Sodium carboxymethyl cellulose, hu ua carboxymethyl cellulose (CMC) yog ib hom high-polymer fiber ether npaj los ntawm kev hloov tshuaj ntawm ntuj cellulose. Nws cov qauv feem ntau yog D-glucose chav tsev los ntawm β (1 → 4) glycosidic daim ntawv cog lus txuas nrog. Kev siv CMC muaj ntau yam zoo dua lwm cov khoom noj khoom haus thickeners.
01 CMC yog dav siv hauv cov khoom noj
(1) CMC muaj kev ruaj ntseg zoo
Nyob rau hauv cov khoom noj txias xws li popsicles thiab ice cream, nws muaj peev xwm tswj tau qhov tsim ntawm cov dej khov muaju, nce tus nqi nthuav dav thiab tswj cov qauv zoo ib yam, tiv thaiv melting, muaj qhov zoo thiab du saj, thiab whiten xim.
Hauv cov khoom noj siv mis, txawm tias nws yog mis nyuj, txiv hmab txiv ntoo mis los yog yogurt, nws tuaj yeem hnov mob nrog cov protein nyob hauv thaj tsam ntawm isoelectric point ntawm pH tus nqi (PH4.6) los tsim ib qho kev sib txuam nrog cov qauv, uas muaj txiaj ntsig zoo. stability ntawm emulsion thiab txhim kho cov protein tsis kam.
(2) CMC tuaj yeem sib xyaw nrog lwm cov stabilizers thiab emulsifiers
Hauv cov khoom noj thiab dej haus, cov chaw tsim khoom siv dav siv ntau yam stabilizers, xws li: xanthan gum, guar gum, carrageenan, dextrin, thiab lwm yam. Emulsifiers xws li: glycerol monostearate, sucrose fatty acid esters, thiab lwm yam. qhov zoo thiab ua lub luag haujlwm sib koom ua ke los txo cov nqi tsim khoom.
(3) CMC muaj pseudoplasticity
Lub viscosity ntawm CMC yog thim rov qab ntawm qhov kub sib txawv. Raws li qhov kub thiab txias, qhov viscosity ntawm cov tshuaj txo, thiab vice versa; Thaum lub zog shear tshwm sim, qhov viscosity ntawm CMC yuav txo qis, thiab nrog kev nce ntawm lub zog shear, lub viscosity yuav txo. Cov khoom no ua rau CMC txo cov khoom siv thauj khoom thiab txhim kho homogenization efficiency thaum nplawm, homogenizing, thiab kev thauj mus los ntawm cov kav dej, uas tsis sib xws los ntawm lwm cov stabilizers.
02 Cov txheej txheem xav tau
Raws li kev ruaj ntseg zoo, CMC yuav cuam tshuam nws cov txiaj ntsig yog tias siv tsis raug, thiab tseem ua rau cov khoom raug muab pov tseg. Yog li ntawd, rau CMC, nws yog ib qho tseem ceeb heev rau tag nrho thiab tusyees disperse qhov kev daws teeb meem los txhim kho nws efficiency, txo ntau npaum, txhim kho cov khoom zoo thiab nce yield. Tshwj xeeb, kev saib xyuas yuav tsum tau them rau txhua theem txheej txheem:
(1) Cov khoom xyaw
1. High-speed shear dispersion txoj kev nrog txhua yam quab yuam
Tag nrho cov cuab yeej uas muaj peev xwm sib tov tuaj yeem siv los pab CMC kom tawg mus rau hauv dej. Los ntawm kev kub ceev shearing, CMC tuaj yeem sib npaug hauv dej kom nrawm nrawm CMC tawg.
Qee cov tuam txhab lag luam tam sim no siv cov hmoov sib tov dej los yog cov twj tso kua mis sib xyaw ua haujlwm siab.
2. Qab zib qhuav sib tov dispersion txoj kev
Sib tov zoo nrog CMC thiab granulated qab zib nyob rau hauv ib tug ratio ntawm 1: 5, thiab sprinkle nws maj mam nyob rau hauv tas li stirring kom tag nrho cov CMC.
3. Dissolve nyob rau hauv saturated qab zib dej
Xws li caramel, thiab lwm yam, tuaj yeem ua kom nrawm nrawm ntawm CMC.
(2) Acid ntxiv
Rau qee cov dej haus acidic, xws li yogurt, cov khoom siv acid-resistant yuav tsum tau xaiv. Yog tias lawv ua haujlwm ib txwm, cov khoom lag luam tuaj yeem txhim kho thiab cov khoom los nag thiab stratification tuaj yeem tiv thaiv.
1. Thaum ntxiv cov kua qaub, qhov kub ntawm cov kua qaub ntxiv yuav tsum tau tswj nruj me ntsis, feem ntau ≤20 ° C.
2. Cov kua qaub concentration yuav tsum tau tswj ntawm 8-20%, qhov qis dua qhov zoo dua.
3. Cov kua qaub ntxiv tau siv txoj kev txau, thiab nws tau ntxiv raws li cov kev taw qhia tangential ntawm lub thawv piv, feem ntau 1-3 feeb.
