Discrimination of storage shelf-life for mandarin by electronic nose technique

2008/05/29   下载量: 325

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Overthepastyears,electronicnosetechnologyopenedthepossibilitytoexploitinformationonaromaattributetoassessfruitripeninstageduringstorage.Theobjectiveinthisstudywastoevaluatethecapacityofelectronicnoseinmonitoringthechangeinvolatiproductionofmandarinduringdifferentstoragetreatments,andstorageshelf-lifeofmandarinwasevaluatedbymeasuringthechangeivolatileproductionofmandarinusingelectronicnosedevice(PEN2).Bycomparing,storageshelf-lifeofmandarinwasbettdistinguishedusingLinearDiscriminantAnalysis(LDA)thanPrincipalComponentAnalysis(PCA).PCAandLDAanalysiswerefcienttoclassifymandarinwiththesamestoragetimeinitsrespectivegroups;butthemethodsarenotefcienttoseparatethmandarinsbydifferentstoragetimes.Thecorrelationbetweenthemeasuredandpredictedvaluesoffruitqualityattribute(suchasolublesolidcontent,acidityandcompressionforce)showspoortoreasonablepredictionperformancebymeansofelectronicnossignals.Theresultsprovethatsensors2,7and9intheelectronicnosePEN2formandarinhaveahigherinuenceinthecurrentpatterle.Hence,nearlyasubsetoffewsensorscanbechosentoexplainallthevariance.Thisresultcouldbeusedinfurtherstudiestooptimizthenumberofsensorsandndbetterperformance.

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