Sustained release of risperidone from biodegradable microspheres prepared by in-situ suspension-evaporation process

Taekun An, Juhyuen Choi, Aram Kim, Jin Ho Lee, Yoonjin Nam, Junsung Park, Bo Kyung Sun, Hearan Suh, Cherng Ju Kim, Sung Joo Hwang

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Risperidone-loaded poly (d,l-lactide-co-glycolide) (PLGA) microspheres were prepared with a suspension-evaporation process with an aqueous suspension containing an in situ-formed aluminum hydroxide inorganic gel (SEP-AL process) and evaluated for encapsulation efficiency, particle size, surface morphology, glass transition temperature, in vitro drug release profile, and in vivo behavior. The SEP-AL microspheres were compared with conventional oil-in-water (O/W) emulsion solvent evaporation method using polyvinylalcohol (PVA) as an emulsifier (CP-PVA process). The microspheres were spherical in shape. DSC measurements showed that risperidone crystallinity was greatly reduced due to the homogeneous distribution of risperidone in PLGA microspheres. In vitro drug release profile from the microspheres showed a sigmoidal pattern of negligible initial burst up to 24 h and minimal release (time-lag) for 7 days. After the lag phase, slow release took a place up to 25 days and then rapid release occurred sharply for 1 week. In vivo rat pharmacokinetic profile from the microspheres showed very low blood concentration level at the initial phase (up to 24 h) followed by the latent phase up to 21 days. At the 3rd week, main phase started and the blood concentration of the drug increased up to the 5th week, and then gradually decreased. The risperidone-loaded PLGA microspheres produced by SEP-AL process showed excellent controlled release characteristics for the effective treatment of schizophrenia patients.

Original languageEnglish
Pages (from-to)8-15
Number of pages8
JournalInternational Journal of Pharmaceutics
Issue number1-2
Publication statusPublished - 2016 Apr 30

Bibliographical note

Funding Information:
This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare , Republic of Korea ( HI14C1771 ), by the Technological Innovation R&D Program ( SA113949 ) funded by the Small and Medium Business Administration (SMBA, Republic of Korea), and by the Mid-career Researcher Program funded by the Ministry of Science, ICT and Future Planning, Republic of Korea( NRF-2014R1A2A2A01005059 ).

Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Pharmaceutical Science


Dive into the research topics of 'Sustained release of risperidone from biodegradable microspheres prepared by in-situ suspension-evaporation process'. Together they form a unique fingerprint.

Cite this