1.Hydroxypropyl methylcellulose (HPMC)waa eter cellulose oo muhiim ah, oo si weyn loogu isticmaalo dhismaha, daawooyinka, cuntada, qurxinta iyo beeraha kale. HPMC waxay leedahay dhumuc wanaagsan, filim samaynta, emulsifying, hakinta iyo guryaha haynta biyaha, marka waxay door muhiim ah ka ciyaartaa warshado badan. Soo saarista HPMC waxay inta badan ku tiirsan tahay hababka wax ka beddelka kiimikada. Sanadihii la soo dhaafay, iyada oo horumarinta bayolojiyada, hababka wax soo saarka ee ku salaysan halsano microbial ayaa sidoo kale bilaabay in ay soo jiitaan dareenka.
2. Mabda'a wax soo saarka halsano ee HPMC
Habka wax soo saarka HPMC ee soo jireenka ah waxa uu isticmaalaa cellulose dabiici ah walxo ceeriin ah waxaana lagu soo saaraa hababka kiimikada sida alkalization, etherification iyo sifeynta. Si kastaba ha ahaatee, habkani waxa uu ku lug leeyahay xaddi badan oo dareere organic iyo reagents kiimikaad, taas oo saameyn weyn ku leh deegaanka. Sidaa darteed, isticmaalka halsano microbial in synthesize cellulose iyo sii etherify waxa ay noqotay hab wax soo saarka more deegaanka saaxiibtinimo iyo waara.
Isku-dhafka microbial ee cellulose (BC) ayaa ahaa mawduuc aad u kulul sanadihii ugu dambeeyay. Bakteeriyada ay ku jiraan Komagataeibacter (sida Komagataeibacter xylinus) iyo Gluconacetobacter waxay si toos ah u soo saari karaan cellulose nadiif ah oo nadiif ah iyada oo loo marayo halsano. Bakteeriyadani waxay isticmaashaa gulukoos, glycerol ama ilo kale oo kaarboon ahaan sida substrates, waxay ku khamiiraan xaaladaha ku habboon, waxayna siidaayaan nanofibers cellulose. Bakteeriyada cellulose ee ka dhalata waxa loo rogi karaa HPMC ka dib beddelka hydroxypropyl iyo methylation.
3. Habka wax soo saarka
3.1 Habka halsano ee cellulose bakteeriyada
Hagaajinta habka halsano ayaa muhiim u ah hagaajinta wax soo saarka iyo tayada cellulose bakteeriyada. Talaabooyinka ugu muhiimsan waa sida soo socota:
Baadhitaanka cadaadiska iyo beerista: Dooro noocyada cellulose-ka wax-soo-saarka sare leh, sida Komagataeibacter xylinus, looguna talagalay guri-guritaan iyo hagaajin.
Dhexdhexaadinta halsano: Bixi ilaha kaarboonka (glucose, sucrose, xylose), ilaha nitrogen (soosaarka khamiirka, peptone), cusbada aan organic ahayn (phosphates, cusbada magnesium, iwm.) iyo nidaamiyayaal (acetic acid, citric acid) si kor loogu qaado koritaanka bakteeriyada iyo isku-dhafka cellulose.
Xakamaynta xaaladda halsano: oo ay ku jiraan heerkulka (28-30 ℃), pH (4.5-6.0), heerka oksijiinta kala diri (kicinta ama dhaqanka taagan), iwm.
Ururinta iyo nadiifinta: Halsano ka dib, bakteeriyada cellulose-ka waxaa lagu soo ururiyaa iyadoo la sifeynayo, dhaqid, qalajin iyo tallaabooyin kale, iyo bakteeriyada hadhaaga ah iyo wasakhda kale waa la saaraa.
3.2 Hydroxypropyl methylation modification of cellulose
Cellulose-ka bakteeriyada ee la helay wuxuu u baahan yahay in kiimiko ahaan wax laga beddelo si loo siiyo sifooyinka HPMC. Talaabooyinka ugu muhiimsan waa sida soo socota:
Daawaynta Alkalinization: Ku qooy qadar ku habboon xalalka NaOH si loo ballaariyo silsiladda cellulose oo loo hagaajiyo waxqabadka falcelinta ee etherification xiga.
Dareen-celinta Etherification: heerkulka gaarka ah iyo xaaladaha catalytic, ku dar propylene oxide (hydroxypropylation) iyo methyl chloride (methylation) si aad u bedesho kooxda hydroxyl cellulose si loo sameeyo HPMC.
Dhexdhexaadinta iyo sifayn: ku dhex-dhexaad aashitada ka dib falcelinta si aad meesha uga saarto reagents kiimiko ah oo aan falcelin, oo aad hesho badeecada ugu dambaysa adigoo dhaqay, shaandhayn iyo qalajin.
Burburinta iyo darajaynta: Burburi HPMC qaybo buuxiya tilmaamaha, oo baadh oo xidhi iyaga oo raacaya darajooyinka viscosity ee kala duwan.
4. Farsamooyinka muhiimka ah iyo xeeladaha hagaajinta
Wanaajinta cadaadiska: hagaajinta wax-soo-saarka cellulose iyo tayada iyada oo loo marayo injineernimada hidaha ee noocyada microbial.
Hagaajinta habka halsano: u isticmaal bioreactor si loo xakameeyo firfircoonida si loo hagaajiyo waxtarka wax soo saarka cellulose.
Geedi socodka etherification Cagaaran: la yareeyo isticmaalka dareerayaasha organic iyo horumarinta technology etherification dheeraad ah deegaanka saaxiibtinimo, sida wax ka beddelka katalytic enzyme.
Xakamaynta tayada badeecada: iyadoo la falanqeynayo heerka beddelka, milanka, viscosity iyo tilmaamayaasha kale ee HPMC, hubi inay buuxisay shuruudaha codsiga.
Halsano ku salaysanHPMCHabka wax-soo-saarka ayaa leh faa'iidooyinka la cusbooneysiin karo, deegaanka saaxiibtinimo iyo waxtar leh, taas oo la socota isbeddelka kimisteriga cagaaran iyo horumarinta waara. Horumarinta cilmiga bayoolajiga, tignoolajiyadan ayaa la filayaa inay si tartiib tartiib ah u bedesho hababka kiimikaad ee dhaqanka iyo kor u qaadida codsiga ballaaran ee HPMC ee dhinacyada dhismaha, cuntada, daawada, iwm.
Waqtiga boostada: Apr-11-2025