英文摘要
mediaand/oremployedaglucosestarvationandthustheeffectsofacetateatdifferentcell
ongrowthphaseweredetermined.Experimentalresultsshowthatobviousacetateinhibition
cellgrowthoccurredinthephasesofbatchculturewhileitsinhibitoryeffectonHLCexpressionoccurredonlyintheexpressionphase.
Thedevelopmentofasuitableinoculumisimportanttothefermentationprocess.Tooptimizetheinoculumpreparationprocess,thethirdinoculumtransferstageandmediumweredetermined.The
WasresultsshowedthatHLCproductivityWashighestwhentheⅡlirdatlatelyexponentiMinoculumtransferredstage;inaddition,whentheglucose
concentrationWas20g/L,thefollowingfermentationtimeWasshortestandthefinalHLCconcentration
0.518washighest,andthustheHLCaverageproductivitywashighest(achievedg/L/h).
aAcetatehad
SOastrongnegativeinfluenceontheHLCproductionaccordingtothiswork,tocontrolfeed-back
acetatecontrolledmethodthattheprobingfeedingstrategyWasdevelopedWastheproduction.Themethod
onemployedtomaintaindissolvedoxygenconcentrationatthesamelevel
finalbothlaboratoryscaleandpilotscalefermentations.TheonDCWof69.1g/LandHLCconcentrationof13.1g/Lwereobtained
resultsarethelaboratoryfinalscale.andthe
51.7g/Lsimilartothatoptimizedinthepreviousof9.6g/Lwereobtainedstudy.TheonDCWofandHLCconcentrationthepilot-scaleuponoptimizationofinductiontiming.
ThereasonforthedecreaseintheHLCproductiononthepilotscalemaybethelower
volumetricmasstransferoxygentransferrateforthepilot scale
coefficientkLa
kLaonfermentor.Therefore,thedifferentscalefermentorswasdeterminedandthecorrelationsbetweentherateandoperationparameters(aeration,stirrer
oxygentransferandinitialmediumvolume)werecouldbedeveloped.Andthusthecapacitiesfordifferentfermentors
compared.ThecorrelationsforkLaonthelab-scalefermentoriS,
(kLa)L=0.OlllQ0.3185N1’5”1VLn4舳3
AndthecorrelationsforkLaonthepilot-scalefermentoris,(kLa)P=0.2690Q0.29S3N他727VLm404
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