Methylcellulose (MC) wani nau'in ether ne na cellulose. Cellulose ether mahadi sune abubuwan da aka samo ta hanyar gyare-gyaren sinadarai na cellulose na halitta, kuma methylcellulose wani muhimmin abu ne na cellulose wanda aka kafa ta hanyar methylating (musanya methyl) ɓangaren hydroxyl na cellulose. Saboda haka, methylcellulose ba kawai abin da aka samu na cellulose ba ne, amma har ma da ether cellulose.
1. Shiri na methylcellulose
Methylcellulose an shirya shi ta hanyar mayar da martani ga cellulose tare da wakili na methylating (kamar methyl chloride ko dimethyl sulfate) a ƙarƙashin yanayin alkaline don methylate na hydroxyl na cellulose. Wannan halayen yana faruwa ne akan ƙungiyoyin hydroxyl a matsayi na C2, C3 da C6 na cellulose don samar da methylcellulose tare da digiri daban-daban na maye gurbin. Tsarin dauki shine kamar haka:
Cellulose (polysaccharide wanda ya ƙunshi raka'a glucose) an fara kunna shi a ƙarƙashin yanayin alkaline;
Sa'an nan kuma an gabatar da wani wakili na methylating don yin maganin etherification don samun methylcellulose.
Wannan hanyar na iya samar da samfuran methylcellulose tare da danko daban-daban da kaddarorin solubility ta hanyar daidaita yanayin halayen da matakin methylation.
2. Abubuwan da ke cikin methylcellulose
Methylcellulose yana da manyan kaddarorin masu zuwa:
Solubility: Ba kamar cellulose na halitta ba, ana iya narkar da methylcellulose a cikin ruwan sanyi amma ba cikin ruwan zafi ba. Wannan shi ne saboda gabatarwar abubuwan maye gurbin methyl yana lalata haɗin gwiwar hydrogen tsakanin kwayoyin cellulose, don haka rage crystallinity. Methylcellulose yana samar da bayani mai haske a cikin ruwa kuma yana nuna halayen gelation a yanayin zafi mai yawa, wato, maganin yana yin kauri lokacin da mai tsanani kuma ya dawo da ruwa bayan sanyaya.
Rashin guba: Methylcellulose ba mai guba ba ne kuma tsarin narkewar ɗan adam ba ya shafe shi. Sabili da haka, ana amfani dashi sau da yawa a cikin abinci da ƙari na magunguna azaman thickener, emulsifier da stabilizer.
Tsarin danko: Methylcellulose yana da kyawawan kaddarorin ka'idojin danko, kuma dankon maganin sa yana da alaƙa da tattarawar bayani da nauyin kwayoyin. Ta hanyar sarrafa matakin maye gurbin a cikin amsawar etherification, ana iya samun samfuran methylcellulose tare da jeri daban-daban na danko.
3. Amfani da methylcellulose
Saboda kaddarorinsa na zahiri da sinadarai na musamman, an yi amfani da methylcellulose sosai a masana'antu da yawa.
3.1 Masana'antar Abinci
Methylcellulose ƙari ne na abinci na yau da kullun da ake amfani dashi a cikin sarrafa abinci iri-iri, galibi azaman mai kauri, emulsifier da stabilizer. Tun da methylcellulose zai iya yin gel lokacin zafi da mayar da ruwa bayan sanyaya, ana amfani dashi sau da yawa a cikin daskararre abinci, kayan gasa da miya. Bugu da ƙari, yanayin ƙarancin kalori na methylcellulose ya sa ya zama wani abu mai mahimmanci a cikin wasu tsarin abinci mai ƙarancin kalori.
3.2 Masana'antar harhada magunguna da magunguna
Methylcellulose ana amfani dashi sosai a cikin masana'antar harhada magunguna, musamman a cikin samar da kwamfutar hannu, azaman mai haɓakawa da ɗaure. Saboda kyakkyawan ikon daidaitawar danko, zai iya inganta ƙarfin injina da rarrabuwar kaddarorin allunan. Bugu da kari, ana kuma amfani da methylcellulose azaman bangaren hawaye na wucin gadi a cikin ilimin ido don magance bushewar idanu.
