用Agilent 1120一体式液相色谱仪分析口香糖中的抗氧化剂

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

1、恒温槽采用铝块加热的方式，50~200℃范围内进行高精度温度调节。 2、反应柱分为内径3·5·10mmX长度50·100mm的六个种类，材质分为不锈钢材质和玻璃材质，玻璃反应柱适用于酸性样品的反应。 3、反应柱在恒温槽内的固定操作十分简单，只需一个拉杆动作即可完成安装。 4、样品导入端分为液相反应用和气液反应用2个种类（选购） 5、氢气、氧气、二氧化碳气的气体反应用大流量控制单元也可配备（选购）

超纯水机在后期使用中会因各种因素导致设备性能下降，所以为了确保延长设备的使用寿命，日常使用时就应该注意设备的维护和保养，那么导致超纯水机性能下降的因素有哪些呢?

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