Ni pH iyihe HPMC ishongeshwa

Hydroxypropyl methylcellulose (HPMC)ni polymer ikoreshwa cyane mu miti, amavuta yo kwisiga, n'ibiribwa. Gushonga kwayo biterwa n'ibintu bitandukanye, harimo na pH. Muri rusange, HPMC irashonga haba mu bintu birimo aside na alkaline, ariko gushonga kwayo gushobora gutandukana bitewe n'urwego rwo gusimbuza (DS) n'uburemere bwa molekile (MW) bwa polymer.

Mu bihe by’aside, HPMC ikunze kugaragaza ubushobozi bwo gushonga neza bitewe no kwiyongera kw’amatsinda yayo ya hydroxyl, ibyo bikaba byongera ubushobozi bwayo bwo gushonga no gukwirakwira. Ubushonge bwa HPMC bukunda kwiyongera uko pH igabanuka munsi ya pKa yayo, ikaba iri hagati ya 3.5–4.5 bitewe n’urwego rw’ubuhinduzi.

Ku rundi ruhande, mu bihe bya alkaline, HPMC ishobora no gushonga, cyane cyane iyo pH iri hejuru. Iyo pH ya alkaline ibaye, habaho gushonga kw'amatsinda ya hydroxyl, bigatuma gushonga kwiyongera binyuze mu guhuza hydrogen na molekile z'amazi.

Ariko, ni ngombwa kumenya ko pH nyayo HPMC ishobora gushonga ishobora gutandukana bitewe n’urwego runaka rwa HPMC, urugero rwayo rwo gusimbuza, n’uburemere bwayo bwa molekile. Ubusanzwe, amanota ya HPMC afite dogere zo hejuru zo gusimbuza n’uburemere buke bwa molekile agaragaza ubushobozi bwo gushonga neza iyo pH iri hasi.

Mu miti ikoreshwa mu buvuzi,HPMCikunze gukoreshwa nk'ikintu gihindura imiterere y'umuti, ikintu gikomeza ubushyuhe, cyangwa ikintu gikomeza guhindagurika. Imiterere y'uburyo ishonga ni ingenzi mu kugenzura uburyo imiti isohoka, ubushyuhe bw'imiti, no kudahindagurika kwa emulsion cyangwa suspensions.

Mu gihe HPMC muri rusange ishongeshwa mu rugero rwa pH runini, imyitwarire yayo yo gushonga ishobora guhindurwa neza binyuze mu guhindura pH y'umuti no guhitamo urwego rukwiye rwa HPMC hashingiwe ku ikoreshwa ryifuzwa.