Objective  To optimize the dry granulation technology of Five-Juice Decoction granules.

Methods  The granule yield was used as the evaluation index to optimize the dry granulation process parameters of Five-Juice Decoction granules by Box-Behnken design-response surface design test. The granule yield, repose angle, dissolve time, humidity absorption rate and particle roundness were used as evaluation indexes, and three batches of validation tests were conducted to compare the difference between the dry granules optimized in this study and the wet extruded granules optimized in previous studies.  

Results  The optimal technological parameters for dry granulation of Five-Juice Decoction granules were as follows: the pressure of the hydraulic system was 3.5 Mpa, the wheel speed was 5.4 r/min, the feeding speed was 7.2 r/min, and the granulation speed was 80 r/min. The technological parameters of wet granulation were as follows: the soft material was made from 90% ethanol, extruded through a 10-mesh sieve for granulation, and dried under reduced pressure at 50 °C to a moisture content of <5%. The granule yield and humidity absorption rate of dry granulation were better than those of wet extruded granules.

Conclusion  Dry granulation process is better than wet extrusion process of Five-Juice Decoction granules. The optimized dry granulation process is stable and feasible, which can provide a reference for industrial production.

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