| Summary: | Yu-Shuan Chen,1–3 Yu-Han Chiu,3 Yuan-Sheng Li,3 En-Yi Lin,3,4 Dean-Kuo Hsieh,5 Chia-Hung Lee,3 Mao-Hsuan Huang,1 Hong-Meng Chuang,1 Shinn-Zong Lin,1,6 Horng-Jyh Harn,1,7,* Tzyy-Wen Chiou3,*1Bioinnovation Center, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan, Republic of China; 2Department of Medical Research, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan, Republic of China; 3Department of Life Science and Graduate Institute of Biotechnology, National Dong Hwa University, Hualien, Taiwan, Republic of China; 4Department of Chemistry, National Dong Hwa University, Hualien, Taiwan, Republic of China; 5Department and Graduate Institute of Applied Chemistry, Chaoyang University of Technology, Taichung, Taiwan, Republic of China; 6Department of Neurosurgery, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan, Republic of China; 7Department of Pathology, Hualien Tzu Chi Hospital, Tzu Chi University, Hualien, Taiwan, Republic of China*These authors contributed equally to this workIntroduction: Kolliphor® EL (K-EL) is among the most useful surfactants in the preparation of emulsions. However, it is associated with low hydrophobic drug loading in the resulting emulsified formulation.Methods: In this study, a formulation for intranasal administration of butylidenephthalide (Bdph), a candidate drug against glioblastoma (GBM), was prepared. Physical characteristics of the formulation such as particle size, zeta potential, conductivity, and viscosity were assessed, as well as its cytotoxicity and permeability, in order to optimize the formulation and improve its drug loading capacity.Results: The optimized formulation involved the integration of polyethylene glycol 400 (PEG 400) in K-EL to encapsulate Bdph dissolved in dimethyl sulfoxide (DMSO), and it exhibited higher drug loading capacity and drug solubility in water than the old formulation, which did not contain PEG 400. Incorporation of PEG 400 as a co-surfactant increased Bdph loading capacity to up to 50% (v/v), even in formulations using Kolliphor® HS 15 (K-HS15) as a surfactant, which is less compatible with Bdph than K-EL. The optimized Bdph formulation presented 5- and 2.5-fold higher permeability and cytotoxicity, respectively, in human GBM than stock Bdph. This could be attributed to the high drug loading capacity and the high polarity index due to DMSO, which increases the compatibility between the drug and the cell. Rats bearing a brain glioma treated with 160 mg/kg intranasal emulsified Bdph had a mean survival of 37 days, which is the same survival time achieved by treatment with 320 mg/kg stock Bdph. This implies that the optimized emulsified formulation required only half the Bdph dose to achieve an efficacy similar to that of stock Bdph in the treatment of animals with malignant brain tumor.Keywords: glioblastoma, polyethylene glycol 400, butylidenephthalide, loading capacity, permeability, intranasal administration
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