OBJECTIVE: To compare dispersibility between two kinds of plasdone used as the hydrophilic adhesive in nimesulide dispersible tablets.METHODS: Nimesulide dispersible tablets were prepared with Plasdone S630 and Plasdone K30 as the hydrophilic adhesive respectively which were dissolved in 5% alcohol solution or 5% water solution.By friability,hardness and dispersibility tests,the influence of S630 and K30 in quality of nimesulide dispersible tablets were observed.RESULTS: Plasdone S630 alcohol solution or aqueous solution showed same or better results in friability,hardness and dispersibility compared with Plasdone K30 alcohol solution or aqueous solution.CONCLUSION: Plasdone S630 could be used as a alternate of K30 for hydrophilic adhesive in dispersible tablets.

Objective To explore the quality control results of Digital Diagnost digital radiography (DR), and also to analyze the differences in signal transfer characteristics (STP) of DR from different manufacturers, in order to provide a reference for quality control of testers and daily supervision of administrative staff. Methods According to WS 76—2020 “Specification for testing of quality control in medical X-ray diagnostic equipment”, the test items such as automatic exposure control (AEC) repeatability, AEC response, detector dose indication (DDI), STP, high-contrast resolution, and low-contrast resolution of Digital Diagnost DR were qualitatively controlled, and several common DRs on the market were selected to analyze their STP functional relationships. Results The baseline values of DDI, high-contrast resolution, and low-contrast resolution of Digital Diagnost DR were 19733, 2.8 Lp/mm, and H5 of image central pixel value, respectively; the quality control results of other test items met the requirements of WS 76—2020. The STP functional relationships of common DRs were mainly linear and logarithmic, but different models of DR from the same manufacturer might also have different STP functional relationships. Conclusion When testing some special test items of DR, attention should be paid to the influence of a variety of factors, while refining the test steps and condition settings for the test items. The simulation should be performed in accordance with the functional relationship provided by the manufacturer when analyzing the STP.