双酯化 学淀粉的制备及其在南瓜面条中的应用

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1、双酯化淀粉的制备及其在南瓜面条中的应用AbstractIntheprocessofultrasonicpretreatrnentandmicrowaveresponseofdryphosphate，thephosphoryldegreeofsubstitution(DS1)isusedasallindicatortotesttheeffectoncolstarchphosphatewhenultrasonictime，ultrasonicpower,reactiontimeofmicrowave，themicrowavereactionpower,theamountofwater

2、contentandesterifieationagentare(1)Thendeterminedbyorthogonalexperiments，theoptimalreactionconditionsforcornstarchphosphateisthemicrowavepower400W,reactiontime5min,thereactiontoaddwatercontentof20％，esterifieationdosageof7％．Byusingthedifferentphosphoryldegreeofsubstitutionofstarchtotesttheirtr

3、ansmittance，andfreeze-thawstability,gelatinizationtemperature，andrheologicalproperties，ithasbeenfoundthatthetransmittanceincreaseto48．3％，compared丽mtheoriginalcornstarch，itincreaseofabout30％；freeze-thawstabilityincreased谢廿lthedegreeofsubstitutionrise；pastingtemperaturedecreased、Ⅳi缸ltheriseofth

4、edegreeofsubstitution，amaximumtemperaturedecreasedby5℃，thelowestpastingtemperatureis64．2℃；Andsignificantlyimprovethestabilityofthestarchpasteviscosity,starchgelstrengthhasincreased．(2)TheIRspectraindicatethattheP-0-C，akindofphosphorusesterskey,isexistinthesample，andthemicrowavesemidrycanmakea

5、neffectiveresponsebetweenthestarchandesterificationagent．XRDexperimentresultsshowthatthecrystallinityofcornstarchis59．15％，afterultrasonictreatrnent,thecrystallinityis50．61％，indicatingthattheultrasonictreatmentCanreducecomstarchcrystallinity．(3)Intheprocessofful'theraceticacidesterificationwet

6、reactiontothepreparationofDi—esterifiedstarch,theacetyldegreeofsubstitution(DS2)isusedasanindicatortotesttheeffectontheprocesswhentemperature，time，effectofpHandtheamountofesterificationagentarechanged．Thendeterminedbyorthogonalexperiments，theoptimumreactionconditionsforaceticacidesterificatio

7、nstep25。Creactiontemperature，reactiontime60nlin,25％oftheamOuntofesterificationagent,pHvalueof8，andthebestDi-esterifiedcornstarchacetyldegreeofsubstitutionis0．3099．(4)Throughusingdifferentacetyldegreeofsubstitutionofstarchtotesttheir3华中农业大学201