师王灵灵与上海科技大学蒋亦岚老师为共同第一作者，周毅老师与张青老师为共同通讯作者。