کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9560855 | 1382007 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Degradation of carrageenan by radiation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
κ-, ι- and λ-Carrageenans were degraded by irradiation with gamma rays in the solid state, gel state or solution with various doses in air at ambient temperature. The molecular weights obtained were in the range of 10.5 Ã 104 to 0.8 Ã 104 of narrow molecular weight distribution. The chemical structural changes of carrageenans were accompanied by appearance of UV absorbance peak at 260 nm and a characteristic FT-IR band at 1728 cmâ1. Due to radiation-induced desulfation, carrageenan oligomer has lower sulfate content. From comparison of radiation degradation yield (Gd), susceptibility to degradation of the three types of carrageenans in aqueous form follows the order of λ > ι > κ which could have been influenced by their conformational state. The oligomer obtained from κ-carrageenan with molecular weight of 1.0 Ã 104 showed a strong growth promotion effect on potato in tissue culture. Degradation of κ-carrageenan solution using vessel-type low energy electron beam accelerator (LEEB) (250 kV, 10 mA) was investigated. LEEB irradiation reduced the molecular weight of carrageenan though the electron beams have a depth penetration range of less than 3 mm in distilled water.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 87, Issue 3, March 2005, Pages 403-410
Journal: Polymer Degradation and Stability - Volume 87, Issue 3, March 2005, Pages 403-410
نویسندگان
L. Relleve, N. Nagasawa, L.Q. Luan, T. Yagi, C. Aranilla, L. Abad, T. Kume, F. Yoshii, A. dela Rosa,