Casein vs Whey
Mis yog cov kua xim dawb uas muaj ntau cov as-ham. Nws yog tsim los ntawm cov qog mammary ntawm cov tsiaj nyeg thiab muab tag nrho cov khoom tsim nyog uas xav tau rau cov menyuam yaus txoj kev loj hlob. Cov muaj pes tsawg leeg ntawm nws txawv ntawm tsiaj mus rau tsiaj. Feem ntau cov mis nyuj muaj protein ntau, qab zib, rog, vitamins, minerals, thiab lwm yam.
Casein
Casein yog ib qho ntawm cov proteins loj uas pom hauv cov mis nyuj. Nws yog ib tsev neeg ntawm cov proteins. Lawv feem ntau pom muaj nyob rau hauv cov mis nyuj mis. Nyob rau hauv nyuj cov mis nyuj, muaj casein txog li 80%, tab sis nyob rau hauv tib neeg cov mis nyuj, nws yog hais txog 20 mus rau 45%.
Casein proteins yog phosphoproteins. Casein muaj ntau ntawm proline amino acids uas tsis cuam tshuam, thiab lawv tsis muaj disulfide bonds. Yog li ntawd, casein tsis muaj cov qauv zoo tertiary. Nws yog ntau hydrophobic; yog li ntawd, tsis yaj zoo hauv dej. Txij li nws yog phosphoprotein, nws muaj phosphate pawg; yog li ntawd, nws muab tus nqi tsis zoo rau cov mis nyuj. Lub isoelectric point ntawm casein yog 4.6. Tias yog vim li cas thaum ib qho kua qaub ntxiv rau cov mis nyuj, casein nyiam los nag.
Whey
Whey yog cov khoom lag luam tom qab tsim curd, cheese lossis casein. Thaum curd yog tsim, ib feem ntawm nws yog curdled, thiab cov kua mis yog tshuav. Curdling txheej txheem yog stimulated los ntawm kev ntxiv rennet los yog ib tug acidic tshuaj uas yog edible. Cov kua mis no hu ua whey.
Whey yog ib yam khoom muaj dej thiab qee zaum muaj xim xiav. Whey tuaj yeem tsim los ntawm txhua hom tsiaj cov mis nyuj. Whey muaj txiaj ntsig hauv ntau txoj hauv kev, thiab nws muaj txiaj ntsig kev lag luam. Nws yog siv los tsim ntau yam khoom xws li ricotta, xim av cheese rau tib neeg noj. Nws kuj tseem ntxiv rau qee yam khoom noj thaum npaj.
Mis muaj ntau yam proteins. Casein yog ib qho ntawm cov proteins loj hauv cov mis nyuj. Thaum casein raug tshem tawm los ntawm cov mis nyuj, cov proteins uas tseem tshuav yog hu ua whey proteins. Whey muaj cov whey proteins. Nws yog kwv yees li 20% ntawm nyuj cov mis nyuj (kwv yees li 80% yog casein). Hauv tib neeg cov mis nyuj, muaj txog 60% whey proteins. Yog li whey protein yog ib txwm pom nyob rau hauv cov mis nyuj. Nws muaj ob peb globular proteins. Lawv yog beta lactoglobulin, alpha lactalbumin, serum albumin thiab immunoglobulin.
Vim tias whey proteins suav nrog tag nrho cov amino acids tseem ceeb, nws yog ib qho kev pom zoo noj zaub mov ntxiv ntawm cov amino acids. Nws kuj yog ib qhov zoo ntawm branched saw amino acids. Nws muaj qhov zoo ntawm kev txo cov kab mob plawv, mob qog noj ntshav thiab ntshav qab zib. Lwm yam tshaj li cov proteins, whey muaj cov vitamins, lactose, minerals, thiab me ntsis roj.
Casein thiab Whey
