Preformulation of FK506 prodrugs for improving solubility

Young Guk Na, Hye Suk Jun, Daehee Kim, Byong Chul Park, Si Kyu Lim, Ki Ho Lee, Sung Joo Hwang, Jeong Sook Park, Sang Hun Jung, Cheong Weon Cho

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In order to improve water solubility of a lipophilic drug, tacrolimus (FK506), two prodrugs (FK506-G or FK506-S) such as FK506-M32-LS-G (FK506-G) and FK506-M32-LS-SL (FK506-S) were synthesized. Two prodrugs (FK506-G or FK506-S), including FK506, were characterized by differential scanning calorimetry (DSC), X-ray diffractometry (XRD), scanning electron microscopy (SEM), enzymatic kinetics, and cytotoxicity. A phase solubility test was conducted in distilled water, and the solubility of two prodrugs (FK506-G or FK506-S) was measured in various pH values for pH solubility profiles. Most interesting was that FK506-S showed the highest solubility, 866 μg/mL in water. In vitro enzymatic kinetics of two prodrugs (FK506-G or FK506-S) in human plasma was evaluated by measuring the decrease of FK506-G or FK506-S as well as the increase of FK506 by HPLC, and FK506-G or FK506-S was metabolized in 1 h in human plasma. Two prodrugs (FK506-G or FK506-S) including FK506 showed an IC50 of 336.6 μg/mL for FK506, 337.9 μg/mL for FK506-G, or 480.1 μg/mL for FK506-S against a conjunctive cell line, Clone 1-5c-4 cells. Taken together, FK506-S could be the most optimal prodrug for aqueous preparations based on preformulation data.

Original languageEnglish
Pages (from-to)1313-1319
Number of pages7
JournalBulletin of the Korean Chemical Society
Issue number8
Publication statusPublished - 2016 Aug 1

Bibliographical note

Publisher Copyright:
© 2016 Korean Chemical Society & Wiley-VCH Verlag GmbH & Co. KGaA.

All Science Journal Classification (ASJC) codes

  • General Chemistry


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