S-Space College of Agriculture and Life Sciences (농업생명과학대학) Program in Agricultural Biotechnology (협동과정-농업생물공학전공) Theses (Master's Degree_협동과정-농업생물공학전공)
Characterization of Korean sweet potato starches: physicochemical, pasting, and digestion properties
한국산 11 품종 고구마 전분의 이화학 · 호화 및 소화 특성 연구
- 농업생명과학대학 협동과정 농업생물공학전공
- Issue Date
- 서울대학교 대학원
- sweet potato starch; digestibility; slowly digestible starch; resistant starch; pasting properties
- 학위논문 (석사)-- 서울대학교 대학원 : 협동과정 농업생물공학전공, 2013. 2. 문태화.
- Physicochemical, pasting, and digestion properties of Korean sweet potato starches were investigated. Sweet potato starch granules were oval, round, polygonal, spherical, and bell-shaped and of 10.2-15.3µm in mean particle diameter. The average particle size of Jeongmi was the highest, while Daeyumi was the lowest. Amylose content of the sweet potato starches varied from 12.3 to 17.4%. Jeongmi showed the highest values for Mw (14.6ⅹ107g/mol), whereas Daeyumi had the lowest (7.2ⅹ107g/mol). A similar chain length distribution of amylopectin was found in 11 sweet potato starches. The portion of B3 (DP≥37) correlated (r=0.66, p<0.01) with the amount of leached amylose. Thermal properties of DSC showed the high values of To, Tp, and Tc in Shinyulmi and Jeongmi, but a relatively low value in Daeyumi. All sweet potato starches exhibited a characteristic Ca-type diffraction pattern. Different patterns were revealed among the swelling factors of sweet potato starches depending on temperature. The contents of rapidly digestible starch (RDS), slowly digestible starch (SDS) and resistant starch (RS) in sweet potato starches ranged from 9.6 to 17.4%, 31.4 to 45.6%, 35.7 to 62.8%, respectively. Shinyulmi and Happymi had the highest SDS, and Jeongmi had the highest RS. According to the Rapid visco analyzer (RVA) viscosity profiles, differences were observed in pasting parameters such as pasting temperature, peak viscosity, final viscosity and breakdown. Happymi showed the highest breakdown, and lowest final viscosity, setback, pasting time, and pasting temperature.