hematin (hem'at-in)

Syn.: oxy hematin. 1. A dark brown amorphous substance (formula, probably, C^Hs^FeOs) obtained by treating a solution of hemoglobin with acetic acid. Found in the feces after hemorrhage of the intestinal tract. Compounded with the protein of the blood, it constitutes the oxyhemoglobin, and with chlorin, iodin, and bromin it forms hemin crystals. Upon oxidation it yields the imid of hematinic acid. 2. Of Chevreul, see hematoxylin. acid h. The product formed by di olving h. in an acid, actinic h. Of MacMunn, the intrinsic coloring matter of the ti ues of the Actinae. alkaline h. A solution of h. in an alkali, h. bromid, h. chlorid, h. hydriodid, h. hydro bromid, h. hydro chlorate, h. hydro chlorid, h. iodid. See hemin. iron-free h. See hematoporphyrin. reduced h. See hemochromogen. uroh. A bright red, non-crystallizable organic compound, highly soluble in chloroform, alcohol, ether, and alkalis; insoluble in acids. It is obtained from fresh urine. [Gr., aim a, blood.]