Heat Resistance and Local Structure of FeCl2-Absorbed Crosslinked Poly(γ-Glutamic Acid)

T. Nishida; H. Kamezawa; T. Hara; Y. Matsumoto

doi:10.1023/a:1017917610485

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 250: Issue 3

Heat Resistance and Local Structure of FeCl₂-Absorbed Crosslinked Poly(γ-Glutamic Acid)

Authors:

T. Nishida

T. Nishida Kinki University Department of Biological and Environmental Chemistry, Kyushu School of Engineering Kayanomori 11-6 Iizuka 820-8555 Japan

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H. Kamezawa

H. Kamezawa Kyushu University Department of Chemistry, Faculty of Science Hakozaki 6-10-1 Fukuoka 812-8581 Japan

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T. Hara

T. Hara Kyushu University Division of Applied Genetic Resources, Department of Genetic Resources Technology, Faculty of Agriculture Hakozaki 6-10-1 Fukuoka 812-8555 Japan

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Y. Matsumoto

Y. Matsumoto Fukuoka University Department of Electrical Engineering, Faculty of Engineering Nanakuma 8-19-1 Fukuoka 814-0180 Japan

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Pages:: 547–550

Online Publication Date:: 29 Oct 2004

Publication Date:: 17 Dec 2001

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1017917610485

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Abstract

Fiber of Japanese food natto (Bacillus subtilis) is known to be superabsorbent poly(-glutamic acid) (PGA). NaCl particles precipitate in FeCl₂-absorbed crosslinked PGA when heated at crystallization temperature of 320 °C for 10 to 60 min. After heat treatment the Mössbauer spectrum of FeCl₂-crosslinked PGA consists of a quadrupole doublet due to FeCl₂·2H₂O. The Mössbauer spectrum of anhydrous FeCl₂ reagent heated under the same condition shows an intense sextet due to -Fe₂O₃ . These results prove that the superabsorbent polymer, crosslinked PGA, has higher heat resistance.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)