Preparation of ligustrazine microemulsion and comparative study on in vitro release of different size microemulsions / 中草药

Objective: To study the preparation process of ligustrazine microemulsion delivery system and evaluate its physical pharmacy properties; Microemulsions of different particle sizes were prepared in different oil phases, and the effect of particle size factors on the release behavior of the preparation was investigated. Methods: Taking the solubility of ligustrazine as index, the oil phase, emulsifier, and co-emulsifier were screened. The microemulsion formulation was optimized by pseudo-ternary phase diagram method. The encapsulation efficiency and drug loading was studied by ultrafiltration centrifugation. The particle size and potential were detected by the particle size analyzer. The release behavior of microemulsions with different particle sizes was compared by dialysis bag method. Results: The tetramethylpyrazine microemulsion was successfully prepared, and the appearance was clear and transparent. The average pH value was about 5.46. The detection method of microemulsion encapsulation rate was successfully established. When the drug loading of ligustrazine was 1.2 mg/mL, the encapsulation efficiency was (87.43 ± 0.20)%. The microemulsions of different particle sizes were prepared by changing the oil phase (ethyl oleate, oleic acid, and IPM). When the drug loading was 1.2 mg/mL, the three particle sizes were (16.80 ± 0.91), (129.50 ± 1.21), and (18.51 ± 0.24) nm, respectively. The release test showed that the release rate of all three could reach more than 90% within 4 h, and there was no significant difference. Conclusion: The uniform and stable tetramethylpyrazine microemulsion is successfully prepared; The release behavior of different tetramethylpyrazine microemulsions is not affected by the particle size factor.

Proposing “nano-based physical pharmacy” principle for overcoming bottlenecks in development of nanomedicine / 第二军医大学学报

Nanomedicine has shown huge potential in the treatment of cancer, which is not only due to the fact that it can overcome the drawbacks of some small molecular drugs such as insolubility, rapid metabolism, and bad targeting, but also realize the multi modality treatment by containing A minor of nanomedicine can be approved for clinical applications due to poor stability and rapid metabolism, resulting in the limited efficacy and bottlenecking the development of Nanomedicine, that is, “excellent performance in vitro -poor performance in vivo ”. We believe that the fundamental solution in nanomedicine depends on its basic physical and chemical properties, that is the research and innovation of physical pharmacy theoretical methods of nanopreparation. Herein, Focusing on the statistics of tumor microenvironment and targeting the practical clinical The rats were treated with aerobic chemotherapeutic drugs as an example, we systemically elaborated The relationship of the physicochemical properties including the carrier composition, self-assembly, drug loading and release, and stability with in vitro and in vivo properties, and explored the related mechanism in vivo.

Exploration and practice of the rational design of physical pharmacy teaching contents / 中华医学教育探索杂志

The rational design of teaching contents of physical pharmacy plays an important role in the class teaching.Some practices of designing teaching contents are expounded in detail,including the combination with teaching cases,the integration of the teaching contents,the combination with the research results of the physical pharmacy,and the combination with the pharmaceutical experiments of traditional Chinese medicine.The innovation of this research is the combination of theory and practice and the infiltration between teaching and scientific research.It also puts forward some measures such as continually accumulating and improving the related material,and constructing a rich,shared source material storehouse,etc..