Abstract:
The study investigated the transdermal niacin drug delivery patch for hyperlipidemia treatment. The gelatin and polyacrylamide were used as a patch matrix. The swelling property and the permeation characteristic were investigated. This study aimed to investigate the suitable gelatin and polyacrylamide ratios, gelatin/polyacrylamide hydrogel was prepared at various hydrogel ratios (gelatin: polyacrylamide 0:100, 5:95, 10:90, 15:85, 20:80). The permeation characteristic of gelatin/polyacrylamide hydrogel at the gelatin and polyacrylamide ratio of 10:90 % wt was investigated by using modified Franz diffusion cells at pH 7.4 and a temperature of 37 degree Celsius for 24 h with or without external electrical potential, ultrasound, and a hybrid system. To investigate the effect of crosslinking ratio on the permeation characteristic, gelatin/polyacrylamide hydrogel was prepared at various crosslinking ratio (Mol[subscriptMBAA] /Mol[subscriptAM] at 0.001, 0.005, 0.01, 0.035 for GE_PAM_0.001, GE_PAM_0.005, GE_PAM_0.01 and GE_PAM_0.035). The results showed that the swelling and % weight loss of the hybrid hydrogel increased with the higher level of gelatin concentration.
From the investigation on the drug permeation, the amount of drug permeation tended to increase correlated with different periods of time and reach the equilibrium value at the 5th hour. At the GE PAM of 0.001, the amount of drug permeation was higher than other crosslinking ratio due to the highest % swelling. The amount of drug permeation increased with increasing electrical potential because of electric repulsive force. When being applied with the 40 kHz ultrasound to increase the drug delivery efficiency, the amount of drug permeation highly increased with the longer duration of ultrasound due to thermal effects. In the hybrid system that combined the electrical potential with the ultrasound, the amount of drug permeation was 78.24%, which was higher than that of either the electrical potential or only the ultrasound.
Thus Gel/PAAM hydrogel, which was efficient in the drug permeation can be developed to become the niacin transdermal patch when being controlled by the external electrical potential, and ultrasound.