Physical and thermal properties of three sweetpotato cultivars (Ipomoea Batatas L.)

Abstract

Physical and thermal properties of three commonly grown sweetpotato cultivars were evaluated. Density, specific heat, thermal conductivity, and respiration rate were determined for ‘Beauregard’, ‘Hernandez’, and ‘Jewel’ varieties. In addition, respiration heat and thermal diffusivity were calculated for these cultivars. Uncured and cured sweet potato were evaluated and held under controlled storage conditions. Postharvest treatment and cultivar differences had minor effects on the density, specific heat, and thermal conductivity of sweetpotato. Respiration rate of the uncured and cured sweetpotato was evaluated at four temperatures: 15, 20, 25, and 30°C. Respiration rate and respiration heat for the cured sweetpotato was less than that of the uncured sweet potatoes. Results from this study will be instrumental in the design and optimization of sweetpotato curing and storage facilities and in the development of new quality indicators.