Qhov sib txawv ntawm hydroxypropyl starch thiab Hydroxypropyl methyl cellulose

Hydroxypropyl starch thiab hydroxypropyl methyl cellulose (HPMC) yog ob qho tib si hloov polysaccharides siv nyob rau hauv ntau yam lag luam, suav nrog zaub mov, tshuaj, tshuaj pleev ib ce, thiab kev tsim kho. Thaum lawv qhia qee qhov zoo sib xws, lawv muaj qhov sib txawv ntawm cov qauv tshuaj, khoom, thiab kev siv. Nov yog qhov sib txawv tseem ceeb ntawm hydroxypropyl starch thiab HPMC:

Chemical Structure:

1. Hydroxypropyl Starch:
   • Hydroxypropyl starch yog cov hmoov txhuv nplej siab hloov tau los ntawm kev qhia cov pab pawg hydroxypropyl mus rau cov hmoov txhuv nplej siab.
   • Cov hmoov txhuv nplej siab yog ib qho polysaccharide uas muaj cov piam thaj sib txuas ua ke los ntawm glycosidic bonds. Hydroxypropylation suav nrog kev hloov pauv ntawm pawg hydroxyl (-OH) hauv cov hmoov txhuv nplej siab nrog hydroxypropyl (-CH2CHOHCH3) pawg.
2. Hydroxypropyl Methyl Cellulose (HPMC):
   • HPMC yog hloov kho cellulose ether tau los ntawm kev qhia ob pawg hydroxypropyl thiab methyl mus rau cellulose molecule.
   • Cellulose yog polysaccharide uas muaj cov piam thaj txuas ua ke los ntawm β (1 → 4) glycosidic bonds. Hydroxypropylation qhia hydroxypropyl (-CH2CHOHCH3) pawg, thaum methylation qhia methyl (-CH3) pawg mus rau hauv cov pob txha cellulose.

Khoom:

1. Solubility:
   • Hydroxypropyl hmoov txhuv nplej siab feem ntau yog soluble hauv dej kub tab sis tuaj yeem pom muaj kev solubility tsawg hauv dej txias.
   • HPMC yog soluble nyob rau hauv ob qho tib si dej txias thiab kub, ua kom meej, viscous daws. Lub solubility ntawm HPMC nyob ntawm qhov degree ntawm kev hloov pauv (DS) thiab qhov hnyav molecular ntawm cov polymer.
2. viscosity:
   • Hydroxypropyl hmoov txhuv nplej siab tuaj yeem pom cov viscosity-txhim kho cov khoom, tab sis nws cov viscosity feem ntau qis dua piv rau HPMC.
   • HPMC paub txog nws cov thickening zoo heev thiab viscosity-hloov cov khoom. Lub viscosity ntawm HPMC cov kev daws teeb meem tuaj yeem hloov kho los ntawm qhov sib txawv ntawm cov polymer concentration, DS, thiab molecular hnyav.

Daim ntawv thov:

1. Khoom noj khoom haus thiab Pharmaceuticals:
   • Hydroxypropyl starch feem ntau yog siv los ua cov thickener, stabilizer, thiab gelling tus neeg sawv cev hauv cov khoom noj xws li kua zaub, kua ntses, thiab khoom qab zib. Nws kuj tseem siv tau rau hauv cov tshuaj formulations.
   • HPMC yog dav siv nyob rau hauv cov zaub mov, tshuaj, thiab tshuaj pleev ib ce raws li ib tug thickener, emulsifier, stabilizer, zaj duab xis qub, thiab tswj-tso tus neeg saib xyuas. Nws feem ntau pom muaj nyob rau hauv cov khoom xws li ntsiav tshuaj, tshuaj pleev, cream, thiab cov khoom tu tus kheej.
2. Kev tsim kho thiab cov khoom siv hauv tsev:
   • HPMC feem ntau siv hauv kev tsim kho kev lag luam raws li cov khoom siv ntxiv hauv cov khoom siv cement xws li pobzeb nplaum, mortars, renders, thiab plasters. Nws muab kev tuav dej, ua haujlwm, ua kom zoo, thiab txhim kho kev ua haujlwm hauv cov ntawv thov no.

Xaus:

Thaum ob qho tib si hydroxypropyl starch thiab HPMC tau hloov kho polysaccharides nrog cov haujlwm zoo sib xws, lawv muaj cov qauv tshuaj sib txawv, cov khoom, thiab kev siv. Hydroxypropyl hmoov txhuv nplej siab feem ntau yog siv rau hauv cov khoom noj thiab tshuaj siv, thaum HPMC pom kev siv dav hauv zaub mov, tshuaj, tshuaj pleev ib ce, thiab cov khoom siv. Kev xaiv ntawm hydroxypropyl hmoov txhuv nplej siab thiab HPMC yog nyob ntawm cov kev cai tshwj xeeb ntawm daim ntawv thov.