Research on the Effect of Hot-Air Drying on Dyed Bean Dregs

Abstract:

In the study, the monascus red pigment LA, monascus red pigment LND, beta-carotene, caramel pigment and mixed pigments were used to dye and dry the bean dregs. It was studied that the change of water content and color of the bean dregs during the hot-air drying. The stability of the dry dyed bean dregs was investigated under different storage conditions, and the effect of bean dregs composition on dyeing of bean dregs was researched. The results showed that the color of the dyed bean dregs which was dried at (90±5)℃ for 60 min was steady. The water content fell to 5% after 90 min. The optimum storage was refrigeration, light-resistant and oxygen-free. Secondly, it was store without light and oxygen at room temperature. The worst condition was store with light and oxygen at room temperature.