gabatar da
Cellulose ethers polymers ne masu narkewa cikin ruwa na anionic da aka samo daga cellulose. Waɗannan polymers suna da amfani da yawa a masana'antu daban-daban kamar abinci, magunguna, kayan kwalliya, da gini saboda kaddarorinsu kamar kauri, gelling, samar da fim, da emulsifying. Ɗaya daga cikin mahimman kaddarorin cellulose ethers shine zafin gelation na thermal (Tg), zafin jiki wanda polymer ke fuskantar sauyi daga sol zuwa gel. Wannan kadara tana da mahimmanci wajen tantance aikin cellulose ethers a aikace-aikace daban-daban. A cikin wannan labarin, mun tattauna zafin gelation na thermal na hydroxypropyl methylcellulose (HPMC), ɗaya daga cikin cellulose ethers da aka fi amfani da su a masana'antar.
Zafin zafin jiki na thermal na HPMC
HPMC wani sinadari ne mai kama da sinadari wanda ake amfani da shi sosai a aikace-aikace daban-daban saboda keɓancewarsa ta musamman. HPMC yana narkewa sosai a cikin ruwa, yana samar da mafita mai haske a ƙananan yawa. A mafi yawan yawa, HPMC yana samar da gels waɗanda za a iya juyawa bayan dumama da sanyaya. Gel ɗin zafi na HPMC tsari ne na matakai biyu wanda ya haɗa da ƙirƙirar micelles sannan a haɗa micelles don samar da hanyar sadarwa ta gel (Hoto na 1).
Zafin zafin gelation na zafi na HPMC ya dogara da abubuwa da yawa kamar matakin maye gurbin (DS), nauyin kwayoyin halitta, yawan maida hankali, da pH na maganin. Gabaɗaya, mafi girman DS da nauyin kwayoyin halitta na HPMC, mafi girman zafin gelation na zafi. Yawan HPMC a cikin maganin shima yana shafar Tg, mafi girman maida hankali, mafi girman Tg. pH na maganin shima yana shafar Tg, tare da ruwan acidic wanda ke haifar da ƙarancin Tg.
Gel ɗin zafi na HPMC yana iya canzawa kuma yana iya shafar abubuwa daban-daban na waje kamar ƙarfin yankewa, zafin jiki, da yawan gishiri. Shear yana karya tsarin gel kuma yana rage Tg, yayin da ƙaruwar zafin jiki ke sa gel ɗin ya narke kuma ya rage Tg. Ƙara gishiri a cikin maganin shima yana shafar Tg, kuma kasancewar cations kamar calcium da magnesium yana ƙara Tg.
Aikace-aikace na daban-daban Tg HPMC
Ana iya tsara yanayin zafi na HPMC don aikace-aikace daban-daban. Ana amfani da ƙananan ƙwayoyin HPMC a aikace-aikace da ke buƙatar saurin shafawa, kamar kayan zaki nan take, miya da miyar miya. Ana amfani da HPMC mai yawan Tg a aikace-aikace da ke buƙatar jinkirin shafawa ko tsawaitawa, kamar ƙirƙirar tsarin isar da magunguna, allunan saki mai ɗorewa, da kuma miyar raunuka.
A masana'antar abinci, ana amfani da HPMC a matsayin mai kauri, mai daidaita jiki da kuma wakili mai narkewar abinci. Ana amfani da HPMC mai ƙarancin Tg a cikin kayan zaki nan take waɗanda ke buƙatar saurin narkewa don samar da yanayin da ake so da kuma jin daɗin baki. Ana amfani da HPMC mai yawan Tg a cikin kayan miya masu ƙarancin kitse inda ake son jinkirin narkewa ko tsawaitawa don hana haɗuwa da kuma kula da tsarin yaduwa.
A masana'antar magunguna, ana amfani da HPMC a matsayin maganin ɗaurewa, wargazawa da kuma mai dorewa. Ana amfani da HPMC mai babban Tg wajen samar da ƙwayoyin da za a saki na tsawon lokaci, inda ake buƙatar jinkirtawa ko tsawaita gel don sakin maganin na tsawon lokaci. Ana amfani da ƙananan Tg HPMC wajen samar da ƙwayoyin da za su wargaza baki, inda ake buƙatar wargazawa da kuma gelation cikin sauri don samar da jin daɗin baki da sauƙin haɗiya.
a ƙarshe
Zafin zafin gelation na zafi na HPMC muhimmin abu ne wanda ke tantance halayensa a aikace-aikace daban-daban. HPMC na iya daidaita Tg ɗinsa ta hanyar matakin maye gurbinsa, nauyin kwayoyin halitta, yawan maida hankali da ƙimar pH na maganin don dacewa da aikace-aikace daban-daban. Ana amfani da HPMC mai ƙarancin Tg don aikace-aikacen da ke buƙatar gelation mai sauri, yayin da HPMC mai babban Tg ana amfani da shi don aikace-aikacen da ke buƙatar gelation mai jinkiri ko na dogon lokaci. HPMC wani abu ne mai amfani da cellulose ether mai amfani da yawa tare da aikace-aikace da yawa masu yuwuwa a masana'antu daban-daban.
Lokacin Saƙo: Agusta-24-2023