The objective of this study was to prepare a biodegradable poly (DL-lactide) injectable gel of tinidazole. The formulation parameters evaluated in this study included polymer molecular weight, polymer concentration, solvent and drug loading, and orthogonal design was used to optimize the formulation. The preferable formulation was that 30% (w/w) poly(DL-lactide) (MW is 5 700) dissolved in 70% (w/w) N-methyl-2-pyrrolidone with 4%-6% (w/w) tinidazole.
Delayed-Action Preparations ; Drug Carriers ; chemistry ; Gels ; Lactic Acid ; chemistry ; Polyesters ; Polymers ; chemistry ; Technology, Pharmaceutical ; methods ; Tinidazole ; administration & dosage

Objective: To investigate the drug resistance and positive virulence genes of Acinetobacter baumannii (A.baumannii) and analyze the correlation between drug resistance and the positive pattern of virulence genes. Methods: A total of 67 strains of A.baumannii were collected and identified by matrix assisted laser desorption ionization time of flight mass spectrometry technology (MALDI-TOF MS). Drug susceptibility tests were carried out by turbidimetric and redox indicator method. The homology of A.baumannii stains was explored by cluster analysis. The 8 virulence genes including bacterial outer membrane protein (ompA), biofilm formation (adeH, csuA, pgaA), iron uptake system (basJ), phospholipase D (plcD), capsular positive phenotype (ptk) and regulation of quorum sensing system (abaI) were amplified by PCR and sequenced. The correlation between virulence genes and drug resistance in the 67 strains of A. baumannii was investigated. Results: The positive rates of virulence genes ompA, adeH, csuA, pgaA, abaI, basJ, ptk and plcD were 94%, 100%, 94%, 99%, 93%, 96%, 82% and 99%, respectively. Among the 67 strains of A. baumannii, 3 genes were simultaneously detectable in 1 strain (1.5%), 5 genes were positive in 2 strains (3.0%), 6 genes were positive in 2 strains (3.0%), 7 genes were positive in 14 strains (20.9%) and all the 8 genes were positive in 48 strains (71.6%). Among the 48 strains with 8 positive virulence genes, the drug resistance rate of polymyxin was only 2.1%, but tetracycline was 58.2%, piperacillin and other 13 antibiotics was more than 80%. The 14 strains with 7 positive virulence genes showed more than 78% of resistance rate for all the tested antibiotics except for tetracycline and polymyxin. Cluster analysis showed that the 67 strains of A. baumannii were divided into 2 genotypes: A (41 strains) and B (26 strains). The 41 strains of A type were divided into A1 (27 strains) and A2 (14 strains) subtypes. The strains of A1 subtype were mainly from neurosurgery department (7 strains), ICU (5 strains) and pneumology department (3 strains). The strains of A2 subtype were mainly from pneumology department (3 strains), cardiothoracic surgery department (3 strains), ICU (2 strains) and neurosurgery department (2 strains). The 26 strains of B type were divided into B1 (19 strains) and B2 (7 strains). The strains of B1 type were mainly from ICU (7 strains), neurosurgery department (4 strains) and respiratory department (3 strains). The strains of B2 type were mainly from ICU (2 strains) and respiratory department (3 strains). Conclusion The cross infection from A. baumannii may present in our hospital. There was no correlation between drug resistance and positive pattern of virulence gene in Acinetobacter baumannii.

Objective Feixian Fang is a Chinese medicine compound,formulated by the principle of in-vigorating lung and kidney,reducing phlegm and resolving masses,and promoting blood circulation to re-move meridian obstruction.This paper aimed to investigate the effect of Feixian Fang extract (FXF)on degree of pulmonary fibrosis,change of microvessels and platelet endothelial cell adhesion molecules (CD 31,CD34)in rats with pulmonary interstitial fibrosis.Methods All rats were divided into sham opera-tion group,model group,prednisone group,losartan group,FXF high-,mid-and low-dose group.Ex-cept the sham operation group,the rats of other six groups were instilled bleomycin of 3 mg/kg through tracheal intubation.The next day,the rats were administered intragastrically corresponding medicines for consecutive 14 d or 28 d.The degree of pulmonary fibrosis,change of microvessels were observed under electron microscope and the expression of CD31 and CD34 were detected using immuhistochemistrical methods.Results High dose and middle dose FXF inhibited the pulmonary fibrosis and pulmonary alve-olar inflammation and decreased microvascular density (P <0.05).Conclusion The effect of FXF a-gainst pulmonary interstitial fibrosis can be via the way of decreasing microvascular density to induce less abnormal angiogenesis in pulmonary fibrosis.