负载EGCG和葡聚糖水解酶的纳米囊泡构建及其对变形链球菌抗菌作用的实验研究

An experimental study of construction of EGCG and dextranase loaded nanovesicles and its antibacterial effects on Streptococcus mutans

目的:探究负载表没食子儿茶素没食子酸酯(epigallocatechin gallate,EGCG)和葡聚糖水解酶的纳米囊泡对变形链球菌(Streptococcus mutans, S.mutans)的抗菌作用。方法:制备负载EGCG和葡聚糖水解酶的纳米囊泡,并利用透射电子显微镜(transmission electron microscope,TEM)对其进行表征,通过紫外吸光度法测定其载药率,通过抑菌及抗菌实验检测其对S.mutans的抗菌效果。结果:负载EGCG和葡聚糖水解酶的纳米囊泡在TEM下为均匀球体,粒径约为100 nm,体外稳定性良好,载药率达74.06%;最小抑菌浓度(minimum inhibitory concentration,MIC)为24μg/mL,最小杀菌浓度(minimum bactericidal concentration,MBC)为32μg/mL,显示出抗S.mutans的特性。结论:本实验成功构建了目标纳米囊泡,且其对S.mutans具有抗菌效果。

Objective:To explore the antibacterial effects of a nanovesicle carrier loaded with epigallocatechin gallate(EGCG)and dextranase on Streptococcus mutans(S.mutans).Methods:The nanovesicles loaded with EGCG and dextranase were fabricated and characterized by transmission electron microscopy(TEM).Drug loading rate was determined by ultraviolet spectrophotometry.Antibacterial properties of nanovesicles against S.mutans were evaluated by antibacterial and bacteriostatic tests.Results:The nanovesicles were successfully constructed,which appeared as uniform spheres under TEM.The particle size was nearly 100 nm,the stability in vitro was fair,and the drug loading rate was 74.06%.The minimum inhibitory concentration(MIC)and the minimum bactericidal concentration(MBC)of the synthesized nanovesicles was 24μg/mL and 32μg/mL respectively,showing its antibacterial effect on S.mutans.Conclusion:The nanovesicles were successfully constructed and had antibacterial effect on S.mutans.