Solid, water-insoluble polypeptides having ionizable side chains

Solid bodies of polypeptides having repeating units of aspartic, glutamic, and aminoadipic esters are reacted with hydrazine or an amine having at least two NH2 groups until the ester moieties of the side chains are partly converted to the hydrazines or amides, and the side chains are partly crossli...

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Bibliographische Detailangaben
Hauptverfasser:	AKAMATSU, AKIRA, MATSUSHITA, KATSUNOBU, KOIZUMI, SADAO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE WORKING-UP
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Beschreibung
Zusammenfassung:	Solid bodies of polypeptides having repeating units of aspartic, glutamic, and aminoadipic esters are reacted with hydrazine or an amine having at least two NH2 groups until the ester moieties of the side chains are partly converted to the hydrazines or amides, and the side chains are partly crosslinked hydrazides other units by reaction with the hydrazine or diamine so as to make the polypeptide insoluble and infusible. The remaining ester moieties are saponified, and the resulting hydrophilic, but water-insoluble solid acts as an ampholyte in contact with water or other polar solvents. It may be used for capturing heavy metal ions from their aqueous solutions.