4. Slurry ceev n=1400-2400r/m
(3) Homogeneous
1. Lub hom phiaj ntawm emulsification
Homogeneous, muaj roj-muaj kua pub, CMC yuav tsum tau compounded nrog ib tug emulsifier, xws li monoglyceride, homogenization siab yog 18-25mpa, thiab kub yog 60-70 ° C.
2. Decentralized lub hom phiaj
Homogenization, yog tias cov khoom xyaw ntau yam nyob rau theem pib tsis zoo tag nrho, tseem muaj qee qhov me me, nws yuav tsum tau homogenized, homogenization siab yog 10mpa, thiab qhov kub ntawm 60-70 ° C.
(4) Sterilization
CMC ntawm qhov kub thiab txias, tshwj xeeb tshaj yog thaum kub siab tshaj 50 ° C rau ib lub sij hawm ntev, lub viscosity ntawm CMC nrog tsis zoo yuav txo irreversibly. Lub viscosity ntawm CMC ntawm cov tuam txhab lag luam dav dav yuav poob siab ntawm 80 ° C rau 30 feeb, yog li kev siv tshuaj tua kab mob tam sim lossis barization tuaj yeem siv tau. Txoj kev Sterilization kom luv lub sij hawm ntawm CMC ntawm qhov kub thiab txias.
(5) Lwm yam kev ceev faj
1. Cov dej xaiv tau zoo yuav tsum huv thiab kho cov kais dej kom ntau li ntau tau. Cov dej zoo yuav tsum tsis txhob siv kom tsis txhob muaj kab mob microbial thiab cuam tshuam rau cov khoom zoo.
2. Cov khoom siv rau kev sib cais thiab khaws cia CMC tsis tuaj yeem siv rau hauv cov thawv hlau, tab sis cov thawv stainless hlau, cov thawv ntoo, lossis cov thawv ceramic tuaj yeem siv tau. Tiv thaiv cov infiltration ntawm divalent hlau ions.
3. Tom qab txhua qhov kev siv CMC, lub qhov ncauj ntawm lub hnab ntim khoom yuav tsum tau muab khi kom nruj kom tsis txhob nqus cov dej noo thiab ua kom tsis zoo ntawm CMC.
03 Cov lus teb rau cov lus nug hauv kev siv CMC
Cov viscosity tsawg, nruab nrab-viscosity, thiab high-viscosity txawv li cas? Puas yuav muaj qhov sib txawv ntawm qhov sib xws?
Teb:
Nws tau nkag siab tias qhov ntev ntawm cov saw hlau molecular txawv, lossis qhov hnyav molecular txawv, thiab nws muab faib ua qis, nruab nrab thiab siab viscosity. Tau kawg, qhov kev ua tau zoo macroscopic sib haum rau qhov sib txawv viscosity. Tib qhov concentration muaj qhov sib txawv viscosity, khoom ruaj khov thiab acid piv. Kev sib raug zoo ncaj qha feem ntau yog nyob ntawm qhov kev daws teeb meem ntawm cov khoom.
Dab tsi yog qhov kev ua yeeb yam tshwj xeeb ntawm cov khoom lag luam nrog qib kev hloov pauv saum toj 1.15? Hauv lwm lo lus, qhov siab dua qhov kev hloov pauv, qhov kev ua tau zoo ntawm cov khoom tau txhim kho?
Teb:
Cov khoom muaj kev hloov pauv siab, nce fluidity, thiab txo qis pseudoplasticity. Cov khoom lag luam nrog tib lub viscosity muaj kev hloov pauv siab thiab muaj kev xav pom tseeb dua. Cov khoom uas muaj kev hloov pauv siab muaj cov tshuaj ci ntsa iab, thaum cov khoom uas muaj cov kev hloov pauv dav dav muaj cov tshuaj dawb.
Puas yog nws zoo los xaiv qhov nruab nrab viscosity los ua fermented protein haus?
Teb:
Cov khoom nruab nrab thiab qis viscosity, qib ntawm kev hloov pauv yog li 0.90, thiab cov khoom uas muaj cov kua qaub zoo dua.
Yuav ua li cas CMC yaj sai sai? Qee zaum, tom qab boiling, nws dissolves maj mam.
Teb:
Sib tov nrog lwm cov colloids, los yog disperse nrog 1000-1200 rpm agitator.
Lub dispersibility ntawm CMC tsis zoo, lub hydrophilicity yog qhov zoo, thiab nws yog ib qho yooj yim rau pawg, thiab cov khoom uas muaj kev hloov pauv qib yog pom tseeb dua! Cov dej sov so sai dua li dej txias. Boiling feem ntau tsis pom zoo. Kev ua noj ua haus ntev ntawm CMC cov khoom yuav rhuav tshem cov qauv molecular thiab cov khoom yuav poob nws cov viscosity!
Post lub sij hawm: Dec-13-2022