2017/12/16 12:02
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产品配置单:
PEEK高压恒流泵
型号: HX-DVP10
产地: 湖北
品牌: 恒信
¥1 - 2万
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武汉恒信 HX-2000(II)型柱后衍生反应器
型号: HX-2000(II)
产地: 湖北
品牌: 恒信
¥5万 - 10万
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方案详情:
用高效液相色谱法柱后衍生荧光测定伏格列波糖片有关物质及含量。方法:以不同浓度的辛烷磺酸钠磷酸盐缓冲液(pH3.5)为流动相,检测波长:激发光波长350nm,发射光波长430nm,柱后衍生。调节流速使伏格列波糖峰保留时间约为20分钟时(有关物质),使伏格列波糖峰保留时间约11分钟时(含量测定),荧光试剂溶液的流速与流动相的流速相同,反应浴温度为100℃,冷却浴温度约为15℃。结果:本品有关物质测定时,主峰与杂质峰能较好的分离,含量测定回收率为100.2%,RSD=1.06%(n=6),重复性试验RSD=1.23%(n=6)。结论:该法快速简便,精密度高,分离效果好,结果准确.
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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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城市污水中TOC与COD的关系
TOC与COD的测定方法不同。测定COD是采用强氧化剂和加热回流的方法,只能将水中的有机物部分氧化(氧化率较低),并且测定时间较长,即使目前一些快速的
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2017/11/16
4D-脂质组学高通量工作流程
Lipid profiling from complex lipid extracts can be a challenging and time consuming task. The high complexity of samples and co-elution of isobaric or isomeric compounds complicate the confident annotation of lipids. The presented 4D-Lipidomics workflow simplifies and streamlines the annotation and validation process using mobility-enhanced MS data.
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基于紫外分光光度法的水中油测试方法
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。
环保
2021/05/31