Physicochemical properties and antioxidant activity of gamma-oryzanol-loaded liposome formulations for topical use

Abstract

The objective of this study is to prepare the γ-oryzanol-loaded liposomes and investigate their physicochemical properties and antioxidant activity intended for cosmetic applications. Liposomes, Composing phosphatidylCholine (PC) and Cholesterol (Chol), CHAPS or sodium taurocholate (NaTC) were prepared by sonication method. γ-oryzanol-loaded liposomes were prepared by using 3, 5 and 10% γ-oryzanol as an initial concentration. The formulation factors in a particular type and composition of lipid and initial drug loading on the physicochemical properties (i.e., particle size, zeta potential, entrapment efficiency, drug release) and antioxidant activity were studied. The particle sizes of bare liposomes were in nanometer range. The γ-oryzanol-loaded liposomes in formulations of PC/CHAPS and PC/NaTC liposomes were smaller than PC/Chol liposomes. The incorporation efficiency of 10% γ-oryzanol-loaded PC/Chol liposomes was less than γ-oryzanol-loaded PC/CHAPS liposomes and PC/NaTC liposomes allowing higher in vitro release rate due to higher free γ-oryzanol in buffer solution. The antioxidant activity of γ-oryzanol-loaded liposomes was not different from pure γ-oryzanol. Both γ-oryzanol-loaded PC/CHAPS liposomes and PC/NaTC liposomes were showed to enhance the antioxidant activity in NHF cells. γ-oryzanol-loaded PC/Chol liposomes demonstrated the lowest cytotoxicity in NHF cells. It was conceivably concluded that liposomes prepared in this study are suitable for γ-oryzanol incorporation without loss of antioxidant activity.

Keywords::

• Liposomes
• antioxidant
• in vitro release
• gamma-oryzanol

Acknowledgments

This work was supported by Commission of Higher Education (Thailand), The Thailand Research Fund (RSA 5280001), National Research Council of Thailand and Silpakorn University Research and Development Institute.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.