Ka hopena o ka ʻike hydroxypropyl ma ka mahana o ka gel HPMC

ʻO ka Hydroxypropyl methylcellulose (HPMC) he polymer wai-soluble i hoʻohana pinepine ʻia, hoʻohana nui ʻia i nā lāʻau lapaʻau, nā mea hoʻonani, nā meaʻai a me nā ʻoihana ʻoihana, ʻoi aku hoʻi i ka hoʻomākaukau ʻana i nā gels. ʻO kona mau waiwai kino a me ke ʻano hoʻoheheʻe ʻana he hopena koʻikoʻi i ka pono ma nā noi like ʻole. ʻO ka mahana gelation o ka HPMC gel kekahi o kona mau waiwai kino koʻikoʻi, kahi e pili pono ai i kāna hana ma nā hoʻomākaukau like ʻole, e like me ka hoʻokuʻu ʻana i kāohi ʻia, ka hoʻokumu ʻana i ka kiʻiʻoniʻoni, ke kūpaʻa, a pēlā aku.

1. ʻAno a me nā waiwai o HPMC

He polymer wai-hoʻoheheʻe ʻia ka HPMC i loaʻa ma ka hoʻokomo ʻana i ʻelua mau pani, hydroxypropyl a me methyl, i loko o ka iwi molekala cellulose. Aia i loko o kona ʻano molekala ʻelua ʻano o nā pani: hydroxypropyl (-CH2CHOHCH3) a me methyl (-CH3). ʻO nā mea e like me ka ʻokoʻa o ka ʻike hydroxypropyl, ke kekelē o ka methylation, a me ke kekelē o ka polymerization e loaʻa kahi hopena koʻikoʻi i ka solubility, ke ʻano gelling, a me nā waiwai mechanical o HPMC.

I loko o nā hopena wai, hoʻokumu ʻo AnxinCel®HPMC i nā hopena colloidal paʻa ma o ka hoʻokumu ʻana i nā pilina hydrogen me nā molekala wai a me ka launa pū ʻana me kona iwi i hoʻokumu ʻia i ka cellulose. Ke loli ke kaiapuni waho (e like me ka mahana, ka ikaika ionic, a me nā mea ʻē aʻe), e loli ka pilina ma waena o nā molekala HPMC, e hopena ana i ka gelation.

2. Ka wehewehe ʻana a me nā mea e hoʻohuli ai i ka mahana gelation

ʻO ka mahana Gelation (Gelation Temperature, T_gel) e pili ana i ka mahana e hoʻomaka ai ka hopena HPMC e hoʻololi mai ka wai a i ka paʻa i ka wā e piʻi ai ka mahana o ka hopena i kahi pae. Ma kēia mahana, e kaupalena ʻia ka neʻe ʻana o nā kaulahao molekala HPMC, e hana ana i kahi ʻano pūnaewele ʻekolu-dimensional, e hopena ana i kahi mea e like me ka gel.

Hoʻopilikia ʻia ka mahana o ka gelation o HPMC e nā kumu he nui, ʻo kekahi o nā mea nui loa ka nui o ka hydroxypropyl. Ma waho aʻe o ka nui o ka hydroxypropyl, ʻo nā kumu ʻē aʻe e hoʻopilikia ai i ka mahana o ka gel e komo pū me ke kaumaha molekala, ka nui o ka hopena, ka waiwai pH, ke ʻano o ka solvent, ka ikaika ionic, a pēlā aku.

3. Ka hopena o ka ʻike hydroxypropyl ma ka mahana o ka gel HPMC

3.1 ʻO ka hoʻonui ʻia o ka nui o ka hydroxypropyl e alakaʻi i ka hoʻonui ʻia o ka mahana o ka gel

Pili loa ka mahana o ka gelation o HPMC i ke kekelē o ka pani hydroxypropyl i loko o kāna molekala. I ka piʻi ʻana o ka nui o ka hydroxypropyl, piʻi ka nui o nā substituents hydrophilic ma ke kaulahao molekala HPMC, e hopena ana i ka hoʻonui ʻia ʻana o ka pilina ma waena o ka molekala a me ka wai. ʻO kēia pilina ke kumu o ka hoʻolōʻihi ʻana o nā kaulahao molekala, a laila e hōʻemi ana i ka ikaika o ka pilina ma waena o nā kaulahao molekala. I loko o kahi pae hoʻohuihui, ʻo ka hoʻonui ʻana i ka nui o ka hydroxypropyl e kōkua i ka hoʻonui ʻana i ke kekelē o ka hydration a paipai i ka hoʻonohonoho like ʻana o nā kaulahao molekala, i hiki ai ke hoʻokumu ʻia kahi ʻano pūnaewele ma kahi mahana kiʻekiʻe. No laila, piʻi pinepine ka mahana o ka gelation me ka piʻi ʻana o ka hydroxypropyl me ka piʻi ʻana o ka nui.

