Abstract
This study investigate the changes in the flow properties of Chenopodium album starch (CAS) after modification through Quasi Emulsion Solvent Diffusion (QESD), Octenyl Succinic Anhydride (OSA) and Heat Moisture Treatment (HMT). The native starch’s Carr’s index (36.92% ) and Hausner Ratio (1.55) indicates poor flowability as compared to modified starch showing fair flowability. The caking strength and cohesion index after modification decreased from 1072.67 to 222.00 g.mm and 15.37 to 8.48 g.mm, respectively. Shear properties assessed at three different pressures (3, 6 and 9 kPa) showed that native CAS was less flowable (COF 22.8 at 6 kPa) than modified (COF 26.9 at 6 kPa), making bulk handling harder. The surface roughness value of the powder as measured by Atomic Force Microscopy found to be lesser in modified starch (92.49 μm) in comparison to native starch (117.60 μm ). The Scanning Electron Microscope revealed the formation of spherical, smooth oval and regular shaped starch particles after modification. X-Ray Diffraction analysis showed an improvement in crystallinity from 20.01 to 29.86% after modification. Conclusively, QESD treatment significantly improved the flow properties of Chenopodium album starch in comparison of HMT and OSA treatment.
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