英文名称:DTNB 中文名称:5,5-二硫代双(2-硝基苯甲酸) 分子式:C14H8N2O8S2 分子量:396.34 外观:浅黄色结晶粉末 说明:DTNB为Ellman试剂。它用于比色法测定生物样品中巯基。它易溶于水。在巯基化合物的存在下,无色的DTNB将被转变成黄 色的5-巯基-2-硝基苯甲酸。由于5-巯基-2-硝基苯甲酸在412 nm处具有最大吸收,DTNB的吸收光谱并不干扰巯基的测定。 配置方法:准确称取0.198gDTNB用50mMNa2HPO4(pH=7.0)配制成50ml溶液,存放于棕色瓶中,于暗处低温保存备用。应该注意的是配置缓冲、浓度,储存时要避免见光。 Simga相关产品资料 Sigma D8130 5,5′-Dithiobis(2-nitrobenzoic acid) ≥98% (TLC), suitable for determination of sulfhydryl groups Synonym: 3-Carboxy-4-nitrophenyl disulfide, 6,6′-Dinitro-3,3′-dithiodibenzoic acid, Bis(3-carboxy-4-nitrophenyl) disulfide, DTNB, Ellman’s Reagent CAS Number: 69-78-3 Linear Formula: [-SC6H3(NO2)CO2H]2 Molecular Weight: 396.35 Beilstein Registry Number: 1896821 EC Number: 200-714-4 MDL number: MFCD00007140 PubChem Substance ID: 24894189 Description Application A sensitive reagent for measuring the free sulfhydryl content in proteins, peptides, and tissues. Properties assay ≥98% (TLC) mp 240-245 °C (dec.)(lit.) suitability suitable for determination of sulfhydryl groups Safety Personal Protective Equipment dust mask type N95 (US), Eyeshields, Gloves Hazard Codes Xi Risk Statements 36/37/38 Safety Statements 26-36 WGK Germany 3 RTECS DG9650000 |