Abstract:
To characterize the dentin matrix extracted from human teeth (DME) and develop a controlled release system from gelatin/Thai silk fibroin (G:SF) to be used as carrier for DME. The carriers were produced by weight blending ratio of G:SF 100:0, 70:30, and 50:50. These carriers was designed to interact with DME by the opposite electrostatic charge and provide sustain releasing by biodegradation. The yield of extraction is 0.388% by weight. Molecular weights of extracted crude proteins are in the range of 55-72 kDa which could be assumed as acidic matrix proteins. The zeta-potential of DME are -10.53 ± 0.12 and -13.53 ± 0.31 mV in pH 7.5 and 5.5 solutions, respectively. The results of in vitro cell culture using MC3T3-E1 cell line indicated that DME suppressed specific growth rate of the cell. However, 100 µg/ml of DME significantly enhanced the osteogenic differentiation as evaluated from ALP activity at day 10 and calcium deposition at day 21. The G:SF carriers, which produced by weight blending ratio of 100:0, 70:30, and 50:50, weighed 13.28 ± 0.50, 12.86 ± 0.56 and 11.36 ± 0.63 mg, respectively and showed a burst releasing of DME around 12.93 ± 7.84 to 21.42 ± 1.18 in PBS. In vitro release experiment of DME from these carriers for 48 hours showed controlled-release pattern. The increasing of Thai silk fibroin blending amount resulted in the decreasing of degradation rate of the carriers. The slowest releasing pattern of DME could be observed in a G:SF 50:50 scaffold, therefore, this ratio had been assumed to be the best scaffold interacted with DME. The results indicated that G:SF carriers had a high potential to be applied in DME controlled release applications.