Methylcellulose (MC) o se ituaiga o cellulose ether. Cellulose ether compounds o mea e maua mai i le fesuiaiga o vailaʻau o le cellulose masani, ma o le methylcellulose o se mea taua tele e maua mai i le methylating (methyl substitution) le vaega hydroxyl o le cellulose. O le mea lea, o le methylcellulose e le gata o se cellulose derivative, ae o se cellulose ether masani.
1. Sauniuniga o le methylcellulose
O le Methylcellulose e saunia e ala i le taliina o le cellulose ma se methylating agent (e pei o le methyl chloride poʻo le dimethyl sulfate) i lalo o tulaga alkaline e methylate le vaega hydroxyl o le cellulose. Ole tali lea e masani ona tupu ile vaega ole hydroxyl ile C2, C3 ma le C6 tulaga ole cellulose e fausia ai le methylcellulose ma tikeri eseese o suiga. Ole fa'agasologa ole tali e fa'apea:
Cellulose (o se polysaccharide e fausia i iunite kulukose) e muamua fa'agaoioia i lalo o tulaga alkaline;
Ona faʻafeiloaʻi ai lea o se methylating agent e faʻataʻitaʻiina se tali etherification e maua ai le methylcellulose.
O lenei metotia e mafai ona maua ai oloa methylcellulose ma viscosities eseese ma solubility meatotino e ala i le faatonutonuina o tulaga tali ma le tikeri o le methylation.
2. Meatotino o le methylcellulose
Methylcellulose o loʻo i ai mea taua nei:
Solubility: E le pei o le cellulose masani, methylcellulose e mafai ona faʻafefe i le vai malulu ae le o le vai vevela. E mafua ona o le faʻaofiina o methyl substituents e faʻaumatia ai le hydrogen bonds i le va o molelaʻau cellulose, ma faʻaitiitia ai lona tioata. Methylcellulose fai se vaifofo manino i totonu o le vai ma faʻaalia uiga gelation i le maualuga o le vevela, o lona uiga, o le fofo e mafiafia pe a vevela ma toe maua le sua pe a maeʻa le malulu.
Le o'ona: Methylcellulose e le o'ona ma e le mitiia e le tino o le tagata. O le mea lea, e masani ona faʻaaogaina i meaʻai ma vailaʻau faʻapipiʻi e pei o se mafiafia, emulsifier ma stabilizer.
Viscosity tulafono faatonutonu: Methylcellulose e lelei viscosity tulafono faatonutonu meatotino, ma o lona viscosity fofo e fesootai ma le faʻatonuga fofo ma le mamafa mole. E ala i le puleaina o le maualuga o le suitulaga i le etherification reaction, e mafai ona maua oloa methylcellulose ma laina viscosity eseese.
3. Fa'aaogāga ole methylcellulose
Ona o lona tulaga faʻapitoa faʻapitoa ma vailaʻau, methylcellulose ua faʻaaogaina lautele i le tele o alamanuia.
3.1 Alamanuia tau taumafa
Methylcellulose o se faʻaopoopoga meaʻai masani e faʻaaogaina i le tele o gaosiga o meaʻai, aemaise lava o se mafiafia, emulsifier ma stabilizer. Talu ai o le methylcellulose e mafai ona gel pe a vevela ma toe faʻafoʻi le suavai pe a maeʻa le malulu, e masani ona faʻaaogaina i meaʻai aisa, tao tao ma sou. E le gata i lea, o le natura maualalo-kalori o le methylcellulose ua avea ai ma mea taua i nisi o meaʻai maualalo-kalori.
3.2 Alamanuia tau vailaau ma vailaau faafomai
Methylcellulose o loʻo faʻaaogaina lautele i le falemaʻi vailaʻau, aemaise lava i le gaosiga o laulau, e avea o se mea faʻapitoa ma fusifusia. Ona o lona lelei fetuutuunai viscosity gafatia, e mafai ona faaleleia lelei le malosi faainisinia ma disintegration meatotino o papa. E le gata i lea, o le methylcellulose o loʻo faʻaaogaina foi e fai ma vaega o loimata i le ophthalmology e togafitia ai mata mago.
