Uranine also known as Acid Yellow 73, is a phthalic indicator dye that appears orange-red to dark red in color. It is a water-soluble and fluorescent dye. It is used as a fluorescent tracer and exhibits the highest levels of fluorescence in the pH range of 6 to 11.
The Indian patent office has granted a patent to Macsen Drugs, a unit of the Macsen Labs group. The patent relating to the field of chemistry is titled “Process for the preparation of crystalline fluorescein Sodium from diacetylfluorescein or Fluorescein”. The patent concerns a novel process for synthesizing the compound Fluorescein Sodium. Read More.
|PRODUCT NAME||Acid Yellow 73|
|SYNONYMS||Uranin, Soap Yellow, Fluorescein Sodium, water soluble fluorescein, C.I 45350|
|Color Index No||45350|
|1.||DESCRIPTION||Orange Red Powder, Odourless & Hygroscopic|
|2.||L.O.D. AT 105 C.||≤5.0%|
|3.||COMBINED ETHER EXTRACT, % BY MASS MAX.||0.5% Max.|
|4||DYE INTERMEDIATES, % BY MASS MAX.||2.0 % Max.|
|5||FLUORESCENCE||λ max 460 nm , λ max 515 nm|
(E1% in a 1 cm cell in distilled water)
|λ max. At 490 nm ± 2 nm|
|7||ABSORBANCE at λ max.
(of 0.004mg/ml solution in distilled water at 9pH
& 1 cm path length in quartz cuvette)
|Between 0.8 to 0.912|