Studies on the Metal-Protein Complex. IX. : Reaction between the Polypeptides and Metals

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Iron, copper, zinc, and magnesium combined with poly L-Glu (poly L-glutamic acid) in metal concentration of 100ppm at 50°C for 20hr. Iron combined almost with poly L-Glu. In the metal concentration of 1000ppm, Cu-poly L-Glu and Zn-poly L-Glu complexes formed the precipitate, but Fe-poly L-Glu complex did not form the apparent precipitate. In the mixture of Mg and poly L-Glu, no precipitate was formed. Cu-poly L-Glu mixture gave the absorbance of 250 and 700nm. In IR spectra, the absorbance of 1580cm-1 decreased in order of Mg-poly L-Glu mixture, Fe-poly L-Glu, Cu-poly L-Glu, and Zn-poly L-Glu complex. On the contrary, the absorbance of 1540cm-1 increased in above order. Iron did not combine almost with poly L-Lys, but copper and zinc combined. Cu-poly L-Lys and Mg-poly L-Lys mixtures gave new absorbance at 1120cm-1.
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