Method for producing physically modified starch using heating and freeze-thaw cycles with the addition of various edible gums

Clean-label modified starch with amylose re-associated through swelling temperature heating with gum addition and freeze-thaw cycles

This technology is a method for producing physically modified starch by mixing amylose-containing starch with a small amount of edible gum, heating it at a swelling temperature below the gelatinization point, and then sequentially cooling, freezing, thawing, and drying it to alter its physical properties. Amylose released during the heating stage re-associates during the subsequent freezing, thawing, and drying processes, resulting in properties different from the original starch.

Natural starch is sensitive to heat and agitation, prone to retrogradation, and exhibits unstable gel formation and low storage stability, making it difficult to use directly in the food industry. While chemical modification is effective, it raises concerns about chemical residues. Most recently developed physical modification methods require expensive mechanical equipment, and conventional freeze-thaw treatments often damage starch granules due to pressure, which can actually reduce thermal stability.

This technology involves adding hydrophilic gums such as xanthan, guar, gum arabic, or carboxymethyl cellulose and using temperatures below the gelatinization point to alter the internal structure while maintaining the starch granule shape. It can be applied to corn, waxy corn, potato, and tapioca starches, with drying options including natural, freeze, vacuum, or constant temperature/humidity methods. Suitable for sauce and soup thickeners, refrigerated or frozen rice cakes and noodles, and dessert gels, it enables low-cost production of clean-label starch that resists heat and agitation and maintains gel integrity without chemical additives.

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Key Features:

• Preparing a starch-gum mixture by adding 0.2 to 0.4% gum (based on starch weight) to amylose-containing starch
• Heating the starch-gum mixture at a swelling temperature of 55 to 60°C, which is below the gelatinization temperature, to induce amylose leaching
• Cooling after heating, freezing for 30 minutes to 12 hours, and then thawing at 20 to 30°C
• Drying after thawing at a temperature below the gelatinization point to re-associate the leached amylose and obtain the modified starch

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