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Degradation of chitosan for rice crops application

Nuclear Science and Techniques 2013年第B12期24卷 14-18页

作者： norzita yacob maznah mahmud norhashidah talip kamaruddin hashim abdul rahim harun khairul zaman hj dahlan Malaysian Nuclear Agency 43000 Kajang Selangor MALAYSIA

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. © 2013, Science Press. All rights reserved.

关键词：降解壳聚糖脱乙酰壳多糖毛细管粘度计低分子量辐射降解应用作物水稻

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