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目的：通过检测富血小板纤维蛋白（PRF）中转化生长因子－β1的浓度，了解PRF体外释放效用因子TGF－β1的趋势。方法：兔耳中央动脉抽血，离心3000 r／min×10 min，制取PRF膜，置于5 mL新鲜DMEM溶液中，分别于37℃下静置7 d、14 d、21 d、28 d收集析出液。ELISA法检测其浓度。结果：PRF析出液中TGF－β1质量浓度随着时间的递增而增大，至28 d时达到高峰，TGF－β1质量浓度在21～28 d时呈现一个显著增高的趋势。结论：不同时间对PRF析出液中TGF－β1的质量浓度变化存在一定的影响，随着时间的增加，TGF－β1的浓度逐渐增大。“,”Objective:We detected the concentration of transforming growth factor-β1 in platelet-rich fibrin,to find the tendency that platelet-rich fibrin releasing TGF-β1 in vitro. Method:Blood was taken from central artery of rabbits,to preparation the film of PRF at 3000 r/min for 10 minutes.Add them to five milliliters of fresh DMEM,the time points to col-lect exudates was in day 7,14,21,28 at 37 ℃. And detect the TGF-β1 concentration by ELISA. Result:The mass concen-tration of TGF-β1 in PRF is increases with the increasing of time,at its peak to 28 days,TGF-β1 mass concentration in 21~28 days shows the tendency of a significantly higher. Conclusion:Different time have a certain influence on the mass con-centration of TGF-β1 in PRF exudates changes.With the increase of time, the concentration of TGF-β1 increased gradually.