资源描述：
《油脂酸败理论（）》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、油脂酸败理论()Becausethefatunsaturatedcomponentsbyoxygen,waterorairinthemoldtheeffectofautooxidation,peroxidegenerationfurtherdegradationofcomplexmixturesofvolatilealdehydes,ketones,carboxylicacids,andsmel1.Thedoublebondsofunsaturatedfattyacidsinfatsareoxidizedbyoxy
2、genintheairtoproduceacomplexmixtureofaldehydesandacidswithsmallermolecularweights,whilelightandheatacceleratetheoxidationprocess・Fatcanhydrolyzeundertheconditionofhightemperature,highhumidityandpoorventilation,andproducefattyacidandglycero1.Thefattyacidcanbefu
3、rtherproducedbymicroorganismtoproduceketone・RancidityclassificationhydrolyticrancidityUnderproperconditions,thereactionbetweenoilandwatertoproduceglycerolandfattyacidsiscalledhydrolysisreaction.Thereactionisreversible,whichishydrolyzedintoglyceroltwoacylester,
4、andthenhydrolyzedintoglycerolester,andfinallyhydrolyzedtoglyceroLHydrolysisitselfhasnosignificanteffectonthenutritionalvalueoffoodfat・Oxidativerancidity(autooxidationgrease)Thethinlayeroffishoilisplacedintheairanditsqualityismeasured・Itcanbefoundthatthechangeo
5、foilqualitycanbedividedinto3stages・Thefirststageoxygenqualitychangeisverysmall,littleknownastheinductionperiod(initiationperiod);thesecondstageabsorptionofoxygen,significantqualitydeterioration,calledtheproliferationstage(propagationperiod);thethirdstageoxygen
6、tendstosloworevenstop,calledtermination・Rancidity1.moisturegreaseisahydrophobicsubstancewithlittlewatercontent・ThereislittlewatercontentintheoilobtainedfromHowever,underthecurrentproductionandfatindustry,thewatercontentofoilmuchbecauseofthelargemoisturecontent
7、imperfectequipmentorpooroperationdryoilpressing・conditionsofoilproductionistooofrawmaterials,technology.Inaddition,theoilistransportedandstoredintheprocessofbeinginvadedbyrainwater,itwillalsoincreasegreasemoisture・Theincreaseofoilmoisturecannotonlyenhancethehy
8、drolysisofoil,increasethecontentoffreefattyacids,butalsoincreasetheactivityofenzymes,whichisbeneficialtothegrowthandbreedingofmicroorganisms.Therefore,theexcessivemoisturecontentin
