Abstract:Instant Colla corii Asini powder was prepared using Colla corii Asini（soybean oil free） as the main ingredient and inulin，erythritol，resistant dextrin，and concentrated jujube juice as the auxiliary ingredients.Single-factor and response surface experiments were used to optimize the spray-drying conditions for instant Colla corii Asini powder preparation.Furthermore，sensory evaluation and solubility analysis comparisons were performed with commercial Colla corii Asini powder，and the microstructures of the preparations were compared by scanning electron microscopy.The results showed that the optimum spray-drying conditions were an inlet air flow of 37.11 m3/h，an inlet temperature of 149 ℃，a feed flow of 45.34 mL/min，and soluble solids content 22.21%.Under this condition，and the powder yield was up to 92.31%.Compared with commercial products，the prepared powder was relatively smooth in appearance and hollow in the interior.Due to its special structure，the dissolution time for the prepared instant Colla corii Asini powder was 32.7 s，which was much shorter than the dissolution time of the commercial Colla corii Asini powder （61.27 s）.The sensory evaluation showed that the prepared instant Colla corii Asini powder under the optimum conditions was light red with fine particles.The solution was transparent，without an oily film，after dissolving.It had an aroma of red dates，and had no burnt，fishy，bitter，irritating，or other odors.