Catherine Brabet · Miriam Hubinger. . A special sweet- potato cultivar in Japan named Quick Sweet has starch gelatinization temperature of < 50°C and short cooking time. Hence, carrier agents play a critical role in changing the properties of spray dried powder. Sorption. Short amylopectin chain. Short amylopectin chain. A special sweet- potato cultivar in Japan named Quick Sweet has starch gelatinization temperature of < 50°C and short cooking time.