Novel Alternating Current Electrospinning of Hydroxypropylmethylcellulose Acetate Succinate (HPMCAS) Nanofibers for Dissolution Enhancement: The Importance of Solution Conductivity

Attila Balogh, Balázs Farkas, Ádám Pálvölgyi, András Domokos, Balázs Démuth, G. Marosi, Zsombor Kristóf Nagy

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13 Citations (Scopus)


Novel, high-yield alternating current electrospinning (ACES) and direct current electrospinning methods were investigated to prepare high-quality hydroxypropylmethylcellulose acetate succinate (HPMCAS) fibers for the dissolution enhancement of poorly soluble spironolactone. Although HPMCAS is of great pharmaceutical importance as a carrier of marketed solid dispersion-based products, it was found to be unprocessable using electrospinning. Addition of small amounts of polyethylene oxide as aid polymer provided smooth fibers with direct current electrospinning but strongly beaded products with ACES. Solution characteristics were thus modified by introducing further excipients. In the presence of sodium dodecyl sulfate, high-quality, HPMCAS-based fibers were obtained even at higher throughput rates of ACES owing to the change in conductivity (rather than surface tension). Replacement of sodium dodecyl sulfate with non-surface-active salts (calcium chloride and ammonium acetate) maintained the fine quality of nanofibers, confirming the importance of conductivity in ACES process. The HPMCAS-based fibers contained spironolactone in an amorphous form according to differential scanning calorimetry and X-ray powder diffraction. In vitro dissolution tests revealed fast drug release rates depending on the salt used to adjust conductivity. The presented results signify that ACES can be a prospective process for high-scale production of fibrous solid dispersions in which conductivity of solution has a fundamental role.

Original languageEnglish
Pages (from-to)1634-1643
Number of pages10
JournalJournal of Pharmaceutical Sciences
Issue number6
Publication statusPublished - Jun 1 2017



  • dissolution
  • excipients
  • formulation
  • nanotechnology
  • oral drug delivery
  • polymeric drug delivery systems
  • poorly water-soluble drugs
  • solid dispersion

ASJC Scopus subject areas

  • Pharmaceutical Science

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