CMC siv hauv cov khoom noj
Sodium carboxymethyl cellulose (carboxymethyl cellulose, sodium CMC) yog carboxymethylated derivative ntawm cellulose, tseem hu ua cellulose gum, thiab yog cov pos hniav ionic cellulose tseem ceeb tshaj plaws.
CMC feem ntau yog anionic polymer compound tau los ntawm reacting natural cellulose nrog caustic alkali thiab monochloroacetic acid. Qhov hnyav molecular ntawm lub compound yog los ntawm ntau txhiab mus rau ib lab. unit knot ntawm ib tug molecule
CMC belongs rau kev hloov kho ntawm natural cellulose. Tam sim no, Lub Koom Haum Saib Xyuas Khoom Noj thiab Kev Ua Liaj Ua Teb ntawm United Nations (FAO) thiab Lub Koom Haum Saib Xyuas Kev Noj Qab Haus Huv Ntiaj Teb (WHO) tau hu ua nws "hloov cellulose". Cov txheej txheem synthesis ntawm sodium carboxymethyl cellulose tau tsim los ntawm German E.Jansen hauv xyoo 1918, thiab tau patented hauv 1921 thiab ua rau lub ntiaj teb paub, txij thaum ntawd los nws tau ua lag luam nyob hauv Europe.
CMC tsuas yog siv rau cov khoom siv raw, xws li colloid thiab binder. Los ntawm 1936 txog 1941, kev tshawb fawb kev lag luam ntawm sodium carboxymethyl cellulose tau ua haujlwm heev, thiab ntau qhov kev pom zoo patent tau luam tawm. Thaum Ntiaj Teb Tsov Rog II, Lub Tebchaws Yelemees tau siv CMC hauv cov khoom siv hluavtaws ua tus neeg sawv cev tiv thaiv, Thiab ua ib qho kev hloov pauv rau qee cov pos hniav (xws li gelatin, cov pos hniav arabic), CMC kev lag luam tau tsim zoo heev.
CMC yog dav siv hauv roj av, geological, tshuaj txhua hnub, zaub mov, tshuaj thiab lwm yam lag luam, hu ua "kev lag luam monosodium glutamate".
01 PART
Cov yam ntxwv ntawm CMC
CMC yog cov hmoov dawb los yog daj me ntsis, granular lossis fibrous khoom. Nws yog cov tshuaj macromolecular uas tuaj yeem nqus dej thiab o. Thaum o hauv dej, nws tuaj yeem tsim cov kua nplaum pob tshab. Lub pH ntawm aqueous suspension yog 6.5-8.5. Cov tshuaj yog insoluble nyob rau hauv cov organic solvents xws li ethanol, ether, acetone thiab chloroform.
Khoom CMC ruaj khov rau lub teeb thiab chav tsev kub, thiab tuaj yeem khaws cia rau lub sijhawm ntev hauv qhov chaw qhuav. CMC yog ib hom cellulose ether. Nws feem ntau yog ua los ntawm cov paj rwb luv luv (cov ntsiab lus cellulose txog li 98%) lossis ntoo pulp, uas tau kho nrog sodium hydroxide thiab tom qab ntawd ua rau cov tshuaj sodium monochloroacetate. Qhov hnyav molecular ntawm cov compound yog 6400 (± 1000). Feem ntau muaj ob txoj kev npaj: txoj kev thee-dej thiab txoj kev hnyav. Tseem muaj lwm cov nroj tsuag fibers uas siv los ua CMC.
02 PART
Nta thiab Daim Ntawv Thov
CMC tsis yog tsuas yog ib qho zoo emulsion stabilizer thiab thickener nyob rau hauv daim ntawv thov zaub mov, tab sis kuj muaj zoo heev khov thiab melting stability, thiab tuaj yeem txhim kho qhov tsw ntawm cov khoom thiab ntev lub sij hawm cia.
Xyoo 1974, Lub Koom Haum Saib Xyuas Khoom Noj thiab Kev Ua Liaj Ua Teb ntawm United Nations (FAO) thiab Lub Koom Haum Saib Xyuas Kev Noj Qab Haus Huv Ntiaj Teb (WHO) tau pom zoo siv CMC ntshiab rau cov zaub mov tom qab kev tshawb fawb thiab kev sim tshuaj lom neeg thiab tshuaj lom neeg. Kev noj qab haus huv thoob ntiaj teb tus qauv (ADI) yog 25mg / kg lub cev hnyav / hnub.
