Quercetin solid lipid microparticles: A flavonoid for inhalation lung delivery

Santo Scalia, Mehra Haghi, Vanessa Losi, Valentina Trotta, Paul M. Young, Daniela Traini

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Purpose: The aim of the present work was to develop solid lipid microparticles (SLMs), as dry powders containing quercetin for direct administration to the lung.

Methods: Quercetin microparticles were prepared by o/w emulsification via a phase inversion technique, using tristearin as the lipid component and phosphatidylcholine as an emulsifier. The quercetin SLMs were characterised for morphology, drug loading (15.5% ± 0.6, which corresponded to an encapsulation efficiency of 71.4%), particle size distribution, response to humidity, crystallinity, thermal behaviour and in vitro respirable fraction. Furthermore, the toxicity and the in vitro transport of the SLMs on an air liquid interface model of the Calu-3 cell line were also investigated using a modified twin-stage impinger apparatus.

Results: Results showed that quercetin SLMs could be formulated as dry powder suitable for inhalation drug delivery (20.5 ± 3.3% fine particle fraction ⩽4.46 μm) that was absorbed, via a linear kinetic model across the Calu-3 monolayer (22.32 ± 1.51% over 4 h). In addition, quercetin SLMs were shown to be non-toxic at the concentrations investigated. Interestingly, no apical to basolateral transport of the micronised quercetin was observed over the period of study.

Conclusions: These observations suggest quercetin diffusion was enhanced by the presence of the lipid/emulsifying excipients in the SLMs; however further studies are necessary to elucidate the exact mechanisms.
Original languageEnglish
Pages (from-to)278-285
Number of pages8
JournalEuropean Journal of Pharmaceutical Sciences
Issue number2
Publication statusPublished - 13 May 2013
Externally publishedYes


  • Quercetin
  • Anti-asthmatic
  • Solid–lipid particle
  • Inhalation
  • Dry powder


Dive into the research topics of 'Quercetin solid lipid microparticles: A flavonoid for inhalation lung delivery'. Together they form a unique fingerprint.

Cite this