Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (21): 4454-4463.doi: 10.3864/j.issn.0578-1752.2011.21.014

• STORAGE·FRESH-KEEPING·PROCESSING • Previous Articles     Next Articles

Effect of Irradiation on the Molecular Weight and Structure and Rheological Behaviour of Xanthan Gum

 LI  Yan-Jie, HA  Yi-Ming, WANG  Feng, LI  Yong-Fu   

  1. 1.中国农业科学院农产品加工研究所/农业部农产品加工与质量控制重点实验室，北京 100193
    2.内蒙古工业大学化工学院，呼和浩特 010051
    3.上海理工大学医疗器械与食品学院，上海 200093
  • Received:2010-12-01 Online:2011-11-01 Published:2011-08-26

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Abstract: 【Objective】 The effects of irradiation dose on the molecular weight, molecular weight distribution, structures and rheological behaviour of xanthan gum were investigated for the purpose of applying irradiation technique to molecular modification of xanthan gum and even other polysaccharides. 【Method】 Xanthan gum was irradiated in dry state at different doses (0-400 kGy) of 60Co γ-rays to investigate the changes of the molecular weight, molecular weight distribution, structures and rheological behaviour of irradiated xanthan gum by using gel permeation chromatography (GPC), X-ray diffraction (XRD), fourier-transform infrared spectra (FTIR), ultraviolet-visible spectral (UV-vis) and rheometer. 【Result】 Results showed that the molecular weight and crystallinity of xanthan gum increased at 10 kGy, then decreased gradually with increasing  irradiation dose. Contrary to it, molecular weight distribution of irradiated xanthan gum decreased at 10 kGy, then increased gradually to maximum value at 50 kGy, and then decreased with irradiation dose. FT-IR spectra and XRD indicated that γ-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. The relationship between apparent viscosity of xanthan gum solution and shearing rate, shear time and temperature were varied significantly. 【Conclusion】 γ-irradiation can act simultaneously on crystallization area and amorphous area of xanthan gum, and cause polymerization or degradation of xanthan gum molecule, thus the molecular weight and molecular weight distribution, and then the rheological behaviour of irradiated xanthan gum were obviously changed.

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