目的 针对发酵虫草菌粉流动性差、易受潮的问题，引入粒度级配方法，探讨流动性参数与粒度分布之间的关系，为提升粉体性能、优化工艺处理策略提供依据。方法 采用激光粒度仪、粉体特性测试仪和粉体流变仪，对发酵虫草菌粉的粒度分布、静态流动性（休止角、豪森纳比、平板角等）和流变性质（流动能性质、充气性质、透气性质和剪切性质）进行系统表征，分析不同粒度配比对粉体填充行为和吸湿性能的影响。结果 粒径是影响发酵虫草菌粉流动性的关键因素，粒度级配为24-80（95∶5）目的混合粉末填充性最优。吸湿动力学研究表明，双指数模型和威布尔模型均能较好地拟合不同粒径发酵虫草菌粉的吸湿行为，为其吸湿性提供量化指标。结论 粒度级配设计为提升发酵虫草菌粉的流动性和稳定性提供新思路。

Objective To address the issues of poor flowability and high hygroscopicity of fermented Cordyceps powder, the particle size gradation strategy and investigates the relationship between flowability parameters, particle size, and particle size distribution, so as to provide theoretical support and technical guidance for enhancing powder performance and optimizing processing strategies. Methods A laser particle size analyzer, powder characteristics tester, and powder rheometer were employed to systematically characterize the particle size distribution, static flowability parameters (angle of repose, Hausner ratio, and flat plate angle, etc.), and rheological properties (flow energy, aeration, permeability, and shear behavior) of the fermented Cordyceps powder. The effects of different particle size ratios on powder packing behavior and hygroscopicity were analyzed. Results Particle size is a critical factor affecting powder flowability. A particle size ratio of 24-80 (95:5) mesh yielded optimal packing performance. Hygroscopic kinetics modeling showed that both the double exponential and Weibull models provided good fits for describing the moisture absorption behavior of powders with different particle sizes, offering quantitative indicators of hygroscopicity. Conclusion Particle size gradation design provides a new strategy for improving the flowability and stability of fermented Cordyceps powder.

R283.7

国家重点研发计划项目资助(2023YFC3504504)