RESUMEN
Qualitative and quantitative methods were used to establish the quality of different medicinal parts of Poria cocos (Poriae Cutis, rubra Poria, white Poria, Poria cum Radix Pini) by using ultra-performance convergence chromatography coupled with photo-diode array and quadrupole time-of-flight mass spectrometry (UPC2-PDA-Q-TOF/MSE). A total of 18 chromatographic peaks were detected from Poria cocos by UPC2-PDA. Principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA) were used to compare the four medicinal parts. The results showed that there were significant differences in the components of different medicinal parts, and the main triterpenoic acids were poricoic acid A, poricoic acid B, dehydroeburicoic acid, and dehydrotrametenolic acid. When combined with the common active component polyporenic acid C, a method for determination of five triterpenoic acids in different parts of Poria cocos was established. These components could be separated within 15 min, and the amount of methanol was 3.63% of that of HPLC method. Taking the five triterpenoid acids as an index, the content of triterpenoid acids in different parts of Poria cocos from high to low were Poriae Cutis, rubra Poria, white Poria and Poria cum Radix Pini. The method is simple, rapid, and uses minimal solvent. The mobile phase of environment-friendly gas carbon dioxide has unique advantages in reducing environmental pollution, which can provide a basis for the development and standard formulation of Poria cocos and its related products.
RESUMEN
In vitro release is an important index to evaluate the quality of nano preparation, but there is no pharmacopoeia standard of in vitro release evaluation METHODS of nano preparation exists at present, it seriously restricts the safety improvement of nano preparation and the progress of its product development. The main in vitro release evaluation METHODS of nano preparation at present are sample and separate method, flow through cell method, dialysis method, franz diffusion cell method, combination METHODS, and the new METHODS of electrochemical method, nonelectrochemical method and microdialysis method. With the aim to optimize the improvement and development of in vitro release evaluation METHODS of nano preparation, this paper combined with the special properties of nano preparation and provided mainly the research status of in vitro release evaluation METHODS of nano preparation in recent years and their strengths and shortcomings.