ABSTRACT
Objective To compare the improvement effect of three physical techniques on the transdermal absorption of sinap?ine thiocyanate(ST)in vitro,including microneedles,sonophoresis and iontophoresis,and to evaluate the mechanism and rules of physcial techniques on the transdermal absorption of poorly transdermal absorbed drugs. Methods In vitro transdermal experiment was carried out under the circumstances of microneedles,sonophoresis or iontophoresis,using the modified Franz diffusion pool. The 2 mg/ml ST solution was adopted as the donor solution, and the SD rats′abdomen skin was used as the model skin. Sampling was car?ried out at the predetermined time points and each sample was analyzed by HPLC. Cumulative transdermal amount and steady transder?mal absorption rate were calculated. Pathological slides were made after the skins were treated with microneedles ,sonophoresis and iontophoresis for 12 h. The structure changes were observed to evaluate the transdermal improvement mechanism of different technolo?gies. Results Accumulated transdermal amount of ST was little without any techniques. The transdermal improvement effect of differ?ent technologies was as follows:microneedles>sonophoresis>iontophoresis. A substantial hole formed on the skin by microneedles to promote ST transdermal absorption obviously. Sonophoresis disrupted the tight structure of skin and improved the transdermal absorp?tion of drugs easily. The effect of iontophresis on skin structure was little. Conclusion This study provides experimental evidence for choice of different techniques to improve transdermal absorption.
ABSTRACT
Objective To compare the improvement effect of three physical techniques on the transdermal absorption of sinapine thiocyanate(ST)in vitro, including microneedles, sonophoresis and iontophoresis, and to evaluate the mechanism and rules of physcial techniques on the transdermal absorption of poorly transdermal absorbed drugs. Methods In vitro transdermal experiment was carried out under the circumstances of microneedles, sonophoresis or iontophoresis, using the modified Franz diffusion pool. The 2 mg/ml ST solution was adopted as the donor solution, and the SD rats′ abdomen skin was used as the model skin. Sampling was carried out at the predetermined time points and each sample was analyzed by HPLC. Cumulative transdermal amount and steady transdermal absorption rate were calculated. Pathological slides were made after the skins were treated with microneedles, sonophoresis and iontophoresis for 12 h. The structure changes were observed to evaluate the transdermal improvement mechanism of different technologies. Results Accumulated transdermal amount of ST was little without any techniques. The transdermal improvement effect of different technologies was as follows: Microneedles>sonophoresis>iontophoresis. A substantial hole formed on the skin by microneedles to promote ST transdermal absorption obviously. Sonophoresis disrupted the tight structure of skin and improved the transdermal absorption of drugs easily. The effect of iontophresis on skin structure was little. Conclusion This study provides experimental evidence for choice of different techniques to improve transdermal absorption.
ABSTRACT
Objective To evaluate the improvement of iontophoresis on the transdermal permeation of ferulic acid. Methods The abdominal skin of mice was inserted in the modified Franz diffusion cell. Ferulic acid solution was the donor. The content of drug in the acceptor was quantified using the ultraviolet spectrophotometry. The influence of iontophoresis on permeation of ferulic acid was investigated within 10 hours. Results The transdermal amount of ferulic acid was significantly improved by iontophoresis in vitro. Conclusion Iontophoresis significantly improved ferulic acid permeation across skin. It could be a successful method to promote the skin permeation of other organic acids in traditional Chinese medicines.
ABSTRACT
Objective: To prepare the ethosomes-based gel of demethylzeylasteral (DMZ) and to investigate its properties and transdermal absorption behavior. Methods: The infusion method was used to prepare DMZ ethosomes. The particle size, entrapment efficiency (EE), analysis methodology, and in vitro release behavior were examined, respectively. The in vitro transdermal absorption of ethosomes-based gel of DMZ was evaluated by Franz diffusion cells. Results: The DMZ ethosomes was yellowish emulsion. The average particle size of the ethosomes was (365.2 ± 14.4) nm and the EE was (72.30 ± 2.31)%. The cumulative permeation curve of DMZ in ethosomes-based gel was consistent with Higuchi equation (Q=80.198 t1/2-71.641, r=0.986 8). Compared with common gel, the ethosomes-based gel had 3.94 times higher cumulative permeation amount in 24 h. Conclusion: The prepared ethosomes- based gel of DMZ could enhance the transdermal permeation, which provides evidence for the development of transdermal drug delivery system of DMZ.
ABSTRACT
Objective: To evaluate the improvement of iontophoresis on the transdermal permeation of ferulic acid. Methods: The abdominal skin of mice was inserted in the modified Franz diffusion cell. Ferulic acid solution was the donor. The content of drug in the acceptor was quantified using the ultraviolet spectrophotometry. The influence of iontophoresis on permeation of ferulic acid was investigated within 10 hours. Results: The transdermal amount of ferulic acid was significantly improved by iontophoresis in vitro. Conclusion: Iontophoresis significantly improved ferulic acid permeation across skin. It could be a successful method to promote the skin permeation of other organic acids in traditional Chinese medicines.