Focus on Cellulose ethers

Ukutya okongeziweyo kwe-sodium carboxymethyl cellulose

CMC ukusetyenziswa ekutyeni

I-sodium carboxymethyl cellulose (i-carboxymethyl cellulose, i-sodium CMC) yi-carboxymethylated derivative ye-cellulose, eyaziwa ngokuba yi-cellulose gum, kwaye yeyona gum ye-ionic cellulose ibalulekileyo.

I-CMC idla ngokuba yi-anionic polymer compound efunyenwe ngokusabela i-cellulose yendalo kunye ne-caustic alkali kunye ne-monochloroacetic acid. Ubunzima bemolekyuli bekhompawundi bususela kumawaka aliqela ukuya kwisigidi esinye. iqhina leyunithi yemolekyuli

I-CMC yeyokulungiswa kweselulosi yendalo. Okwangoku, i-Food and Agriculture Organisation yeZizwe eziManyeneyo (i-FAO) kunye ne-World Health Organization (WHO) ibize ngokusemthethweni ngokuthi "i-cellulose eguquliwe". Indlela yokudibanisa ye-sodium carboxymethyl cellulose yaqanjwa yi-German E.Jansen ngo-1918, kwaye yayinelungelo elilodwa lomenzi ngo-1921 kwaye yaziswa kwihlabathi, ukususela ngoko iye yathengiswa eYurophu.

I-CMC yayisetyenziselwa kuphela iimveliso ezikrwada, njenge-colloid kunye ne-binder. Ukususela ngo-1936 ukuya ku-1941, uphando lwesicelo soshishino lwe-sodium carboxymethyl cellulose lwalusebenza kakhulu, kwaye iipatent ezininzi ezikhanyisayo zapapashwa. Ngexesha leMfazwe yeHlabathi yesiBini, iJamani yasebenzisa i-CMC kwizicoci zokwenziwa njenge-ejenti yokuchasa ukuphinda-phinda, kwaye njengendawo yokuthatha indawo yeentsini zendalo (ezifana ne-gelatin, i-gum arabic), ishishini le-CMC liphuhliswe kakhulu.

I-CMC isetyenziswa kakhulu kwi-petroleum, kwi-geological , kwimichiza yemihla ngemihla, ukutya, amayeza kunye namanye amashishini, aziwa ngokuba yi "industrial monosodium glutamate".

01ICANDELO

Iipropati zesakhiwo se-CMC

I-CMC ngumgubo omhlophe okanye otyheli kancinane, i-granular okanye i-fibrous solid. Yikhemikhali ye-macromolecular ekwazi ukufunxa amanzi kwaye idumbe. Xa idumbile emanzini, inokwenza iglue ebonakalayo ebonakalayo. I-pH yokumiswa kwamanzi ngu-6.5-8.5. I-substance ayinyibiliki kwii-solvents eziphilayo ezifana ne-ethanol, i-ether, i-acetone kunye ne-chloroform.

I-CMC eqinile izinzile ekukhanyeni kunye nobushushu begumbi, kwaye inokugcinwa ixesha elide kwindawo eyomileyo. I-CMC luhlobo lwe-ether yeselulosi. Ngokuqhelekileyo yenziwe kwi-cotton linter emfutshane (i-cellulose umxholo ukuya kwi-98%) okanye i-pulp yomthi, ephathwa nge-sodium hydroxide kwaye iphendule nge-sodium monochloroacetate. Ubunzima bemolekyuli yekhompawundi yi-6400 (± 1000). Ngokuqhelekileyo kukho iindlela ezimbini zokulungiselela: indlela yamalahle-amanzi kunye nendlela yokunyibilikisa. Kukho nezinye iintsinga zezityalo ezisetyenziselwa ukwenza i-CMC.

02ICANDELO

Iimpawu kunye nezicelo

I-CMC ayisiyiyo kuphela i-emulsion stabilizer efanelekileyo kunye ne-thickener kwizicelo zokutya, kodwa inozinzo oluhle kakhulu lokukhenkceza kunye nokunyibilika, kwaye inokuphucula incasa yemveliso kunye nokwandisa ixesha lokugcina.

Ngo-1974, uMbutho woKutya kunye nezoLimo weZizwe eziManyeneyo (i-FAO) kunye noMbutho wezeMpilo weHlabathi (i-WHO) wavuma ukusetyenziswa kwe-CMC esulungekileyo yokutya emva kwezifundo kunye neemvavanyo ezinzima zebhayoloji kunye netyhefu. Umgangatho wamazwe ngamazwe wokuthathwa ngokukhuselekileyo (ADI) yi-25mg/kg ubunzima bomzimba/usuku.

