Physicochemical, thermal and pasting characteristics of gamma irradiated rice starches

Published Date
April 2016, Vol.85:460–466, doi:10.1016/j.ijbiomac.2016.01.024

Title 

Physicochemical, thermal and pasting characteristics of gamma irradiated rice starches

• Author 

• Khalid Gul ^a,,
• AK Singh ^a
• RG Sonkawade ^b,c

• aDepartment of Processing & Food Engineering, Punjab Agricultural University Ludhiana 141 004, India
• bInter University Accelerator Centre, Formerly Nuclear Science Centre, Aruna Asif Ali Marg, New Delhi 110 067, India
• cDepartment of Physics, Shivaji University, Kolhapur 416 004, India

Received 12 October 2015. Revised 5 January 2016. Accepted 5 January 2016. Available online 8 January 2016.

Highlights

• •
  Rice starches isolated from two recently released varieties were gamma irradiated at 0, 2, 5 and 10 kGy.
• •
  Irradiation significantly reduced amylose content, pH and swelling index.
• •
  Pasting properties and retrogradation enthalpy decreased significantly with irradiation.
• •
  Particle size reduced with formation of small size granules.

Abstract

Starches isolated from two recently released rice cultivars (PR 121 and PR 116) grown in sub-tropical climates of Punjab, India were subjected to gamma irradiation at 0, 2, and 10 kGy doses using a Co⁶⁰ irradiator source. Physicochemical, thermal, pasting, and morphological properties were studied. Irradiation resulted in a significant decrease in apparent amylose content, swelling power and pasting properties. Carboxyl content and solubility increased with irradiation. The granule morphology was evaluated using scanning electron microscope, particle size analyzer and light microscope. Irradiation resulted in formation of small size granules. Granules were irregular and polyhedral in shape. The granule morphology and A-type X-ray diffraction pattern were not altered by irradiation.

Keywords

• Rice starch
• Irradiation
• Physicochemical properties

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• ⁎ 
  Corresponding author.

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