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γ-Ray Irradiation Practical Conditions for Low Molecular Weight Chitosan Material Production

Published online by Cambridge University Press:  01 February 2011

Rangrong Yoksan ,
Mitsuru Akashi ,
Mikiji Miyata ,
Siriratana Biramontri  and
Suwabun Chirachanchai
Rangrong Yoksan
Affiliation:
The Petroleum and Petrochemical College, Chulalongkorn University, Phya Thai, Bangkok 10330, THAILAND
Mitsuru Akashi
Affiliation:
Graduate School of Engineering, Osaka University, Yamada, Suita, Osaka 565–0871, JAPAN
Mikiji Miyata
Affiliation:
Graduate School of Engineering, Osaka University, Yamada, Suita, Osaka 565–0871, JAPAN
Siriratana Biramontri
Affiliation:
Office of Atomic Energy for Peace, Ministry of Science and Technology, Bangkok 10900, THAILAND
Suwabun Chirachanchai
Affiliation:
The Petroleum and Petrochemical College, Chulalongkorn University, Phya Thai, Bangkok 10330, THAILAND
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Abstract

The present work focuses on the γ-ray irradiation doses and conditions (dry solid state, solid state dispersing in 0.5–2 % aqueous H2O2 solution, solid state dispersing in 1% aqueous acetic acid, and 2% aqueous K2S2O8) to determine the level that the molecular weight of chitosan is lowered significantly without changing its primary structure. Molecular weight of chitosan (105-106 Dalton) is reduced approximately 50% under the γ-ray dose of 20 kGy in the dry solid state. The decrease in molecular weight is enhanced up to 80% when chitosan is suspended in 0.5–2 % aqueous H2O2 solution during γ-ray irradiation. In either condition, the backbone structure of the irradiated product is maintained with little change in the terminal chain. In the cases of (i) chitosan suspended in 2% aqueous K2S2O8 and (ii) chitosan in 1% aqueous acetic acid, chitosans lose their primary structures and physical properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 792: Symposium R – Radiation Effects and Ion Beam Processing of Materials , 2003 , R5.10
Copyright
Copyright © Materials Research Society 2004

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References

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