Hauj lwm lawm
Siv
Xanthan gum, 1 feem pua, tuaj yeem tsim cov viscosity ntawm cov kua.
Hauv cov khoom noj, xanthan cov pos hniav yog muaj nyob rau hauv cov khaub ncaws hnav thiab cov kua ntses. Nws pab tiv thaiv cov roj sib cais los ntawm stabilizing lub emulsion, txawm tias nws tsis yog emulsifier. Pab tshem tawm cov khoom siv, xws li cov txuj lom thiab pab tsim cov kev ntxhib los mos hauv ntau cov dej khov nab kuab. Cov tshuaj txhuam hniav feem ntau muaj nws ua cov ntawv khi kom cov khoom sib xws. Kuj tseem pab ua kom cov qe ua lag luam ua los ntawm cov qe dawb, los hloov cov rog thiab emulsifiers pom hauv yolks. Nws kuj yog ib txoj kev nyiam ntawm cov kua dej thickening rau cov neeg uas nqos cov kab mob, vim nws tsis hloov xim lossis tsw ntawm cov zaub mov lossis dej haus ntawm cov qib kev siv. Hauv gluten-dawb ci, xanthan cov pos hniav yog siv los muab lub khob noom cookie los yog batter lub nplaum uas yuav tsis ua tiav nrog gluten. Hauv cov khoom noj feem ntau nws yog siv ntawm qhov ntau ntawm 0.5 feem pua lossis tsawg dua. Nws yog dav siv nyob rau hauv ntau yam khoom noj khoom haus, xws li kua ntses, hnav khaub ncaws, nqaij thiab nqaij qaib cov khoom, bakery khoom, confectionery khoom, dej haus, khoom noj siv mis, thiab lwm yam.
Nyob rau hauv kev lag luam roj, Nws yog siv nyob rau hauv ntau qhov ntau kom thicken drilling av nkos.Cov kua dej no nqa cov khib nyiab txiav los ntawm qhov drilling me ntsis rau saum npoo. Xanthan cov pos hniav muab zoo "kawg kawg" rheology. Thaum kev khiav tsis tau, cov khib nyiab tseem raug tshem tawm hauv cov dej drilling. Kev siv dav dav ntawm kab rov tav drilling thiab qhov kev thov kom muaj kev tswj xyuas zoo ntawm cov khoom siv drilling tau ua rau nws nthuav dav siv. Nws tau raug ntxiv rau cov pob zeb ua dej hauv qab dej, kom nws cov viscosity thiab tiv thaiv kev ntxuav tawm.
Nyob rau hauv cov tshuaj pleev ib ce, nws yog siv los npaj cov dej gels.Nws kuj yog siv nyob rau hauv cov roj-hauv-dej emulsions los txhim kho cov tee dej coalescence.Nws yog nyob rau hauv kev tshawb fawb ua ntej rau nws cov peev xwm siv nyob rau hauv cov ntaub so ntswg engineering los tsim hydrogels thiab scaffolds txhawb peb-dimensional ntaub so ntswg tsim. .Tsis tas li ntawd, thiolated xanthan gum (saib thiomers) tau pom muaj peev xwm rau kev xa tshuaj, txij li los ntawm covalent txuas ntawm thiol pawg mus rau qhov no polysaccharide siab mucoadhesive thiab permeation txhim kho cov khoom tuaj yeem qhia tau.
Txiav thinning
Lub viscosity ntawm xanthan cov pos hniav daws txo qis nrog cov nqi shear ntau dua. Qhov no yog hu ua shear thinning los yog pseudoplasticity. Qhov no txhais tau hais tias cov khoom raug txiav, txawm tias los ntawm kev sib xyaw, co lossis zom yuav nyias. Thaum lub zog shear raug tshem tawm, cov zaub mov yuav thicken dua. Hauv kev hnav khaub ncaws hnav khaub ncaws, qhov sib ntxiv ntawm nws ua rau nws tuab txaus thaum so hauv lub raj mis kom cov sib tov sib xyaw kom haum, tab sis lub zog shear generated los ntawm co thiab pouring thins nws, yog li nws yuav yooj yim poured. Thaum nws tawm hauv lub raj mis, lub zog shear raug tshem tawm thiab nws thickens dua, yog li nws clings rau zaub xam lav.
Tus nqi siv
Qhov ntau dua qhov sib piv ntawm xanthan cov pos hniav ntxiv rau cov kua, cov kua yuav ua kom tuab dua. Ib qho emulsion tuaj yeem tsim nrog tsawg li 0.1 feem pua (los ntawm qhov hnyav). Kev nce cov pos hniav ua rau cov pos hniav thicker, ruaj khov emulsion txog li 1 feem pua xanthan cov pos hniav. Ib tug teaspoon ntawm nws hnyav li 2.5 grams thiab nqa ib khob (250 ml) dej mus rau ib tug 1 feem pua concentration.[6][13]
Ua npuas ncauj, {{0}}.2–{4}}.8 feem pua xanthan gum feem ntau yog siv. Cov nyiaj ntau dua ua rau cov npuas loj dua thiab ua npuas ncauj ntau dua. Qe dawb hmoov (0.2–2.0 feem pua ) nrog 0.1–0.4 feem pua xanthan cov pos hniav yields npuas zoo ib yam li xab npum npuas.
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