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Updated: Dec 14, 2025

Analysis and Specification of Starch Granule Size Distributions
Published on: March 4, 2021
Physicochemical Characteristics of Starch in Sweet Potato Cultivars Grown in Korea
Hyun-Joo Kim1, Koan Sik Woo2, Hyeong-Un Lee3
1Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Gyeonggi 16613, Korea.
Abstract:
The objective of this study was to investigate the structural and physicochemical properties of starch from seven sweet potato cultivars (Shinyulmi, Sinjami, Hogammi, Jeonmi, Jinyulmi, Juhwangmi, and Pungwonmi). Jeonmi and Jinyulmi had amylose contents of 40.04% and 37.39%, respectively, whereas Juhwangmi and Pungwonmihad amylose contents of 30.95% and 32.37%, respectively. As a result of amylopectin polymerization, the seven cultivars were found to have high (>48%) contents of the degree of polymerization (DP) 13∼24 fraction, whereas the DP≥37 fraction content was <3.45%. The level of resistant starch was highest in Jeonmi (>30%) and lowest in Pungwonmi (<5%). The in vitro digestibility of Pungwonmi was greater than that of the other cultivars. Starch X-ray patterns did not differ among the cultivars. The results of this study provide useful information for the food industry regarding the application of sweet potato starches.
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