超高压处理对鲜榨橙汁香气的影响及异味控制措施研究

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1、合肥工业大学博士学位论文超高压处理对鲜榨橙汁香气的影响及异味控制措施研究姓名：王海翔申请学位级别：博士专业：农产品加工及贮藏工程指导教师：潘见20090501ABSTRACTOrangejuiceisfavomdbyconsumersbecauseofitsnutrient-rich．Atpresent，thethermalsterilizationprocessseriouslydamagethenaturalflavoroforangejuice。Ultra-highpressuretechnologyisthemostpr

2、omisingsubstituteforheatsterilizationinjuiceindustry．Ourlaboratorysuccessfullydevelopedtheorangejuiceproductbyultra-highpressuretomaximizethejuicetokeepthenaturalflavor．However,orangejuicewillproduceaslightoff-flavorafterhighpressuretreatment．Inordertofurtherimprovet

3、hesmellqualityoffleshjuice，thispaperwasfocusedonthecausesandtheformationmechanismofoff-flavor．Basedonthesestudies，thewayshowtoreducetheproductionofoff-flavourwerealsofound．Mainresearchfindingwasfollowing：1。Freshorangejuiceprocessedbyultra-highpressurecouldproduceasli

4、ghtoff-flavor嬲aresultoftheproductionsofa—terpineolandcarvone．a-terpineolWascreatedbyhydrationreactionoflimoneneandlinalooldegradation，whilecarvoneWillscreatedbyoxidationreactionoflimonene．2．Pressure@1)，temperature∞)，treatmenttime(功)werethreesignificantfactorsinfluenc

5、ingthe4．degradationsoflimoneneandlinaloolunderhi29hpressureandtherewerepositiveeffectondegradationwithincreasingofthreefactors．Therelationshipoflinalool(YI)orlimonene(I"2)concentrationsbetweenthreefactorscouldbeexpressedbytheregressionequationasfollows：lj；=2．65-0．55x

6、I一0．10x2—0．058x3—0．084xl工2—0．033x1戈3+0．00175x2x3一o．14x?一0．008025x；+0．28x；五=61．96—15．33xl一2．29x2—1．23x3+4．88x?一0．14x；+o．53x；-1．62xlx2—0．70xlX3+0．60x2工3Metalionsasacatalyzerinfluencingoxidationoflimoneneunderhighpressure，couldsignificantlyspeedupthedegradationoflimonen

7、e；whileitdidnotplayanimportantroleonthehydrationoflimoneneanddegradationoflinal001．AtpH2．8～5．2，thereWasanegativeeffectonlimonenedegradationwithincreasingofpHvalues；atpH5．2～6．0，thereWaSapositiveeffectonlimonenedegradationwithincreaSingofpHvalues；atpH2．8～6．0between，the

8、reWaSanegativeeffectOillinalooldegradationwithincreasingofpHvalues．Therelationshipoflinalool(y1)orlimonene(兄)concentrationsbetweent