Reactive Blue 4 sodium 

Reactive Blue 4 sodium is an anthraquinone dye used extensively in the textile industry. Reactive Blue 4 sodium is a single colorimetric chemosensor for sequential determination of multiple analytes with different optical responses in aqueous media^[1][2][3].

Reactive Blue 4 (50 μM) sodium 可连续检测水 (10.0 mM HEPES 缓冲液，pH 7.0) 中的铜离子 (Cu²⁺)、L-精氨酸 (Arg) 和 L-半胱氨酸 (Cys)。首先，Cu²⁺ 的存在引起肉眼可见的颜色变化，光谱根据结合位点-信号亚基方法发生变化。随后，Reactive Blue 4-Cu²⁺ 复合物通过不同的识别途径成功应用于 Cys 和 Arg 的检测^[1]。
Reactive Blue 4 sodium 的水溶液呈深蓝色，其紫外-可见光谱在 607 nm 处出现吸收峰。随着 Cu²⁺ 离子逐渐加入 Reactive Blue 4 sodium 溶液中，溶液的波长从 607 nm 略微红移至 619 nm，且 607 nm 处的吸光度逐渐减弱，同时颜色变为深天蓝色。此外，滴定过程中在 645 nm 处出现等吸光点，表明已形成单一组分^[1]。
Reactive Blue 4 sodium 是一种常见的纺织染料，可以通过静电相互作用吸附在单壁碳纳米管 (SWCNT)上，从而实现残留染料的分离^[3]。

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

681.39

C₂₃H₁₂Cl₂N₆Na₂O₈S₂

4499-01-8

Room temperature in continental US; may vary elsewhere.

Please store the product under the recommended conditions in the Certificate of Analysis.

• [1]. Reactive Blue 4 as a Single Colorimetric Chemosensor for Sequential Determination of Multiple Analytes with Different Optical Responses in Aqueous Media: Cu2+-Cysteine Using a Metal Ion Displacement and Cu2+-Arginine Through the Host-Guest Interaction.  [Content Brief]

  [2]. Chaudhari AU, et al. Effective biotransformation and detoxification of anthraquinone dye reactive blue 4 by using aerobic bacterial granules. Water Res. 2017 Oct 1;122:603-613.  [Content Brief]

  [3]. Machado FM, et al. Adsorption of Reactive Blue 4 dye from water solutions by carbon nanotubes: experiment and theory. Phys Chem Chem Phys. 2012 Aug 21;14(31):11139-53.  [Content Brief]