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. 2021 Jan 19;11:612478. doi: 10.3389/fphar.2020.612478

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Copyright © 2021 Dong, Qin, Ma, Cui, Chen, Hou, Chen, God’spower, Eliphaz, Qin, Guo, Ding and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Evaluation of different characteristics of PSP. (A) The particle of different PSPs was determined by laser diffraction instrument. α-ε represents the particle size distributions of five different kinds of PSPs, respectively. (B) Different sized PSP powders were observed by 2,000× SEM. The particle size of PSP was gradually decreased from α to ε. (C,D) The angle of repose and tap density of different particles of PSP were determined. (E,F) The content of luteolin and scutellarein. (G) The PSP with different particles was determined through Fourier infrared spectroscopy. The numbers in the picture represent the peak absorption of each functional group in the PSP. All data are presented as means ± SD from five groups. Different small letter superscripts (a–e) in the same column indicate significant differences at p < 0.05.