Pharmacopoeia Standard Rau Hydroxypropyl Methyl Cellulose

Tau qhov twg los thiab cov ntsiab lus:
Cov khoom no yog 2-hydroxypropyl ether methyl cellulose. Hydroxypropyl methylcellulose tau muab faib ua plaub hom kev hloov pauv raws li cov ntsiab lus sib txawv ntawm methoxy thiab hydroxypropyl pawg, uas yog 1828, 2208, 2906, thiab 2910 hom. Raws li kev suav cov khoom qhuav, cov ntsiab lus ntawm txhua pawg methoxy hloov pauv (- OCH3) thiab hydroxypropoxy pawg (- OCH2CHOHCH3) yuav tsum ua raws li cov kev cai ntawm cov lus txuas.
Cim:
Cov khoom no yog dawb los yog tawm dawb fibrous los yog granular hmoov; Tsis hnov ​​tsw.
Cov khoom no yuav luag insoluble hauv anhydrous ethanol, ether, thiab acetone; o nyob rau hauv dej txias los tsim ib tug ntshiab los yog me ntsis turbid colloidal tov.
Txheeb xyuas:
(1) Siv 1g ntawm cov khoom no, cua sov 100mL dej (80-90 degree), do tsis tu ncua, thiab txias hauv ib da dej dej khov los ua kua dej khov; Noj 2 mL thiab muab tso rau hauv ib lub raj kuaj. Maj mam ntxiv 1mL ntawm 0.035% anthrone sulfuric acid tov raws phab ntsa raj thiab cia nws zaum rau 5 feeb. Lub nplhaib xiav-ntsuab tshwm ntawm qhov sib cuam tshuam ntawm ob txoj kev daws teeb meem.
(2) Siv cov kua nplaum uas tsim nyog nyob rau hauv cov khoom (1) thiab hliv rau hauv lub khob iav. Tom qab cov dej evaporates, ib daim tawv nyias yog tsim.