english version for beerWord文档下载推荐.docx
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ByTedGoldammer
Publisher:
ApexPublishers
December2000
BarleyMalts
(selectedexcerpts)
Barleymaltistobeerasgrapesaretowine.
Itisideallysuitedtobrewingformanyreasons.
Maltedbarleyhasahighcomplementofenzymesforconvertingitsstarchsupplyintosimplesugarsandcontainsprotein,whichisneededforyeastnutrition.
Ofcourse,oneimportantelementisitsflavor.
Therearetwotypesofbarley:
six-rowandtwo-row.
Malting
Maltingservesthepurposeofconvertinginsolublestarchtosolublestarch,reducingcomplexproteins,generatingnutrientsforyeastdevelopment,andthedevelopmentofenzymes.Thethreemainstepsofthemaltingprocessaresteeping,germination,andkilning.
BarleySteeping
Steepingbeginsbymixingthebarleykernelswithwatertoraisethemoisturelevelandactivatethemetabolicprocessesofthedormantkernel.Thewaterisdrained,andthemoistgrainsareturnedseveraltimesduringsteepingtoincreaseoxygenuptakebytherespiringbarley.Generally,thebarleyspendsabout40hoursintanksoffresh,cleanwater,withthreeintervalsduringwhichthewaterisallowedtodrain.Drainingisdonetoremovedissolvedcarbondioxideandtoreintroduceoxygen-richwater.Steepingiscompletewhenthewhitetipsoftherootletsemerge,whichisknownaschitting.Atthispointthegrainswillhaveswollenoneandone-thirdtimestheiroriginalsize.
BarleyGermination
Inthenextstep,thewetbarleyisgerminatedbymaintainingitatasuitabletemperatureandhumidityleveluntiladequatemodificationhasbeenachieved.Germinationisdoneonfloors,indrums,orinboxes.Floormaltingisanoldprocessinwhichthechittedmaltisspreadonthefloortoaheightof10to20cm.Germinationindrumsisstilldone,butisnotveryeconomical;
consequently,onlyafewplantsstillusethissystem.
MaltKilning
Thefinalstepistodrythegreenmaltinthekiln.Maltsarekilnedatdifferenttemperatures.Thetemperatureregimeinthekilndeterminesthecolorofthemaltandtheamountofenzymeswhichsurviveforuseinthemashingprocess.Lowtemperaturekilningismoreappropriateformaltswhenitisessentialtopreserveenzymatic(diastatic)power.Thesemaltsarehighinextractbutlowincoloringandflavoringcompounds.Pilsnerandpalealemaltsareexamplesofmaltskilnedatlowtemperatures.Maltskilnedatintermediatetemperatures,suchasMunichandViennamalts,arelowerinenzymesbuthigherincoloringandflavoringcompounds.Maltskilnedathightemperatures,suchascrystalandchocolatemalts,havelittleifanyenzymes,thusarelowerinextract.
MaltConstituents
Maltislargelymadeupofcarbohydrates,whicharecomposedofinsolublecellulose,solublehemicellulose,dextrins,starch,andsugars.Celluloseconstituentsdonotcontributetofermentableextractordesirableflavorsinthemalt.Hemicelluloseisaconstituentoftheendospermcellwalls,whichconsistlargelyofbeta-glucan.Dextrinsareresidual,unfermentablefractionsofamylopectin.Starch,accountingforabout60to65%ofthemalt’sweight,iscomposedofamylose,whichisreducedtomaltoseandmaltotrioseandamylopectinsthatdecomposeintoglucose.Glucose,amonosaccharide,accountsforabout1to2%ofthetotalstarchfoundinabarleykernel.Maltose,adisaccharideordouble-sugar,ismostcloselyassociatedwithbrewingandisformedbytwomoleculesofglucose.Anotherdisaccharidepresentinmaltissucrose.Theonlysignificanttrisaccharideortriple-moleculesugarinbrewingismaltotriose.Maltotrioseisslowlyfermentablebymoststrainsofbrewingyeast.
MaltExtracts
Maltextractscanbeusedasasolesourceoffermentablesugar,ortheycanbecombinedwithbarleymalt.Themaltextractcomesintheformofsyrupordriedpowder.Ifthefinalproductisadriedpowder,themaltextracthasundergoneacompleteevaporationprocessbymeansof"
spray-drying,"
thusremovingalmostallofthewater.Forsimplicity,usean85%conversionfactorwhensubstitutingdriedmaltforsyrup.Syrupsaremorepopularthandriedmaltextract,possiblybecausetheyarelesstroubletostore.Acommonproblemnoticedinmaltextractbeersisthethin,drypalate,whichcorrelateswithalowterminalgravity.Anothercommonproblemisthelackofatrue"
darkmalt"
flavorindarkbeers.
Hops
Hops,aminoringredientinbeer,areusedfortheirbittering,flavoring,andaroma-enhancingpowers.HopsalsohavepronouncedbacteriostaticactivitythatinhibitsthegrowthofGram-positivebacteriainthefinishedbeerand,wheninhighenoughconcentrations,aidsinprecipitationofproteins.
HopConstituents
Hopscontainhundredsofcomponents,butofparticularinterestareresins,oils,andpolyphenols.
HopResin
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