乳糖研磨改性降低红景天提取物吸湿性的工艺与原理研究

该文以强吸湿性的红景天提取物为研究对象，以乳糖为改性剂，考察研磨改性法对红景天提取物吸湿性的影响，并通过粒径分布、微观结构、红外光谱、表面性质等方面对改性物予以表征。结果表明，红景天提取物与乳糖UP2等比例研磨5 min制备的改性物的吸湿初速度、吸湿加速度及临界相对湿度均显著低于原提取物及物理混合物；研磨改性物的粒径小于物理混合物，微观结构也明显不同于物理混合物，其红外光谱及表面性质亦与乳糖UP2更为类似。研磨改性使得乳糖粒子附着于红景天提取物表面是吸湿性显著降低的重要原因。

Study on process and principle of lactose grinding modification to decrease hygroscopic of Rhodiolae Crenulatae Radix et Rhizoma extract

In this paper, Rhodiolae Crenulatae Radix et Rhizoma extract,with high hygroscopic,was selected as research model,while lactose was selected as modifiers to study the effect of the grinding modification method on the hygroscopic. Subsequently, particle size distribution, scannin electron microscopy, infrared spectroscopy and surface properties were adopted for a phase analysis.The results showed that the modified extract, prepared by Rhodiolae Crenulatae Radix et Rhizoma extract grinding 5 min with the same amount of lactose UP2, which hygroscopic initial velocity, acceleration, and critical relative humidity moisture were less than that of Rhodiolae Crenulatae Radix et Rhizoma extract and the mixture dramatically.In addition, compared with the mixture, the size distribution of modified extract was much less, the microstructure was also difference, while the infrared spectroscopy and surface properties were similar with that of lactose. It is the main principle that lactose particle adhered to the surface of Rhodiolae Crenulatae Radix et Rhizoma extract after grinding mofication to decress the moisture obviously.