ABSTRACT
In recent years, driven by high-throughput sequencing technology, it has been found that changes in the proportion of specific microbiota are related to the occurrence and development of pancreatic cancer, including oral microbes, gastrointestinal flora, and pancreatic flora. Porphyromonas has a positive correlation with pancreatic cancer risk, which may provide new biomarkers for the diagnosis of pancreatic cancer. In addition, the microbiota is closely related to various treatments for pancreatic cancer. When the intestinal flora is imbalanced, it will affect the effect of chemotherapy. Bacteria in pancreatic cancer can induce immune tolerance. Complications with bacterial infection can lead to postoperative complications increase.
ABSTRACT
Objective:o prepare Danshensu liposomes and investigate drug release characteristics in vitro. Methods: Danshensu liposomes were prepared by a reverse-phase evaporation method. The encapsulation efficiency was used as the index, an orthogonal test was adopted to investigate the effect of concentration of soybean lecithin, ratio of lipid-Danshensu and pH value of solution on the preparation procedure of Danshensu liposomes. The particle size of the liposomes was also investigated by a transmission electron micro-scope ( TEM) . The concentration of Danshensu was determined by HPLC, and the difference of release characteristics in Danshensu li-posomes and Danshensu solution was measured by a dialysis method. Results:The optimum preparation technology was as follows:the concentration of soybean lecithin was 40 mg·ml-1 ,the ratio of drug-lipid was 1: 10,and the pH value of solution was 6. 6. The mor-phology of the prepared liposomes showed spheric structure with uniform diameter, and the average particle size was ( 174 ± 36 ) nm and the encapsulation efficiency was 38. 9%. The linear range of Danshensu was 2. 0-20. 0 mg·L-1(r=0. 9984). The drug release of liposomes in vitro was slower than that of free Danshensu solution in 24 h. Conclusion:Danshensu liposomes with fine morphology have sustained release property.