2.1 Thickening thiab emulsification stability
Noj CMC tuaj yeem ua lub luag haujlwm hauv emulsification thiab stabilization ntawm cov dej haus uas muaj roj thiab cov protein. Qhov no yog vim CMC dhau los ua pob tshab ruaj khov colloid tom qab tau yaj hauv dej, thiab cov khoom siv protein ua cov khoom nrog tib tus nqi raws li kev tiv thaiv ntawm cov yeeb yaj kiab colloid, uas tuaj yeem ua rau cov khoom muaj protein nyob hauv lub xeev ruaj khov. Nws kuj muaj cov nyhuv emulsification, yog li tib lub sijhawm, nws tuaj yeem txo qhov nro ntawm cov roj thiab dej, kom cov roj tuaj yeem ua tiav emulsified.
CMC tuaj yeem txhim kho qhov ruaj khov ntawm cov khoom vim tias thaum pH tus nqi ntawm cov khoom sib txawv los ntawm isoelectric point ntawm cov protein, sodium carboxymethyl cellulose tuaj yeem tsim cov qauv tsim nrog cov protein, uas tuaj yeem txhim kho kev ruaj ntseg ntawm cov khoom.
2.2 Nce bulkiness
Kev siv CMC hauv cov dej khov nab kuab tuaj yeem ua rau muaj kev nthuav dav ntawm cov dej khov nab kuab, txhim kho cov melting ceev, muab cov duab zoo thiab saj, thiab tswj qhov loj thiab kev loj hlob ntawm cov dej khov nab kuab thaum thauj thiab khaws cia. Tus nqi siv yog 0.5% ntawm tag nrho. Qhov piv yog ntxiv.
Qhov no yog vim CMC muaj dej tuav zoo thiab dispersibility, thiab organically sib txuas cov protein, rog globules thiab dej molecules nyob rau hauv colloid los tsim ib tug uniform thiab ruaj khov system.
2.3 Hydrophilicity thiab rehydration
Cov cuab yeej ua haujlwm no ntawm CMC feem ntau yog siv rau hauv kev tsim cov qhob cij, uas tuaj yeem ua rau lub ntsej muag sib txawv, nce ntim, txo cov slag, thiab tseem muaj cov nyhuv ua kom sov thiab tshiab; cov noodles ntxiv nrog CMC muaj cov dej tuav zoo, ua noj ua haus thiab saj zoo.
Qhov no yog txiav txim los ntawm cov qauv molecular ntawm CMC, uas yog ib tug cellulose derivative nrog ib tug loj tus naj npawb ntawm hydrophilic pawg nyob rau hauv lub molecular saw: -OH pawg, -COONa pawg, yog li CMC muaj zoo hydrophilicity tshaj cellulose thiab dej tuav peev xwm.
2.4 Cov
Thixotropic CMC txhais tau hais tias cov macromolecular chains muaj qee qhov kev sib cuam tshuam thiab zoo li tsim cov qauv peb sab. Tom qab tsim peb-seem qauv, viscosity ntawm cov tshuaj nce, thiab tom qab cov qauv peb-dimensional tawg, viscosity txo. Qhov tshwm sim ntawm thixotropic yog qhov pom tseeb viscosity hloov nyob ntawm lub sijhawm.
Thixotropic CMC plays lub luag haujlwm tseem ceeb hauv gelling system thiab tuaj yeem siv los ua jelly, jam thiab lwm yam khoom noj.
2.5 tuaj yeem siv los ua tus neeg saib xyuas kom meej, ua npuas ncauj stabilizer, ua kom lub saj
CMC tuaj yeem siv rau hauv kev tsim cov cawv txiv hmab los ua kom lub saj ntau mellow thiab nplua nuj, thiab tom qab saj yog ntev; nyob rau hauv npias ntau lawm, nws tuaj yeem siv ua npuas dej stabilizer rau npias, ua npuas ncauj nplua nuj thiab kav ntev thiab txhim kho saj.
CMC yog polyelectrolyte, uas tuaj yeem koom nrog ntau yam kev cuam tshuam hauv cawv los tswj qhov sib npaug ntawm lub cev cawv. Nyob rau tib lub sijhawm, nws kuj ua ke nrog cov crystals uas tau tsim, hloov cov qauv ntawm cov muaju, hloov cov xwm txheej ntawm cov muaju hauv cov cawv, thiab ua rau nag lossis daus. Aggregation ntawm yam.
Post lub sij hawm: Nov-07-2022