2017/11/15 11:50
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产品配置单:
UV1700 系列紫外可见分光光度计
型号: UV1700
产地: 江苏
品牌: 南京科捷
¥1万 - 2万
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方案详情:
脱氢乙酸钠在食品加工业中常被用作防腐剂,我国国标GB2760中规定脱氢乙酸(钠)可用于酱菜、腐乳等食品中,其最大的用量为0.3g/kg,火腿肠中未允许使用。个别厂商为了提高产品的防腐效能,而又要避免所准许的添加剂的过量,常采取多种少量的添加方法,火腿肠中使用脱氢乙酸钠对人体健康构成严重的危害。目前国家规定脱氢乙酸钠的标准检测方法为气相色谱法,用液相色谱检验脱氢乙酸钠也有报道。而紫外分光法对火腿肠中脱氢乙酸钠的测定方法进行了研究,现报告如下:
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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
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市面上有众多的新冠病毒qPCR检测试剂盒,本应用方案采用韩国Seegene公司的AllplexTM 2019-nCoV检测试剂盒在耶拿荧光定量PCR仪 qTOWER³G上进行样品检测,获得符合预期的结果。
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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。
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2022/11/08