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Effect of Mixed Liquid Carrier on the Crystalline Structure of Corn Starch Granules after High Pressure Jet Homogenization

LIU Bin,ZHANG Yuan,FENG Tao,WU Xue   

  1. College of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China
  • Online:2013-09-15 Published:2013-09-27
  • Contact: LIU Bin

Abstract:

The effects of pure water and mixed (0.24% ethanol in water) media on the efficacy of high pressure jet
homogenization to micronize corn starch granules were explored. Under the identical operating conditions, water was the
least effective for damaging the crystalline structure of corn starch. However, in the aqueous ethanol medium, the crystalline
structure of corn starch was seriously damaged due to the enhanced cavitation and thus the increased gas–liquid–solid
impact. Scanning electron microscopic (SEM) observations indicated that surface flaking of corn starch granules happened
with micro-debris adhering to the surface of the granules. Polarized light microscopic (PLM) analysis exhibited the damaged
crystalline structure of corn starch. Differential scanning calorimetry (DSC) demonstrated that both the native granular
structure and crystalline arrangement (compact) were altered.

Key words: high pressure jet homogenization, cavitation, corn starch, structure, differential scanning calorimetry (DSC)

CLC Number: