Judul: Pengaruh Iradiasi Gamma (60Co) dengan Berbagai Laju Dosis pada Senyawa Antigizi (Asam Fitat, Antitripsin), Isoflavon dan Warna Kacang Kedelai (Glycine max L.).
Abstrak: Research on the influence of gamma irradiation at different dose-rate on the anti-nutrient compound (phytic acid, anti-trypsin), isoflavones and color of soybean (Glycine max L.) has been done. The application of irradiation techniques on food products are frequently focused on the influence of radiation dose and the change of nutrient and anti-nutrient compounds as well as the quality of products. Gamma irradiation influence on the same dose, but with a variety of dose rates, especially on anti-nutrient compounds, isoflavone and color on soybean, has not been done. The change of anti-nutrient compound, isoflavone and color on soybean caused by irradiation were studied on a variety of dose-rate combinations (kGy/h) and different irradiation time (h). The purpose of this research was to study the effects of combination treatment between dose-rate (kGy/h) and irradiation time (h) or duration on the effectiveness of irradiated soybean, especially on the changes of its anti-nutrient compound, isoflavones and color. Radiation process parameter; (dose-rate and time in combination) for a control with the purpose to prove that irradiation on the same certain dose would have resulted different product quality if it had been done with different dose-rates and time. Furthermore, combination treatment between irradiation at higher dose-rate and shorter time could degrade anti-nutrient compound and resulted more minimum influence to the damage of brightness quality (color) than irradiation in lower dose-rate and longer time. This research was primarily focused on 3 (three) activities. The first step was to study the effect of gamma irradiation (60Co) at different dose-rate on the anti-nutrient compound (phytic acid and antitrypsin) and color on soybean. The second step of the research was to study the effects of gamma irradiation at different combination of dose-rate and time of exposure on the isoflavones contents of soybean. The third step of the research was a verification of the first and the second steps, namely: to study the effect of gamma irradiation on the low and high dose at different combination of dose-rate and time on phytic acid and color of soybean. In the previous research, the characterization of gamma radiation source capacity to determine dose map and dose-rate on irradiation area has been done. There were 4 (four) dose-rate locations which has been identified in the irradiation area; each of them was 1.30; 3.17; 5.71 and 8.82 kGy/h. The rasio of maximum and minimum dose (Dmax/Dmin) ranging from 1.14 to 1.21. Furthermore, the four location points of dose-rate were used for main research. The effect of gamma irradiation (60Co) at different dose-rate on the anti-nutrient compound (phytic acid and antitrypsin) and color on soybean. Gamma irradiation on soybean was done with dose rates of 1.30; 3.17; 5.71 and 8.82 kGy/hour, respectively. Irradiation treatment condition for each samples was done at room temperature (28 ± 2 °C) ranging from 0.5 h to 55 h; depending on its dose rates. The purpose of this study was to investigate the influence of dose rate on the changes of anti-nutrient compound concentration and color (brightness) on soybean during radiation process. The results showed that k-value (degradation rate constant) gained to be
Keyword: gamma irradiation, dose-rate, soybean, phytic acid, anti-trypsin, isoflavone, color