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Honokiol/Magnolol-Loaded Self-Assembling Lecithin-Based Mixed Polymeric Micelles (lbMPMs) for Improving Solubility to Enhance Oral Bioavailability

Authors Lin HL, Cheng WT, Chen LC, Ho HO, Lin SY, Hsieh CM

Received 6 November 2020

Accepted for publication 7 January 2021

Published 26 January 2021 Volume 2021:16 Pages 651—665


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Yan Shen

Hong-Liang Lin,1 Wen-Ting Cheng,2 Ling-Chun Chen,3 Hsiu-O Ho,2 Shyr-Yi Lin,4,5 Chien-Ming Hsieh2

1School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China; 2School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 11031, Taiwan, Republic of China; 3Department of Biotechnology and Pharmaceutical Technology, Yuanpei University of Medical Technology, Hsinchu 30015, Taiwan, Republic of China; 4Division of Gastroenterology, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan, Republic of China; 5Department of General Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan, Republic of China

Correspondence: Shyr-Yi Lin; Chien-Ming Hsieh 250 Wu-Hsing Street, Taipei 11031, Taiwan, Republic of China
Tel +886-2-27361661 ext 6112
Fax +886-2-23771942

Objective: This study was intended to utilize lecithin-based mixed polymeric micelles (lbMPMs) for enhancing the solubility and bioavailability of honokiol and magnolol to resolve the hindrance of their extreme hydrophobicity on the clinical applications.
Methods: Lecithin was selected to increase the volume of the core of lbMPMs, thereby providing a greater solubilization capacity. A series of amphiphilic polymers (sodium deoxycholate [NaDOC], Cremophor®, and Pluronic® series) were included with lecithin for screening and optimization.
Results: After preliminary evaluation and subsequentially optimization, two lbMPMs formulations composed of honokiol/magnolol:lecithin:NaDOC (lbMPMs[NaDOC]) and honokiol/magnolol:lecithin:PP123 (lbMPMs[PP123]) in respective ratios of 6:2:5 and 1:1:10 were optimally obtained with the mean particle sizes of 80– 150 nm, encapsulation efficacy (EEs) of > 90%, and drug loading (DL) of > 9.0%. These lbMPMs efficiently stabilized honokiol/magnolol in phosphate-buffered saline (PBS) at room temperature or 4 °C and in fetal bovine serum or PBS at 37 °C. PK study demonstrated that lbMPMs[NaDOC] showed much improvement in enhancing bioavailability than that by lbMPMs[PP123] for both honokiol and magnolol. The absolute bioavailability for honokiol and magnolol after intravenous administration of lbMPMs[NaDOC] exhibited 0.93- and 3.4-fold increases, respectively, compared to that of free honokiol and magnolol. For oral administration with lbMPMs[NaDOC], the absolute bioavailability of honokiol was 4.8%, and the absolute and relative bioavailability of magnolol were 20.1% and 2.9-fold increase, respectively.
Conclusion: Overall, honokiol/magnolol loaded in lbMPMs[NaDOC] showed an improvement of solubility with suitable physical characteristics leading to enhance honokiol and magnolol bioavailability and facilitating their wider application as therapeutic agents for treating human disorders.

Keywords: lecithin, mixed polymeric micelles, honokiol, magnolol, sodium deoxycholate, pluronic

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