Results and Discussion
From the deproteinization process, the total protein content in DNRL, determined by Kjedahl methods
as described in ASTM D3533 [10], was reduced for more than 89.22% comparing with that in the fresh
NRL [5]. DNRL blended with HPMC, DBP, and various enhancers could form the yellowish transparent
films. The physical and mechanical properties of the DNRL blended films are shown in Table 2. The
thickness ranged between 0.27-0.43 mm. Their low standard deviation values indicated that the films
were uniform in thickness.