Resistant Starch Type 5 Formation by High Amylopectin Starch-Lipid Interaction

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.