Vitamin K1–loaded lipid-core nanocapsules: physicochemical characterization and in vitro skin permeation
Silvia Stanisçuaski Guterres
Faculdade de Farmácia
Universidade Federal do Rio Grande do Sul
Av. Ipiranga 2752, Porto Alegre
CEP 90610-000 RS
Tel: 55 51 33085500
Fax: 55 51 33085090
The incorporation of substances in nanocarriers can modulate and/or manage their delivery profiles (immediate or sustained) and permeation through skin. Consequently, drug nanencapsulation intended for topical treatment can reduce the systemic absorption of the substance.
To obtain and characterize vitamin K1–loaded lipid core nanocapsules as well as to determine whether the nanoencapsulation influences the skin permeation of this vitamin.
The skin permeation study was performed by means of Franz-type diffusion cells followed by the tape stripping and retention techniques. The vitamin K1–loaded lipid core nanocapsules were obtained by the preformed polymer precipitation method and the particles were characterized.
The nanocapsules presented average diameter of 211 ± 2 nm, pH of 5.7 ± 0.3, zeta potential of –14.9 ± 0.6 mV and drug content of 10.2 mg/mL (102.1%). The physical stability of the nanocapsule suspension was verified using multiple light backscattering analysis. The amount of vitamin K1 in the dermis after 8 h of drug permeation was higher when the nanocapsules were applied compared to the control. Moreover, retention in the outermost skin layer and a decrease in the skin permeation to the receptor compartment due to the nanoencapsulation were observed.
Thus, nanoencapsulation can lead to the selective permeation of vitamin K1 through the skin.