Thin-layer drying of marigold flowers and flower components for petal removal

Thin-layer drying characteristics of marigolds were determined as a functio n of air temperature and airflow rate. Optimum drying conditions for petal separation were identified and xanthophyll reduction was associated with th ese conditions. A thin-layer model was developed to describe the drying cha racteristics of marigolds. Optimum conditions for petal detachment with thi n-layer drying were found at an air temperature of 70 degrees C and an airf low rate of 0.33 m(3).s(-1).m(-2). On the average, xanthophyll content decr eased at higher drying temperatures.