Production and Cytotoxicity of Extracellular Insoluble and Droplets of Soluble Melanin by Streptomyces lusitanus DMZ-3

Table 3

Chemical analysis of the pigments.

Color and reactions	Observations
	Pigment 1	Pigment 2
Color	Blackish brown	Blackish brown
Solubility in water	Insoluble	Soluble
Solubility in 0.1 N NH4OH	Readily soluble	Readily soluble
Solubility in 0.1 N NaOH	Soluble	Soluble
Solubility in 0.1 N KOH	Soluble	Soluble
Solubility in organic solvents; (Ethanol, acetone, chloroform, benzene)	Insoluble	Insoluble
Reaction with sodium dithionite and with potassium ferricyanide	Decolorized and turned to brown	Decolorized and turned to brown
Reaction with H2S	Reduced	Reduced