Effect of gamma irradiation on rheological properties of polysaccharides exuded by A. fluccosus and A. gossypinus

Samira Alijani, Sima Balaghi, Mohammad Amin Mohammadifar

Research output: Contribution to journalJournal articleResearchpeer-review


In this study, Iranian gum tragacanth (GT) exudates from Astragalus fluccosus (AFG) and Astragalus gossypinus (AGG) were irradiated at 3, 7, 10 and 15 kGy. Fourier transform infrared spectroscopy (FTIR) data showed that irradiation did not induce changes in the chemical structure of either type of gum. Although particle size distribution and both steady shear and dynamic rheological properties were considerably affected by the irradiation process, the magnitude of the effect of irradiation on each of the theological and size variables was different for the hydrocolloids. For instance, for AGG, increasing the irradiation dose from 3 to 10 kGy, the d(0.5) and D[3,2] values were reduced by one-sixth to one-eighth fold. Colour measurement revealed that the radiation process led to an increase in the yellow index and b* values for both types of GT in powder form, but it was more pronounced for AGG samples. Irradiation led to an approximate 13-fold increase in redness in AFG. Surface and shape changes of the gum crystals were studied by scanning electron microscope (SEM) and a smoother surface for irradiated samples was detected. The notable changes in functional properties of each variety of irradiated gum should be taken into consideration before using the radiation technology as a commercial tool for sterilisation. (C) 2011 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalInternational Journal of Biological Macromolecules
Issue number4
Pages (from-to)471-479
Number of pages9
Publication statusPublished - 2011
Externally publishedYes


  • Biochemistry
  • Molecular Biology
  • Structural Biology
  • Frequency sweep
  • FTIR
  • Gamma irradiation
  • Gum tragacanth
  • Particle size distribution
  • Viscosity
  • gum tragacanth
  • article
  • Astragalus fluccosus
  • Astragalus gossypinus
  • Astragalus plant
  • chemical structure
  • colorimetry
  • conformational transition
  • controlled study
  • crystal
  • dynamics
  • flow kinetics
  • food irradiation
  • gamma irradiation
  • hydrocolloid
  • infrared spectroscopy
  • Iran
  • nonhuman
  • particle size
  • plant exudate
  • radiation dose
  • radiation response
  • scanning electron microscopy
  • shear rate
  • species comparison
  • varietas
  • viscoelasticity
  • Astragalus Plant
  • Color
  • Elastic Modulus
  • Elasticity
  • Gamma Rays
  • Models, Chemical
  • Particle Size
  • Rheology


Dive into the research topics of 'Effect of gamma irradiation on rheological properties of polysaccharides exuded by A. fluccosus and A. gossypinus'. Together they form a unique fingerprint.

Cite this