Evaluation of coat uniformity and taste-masking efficiency of irregular-shaped drug particles coated in a modified tangential spray fluidized bed processor

Min Xu, Paul Wan Sia Heng, Celine Valeria Liew

Research output: Contribution to journalReview ArticleResearchpeer-review

15 Citations (Scopus)


Objective: To explore the feasibility of coating irregular-shaped drug particles in a modified tangential spray fluidized bed processor (FS processor) and evaluate the coated particles for their coat uniformity and taste-masking efficiency.Methods: Paracetamol particles were coated to 20%, w/w weight gain using a taste-masking polymer insoluble in neutral and basic pH but soluble in acidic pH. In-process samples (5, 10 and 15%, w/w coat) and the resultant coated particles (20%, w/w coat) were collected to monitor the changes in their physicochemical attributes.Results: After coating to 20%, w/w coat weight gain, the usable yield was 81% with minimal agglomeration (< 5%). Some aerodynamic modifications to particle shape and surface morphology were observed for the in-process samples with 5 and 10% coat compared with the uncoated particles. A 15%, w/w coat was optimal for inhibiting drug release in salivary pH with subsequent fast dissolution in simulated gastric pH.Conclusion: The FS processor shows promise for direct coating of irregular-shaped drug particles with wide size distribution. The coated particles with 15% coat were sufficiently taste masked and could be useful for further application in orally disintegrating tablet platforms.

Original languageEnglish
Pages (from-to)1597-1606
Number of pages10
JournalExpert Opinion on Drug Delivery
Issue number10
Publication statusPublished - 2015
Externally publishedYes


  • coat uniformity
  • coating
  • drug particles
  • fluidized bed
  • swirling airflow
  • taste masking

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