Clean-Label Starch Modifications: Dry Heat Treatment in Combination with Ion Exchange.

Area of Science:

• Food Science
• Materials Science

Background:

• Potato starch contains phosphorylated amylopectin chains, enabling mineral enrichment.
• Dry heat treatments (DHT) alter starch properties like viscosity and digestibility.
• Chemically modified starches are widely used but face demand for clean-label alternatives.

Purpose of the Study:

• To investigate the dual modification of potato starch using mineral enrichment and DHT.
• To fine-tune the functional properties, particularly rheology, of modified potato starches.
• To understand starch-ion interactions during DHT and their impact on starch properties.

Main Methods:

• Native potato starch underwent ion exchange with various cations (Na+, K+, Mg2+, Ca2+).
• The mineral-enriched starches were subjected to dry heat treatments (DHT) at specific temperatures, moisture levels, and durations.
• Rheological properties and starch digestibility were analyzed to evaluate the effects of the dual modification.

Main Results:

• DHT alone reduced viscosity and gelatinization temperatures while increasing digestible starch content.
• Prior ion exchange with Na+, K+, Mg2+, and Ca2+ enhanced the effects of DHT.
• Specific ion effects, following the Hofmeister series, influenced starch properties, with divalent cations (Mg2+, Ca2+) enabling ionic cross-linking.

Conclusions:

• Dual modification of potato starch with mineral enrichment and DHT offers tunable functional properties.
• The study elucidates starch-ion interactions during DHT, highlighting ion specificity and cross-linking effects.
• These novel starches present a promising clean-label alternative to chemically modified starches for the food industry.