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Waxy corn starch (WS) can form amylopectin-lipid complexes (ALCs), a type of resistant starch type 5 (RS5). Optimal conditions for ALC formation were boiling with 45 minutes of stirring, showing potential for food applications.

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Area of Science:

  • Food Science
  • Biochemistry
  • Material Science

Background:

  • Resistant starch type 5 (RS5) is typically formed by amylose-lipid complexes.
  • Amylopectin-rich starches are being explored as alternative sources for RS5 through amylopectin-lipid complexes (ALCs).

Purpose of the Study:

  • To investigate the formation of ALCs in waxy corn starch (WS) with oleic acid.
  • To determine the optimal thermal and mechanical conditions for ALC formation in WS.

Main Methods:

  • Waxy corn starch (WS) was treated with oleic acid (10% w/w) under varying temperatures (80°C, 85°C, boiling) and stirring times (0, 45 min).
  • Techniques used included complexation index (CI) measurement, Differential Scanning Calorimetry (DSC), Fourier-Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD).

Main Results:

  • Significant ALC formation was observed, with a peak complexation index (CI) of 59% achieved under boiling conditions with 45 min of stirring.
  • DSC showed a distinct endothermic transition at 110°C, FTIR confirmed starch-lipid interactions, and XRD revealed V-type diffraction patterns indicative of complexation.

Conclusions:

  • Waxy corn starch (WS) effectively forms amylopectin-lipid complexes (ALCs) under specific processing conditions.
  • ALCs represent a promising source of resistant starch type 5 (RS5) with potential applications in the food industry due to their stability and health benefits.