简介：目的：探究人参内生细菌gel5菌株对人参病原菌的作用机理，明确ge15菌株胞外分泌液中抑菌活性成分的提取方法、活性组分及抑菌活性物质的稳定性。方法：通过硫酸铵沉淀、浓盐酸沉淀及饱及正丁醇萃取等方法获得菌株发酵液中抑菌活性成分；牛津杯法测定提取成分的抑菌活性。结果：从ge15菌株发酵液得到的提取液均有抑菌活性；对发酵上清液经高温和蛋白酶K处理，抑菌活性未见明显变化。结论：ge15菌株能产生多种抑菌活性成分；抑菌成分对高温和蛋白酶K稳定。

简介：Ginkgolicacids(GAs),primarilyfoundintheleaves,nuts,andtestaofginkgobiloba,havebeenidentifiedwithsuspectedallergenic,genotoxicandcytotoxicproperties.However,littleinformationisavailableaboutGAstoxicityinkidneysandtheunderlyingmechanismhasnotbeenthoroughlyelucidatedsofar.InsteadofGAsextract,therenalcytotoxicityofGA(15:1),whichwasisolatedfromthetestaofGinkgobiloba,wasassessedinvitrobyusingMDCKcells.TheactionofGA(15:1)oncellviabilitywasevaluatedbytheMTTandneutralreduptakeassays.Comparedwiththecontrol,thecytotoxicityofGA(15:1)onMDCKcellsdisplayedatime-anddose-dependentmanner,suggestingthecellsmitochondriaandlysosomesweredamaged.ItwasconfirmedthatGA(15:1)resultedinthelossofcellsmitochondrialtrans-membranepotential(ΔΨm).Inpropidiumiodide(PI)staininganalysis,GA(15:1)inducedcellcyclearrestattheG0/G1andG2/Mphases,influencingontheDNAsynthesisandcellmitosis.CharacteristicsofnecroticcelldeathwereobservedinMDCKcellsattheexperimentalconditions,asaresultofDNAagarosegelelectrophoresisandmorphologicalobservationofMDCKcells.Inconclusion,thesefindingsmightprovideusefulinformationforabetterunderstandingoftheGA(15:1)inducedrenaltoxicity.