Cov txheej txheem tshwj xeeb uas PVP (polyvinylpyrrolidone) txhim kho cov tshuaj solubility feem ntau suav nrog cov hauv qab no:
1. Hydrogen bonding:
- Cov pab pawg carbonyl hauv PVP molecule tuaj yeem hydrogen daim ntawv cog lus nrog cov nquag hydrogen hauv cov tshuaj molecule insoluble. Qhov kev sib txuas ntawm hydrogen no tuaj yeem ua rau kom muaj hydrophilicity ntawm cov tshuaj molecules, yog li txhim kho cov solubility ntawm cov tshuaj.
- Piv txwv li, PVP tuaj yeem khi rau qee cov tshuaj molecules los ntawm hydrogen bonds, ua rau nws yooj yim dua rau cov tshuaj molecules cuam tshuam nrog dej molecules, yog li ua kom cov tshuaj solubility ntawm cov tshuaj.
2. Tsim cov coprecipitates:
- PVP tuaj yeem tsim co-precipitates nrog cov tshuaj tsis zoo soluble, ua rau cov tshuaj sib cais hauv PVP macromolecules hauv lub xeev amorphous. Lub xeev amorphous no tuaj yeem ua rau kom cov tshuaj solubility nce ntxiv.
- Piv txwv li, thaum PVP tov nrog qee cov tshuaj tsis zoo soluble, cov tshuaj molecules yuav tawg mus rau hauv PVP macromolecules hauv lub xeev amorphous, yog li ua kom cov tshuaj solubility ntawm cov tshuaj.
3. Solubilization:
- PVP tuaj yeem siv los ua cov tshuaj solubilizer los ua kom cov dej solubility ntawm cov tshuaj tsis zoo hauv dej. Cov pab pawg hydrophilic ntawm PVP tuaj yeem tsim cov ntawv cog lus hydrogen nrog cov dej molecules, yog li ua kom cov dej solubility ntawm cov tshuaj.
- Piv txwv li, PVP tuaj yeem tsim cov complexes nrog qee cov tshuaj tsis zoo soluble, ua rau cov tshuaj yooj yim dua soluble hauv dej, yog li txhim kho cov solubility ntawm cov tshuaj.
4. Txhim kho tshuaj stability:
- PVP tuaj yeem tiv thaiv cov tshuaj los ntawm ib puag ncig acidic, enzymatic hydrolysis thiab lwm yam degradation, yog li txhim kho kev ruaj ntseg ntawm cov tshuaj. Qhov kev ruaj ntseg no tuaj yeem pab ua kom tawg thiab nqus cov tshuaj hauv lub cev.
- Piv txwv li, PVP tiv thaiv cov tshuaj los ntawm kev ua txhaum ntawm lub plab acid thiab digestive enzymes, kom ntseeg tau tias cov tshuaj khaws nws cov haujlwm ua ntej mus txog qhov chaw nqus.
5. Txhawb kev nqus tshuaj:
- PVP tuaj yeem txhawb kev nqus tshuaj hauv plab hnyuv. Los ntawm kev tsim cov tshuaj nrog cov tshuaj, PVP tuaj yeem pab cov tshuaj nkag mus rau hauv plab hnyuv mucosa yooj yim dua, yog li txhim kho kev nqus tshuaj.
- Piv txwv li, PVP tuaj yeem tsim cov complexes nrog qee cov tshuaj, ua rau nws yooj yim dua rau cov tshuaj nkag mus rau hauv plab hnyuv mucosa thiab nkag mus rau hauv cov ntshav.
Feem ntau, PVP tuaj yeem txhim kho kev solubility ntawm cov tshuaj tsis zoo los ntawm ntau lub tswv yim xws li hydrogen bonding, tsim ntawm co-precipitates, solubilization, txhim kho cov tshuaj stability, thiab txhawb kev nqus tshuaj. Cov khoom no ua rau PVP yog qhov tseem ceeb heev hauv kev tsim tshuaj thiab kev xa tshuaj.
