Effect of addition of carrot fiber on properties of litchi juice powder with spray drying

The feasibility of addition of carrot fiber as a carrier on properties of litchi juice powder with spray drying was studied. The effects of processing parameters such as the ratio of carriers,feeding concentration,flow rate, inlet air temperature on physical properties( e. g., moisture content, density, hygroscopicity and dissolution) of the powders were examined. Based on the results obtained from single factor experiments,an orthogonal experiment was designed to optimize the processing conditions of spray drying of litchi powder.The optimal spray drying processing conditions was shown as follows:homogenization pressure of 20 MPa with15 min,carrot fiber of 15% and maltodextrin of 22.5% was used as drying carrier,feeding concentration 25%,flow rate of 25 m L/min,feeding temperature of 50 ℃,inlet air temperature of 175 ℃. Under these conditions,the response values were moisture content of 3.24%,density of 0.512 g/m L,hygroscopicity of 0.038 %,flowability of53.6°,dissolution of 94 s,respectively.