Sustained drug release from electrostatic powder coated tablets with ultrafine ethylcellulose powders

Qingliang Yang, Yingliang Ma, Jesse Zhu

Research output: Journal PublicationArticlepeer-review

23 Citations (Scopus)


In the present study, tablets were successfully coated with ultrafine ethylcellulose powders by using an electrostatic dry powder coating technology and sustained drug release was successfully achieved. The angle of repose (AOR) of the ultrafine powders of ethylcellulose was significantly reduced by adding nano sized colloidal silicon dioxide, indicating a significant improvement of flowability. Variations in charging voltage of the electrostatic gun had a significant influence on the coating powder adhesion and coating efficiency. Lactose and triethyl citrate (TEC) were used as the solid and liquid plasticizers to reduce the glass transition temperature (Tg) of ethylcellulose. The presence of liquid plasticizer could also increase the electrical conductivity of drug tablets so as to promote the coating powder adhesion. Other factors that affect the film formation include curing time and curing temperature. Dissolution tests indicated that the drug release from electrostatic dry powder coated tablets could be altered by adjusting coating level or pore former ratio in the coating formulation.

Original languageEnglish
Pages (from-to)2145-2152
Number of pages8
JournalAdvanced Powder Technology
Issue number5
Publication statusPublished - 1 Sept 2016
Externally publishedYes


  • Curing
  • Electrostatic powder coating
  • Ethylcellulose
  • Plasticizer
  • Pore former
  • Sustained release
  • Ultrafine powders

ASJC Scopus subject areas

  • General Chemical Engineering
  • Mechanics of Materials


Dive into the research topics of 'Sustained drug release from electrostatic powder coated tablets with ultrafine ethylcellulose powders'. Together they form a unique fingerprint.

Cite this