3.3 Alamanuia faufale ma meafaitino
Faatasi ai ma mea faufale, o le methylcellulose e masani ona faʻaaogaina i le sima, gypsum, faʻapipiʻi ma faʻapipiʻi e pei o se mafiafia, faʻamauina vai ma ata tifaga muamua. Ona o le lelei o le taofiofia o le vai, e mafai e le methylcellulose ona faʻaleleia le suavai ma le faʻaogaina o mea faufale ma aloese mai le faʻatupuina o taʻe ma gaogao.
3.4 Alamanuia mea teuteu
O le Methylcellulose e masani ona faʻaaogaina i totonu o fale gaosi oloa e avea o se mafiafia ma faʻamautu e fesoasoani e fausia ai emulsions ma gels umi. E mafai ona faʻaleleia le lagona o le oloa ma faʻaleleia ai le faʻasusu. E hypoallergenic ma agamalu, ma e talafeagai mo paʻu maʻaleʻale.
4. Fa'atusatusaga o le methylcellulose ma isi ethers cellulose
Cellulose ethers o se aiga tele. I le faaopoopo atu i le methylcellulose, o loʻo i ai foi le ethyl cellulose (EC), hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) ma isi ituaiga. O lo latou eseesega autu o loʻo taoto i le ituaiga ma le tikeri o le suitulaga o sui i luga o le cellulose mole, lea e fuafua ai lo latou solubility, viscosity ma nofoaga faʻaoga.
Methylcellulose vs Hydroxypropyl Methylcellulose (HPMC): HPMC o se faʻaleleia atili o le methylcellulose. I le faaopoopo atu i le methyl substituent, o le hydroxypropyl o loʻo faʻafeiloaʻi foi, lea e sili atu ona eseese le solubility o le HPMC. E mafai ona fa'amavaeina le HPMC i le lautele o le vevela, ma o lona vevela vevela e maualuga atu nai lo le methylcellulose. O le mea lea, i totonu o mea faufale ma fale talavai, HPMC o loʻo i ai le lautele lautele o talosaga.
Methylcellulose vs Ethyl Cellulose (EC): O le Ethyl cellulose e le mafai ona solu i le vai, ae mafai ona solu i solu faʻaletino. E masani ona faʻaaogaina i mea faʻapipiʻi faʻasaʻo mo le ufiufi ma vailaʻau. Methyl cellulose e solu i totonu o le vai malulu ma e masani ona faʻaaogaina e avea o se vailaʻau mafiafia ma vai. O ona vaega fa'aoga e ese mai i latou ole ethyl cellulose.
5. Atina'e tulaga o cellulose ethers
Faʻatasi ai ma le faʻateleina o le manaʻoga mo mea gafataulimaina ma vailaʻau lanumeamata, o le cellulose ether compounds, e aofia ai le methyl cellulose, ua faasolosolo malie lava ona avea ma vaega taua o mea e faʻaleleia le siosiomaga. E maua mai alava o la'au masani, e mafai ona fa'afouina, ma e mafai ona fa'aleagaina fa'alenatura i le si'osi'omaga. I le lumanaʻi, o le faʻaogaina o vaega ole cellulose ethers e mafai ona faʻalauteleina, e pei o le malosi fou, fale lanumeamata ma biomedicine.
I le avea ai o se ituaiga o cellulose ether, o le methyl cellulose e faʻaaogaina lautele i le tele o alamanuia ona o lona tulaga faʻapitoa faʻapitoa ma vailaʻau. E le gata ina lelei solubility, non-toxicity, ma viscosity fetuutuunai lelei gafatia, ae o loʻo i ai foi se sao taua i meaai, vailaʻau, fausiaina ma cosmetics. I le lumanaʻi, faʻatasi ai ma le faʻateleina o le manaʻoga mo mea faʻaleleia le siosiomaga, o le faʻamoemoega ole talosaga ole methyl cellulose o le a lautele.
Taimi meli: Oke-23-2024