3.3 Gine-gine da masana'antu
Daga cikin kayan gini, ana amfani da methylcellulose sosai a cikin siminti, gypsum, sutura da adhesives azaman mai kauri, mai riƙe ruwa da tsohon fim. Saboda kyakkyawar riƙewar ruwa, methylcellulose na iya inganta haɓakar ruwa da aiki na kayan gini kuma ya guje wa haɓakar fasa da ɓoyayyiya.
3.4 Masana'antar kwaskwarima
Methylcellulose kuma ana amfani dashi a cikin masana'antar kwaskwarima a matsayin mai kauri da daidaitawa don taimakawa samar da emulsion da gels masu dorewa. Zai iya inganta jin daɗin samfurin kuma yana haɓaka tasirin moisturizing. Yana da hypoallergenic kuma mai laushi, kuma ya dace da fata mai laushi.
4. Kwatanta methylcellulose tare da sauran ethers cellulose
Cellulose ethers babban iyali ne. Baya ga methylcellulose, akwai kuma ethyl cellulose (EC), hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) da sauran nau'ikan. Babban bambancin su ya ta'allaka ne a cikin nau'in da digiri na maye gurbin masu maye a kan kwayoyin cellulose, wanda ke ƙayyade solubility, danko da wuraren aikace-aikace.
Methylcellulose vs Hydroxypropyl Methylcellulose (HPMC): HPMC shine ingantaccen sigar methylcellulose. Baya ga maye gurbin methyl, ana kuma gabatar da hydroxypropyl, wanda ke sa solubility na HPMC ya bambanta. Ana iya narkar da HPMC a cikin kewayon zafin jiki mai faɗi, kuma zafin gelation ɗin sa na thermal ya fi na methylcellulose girma. Saboda haka, a cikin kayan gini da masana'antar harhada magunguna, HPMC yana da fa'idar aikace-aikace.
Methylcellulose vs Ethyl Cellulose (EC): Ethyl cellulose baya narkewa a cikin ruwa, amma mai narkewa a cikin kaushi na halitta. Ana amfani da shi sau da yawa a cikin abubuwan da aka ɗorewa na membrane don sutura da magunguna. Methyl cellulose yana narkewa a cikin ruwan sanyi kuma ana amfani dashi da yawa azaman mai kauri da mai riƙe ruwa. Yankunan aikace-aikacen sa sun bambanta da na ethyl cellulose.
5. Ci gaban haɓakar ethers cellulose
Tare da karuwar buƙatun kayan ɗorewa da sinadarai masu kore, mahaɗan ether cellulose, gami da methyl cellulose, sannu a hankali suna zama muhimmin ɓangaren kayan da ke da alaƙa da muhalli. An samo shi daga filayen tsire-tsire na halitta, ana iya sabuntawa, kuma ana iya lalacewa ta halitta a cikin yanayi. A nan gaba, ana iya ƙara fadada wuraren aikace-aikacen ethers cellulose, kamar a cikin sabon makamashi, gine-ginen kore da biomedicine.
A matsayin nau'in ether cellulose, methyl cellulose ana amfani dashi sosai a masana'antu da yawa saboda abubuwan da ke cikin jiki da sinadarai na musamman. Ba wai kawai yana da kyawawa mai kyau ba, rashin guba, da kuma ikon daidaita yanayin danko, amma kuma yana taka muhimmiyar rawa a cikin abinci, magani, gini da kayan shafawa. A nan gaba, tare da karuwar bukatar kayan da ke da alaƙa da muhalli, abubuwan da ake buƙata na methyl cellulose za su fi girma.
Lokacin aikawa: Oktoba-23-2024