Pheophorbide‑a as a Light-Triggered Liposomal
Switch: For the Controlled Release of Alpinia galanga (A. galanga) Essential Oil and Its Stability, Antioxidant,
and Antibacterial Activity Assessment
posted on 2023-01-11, 15:42authored byXiangzhen Ge, Yayun Hu, Huishan Shen, Wei Liang, Zhuangzhuang Sun, Xiuyun Zhang, Wenhao Li
In
this study, Alpinia galanga essential
oil liposomes (EO-Lip) were prepared with soybean lecithin and cholesterol
as wall materials. A light-responsive liposome (EO-PLip) was designed
for the controlled release of A. galanga oil based on the light-responsive properties of Pheophorbide-a.
The dependence of Pheophorbide-a on illumination time was proved by
UV spectroscopy. Characterization techniques such as UV spectroscopy,
transmission electron microscopy, and Fourier transform infrared spectroscopy
demonstrated that the essential oils were successfully encapsulated
in liposomes. Moreover, the particle size of EO-PLip was 166.30 nm,
the polydispersity index was 0.22, the zeta potential was −49.50
mV, and the encapsulation efficiency was 30.83%. Both EO-Lip and EO-Plip
have high sustained-release effects on essential oil and showed light-responsive
release characteristics under infrared stimulation. The prepared liposomes
had good storage stability at 4 °C for 28 d. EO-PLip showed excellent
transient antioxidant and bacteriostatic properties based on the ability
to respond to light and slow release. This EO-PLip provided a platform
for essential oils and might be used as a potent and controllable
solution.