黄花菜抗氧化性研究

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1、IntroductionDaylilyflowershavebeenusedasavegetableandmedicinalherbforalonghistoryinChina.Bothfreshanddrieddaylilyflowersarewidelyconsumed.Daylilieshavebeenreportedtopossessantidepressantproperties,reduceinflammation,andpromotedigestion.Pharmacologicalstudies

2、haveshownthatdayliliescanfacilitateneurologicalchangesinsleepingmiceandimpactmotoractivityinratsasaresultofalterationtothenormallevelsofseveralcentralnervoussystemneurotransmitters.(黄花菜4)Researchshowsascorbicacid、b-caroteneandphenoliccompoundsattributetodayl

3、ilyflowers'possessingoftheantioxidantproperties.Daylilyflowerdevelopmentandsenescencewascategorisedintosevenstages,eachseparatedbyoneday.FlowerrespirationwasonlyrelativelyconstantthroughStageItoIII.(Flowersenesceneindaylily)Thusfreshdaylilyflowersaredifficul

4、ttostoreandaresubjecttodeteriorationafterharvest.Drieddaylilyflowersareavailablethewholeyearandcanbestored,whichmakesthemtheconventionalandstableformofdaylilyflowerproducts.Variousdryingmethodssuchasfreeze-dryingandhot-airdryinghavebeenappliedtodaylilyflower

5、processing.Hot-airdryingisrelativelycheapandisthemostwidelyusedmethodforfoodproduction.Majorproblemsconcernedwithairdehydrationareconsiderableshtinkagecausedbycellcollapsefollowingthelossofwater,poorrehydrationcharacteristicsofthedriedproductandunfavorablech

6、angesincolour,texture,flavourandnutritivevaluecausedbydrying.Freeze-dryinggiveshighproductqualitybutatarelativelyhighproductioncost.Theeffectofvariousdryingtreatmentsonthecarotenoidstabilityinthedaylilyflowershasalsobeenstudied.Applicationofinfrareddryingtof

7、ooddryingisrecentlyofspecialinterestbecauseoftheprogressinradiatorconstruction.Studiesshowthatinfraredradiationmethodisquickerthanconvection-basedmethods.Theeffectofhot-airdryingandfreeze-dryingonantioxidantactivitiesofdaylilyflowershavebeencomparedandstudie

8、d.However,infrareddryingofdaylilyflowersanditseffectonantioxidantactivitiesarerarelyreported.Theobjectiveofthestudyistocomparehot-airdryingandinfrareddryingofdaylilyflowersandtheeffectofinfrared