Effect of irradiation on the molecular weight, structure and apparent viscosity of xanthan gum in aqueous solution
文献类型: 外文期刊
作者: Li Yan-jie 1 ; Ha Yi-ming 1 ; Wang Feng 1 ; Li Yong-fu 3 ;
作者机构: 1.Chinese Acad Agr Sci, Inst Agrofood Sci & Technol, Key Lab Agr Prod Proc & Qual Control, Minist Agr, Beijing 100193, Peoples R China
2.Inner Mongolia Univ Technol, Chem & Engn Inst, Hohhot 010051, Inner Mongolia, Peoples R China
3.Univ Shanghai Sci & Technol, Sch Med Instrument Food Engn, Shanghai 200093, Peoples R China
关键词: Xanthan gum;Irradiation;Molecular weight;Structure;Apparent viscosity
期刊名称:ADVANCED MATERIALS, PTS 1-4
ISSN: 1022-6680
年卷期: 2011 年 239-242 卷
页码:
收录情况: SCI
摘要: Xanthan gum samples were irradiated in aqueous solution at different doses (0-120 kGy) of 60Co gamma-rays. The changes of molecular weight and structures of irradiated xanthan gum samples were investigated and characterized by using gel permeation chromatography(GPC), X-ray diffraction (XRD), fourier-transform infrared spectra (FTIR), ultraviolet visible spectral (UV-vis) analysis and rheometer. Results showed the molecular weight decreased gradually with increasing irradiation dose. The radiation chemical yields G(d) of xanthan gum was 26.55. FTIR spectra and XRD indicated that gamma-irradiation introduced no significant changes into the structure and crystal texture, but UV spectra showed a distinct absorption peak at about 265 nm, increasing with irradiation dose, which was attributed to the formation of carbonyl groups or double bond. Apparent viscosity of xanthan gum solution decreased with increasing irradiation dose and remain basically constant with the prolonging of shear time after irradiation.
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