Qhov sib txawv tseem ceeb ntawm gelatinization thiab retrogradation yog tias gelatinization yog hais txog kev ua los yog ua gelatinous, whereas retrogradation yog hais txog cov lus tsa suab hauv retrograde.
Cov ntsiab lus gelatinization thiab retrogradation piav qhia txog cov khoom ntawm cov hmoov txhuv nplej siab. Cov hmoov txhuv nplej siab yog ib qho polymeric carbohydrate uas muaj ntau cov piam thaj uas tau koom nrog glycosidic bonds. Nws yog ib qho polysaccharide uas yog tsim los ntawm feem ntau ntawm cov nroj tsuag ntsuab ua ib qho khoom siv hluav taws xob.
YGelatinization yog dab tsi?
Gelatinization yog kev rhuav tshem ntawm cov khoom sib txuas ntawm cov hmoov txhuv nplej siab molecules, tso cai rau cov chaw sib txuas ntawm hydrogen kom koom nrog ntau cov dej molecules. Feem ntau, peb siv lo lus no los piav txog cov hmoov txhuv nplej siab, yog li nws feem ntau hu ua starch gelatinization. Thaum muaj dej thiab cua sov, cov kev sib cuam tshuam ntawm cov hmoov txhuv nplej siab molecules zoo li tawg thiab, cov chaw hydrogen bonding muaj peev xwm tuav tau cov dej molecules ntau dua hauv cov chaw no. Tom qab ntawd, cov hmoov txhuv nplej siab tau yaj hauv dej irreversibly thiab ua raws li ib tug plasticizer.
Daim duab 01: Rice Starch pom ntawm Lub Teeb Microscope
Cov txheej txheem ntawm gelatinization tshwm sim nyob rau hauv peb kauj ruam: hmoov txhuv nplej siab granule o, melting, thiab amylose leaching. Thaum peb sov cov hmoov txhuv nplej siab, o tshwm sim vim qhov nqus dej rau hauv qhov chaw amorphous ntawm cov hmoov txhuv nplej siab. Tom qab ntawd, cov dej nkag mus rau hauv cov cheeb tsam nruj ntawm cov hmoov txhuv nplej siab, uas muaj cov qauv helical ntawm amylopectin. Feem ntau, dej tsis tuaj yeem nkag mus rau thaj tsam no, tab sis cua sov tso cai rau qhov no tshwm sim. Tom qab ntawd qhov kev nkag mus ntawm cov dej ua rau nce qhov sib txawv ntawm cov hmoov txhuv nplej siab, uas ua rau cov hmoov txhuv nplej siab disintegration.
Muaj qee yam uas cuam tshuam rau cov txheej txheem gelatinization nrog rau hom nroj tsuag uas tau txais cov hmoov txhuv nplej siab, cov dej muaj nyob hauv nruab nrab, pH, concentration ntawm ntsev hauv nruab nrab, qab zib, cov protein thiab cov rog.
Retrogradation yog dab tsi?
Retrogradation yog tshuaj lom neeg cov tshuaj tiv thaiv uas tshwm sim thaum amylose thiab amylopectin chains nyob rau hauv siav gelatinized starch realign lawv tus kheej thaum txias cov hmoov txhuv nplej siab. Hauv lwm lo lus, nws yog cov lus tsa suab ntawm cov saw hlau polymer no hauv kev rov qab los.
Yog tias peb sov cov hmoov txhuv nplej siab thiab yaj hauv dej, nws ua rau kev puas tsuaj ntawm cov qauv crystalline ntawm amylose thiab amylopectin molecules, uas ua rau dej thiab tsim cov kua dej khov. Yog hais tias peb txias cov kua nplaum no los yog cia nws nyob rau hauv qhov kub thiab txias, linear molecules (amylose) thiab linear qhov chaw ntawm amylopectin molecules yuav retrograde thiab rearrange lawv tus kheej dua, tsim ib tug ntau crystalline qauv. Cov kab tawm ntawm cov molecules zoo li tso lawv tus kheej mus rau qhov sib npaug, tsim cov txuas txuas hydrogen. Hauv cov txheej txheem no, peb tuaj yeem pom tias amylose crystallization sai dua li amylopectin crystallization.
Tsis tas li ntawd, retrogradation tuaj yeem ua rau tshem tawm cov dej los ntawm lub network polymer. Cov txheej txheem no hu ua syneresis. Txawm li cas los xij, peb tuaj yeem soj ntsuam cov dej me me rau saum cov gel. Cov txheej txheem retrogradation no ncaj qha cuam tshuam rau staling lossis aging ntawm qhob cij. Ntxiv mus, retrograded starch yog tsawg digestible. Txawm li cas los xij, kev hloov kho tshuaj ntawm cov hmoov txhuv nplej siab tuaj yeem ua rau txo qis lossis txhim kho cov txheej txheem retrogradation. Additives xws li rog, qabzib, sodium nitrate, thiab lwm yam tuaj yeem txo cov txheej txheem retrogradation ntawm starch.
Qhov txawv ntawm Gelatinization thiab Retrogradation yog dab tsi?
Gelatinization thiab retrogradation yog cov khoom ntawm cov hmoov txhuv nplej siab uas sib txawv nrog cov cua sov. Gelatinization yog kev rhuav tshem ntawm kev sib cuam tshuam ntawm cov hmoov txhuv nplej siab molecules, tso cai rau cov chaw sib txuas ntawm hydrogen kom koom nrog ntau cov dej molecules. Retrogradation, ntawm qhov tod tes, yog cov tshuaj tiv thaiv uas tshwm sim thaum amylose thiab amylopectin chains hauv siav, gelatinized starch realign lawv tus kheej thaum txias cov hmoov txhuv nplej siab. Qhov sib txawv tseem ceeb ntawm gelatinization thiab retrogradation yog tias gelatinization yog hais txog kev ua los yog ua gelatinous, whereas retrogradation yog hais txog cov lus tsa suab nyob rau hauv retrograde yam.
Hauv qab infographic tabulates ntau qhov sib txawv ntawm gelatinization thiab retrogradation.
Summary – Gelatinization vs Retrogradation
Gelatinization thiab retrogradation yog cov khoom ntawm cov hmoov txhuv nplej siab uas muaj cua sov heev. Qhov sib txawv tseem ceeb ntawm gelatinization thiab retrogradation yog hais tias gelatinization yog hais txog kev ua los yog ua gelatinous, whereas retrogradation yog hais txog cov lus tsa suab hauv retrograde.
