大米天然防霉保鮮劑的研究.pdf

1、江南大學(xué)碩士學(xué)位論文大米天然防霉保鮮劑的研究姓名：陳偉暢申請學(xué)位級別：碩士專業(yè)：糧食、油脂及植物蛋白工程指導(dǎo)教師：張暉郭曉娜20080801AbstractAbstractRice(OryzasativaL1isoneofthemaingraincropsinChinaItiseasytoagingandmildewbecauseofmoistureabsorptionatthehightemperatureandhumiditywea

2、therconditioninthesouthofChinaasaresult，itbringsalargeamountofwasteHowtokeepthericefreshintheprocessofstorageandlogisticsisaveryimportantsubjectinChinaItispopularofusingchemicalmouldinhibitorsodiumdiacetateforkeepingther

3、icefreshatpresentWiththegreenconsumptionconsciousnessgettingstrongerthereisanewtrendtokeepthericefreshbytheplantextracts，insteadofsodiumdiacetateDifferentplantswereselectedasresearchmaterialsinthisworkSystematicstudieswe

4、recardedoutontheextraction，antifungalactivityandantioxidantactivityofthescreeningplantAccordingtotheresultsoftheantifungaltests，gingerextractsshowedthestrongestantifungalactivityagainstthepenicilliumfromthericeamongthete

5、ndifferentplantextracts，boththewaterextractandethanolextractdisplayedstronginhibitingabilityComponentanalysisofthegingerextractswithwater60％ethan0135％acetoneormethanolwasinvestigatedTheresultsshowedthatthewaterextracthad

6、muchmorepolysaccharides，besidethemethanolextracthadmuchmoregingerolsThegingerextractsweretestedagainstthepenicilliumbytheagarwelldiffusionassayGingerolsdisplayedstrongantifungalactivitygingerpolysaccharidesshowednoantifu

7、ngalactivityTherewerenosignificantdifferencesofantifungalpropertiesamongthefoursolventextractsTheMICvalueofthewaterextractis(0006___0002)g／mL，andtheMICvalueofsodiumdiacetateis(0005O001)g／mLTheresultsshowedthatmouldinhibi

8、torwouldhaveeffectwhentheconcentrationreached5mg／mLTheantioxidantactivityofgingerextractswereinvestigatedusingdifferentantioxidanttestsinvitroTheresultsshowedthatgingerextractsdisplayedstrongantioxidantproperties，andthea

9、ntioxidantactivitywouldincreasewiththeconcentrationofsamplesincreasingThereducingpowerofsampleswerefollowedthisorder：methanolextractethanolextractacetoneextractwaterextract，gingerols’reducingpowerwasbetweenBHTandVc，ginge

10、rPolysaccharideshadnoreducingpowerTheresultsofgingerextracts’radical—scavengingactivitiesshowedthattheIC50ofwaterextract，ethanolextract，acetoneextractmethanolextract，gingerolsandVcWas5231Itg／mL，4287Itg／mL，5113I_tg／mL，376

11、2Itg／mL，467Itg／mLand4501ag／mLTheantioxidantactivityinpreventingtheperoxidationoflinoleicacidfollowedtheorder：Vcgingerolsmethanolextractethanolextract≈acetoneextractwaterextractThegingerextractscoatingricecouldlowerthefat

12、tyacidvalueofriceanddelayriceagingeffectivelyTheratioofthenewricepreservationiswaterextractofginger：trehalose：Vc=2：1：0519preservationWasdissolvedin100mLwater，lmLsolutioncouldcoat509riceThecookingpropertiesandstoringeffec

13、tsofthecoatedricewereevaluated，theresultsindicatedthatthemoldproofabilityofthericepreservationdesignedbythisworkwasallsquarewithsimulatedsaledoneChemicalmouldinhibitorsodiumdiacetatecouldbeinsteadbythewaterextractofginge