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Effects of Thermal Curing Conditions on Drug Release from Polyvinyl Acetate–Polyvinyl Pyrrolidone Matrices

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Abstract

This study aimed to investigate the effects of dry and humid heat curing on the physical and drug release properties of polyvinyl acetate–polyvinyl pyrrolidone matrices. Both conditions resulted in increased tablet hardness; tablets stored under humid conditions showed high plasticity and deformed during hardness testing. Release from the matrices was dependent on the filler's type and level. Release profiles showed significant changes, as a result of exposure to thermal stress, none of the fillers used stabilized matrices against these changes. Density of neat polymeric compacts increased upon exposure to heat; the effect of humid heat was more evident than dry heat. Thermograms of samples cured under dry heat did not show changes, while those of samples stored under high humidity showed significant enlargement of the dehydration endotherm masking the glass transition of polyvinyl acetate. The change of the physical and release properties of matrices could be explained by the hygroscopic nature of polyvinyl pyrrolidone causing water uptake; absorbed water then acts as a plasticizer of polyvinyl acetate promoting plastic flow, deformation, and coalescence of particles, and altering the matrices internal structure. Results suggest that humid heat is more effective as a curing environment than dry heat for polyvinyl acetate–polyvinyl pyrrolidone matrices.

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Acknowledgements

The authors would like to acknowledge the financial support received from the Deanship of Scientific Research at the University of Jordan and the technical help in preparation and testing of matrices in the facilities of Triumpharma Inc., Amman, Jordan, and Specialized Pharma Inc., Amman, Jordan.

The authors also wish to acknowledge the technical help of Ms. Shorouq AlSotari, Ms. Amani Nimer, and Mr. Tareq Najjar. The authors also wish to thank Ms. Suha Muhaissen for help in taking photographs of tested tablets.

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Authors and Affiliations

  1. Faculty of Pharmacy, University of Jordan, Amman, 11942, Jordan

    Hatim S. AlKhatib, Mohammad K. Mohammad, Yasser Bustanji, Bashar AlKhalidi & Khaled M. Aiedeh

  2. Faculty of Allied Health Sciences, The Hashemite University, Zarqa, 13115, Jordan

    Saja Hamed

  3. Sana Pharmaceutical Research Co., Amman, 11171, Jordan

    Samer Najjar

Authors
  1. Hatim S. AlKhatib
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  2. Saja Hamed
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  3. Mohammad K. Mohammad
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  4. Yasser Bustanji
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  5. Bashar AlKhalidi
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  6. Khaled M. Aiedeh
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  7. Samer Najjar
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Correspondence to Hatim S. AlKhatib.

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AlKhatib, H.S., Hamed, S., Mohammad, M.K. et al. Effects of Thermal Curing Conditions on Drug Release from Polyvinyl Acetate–Polyvinyl Pyrrolidone Matrices. AAPS PharmSciTech 11, 253–266 (2010). https://doi.org/10.1208/s12249-010-9378-z

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  • DOI: https://doi.org/10.1208/s12249-010-9378-z

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