Resazurin
Title: Resazurin
CAS Registry Number: 550-82-3
CAS Name: 7-Hydroxy-3H-phenoxazin-3-one 10-oxide
Additional Names: "diazoresorcinol"; resazoin
Molecular Formula: C12H7NO4
Molecular Weight: 229.19
Percent Composition: C 62.89%, H 3.08%, N 6.11%, O 27.92%
Literature References: Prepn from resorcinol: Rast et al., DE 961829 (1957 to Bayer), C.A. 53, 15098 (1959).
Properties: Dark red, small crystals with greenish luster. Insol in water, ether; sparingly sol in alcohol, glacial acetic acid; sol in dil alkali hydroxides.
Use: As indicator, using a soln of 0.1 g in 20 ml 0.1N NaOH, and water to make 500 ml. pH: 3.8 orange, 6.5 dark violet. In the detection of hyposulfite (sulfoxylate). In food research (reductase test).

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