Modification of potato starch by using superheated steam

Area of Science:

• Food Science and Technology
• Biochemistry
• Materials Science

Background:

• Conventional hydrothermal modification of starches is inefficient, requiring significant time and energy.
• Potato starch (PS) is a widely used polysaccharide with diverse applications.
• Developing efficient modification methods for starch is crucial for food processing and material science.

Purpose of the Study:

• To investigate the efficacy of superheated steam (SS) as a novel modification method for potato starch (PS).
• To analyze the impact of SS treatment at varying temperatures on the structural and physicochemical properties of PS.
• To evaluate the potential of SS treatment for enhancing resistant starch content in PS.

Main Methods:

• Potato starch (PS) was treated with superheated steam (SS) at temperatures ranging from 100°C to 160°C for 1 hour.
• Structural analysis focused on long- and short-range molecular order and granular integrity.
• Physicochemical properties, including swelling power, solubility, viscosity, and digestibility, were evaluated.

Main Results:

• SS treatment disrupted the long- and short-range molecular structures of PS without altering its granular form.
• Swelling power, solubility, and peak viscosity decreased, while pasting temperature, final viscosity, and setback increased with SS treatment.
• SS treatment at 100°C and 120°C effectively converted over 9% of slowly digestible starch into resistant starch.

Conclusions:

• Superheated steam (SS) treatment is a highly efficient and rapid method for modifying potato starch (PS) properties.
• The degree of structural modification can be controlled by adjusting the SS treatment temperature.
• SS treatment presents a promising, energy-efficient alternative to conventional hydrothermal methods for starch modification, particularly for increasing resistant starch content.