Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (S1): S010301

• NUCLEAR CHEMISTRY,RADIOCHEMISTRY,RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Degradation of chitosan for rice crops application

Norzita Yacob, Maznah Mahmud, Norhashidah Talip, Kamaruddin Hashim, Abdul Rahim Harun, Khairul Zaman, Hj Dahlan   

  1. Malaysian Nuclear Agency, 43000 Kajang, Selangor, MALAYSIA
  • Contact: Norzita Yacob E-mail:norzita@nuclearmalaysia.gov.my
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Norzita Yacob, Maznah Mahmud, Norhashidah Talip, Kamaruddin Hashim, Abdul Rahim Harun, Khairul Zaman, Hj Dahlan. Degradation of chitosan for rice crops application.Nuclear Science and Techniques, 2013, 24(S1): S010301
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Abstract:

A variety of techniques including chemical and enzymatic hydrolysis, and radiation degradation processes can be used to prepare low molecular weight chitosan. Degradation of chitosan by radiation can be carried out in solid state and liquid state. Radiation degraded polysaccharides has been reported to exhibit growth-stimulating activity like phytohormones thatinduce the promotion in germination, shoot and root elongation in variety of plants. In this study, the chitosan was irradiated in solid state (powder form) by gamma rays within the dose range of 25?75 kGy. And the irradiated chitosan was then irradiated in solution form in the presence of hydrogen peroxide. The effects of irradiation on the molecular weight and viscosity of the chitosan were investigated using Ubbelohde Capillary Viscometer. The molecular weight and viscosity of the chitosan decreased with increment of absorbed doses. In the presence of hydrogen peroxide, the molecular weight of chitosan could be further decreased. The effect of radiation degraded chitosan on the growth promotion of rice was investigated and it was shown during seedling period of 15 days for transplanting whereby the growth is 15%?20% faster than using chemicals growth promoters.

Key words: Radiation, Degradation, Rice crops, Growth promoter