HPMC (Hydroxypropyl Methylcellulose) bụ polima polysaccharide semi-synthetic a na-ejikarị eme ihe n'ọgwụ, nri, ụlọ ọrụ kemịkalụ na ngalaba ndị ọzọ. Àgwà mgbaze ya bụ otu n'ime ihe ndị a na-ahụkarị na nyocha na itinye ya n'ọrụ.
1. Ọdịdị na njirimara nke molekụla nke HPMC
HPMC bụ ngwakọta polima na-agbaze mmiri nke a na-enweta site na mgbanwe etherification nke cellulose. Akụkụ nhazi ya bụ β-D-glucose, nke ejikọtara site na njikọ 1,4-glycosidic. Isi nhazi yinye nke HPMC sitere na cellulose eke, mana akụkụ nke otu hydroxyl ya ka ejiri otu methoxy (-OCH₃) na otu hydroxypropyl (-CH₂CH(OH)CH₃ dochie, ya mere ọ na-egosipụta omume mgbaze dị iche na nke cellulose eke.
Nhazi molekul nke HPMC nwere mmetụta dị ukwuu na ike ya ịgbaze. Ogo nke nnọchi (DS, Degree of Substitution) na mgbanwe molar (MS, Molar Substitution) nke HPMC bụ paramita dị mkpa nke na-ekpebi njirimara ike ya ịgbaze. Ka ogo nke nnọchi dị elu, ka a na-eji hydrophobic methoxy ma ọ bụ hydroxypropyl groups dochie ọtụtụ hydroxyl na molekul, nke na-eme ka ike HPMC na-agbaze na ihe mgbaze organic ma na-ebelata ike ịgbaze na mmiri. N'ụzọ megidere nke ahụ, mgbe ogo nke nnọchi dị ala, HPMC na-eme ka mmiri dịkwuo mmiri na mmiri, ọnụego ike ịgbaze ya na-agbakwa ngwa ngwa.
2. Usoro mgbaze nke HPMC
Mmiri nke HPMC na mmiri bụ usoro anụ ahụ na kemịkalụ dị mgbagwoju anya, usoro mgbaze ya gụnyere usoro ndị a:
Ọkwa mmiri mmiri: Mgbe HPMC metụrụ mmiri aka, molekul mmiri ga-ebu ụzọ mepụta ihe nkiri mmiri mmiri n'elu HPMC iji kechie ihe ndị HPMC. N'ime usoro a, molekul mmiri na-akpakọrịta na otu hydroxyl na methoxy dị na molekul HPMC site na njikọ hydrogen, na-eme ka molekul HPMC jiri nwayọọ nwayọọ na-amị mmiri.
Ọkwa Mmụba: Ka mkpụrụ ndụ mmiri na-abanye, mkpụrụ ndụ HPMC na-amalite ịmịkọrọ mmiri ma na-aza, olu ya na-abawanye, agbụ ígwè ndị ahụ na-ebelatakwa nwayọọ nwayọọ. Ike mmụba nke HPMC na-emetụta site na ibu molekul na ihe ndị ọzọ ya. Ka ibu molekul buru ibu, otú ahụ ka oge mmụba ahụ na-adị ogologo; ka mmiri nke ihe ndị ọzọ si sie ike, otú ahụ ka oke mmụba ahụ na-amụba.
Usoro mgbaze: Mgbe molekul HPMC na-amịkọrọ mmiri zuru oke, agbụ molekul na-amalite ịpụpụ na ihe ndị ahụ ma jiri nwayọọ nwayọọ gbasaa na mmiri ahụ. Ihe ndị dị ka okpomọkụ, ọsọ mkpali na ihe ndị na-agbaze na-emetụta ọsọ nke usoro a.
HPMC na-egosikarị na mmiri nwere ike ịgbaze nke ọma, ọkachasị n'ọnọdụ okpomọkụ ụlọ. Agbanyeghị, ọ dị mkpa ịmara na mgbe okpomọkụ ahụ ruru ọkwa ụfọdụ, HPMC ga-egosipụta ihe "gel okpomọkụ", ya bụ, ịgbaze ahụ na-ebelata ka okpomọkụ ahụ na-arị elu. Nke a bụ n'ihi mmegharị nke molekul mmiri na-aga n'ihu na oke okpomọkụ na mmekọrịta hydrophobic dị elu n'etiti molekul HPMC, na-eduga na njikọ intermolecular na ịmepụta nhazi gel.
3. Ihe ndị na-emetụta ike ịgbaze nke HPMC
Ọtụtụ ihe na-emetụta otú HPMC si agbaze, gụnyere àgwà anụ ahụ na nke kemịkalụ ya na ọnọdụ mpụga ya. Isi ihe ndị a gụnyere:
Ọkwa nnọchi: Dịka ekwuru n'elu, ụdị na ọnụọgụ nke ihe ndị na-anọchi HPMC na-emetụta kpọmkwem ike ịgbaze ya. Ka ihe ndị na-anọchi ya na-abawanye, otú ahụ ka obere ìgwè hydrophilic dị na molekul ahụ na-ebelata ike ịgbaze ya, otú ahụ ka ike ịgbaze ya na-aka njọ. N'ụzọ megidere nke ahụ, mgbe e nwere obere ihe ndị na-anọchi ya, ike ịgbaze nke HPMC na-abawanye ma ike ịgbaze ya ka mma.
