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A Differential Scanning Calorimetry Study on the Effect of Annealing on Gelatinization Behavior of Corn Starch

B. Krueger, Clarence A. Knutson, George E. Inglett, C. E. Walker

Open publisher page 321 citations

Abstract

ABSTRACT Gelatinization characteristics of laboratory‐isolated and commercial corn starch were compared by differential scanning calorimetry (DSC) before and after being annealed at subgelatinization temperatures in excess water. Prior to annealing, commercial corn starch has a relatively narrow gelatinization range, with a peak temperature at 71°C. Starches isolated in the laboratory have wide gelatinization ranges and lower peak temperatures. After annealing, commercial starch showed little change in gelatinization characteristics, whereas laboratory starches all had narrowed gelatinization ranges, higher peak temperatures, and increased gelatinization enthalpy, indicating changes in the internal structure of the starch granules. This demonstrates that the wet‐milling process anneals corn starch during the isolation procedure.

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ABSTRACT Gelatinization characteristics of laboratory‐isolated and commercial corn starch were compared by differential scanning calorimetry (DSC) before and after being annealed at subgelatinization temperatures in excess water. Prior to annealing, commercial corn starch has a relatively narrow gelatinization range, with a peak temperature at 71°C. Starches isolated in the laboratory have wide gelatinization ranges and lower peak temperatures. After annealing, commercial starch showed little change in gelatinization characteristics, whereas laboratory starches all had narrowed gelatinization ranges, higher peak temperatures, and increased gelatinization enthalpy, indicating changes in the internal structure of the starch granules. This demonstrates that the wet‐milling process anneals corn starch during the isolation procedure.

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Available abstract

ABSTRACT Gelatinization characteristics of laboratory‐isolated and commercial corn starch were compared by differential scanning calorimetry (DSC) before and after being annealed at subgelatinization temperatures in excess water. Prior to annealing, commercial corn starch has a relatively narrow gelatinization range, with a peak temperature at 71°C. Starches isolated in the laboratory have wide gelatinization ranges and lower peak temperatures. After annealing, commercial starch showed little change in gelatinization characteristics, whereas laboratory starches all had narrowed gelatinization ranges, higher peak temperatures, and increased gelatinization enthalpy, indicating changes in the internal structure of the starch granules. This demonstrates that the wet‐milling process anneals corn starch during the isolation procedure.

Key concepts: Differential scanning calorimetry, Starch gelatinization, Starch, Enthalpy, Annealing (glass), Materials science, Corn starch, Calorimetry

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