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Study on the interactions between polyvinylpyrrolidone (PVP) and acetaminophen crystals: partial dissolution pattern
Hong Wen1, Kenneth R Morris, Kinam Park
1Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, Indiana 47907-1336, USA. hwen03@yahoo.com
Journal of Pharmaceutical Sciences
|September 2, 2005
Summary
Polyvinylpyrrolidone (PVP) affects acetaminophen crystal surfaces, altering etching patterns and dissolution rates. Adsorbed PVP influences crystal dissolution via van der Waals forces, impacting solubility and intrinsic dissolution rate.
Area of Science:
- Physical Chemistry
- Materials Science
- Pharmaceutical Sciences
Background:
- Acetaminophen is a widely used analgesic.
- Polyvinylpyrrolidone (PVP) is a common pharmaceutical excipient.
- Understanding drug-excipient interactions is crucial for drug formulation.
Purpose of the Study:
- To investigate the interactions between polyvinylpyrrolidone (PVP) and acetaminophen crystals.
- To study the effects of PVP on acetaminophen crystal surface morphology, solubility, and dissolution rate.
Main Methods:
- Analysis of acetaminophen crystal etching patterns in the presence of PVP.
- Solubility studies of acetaminophen in PVP solutions.
- Measurement of the intrinsic dissolution rate (IDR) of acetaminophen crystals in PVP solutions.
Main Results:
- PVP adsorption on acetaminophen (010) face led to stable ledges along the a-axis and deviations along the c-axis.
- PVP (K30) enhanced acetaminophen solubility at concentrations above 1 mg/mL.
- The intrinsic dissolution rate (IDR) of acetaminophen in diluted PVP solutions was lower than in water, not attributable to viscosity changes.
Conclusions:
- PVP molecules adsorbed on acetaminophen crystal surfaces significantly influence etching patterns.
- Adsorbed PVP affects acetaminophen's intrinsic dissolution rate through mechanisms beyond simple viscosity changes, likely involving van der Waals interactions.
- These findings highlight the importance of PVP-acetaminophen surface interactions in pharmaceutical development.