不同粒径金花茶茶花粉体物理特性

研究3种不同粒径范围金花茶茶花粉体的流动性、溶解性、功能成分皂苷溶出量等物理特性,并结合激光粒度分布仪和扫描电子显微镜进行直观分析。结果表明:普通粉(平均直径133.90μm)、超微粉(平均直径15.76μm)、纳米粉(平均直径201.50 nm)的粒径依次减小,细胞破碎程度、不规则度依次增加,差异显著;随粒径减小,粉体的流动性、松密度、润湿性、膨胀力先减小后增加,以普通粉最高;持水力普通粉最高,超微粉次之;水溶性、皂苷溶出量呈现先增大后略微减小的趋势。说明不同粒径金花茶茶花粉体特性各不相同,综合比较下,超微粉具有较高的溶解率、皂苷溶出量,更容易被人体吸收,生物利用度高,加工方便,具有较好的开发前景。

Physical Characteristics of Camellia chrysantha (Hu) Tuyama Flower Powder with Different Particle Sizes

The flowability, solubility, saponin dissolution rate and other physical properties of Camellia chrysantha (Hu) Tuyama flower powder in 3 different particle size ranges were determined, and the particle size and microstructure were measured with a particle size analyzer and a scanning electron microscope. The results showed that the particle size of ordinary, submicron and nanometer powder decreased sequentially with mean diameter of 133.90, 15.76 μm and 201.50 nm, respectively, and consequently the degree of cell disruption and the degree of irregularity increased with significant differences being observed among the three powders. Flowability, bulk density, wettability and expansibility decreased first and then increased with the decrease of particle size and the highest values of these parameters were recorded for the ordinary powder. The ordinary powder also had the highest water-holding capacity, followed by the submicron powder. Water solubility and saponin dissolution rate initially increased followed by a slight decrease. These findings suggested that the physical characteristics of Camellia chrysantha (Hu) Tuyama powder with different particle sizes were diverse. Overall, the submicron powder had high water solubility and saponin dissolution rate, and could be readily absorbed with high bioavailability in the body and conveniently processed, presenting good application prospects.