Lekwasị anya na cellulose ethers

Kedu ihe bụ pH nke HPMC?

HPMC (Hydroxypropyl Methylcellulose, hydroxypropyl methylcellulose) bụ polymer soluble mmiri nke a na-ejikarị na ụlọ ọrụ ọgwụ, nri na ịchọ mma. A na-ejikarị ya dị ka onye na-agba ume, stabilizer, emulsifier, onye na-emepụta ihe nkiri na onye na-ahụ maka njikwa. Wepụta ihe. Isi ihe ya bụ na ọ nwere ike ịmepụta ihe ngwọta na-egbuke egbuke na mmiri ma nwee ezigbo ihe na-eme ka ọ dịkwuo mma na nrapado.

pH uru nke HPMC
HPMC n'onwe ya enweghị uru pH edobere n'ihi na ọ bụ ihe na-anọpụ iche ma ọ bụ obere acidic polymer. HPMC bụ ihe nrụpụta nonionic cellulose, yabụ na ọ naghị agbanwe pH nke ngwọta. Mgbe agbazere n'ime mmiri, pH nke ngwọta na-adaberekarị na pH nke ihe mgbaze n'onwe ya kama njirimara kemịkalụ nke ihe HPMC n'onwe ya.

N'ozuzu, pH nke ngwọta HPMC ga-adịgasị iche dabere na ihe mgbaze. Dịka, pH nke ngwọta HPMC na mmiri dị ọcha dị ihe dịka 6.0 na 8.0. Ogo mmiri sitere na isi mmalite dị iche iche, yana ọkwa viscosity dị iche iche nke HPMC, nwere ike imetụta pH nke ngwọta ikpeazụ. Ọ bụrụ na ọ dị mkpa iji ngwọta HPMC n'ime otu pH dị iche iche, enwere ike imezi nke a site n'ịgbakwụnye buffers n'oge usoro nhazi.

Mmetụta anụ ahụ na kemịkal nke HPMC na pH
Ebe ọ bụ na HPMC bụ ihe na-abụghị ionic ma ọ nweghị ndị na-akpachapụ anya na ụmụ irighiri ihe ya, ọ naghị emetụta pH nke ngwọta dị ka ụfọdụ polymers cationic ma ọ bụ anionic. Omume HPMC na ngwọta na-emetụtakarị ihe ndị dị ka okpomọkụ, itinye uche na ike ionic.

Viscosity na ngwọta kwụsie ike: Otu isi oke nke HPMC bụ viscosity ya, ịdị arọ ya nke na-ekpebi ka o si akpa àgwà na ngwọta. The pH nke a obere viscosity HPMC ngwọta nwere ike ịbịaru nso na pH mmiri n'onwe ya (na-emekarị gburugburu 7.0), mgbe a elu viscosity HPMC ngwọta nwere ike na-emekarị ka ubé ọzọ acidic ma ọ bụ alkaline, dabere na ọnụnọ nke adịghị ọcha ma ọ bụ ndị ọzọ mgbakwunye. na ngwọta. .

Mmetụta okpomọkụ: Viscosity nke ngwọta HPMC na-agbanwe na okpomọkụ. Mgbe okpomọkụ na-abawanye, solubility nke HPMC na-abawanye na viscosity na-ebelata. Mgbanwe a anaghị emetụta kpọmkwem pH nke ngwọta, ma ọ nwere ike ịgbanwe mmiri na udidi nke ngwọta.

Ndozi pH na ndapụta ngwa
N'ime ụfọdụ ngwa pụrụ iche, dị ka sistemụ ntọhapụ a na-achịkwa maka ọgwụ ma ọ bụ ihe mgbakwunye nri, enwere ike ịnwe ihe achọrọ maka pH. N'okwu ndị a, enwere ike gbanwee pH nke ngwọta HPMC site na ịgbakwunye acid, base, ma ọ bụ ihe nchekwa. Dịka ọmụmaatụ, enwere ike iji citric acid, phosphate buffer, wdg iji dozie pH nke ngwọta HPMC iji hụ na nkwụsi ike na ịdị irè nke ngwaahịa ikpeazụ.

Maka ngwa HPMC na usoro ọgwụ, njikwa pH dị mkpa karịsịa n'ihi na mgbasa na ntọhapụ nke ọgwụ na-adaberekarị na pH nke gburugburu ebe obibi. Ọdịdị na-abụghị ionic nke HPMC na-eme ka ọ gosipụta nkwụsi ike kemịkalụ dị mma na gburugburu ebe nwere ụkpụrụ pH dị iche iche, na-eme ka ọ dị mma maka iji ya na mbadamba ọnụ, capsules, nkwadebe anya na ọgwụ ọgwụ.

Uru pH nke HPMC n'onwe ya enweghị uru a kapịrị ọnụ. Ya pH na-adabere karịa na ihe mgbaze na ngwọta usoro eji. Dịka, pH nke ngwọta HPMC na mmiri sitere na 6.0 ruo 8.0. Na ngwa bara uru, ọ bụrụ na ọ dị mkpa ka edozie pH nke ngwọta HPMC, enwere ike ịhazi ya site na ịgbakwunye ihe nchekwa ma ọ bụ ngwọta acid-base.


Oge nzipu: Ọktoba 18-2024
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