2.1 Ukuqina kunye nokuqina kwe-emulsification

Ukutya i-CMC kunokudlala indima emulsification kunye nokuzinzisa iziselo eziqulethe ioli kunye neprotheni. Oku kungenxa yokuba i-CMC iba yi-colloid ezinzileyo ecacileyo emva kokuchithwa emanzini, kwaye i-protein particles ibe ngamasuntswana kunye nentlawulo efanayo phantsi kokhuseleko lwefilimu ye-colloid, enokwenza i-protein particles kwisimo esizinzileyo. Kwakhona kunomphumo othile we-emulsification, ngoko ke, kwangaxeshanye, kunokunciphisa ukunyanzeliswa komhlaba phakathi kwamafutha kunye namanzi, ukwenzela ukuba amanqatha abe emulsified ngokupheleleyo.

I-CMC inokuphucula ukuzinza kwemveliso kuba xa ixabiso le-pH lemveliso lisuka kwindawo ye-isoelectric yeprotheni, i-sodium carboxymethyl cellulose inokwenza isakhiwo esiyinkimbinkimbi kunye neprotheni, enokuphucula ukuzinza kwemveliso.

2.2 Ukwandisa ubukhulu

Ukusetyenziswa kwe-CMC kwi-ayisikrimu kunokunyusa ukwanda kwe-ayisikrimu, ukuphucula isantya sokunyibilika, ukunika imilo elungileyo kunye nencasa, kunye nokulawula ubungakanani kunye nokukhula kweekristale zomkhenkce ngexesha lokuthutha kunye nokugcinwa. Isixa-mali esisetyenzisiweyo yi-0.5% yetotali. Umlinganiselo wongezwa.

Oku kungenxa yokuba i-CMC inokugcinwa kakuhle kwamanzi kunye ne-dispersibility, kwaye idibanisa i-organic particles protein, i-globules yamafutha kunye ne-molecule zamanzi kwi-colloid ukwenza inkqubo efanayo kunye nezinzile.

2.3 I-Hydrophilicity kunye nokubuyisela amanzi emanzini

Le propati esebenzayo ye-CMC isetyenziswa ngokubanzi kwimveliso yesonka, enokwenza i-honeycomb iyunifomu, ikhulise umthamo, inciphise i-slag, kwaye ibe nefuthe lokugcina ukufudumala kunye nokutsha; i-noodles eyongeziweyo kunye ne-CMC inokugcinwa kakuhle kwamanzi, ukumelana nokupheka kunye nencasa elungileyo.

Oku kunqunywe yi-molecular structure ye-CMC, i-cellulose derivative kunye nenani elikhulu lamaqela e-hydrophilic kwi-chain chain: -OH iqela, iqela le-COONA, ngoko ke i-CMC ine-hydrophilicity engcono kune-cellulose kunye nomthamo wokubamba amanzi.

2.4 IGelation

Thixotropic CMC kuthetha ukuba imixokelelwane macromolecular inani elithile lonxibelelwano kwaye bathande ukwenza isakhiwo ezintathu-dimensional. Emva kokuba isakhiwo se-dimensional senziwe, i-viscosity yesisombululo iyanda, kwaye emva kokuba isakhiwo se-dimensional siphulwe, i-viscosity iyancipha. I-thixotropic phenomenon kukuba utshintsho olubonakalayo lwe-viscosity luxhomekeke kwixesha.

Thixotropic CMC idlala indima ebalulekileyo kwi-gelling system kwaye ingasetyenziselwa ukwenza i-jelly, i-jam kunye nokunye ukutya.

2.5 Inokusetyenziswa njenge-ejenti yokucacisa, i-foam stabilizer, yandisa i-taste

I-CMC ingasetyenziswa kwimveliso yewayini ukwenza incasa ibethambile kwaye ityebe, kwaye i-aftertaste inde; kwimveliso yebhiya, ingasetyenziswa njenge-foam stabilizer yebhiya, ukwenza i-foam ityebile kwaye ihlala njalo kwaye iphucule incasa.

I-CMC yi-polyelectrolyte, enokuthi ithathe inxaxheba kwiindlela ezahlukeneyo zewayini ukugcina ulungelelwano lomzimba wewayini. Ngelo xesha, iphinda idibanise kunye neekristali eziye zakha, ukuguqula isakhiwo se-crystals, ukuguqula iimeko zeekristali kwiwayini, kunye nokubangela imvula. Ukuhlanganiswa kwezinto.


Ixesha lokuposa: Nov-07-2022
Incoko ka-WhatsApp kwi-Intanethi!