AAPS PharmSciTech

, Volume 14, Issue 4, pp 1333–1340 | Cite as

Stability of Benzocaine Formulated in Commercial Oral Disintegrating Tablet Platforms

  • Melanie Köllmer
  • Carmen Popescu
  • Prashanth Manda
  • Leon Zhou
  • Richard A. Gemeinhart
Research Article


Pharmaceutical excipients contain reactive groups and impurities due to manufacturing processes that can cause decomposition of active drug compounds. The aim of this investigation was to determine if commercially available oral disintegrating tablet (ODT) platforms induce active pharmaceutical ingredient (API) degradation. Benzocaine was selected as the model API due to known degradation through ester and primary amino groups. Benzocaine was either compressed at a constant pressure, 20 kN, or at pressure necessary to produce a set hardness, i.e., where a series of tablets were produced at different compression forces until an average hardness of approximately 100 N was achieved. Tablets were then stored for 6 months under International Conference on Harmonization recommended conditions, 25°C and 60% relative humidity (RH), or under accelerated conditions, 40°C and 75% RH. Benzocaine degradation was monitored by liquid chromatography–mass spectrometry. Regardless of the ODT platform, no degradation of benzocaine was observed in tablets that were kept for 6 months at 25°C and 60% RH. After storage for 30 days under accelerated conditions, benzocaine degradation was observed in a single platform. Qualitative differences in ODT platform behavior were observed in physical appearance of the tablets after storage under different temperature and humidity conditions.

Key words

benzocaine degradation oral disintegrating tablet platform stability 



This investigation was conducted in a facility constructed with support from Research Facilities Improvement Program Grant C06 RR15482 from the National Centre for Research Resources, NIH. This research was funded in part by Roquette America, Inc. The authors would like to thank Dr. Jerry White and Bryan Zahakaylo of UIC-RRC Mass Spectrometry Facility for significant help with LC-MS.


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Copyright information

© American Association of Pharmaceutical Scientists 2013

Authors and Affiliations

  • Melanie Köllmer
    • 1
  • Carmen Popescu
    • 2
  • Prashanth Manda
    • 2
    • 3
  • Leon Zhou
    • 2
  • Richard A. Gemeinhart
    • 1
    • 4
    • 5
  1. 1.Department of Biopharmaceutical SciencesUniversity of IllinoisChicagoUSA
  2. 2.Roquette America Inc.GenevaUSA
  3. 3.Department of PharmaceuticsUniversity of MississippiUniversityUSA
  4. 4.Department of BioengineeringUniversity of IllinoisChicagoUSA
  5. 5.Department of Ophthalmology and Visual SciencesUniversity of IllinoisChicagoUSA

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