| Description | Sudan III (Solvent Red 23) is a solvent dye used to color nonpolar substances. |
| In vitro | Sudan III 在少量硫酸作用下颜色从橙色变为蓝色，其在乙腈溶液中对于观察颜色变化现象最为适宜。通过(1)H-NMR和UV-Vis光谱学研究表明，Sudan III 与硫酸作用导致颜色变化的机制是由于硫酸对该染料的质子化作用所致。 |
| Synonyms | Solvent Red 23, Tetrazobenzene-β-naphthol, 111440 Red, Sudan Red III, 苏丹红Ⅲ |
| molecular weight | 352.39 |
| Molecular formula | C22H16N4O |
| CAS | 85-86-9 |
| Storage | keep away from direct sunlight | Powder: -20°C for 3 years | In solvent: -80°C for 1 year | Shipping with blue ice. |
| Solubility | DMSO: 5 mg/mL (14.18 mM), Sonication is recommended. |
| References | 1. Sakurai T , Kurata S , Ogino K . Color Change of Sudan III against Concentrated Sulfuric Acid in Acetonitrile and Quantification for a Small Amount of Concentrated Sulfuric Acid[J]. Analytical Sciences, 2016, 32(2):129-133. |