ʻO ka HPMC me ka nui o ka hydroxypropyl (e like me HPMC K15M) ke ʻano o ka hōʻike ʻana i kahi mahana gelation kiʻekiʻe ma ka like like ʻana ma mua o AnxinCel®HPMC me ka haʻahaʻa o ka hydroxypropyl (e like me HPMC K4M). ʻO kēia no ka mea ʻoi aku ka paʻakikī o ka ʻike hydroxypropyl no nā molekala e launa pū a hana i nā pūnaewele ma nā mahana haʻahaʻa, e koi ana i nā mahana kiʻekiʻe e lanakila ai i kēia hydration a paipai i nā pilina intermolecular e hana i kahi ʻano pūnaewele ʻekolu-dimensional.

3.2 Pilina ma waena o ka nui o ka hydroxypropyl a me ka nui o ka hopena

ʻO ka nui o ka hopena he mea nui hoʻi e hoʻopilikia ana i ka mahana gelation o HPMC. I nā hopena HPMC kiʻekiʻe, ʻoi aku ka ikaika o nā pilina intermolecular, no laila hiki ke kiʻekiʻe aʻe ka mahana gelation ʻoiai inā haʻahaʻa ka nui o ka hydroxypropyl. I nā haʻahaʻa haʻahaʻa, nāwaliwali ka pilina ma waena o nā molekala HPMC, a ʻoi aku ka maʻalahi o ka hopena e gel i nā mahana haʻahaʻa.

Ke piʻi ka nui o ka hydroxypropyl, ʻoiai ke piʻi nei ka hydrophilicity, pono nō ka mahana kiʻekiʻe e hana i kahi gel. ʻOi aku hoʻi ma lalo o nā kūlana haʻahaʻa haʻahaʻa, piʻi nui ka mahana gelation. ʻO kēia no ka mea ʻoi aku ka paʻakikī o ka HPMC me ka nui o ka hydroxypropyl e hoʻoulu i nā pilina ma waena o nā kaulahao molekala ma o nā loli mahana, a pono ke kaʻina hana gelation i ka ikehu wela hou e lanakila ai i ka hopena hydration.

3.3 Hopena o ka ʻike hydroxypropyl ma ke kaʻina hana gelation

I loko o kahi pae o ka nui o ka hydroxypropyl, ua hoʻomalu ʻia ke kaʻina hana gelation e ka pilina ma waena o ka hydration a me nā kaulahao molekala. Ke haʻahaʻa ka nui o ka hydroxypropyl i loko o ka molekala HPMC, nāwaliwali ka hydration, ikaika ka pilina ma waena o nā molekala, a hiki i kahi mahana haʻahaʻa ke hoʻoulu i ka hoʻokumu ʻana o ka gel. Ke kiʻekiʻe ka nui o ka hydroxypropyl, hoʻonui nui ʻia ka hydration, nāwaliwali ka pilina ma waena o nā kaulahao molekala, a piʻi ka mahana o ka gelation.

ʻO ke kiʻekiʻe o ka ʻike hydroxypropyl hiki ke alakaʻi i ka hoʻonui ʻia o ka viscosity o ka hopena HPMC, kahi loli e hoʻonui ai i ka mahana hoʻomaka o ka gelation.

He hopena koʻikoʻi ka nui o ka hydroxypropyl i ka mahana o ka gelation oHPMC. Ke piʻi aʻe ka nui o ka hydroxypropyl, piʻi aʻe ka hydrophilicity o HPMC a nāwaliwali ka pilina ma waena o nā kaulahao molekala, no laila e piʻi pinepine ana kona mahana gelation. Hiki ke wehewehe ʻia kēia hanana e ke ʻano pilina ma waena o ka hydration a me nā kaulahao molekala. Ma ka hoʻoponopono ʻana i ka nui o ka hydroxypropyl o HPMC, hiki ke hoʻokō ʻia ka kaohi pololei o ka mahana gelation, a laila e hoʻomaikaʻi i ka hana o HPMC i nā lāʻau lapaʻau, meaʻai a me nā noi ʻoihana ʻē aʻe.