Ibu molekul: Ibu molekul nke HPMC dabere kpọmkwem na oge mgbaze ya. Ka ibu molekul buru ibu, otú ahụ ka usoro mgbaze ahụ si dị nwayọ. Nke a bụ n'ihi na agbụ molekul nke HPMC nwere nnukwu ibu molekul na-adị ogologo karịa, molekul ndị ahụ na-ekekọtakwa nke ọma, na-eme ka ọ sie ike maka molekul mmiri ịbanye, na-eme ka ọ na-esi ike ịba n'ime, na-eme ka ọ na-afụ nwayọ nwayọ ma na-agbaze ọsọ ọsọ.
Okpomọkụ ngwọta: Okpomọkụ bụ otu n'ime ihe ndị dị mkpa na-emetụta ike ịgbaze nke HPMC. HPMC na-agbaze ngwa ngwa na obere okpomọkụ, ebe n'okpomọkụ dị elu, ọ nwere ike ịmepụta jel ma belata ike ịgbaze ya. Ya mere, a na-akwadebe HPMC na mmiri dị ala iji zere ịgbaze na oke okpomọkụ.
Ụdị ihe mgbaze: HPMC anaghị agbaze naanị na mmiri, kamakwa ọ na-agbaze na ụfọdụ ihe mgbaze organic, dịka ethanol, isopropyl alcohol, wdg. Ịgbaze na ihe mgbaze organic dabere na ụdị na nkesa nke ihe mgbakwunye. N'ọnọdụ nkịtị, HPMC enweghị ike ịgbaze na ihe mgbaze organic, a ga-agbakwunyekwa mmiri kwesịrị ekwesị iji nyere aka ịgbaze.
Uru pH: HPMC nwere ike ịnagide uru pH nke ngwọta ahụ, mana n'okpuru oke acid na alkali, ike ịgbaze nke HPMC ga-emetụta. N'ozuzu, HPMC nwere ike ịgbaze nke ọma na oke pH nke 3 ruo 11.
4. Ngwa nke HPMC n'ọhịa dị iche iche
Mmiri nke HPMC na-eme ka ọ baa uru n'ọtụtụ ubi:
Ngalaba ọgwụ: A na-ejikarị HPMC eme ihe dị ka ihe mkpuchi, ihe mmado na ihe ndị na-adịgide adịgide maka mbadamba ọgwụ. N'ime mkpuchi ọgwụ, HPMC nwere ike ịmepụta otu ihe mkpuchi iji melite nkwụsi ike nke ọgwụ ahụ; na usoro ntọhapụ na-adịgide adịgide, HPMC na-achịkwa ọnụego ntọhapụ nke ọgwụ ahụ site na ijikwa ọnụego mgbasa ya, si otú a na-enweta nnyefe ọgwụ na-adịgide adịgide.
Ụlọ ọrụ nri: N'ihe gbasara nri, a na-eji HPMC eme ihe dị ka ihe na-eme ka ihe sie ike, ihe na-eme ka ihe sie ike, na ihe na-eme ka ihe sie ike. Ebe ọ bụ na HPMC nwere ezigbo mmiri na-agbaze ma na-eme ka okpomọkụ sie ike, ọ nwere ike inye ụdị nri dị iche iche udidi na ụtọ kwesịrị ekwesị. N'otu oge ahụ, ọdịdị nke HPMC na-anaghị ekwe ka ọ meghachi omume na ihe ndị ọzọ e ji eme nri ma na-eme ka nri kwụsie ike na nke kemịkalụ.
Ụlọ ọrụ kemịkalụ kwa ụbọchị: A na-ejikarị HPMC eme ihe dị ka ihe na-eme ka ihe sie ike ma na-eme ka ihe dị nro na ihe na-eme ka ihe dị nro na-eme ka ihe dị nro na ngwaahịa dịka shampoo, conditioner na ude ihu. Ọ na-agbaze nke ọma na mmiri na mmetụta ya na-eme ka ọ dị nro na-eme ka o nwee ahụmịhe ojiji dị mma. Na mgbakwunye, HPMC nwere ike ijikọ ya na ihe ndị ọzọ na-arụ ọrụ iji mee ka ọrụ nke ngwaahịa ahụ ka mma.
Ihe eji arụ ụlọ: N'ụlọ ọrụ owuwu ụlọ, a na-eji HPMC eme ihe dị ka ihe na-eme ka ihe sie ike ma na-ejide mmiri n'ime simenti, ihe na-eme ka taịlị na ihe mkpuchi dị n'ime ụlọ. HPMC nwere ike ime ka ihe ndị a dịkwuo mma, mee ka oge ha ji arụ ọrụ dịkwuo elu, ma melite iguzogide mgbawa ha.
Dịka ihe polymer nwere ezigbo mgbaze, ọtụtụ ihe na-emetụta omume mgbaze nke HPMC, dịka nhazi molekul, okpomọkụ, uru pH, wdg. N'ebe dị iche iche e ji eme ihe, enwere ike ime ka mgbaze nke HPMC ka mma site n'ịgbanwe ihe ndị a ka ha wee gboo mkpa dị iche iche. Mgbaze nke HPMC abụghị naanị na ọ na-ekpebi arụmọrụ ya na mmiri mmiri, kamakwa ọ na-emetụta ọrụ ya kpọmkwem na ụlọ ọrụ ọgwụ, nri, kemịkalụ kwa ụbọchị na ụlọ ọrụ owuwu.
Oge ozi: Ọktoba-14-2024