The objective of this study was to develop oral matrix tablets for the sustained release of vitamin C. In this study hydroxypropyl methylcellulose (HPMC) has been utilized as an excipient, as it is one of the most widely used polymers, for use during long periods of time in formations. The vitamin C tablet formulation depends on the molecular weight and concentration of sustained-delivery in HPMC. Anti-oxidants have been added as a dissolution medium in order to prevent vitamin C degradation in water. The dissolution test was carried out in a distilled water medium, and the release model equation was applied to analyze the vitamin C release pattern. The results demonstrated that the release and lasting power of vitamin C tablets, containing HPMC, lasted for more than 12 h.

This article presents an evaluation of the effects of coating conditions on the enteric coating quality of soft gelatin capsules containing Omega-3 fatty acids. Three conditions were controlled: concentration of hydroxypropyl methylcellulose phthalate (6, 8, and 10 wt% in solution), temperature of the inlet air (32, 35, and 38 o C), and the coating solution feed rate (7.5, 11.25, and 15.0 g/min). The transparency of the enteric coated soft gelatin capsules was evaluated by measuring the degree of whiteness of the surface using a spectrophotometer. Results showed that the most important parameter in the enteric coating process was the coating solution feed rate. As the coating solution feed rate decreased and inlet air temperature increased, the degree of whiteness of coating surfaces decreased. We also evaluated the disintegration properties of the enteric coated capsules in accordance with the Korea Health Functional Food Code.