简介：NocathiacinI,aglycosylatedthiopeptideantibiotic,displaysexcellentantibacterialactivitiesagainstmultidrugresistantbacterialpathogens.Previously,anovelnocathiacinIformulationforintravenousadministrationhasbeensuccessfullydevelopedanditsaqueoussolubilityisgreatlyenhancedforclinicalapplication.ThepurposeofthepresentstudywastoincreasethefermentationtiterofnocathiacinIandreduceoreliminateanalogousimpuritiesbyscreeningthemediumingredientsusingresponsesurfacemethodology.Afterasysmaticoptimization,awater-solublemediumcontainingquality-controllablecomponentswasdevelopedandvalidated,resultinginanincreaseintheproductionofnocathiacinIfrom150to405.8mg·L-1at150-Lscale.Meanwhile,theanalogousimpuritiesexistedinreportedprocessesweregreatlyreducedoreliminated.Usingoptimizedmediumforfermentation,nocathiacinIwithpharmaceuticallyacceptablequalitywaseasilyobtainedwitharecoveryof67%.Inconclusion,theresultsfromthepresentstudyofferapracticalandefficientfermentationprocessfortheproductionofnocathiacinIasatherapeuticagent.

简介：目的：利用数量化理论方法筛选影响冬凌草Pb含量的关键因子，为冬凌草Pb污染水平预测及调控提供依据。方法：冬凌草Ph质量分数采用等离子发射光谱法测定，生态环境因子为样地调查实测和收集产地环境监测资料相结合，采用数量化方法I拟合曲线分析。结果：经多因子筛选，确定影响冬凌草铅含量（Y）的贡献值最大的关键因子分别为：土壤Pb含量（X1），降水pH值（X6），污染源（X3），公路距离（X4）。结论：建立的冬凌草铅含量预测模型，可为冬凌草药源铅污染程度科学评估和有效防控提供依据。