Cov khoom

Lub hom phiaj ntawm txoj kev tshawb no yog qhov kev tshuaj ntsuam caj ces thiab kev ntsuam xyuas kev nyab xeeb ntawm 129 Enterococcus cais tau los ntawm cov cawv uas tau ua rau malolactic fermentation.Genetic characterization los ntawm randomly amplified polymorphic DNA-PCR tso tawm 23 genotypes.25 tus neeg sawv cev cais tawm ntawm txhua tus genotypes tau txheeb xyuas tias yog Enterococcus faecium los ntawm hom tshwj xeeb PCR thiab tshuaj xyuas rau cov tshuaj tiv thaiv kab mob, muaj cov kab mob virulence thiab muaj peev xwm aminobiogenic, ob qho tib si hauv decarboxylase nruab nrab thiab cawv.Lub peev xwm aminobiogenic hauv cawv tau txheeb xyuas nyob rau hauv muaj (assay 1) thiab tsis tuaj (assay 2) ntawm Oenococcus oeni CECT 7621. Resistance to tetracycline, cotrimoxazol, vancomycin thiab teicoplanin tau nthuav tawm los ntawm 96% ntawm cov kab mob, tab sis tsis muaj leej twg tau muab pov tseg. virulence noob.Tag nrho cov kab mob harbored tyrosine decarboxylase (tdc) noob, thaum 44% tau zoo rau tyramine hauv decarboxylase nruab nrab.Tsuas yog tsib tawm ntawm 25 hom muaj sia nyob hauv cawv tom qab xya hnub ntawm kev tsim, thiab thaum muaj kev cuam tshuam ntawm biogenic amines hauv cawv tau txiav txim siab los ntawm HPLC, tsuas yog cov cawv txiv hmab uas tsib txoj sia nyob tau tshwm sim muaj cov tshuaj biogenic amines.Histamine, putrescine thiab cadaverine tau kuaj pom nyob rau hauv cawv los ntawm ob qhov kev soj ntsuam, txawm hais tias muaj ntau dua hauv kev xeem 2. Tyramine thiab phenylethylamine tau kuaj pom tsuas yog thaum tsis muaj O. oeni.Qhov kev tshawb fawb no pab txhawb rau kev paub txog kev nyab xeeb ntawm enterococci ntsig txog winemaking.