Detection of Irradiated Dried Cereals from Korea and China by Viscometric Method

국산 및 중국산 곡류(기장 및 수수)의 감마선 조사 여부 검지를 위한 점도측정

  • Published : 2001.12.01


A study was carried out to establish the detection method for irradiated cereals. Cereals were ground and irradiated at 2.5, 5.0, 7.5, 10, 15 kGy using a $Co^{60}$ irradiator. The viscosities decreased in all samples by increasing irradiation dose. The viscosity of the Panicum millaceum (Korean) and Andropogon sorghum (Korean) paste dropped from $143.38{\pm}0.44$ and $35.92{\pm}1.90$ in the control to $6.60{\pm}1.16$ and $3.86{\pm}0.32$, respectively, in the samples irradiated at 15 kGy. These trends were similar to samples from china. Regression equation and coefficients of viscosity of Panicum millaceum (Korean and China) and Andropogon sorghum (Korean and China) were 0.80 (y=-27.789x+150.17), 0.98 (y=-3.367x+88.93), 0.84 (y=-6.0466x+35.49) and 0.84 (y=-13.346x+101.67) at 50 rpm. All samples resulted in a decrease in specific parameter by increasing rpm after irradiation. Parameter values showed dose-dependent relationship between unirradiated and irradiated samples and indicated that all values of unirradiated samples were higher than the irradiated ones. These results suggest that the detection of irradiated cereals at various doses using viscometric methods is possible.