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1、AbstractChinaistheoriginofteaplant,CamelliasinensisL.(O.Kuntz),andhasenormousteatypes.Accordingtothedifferentprocessingmethodsandteaquality,Chineseteacanbedividedintosixcategoriesasgreentea,yellowtea,whitetea,oolongtea,darktea,andblackteaintheorderoftheoxidationdegreeofteapolyp
2、henols.However,thisclassificationmethodeasilyleadstotradefrictionininternationalmarketsespeciallyEuropeanandAmericanmarkets.Oolongteaandwhiteteaarespecialteasandtheirworldwideconsumptionincreaseswiththeirhealthclaimsinrecentyears.Forascientificdefinitionofoolongteaandwhitetea,t
3、hefeasibilityofchemicalfactorsofteaqualityappliedtodiscriminateoolongteaandwhiteteawasexploitedtentativelyinthispaper.Thechemicalfactorsofteaquality,includingwater-extractablesolids,totalash,individualandtotalcatechins,caffeine,totalpolyphenols,totalfreeaminoacids,theanineaswel
4、lasreducingsugar,weredeterminedbyISOornationalstandardsinallteasamples.ThecollecteddatawereextractedbyprincipalcomponentsanalysiswithSPSS18.0softwareandseveraldiscriminantfactorswereextractedwhichreflectedthemostchemicalqualityinformation.Sequentially,bothFisherandBayesdiscrimi
5、nantmethodswereappliedtoestablishthediscriminantfunctionstodiscriminatebetweenoolongteasandwhiteteas.Finally,amutualandrepeatablediscrimantfunctionwasacquiredwhichwassuccessfullyusedtodiscriminatethetypesofunknownteasamples.Themainresultsacquiredinthispaperareasfollowing:1.Four
6、principalcomponentshavebeenextractedfromalloftheabovementionedteachemicalfactors,whicharetotalcatechins,freeaminoacids,theratioofsimplecatechinstototalcatechins,andtheratiooftotalcatechinstototalpolyphenols.2.AFisherdiscriminantfunctionbetweenoolongteasandwhiteteashasbeenestabl
7、ishedasafollowingequation.f1=0.102*Totalcatechins＋0.959*Freeaminoacids－15.73*(Simplecatechins/Totalcatechins)－0.674*(Totalcatechins/Polyphenols)－0.4773.ThreeBayesdiscriminantfunctionshavebeenachievedasthefollowingequations.Oolongtea=1.106*Totalcatechins＋2.622*Freeaminoacids＋71.
8、604*(SimpleIIIcatechins/Totalcatechins)＋34.16*(Totalca
