A preliminary study has been conducted on the Physicochemical properties of irradiated cocoa beans. Polyethylene (PE) plastic was used to pack dried cocoa beans. After that, samples were vacuumed and irradiated using the gamma rays at the levels dose of 2 kGy, 4 kGy, and 6 kGy as well as non-irradiated used as control. Physico-chemical properties were tested, including water content, pH, water activity (Aw), protein, fat, and polyphenols of irradiated cocoa beans, immediately after the irradiation process. The examination results revealed that moderate doses of 2 kGy up to 6 kGy did not affect the moisture content, pH, water activity (Aw), protein, and fat content of cocoa beans, whereas the polyphenol content tends to increase. Therefore, the moderate levels dose of irradiation 2 kGy up to 6 kGy can maintain the quality of cocoa beans such as moisture content, pH, water activity (Aw) as well as protein and fat content, whereas polyphenols content was increased. Further investigation is needed on the effect of gamma irradiation on the physicochemical properties of other cocoa beans and the microbiological properties and storage time.

This study was aimed to investigate the meatballs physical qualities that are irradiated with high-doses of gamma rays. This study used the irradiation method with the dosage of 20, 25 and 35 kGy and storage at room temperature. For the control (0 kGy), storage was done in the freezer. The results showed that at 0 month, the samples water contents at 20; 25; 35 kGy were 67,03%; 67,50%; 66,67%, with significant difference (p<0.05) to control 68,73%. Water content (%) at 2 months were 65,03%; 66.00%; 67.50% and control 63,23% 2 months has significant difference (p<0.05) but still meet the SNI standard (<70%). Optimum water activity was obtained at irradiation dose of 35 kGy. The pH results doses of 20; 25; 35 kGy for 0 month were 6,35; 6,34; 6,39 and 2 months were 6,59; 6,47; 6,46, respectively. pH of control was 5,87 at 0 month and 6,49 at 2 months. The pH of samples stored for 0 month were relatively higher than the control pH. At 2-month storage, the pH of the samples was lower than the control, but still meets the standard. Meatball irradiation up to 35 kGy can be used as an alternative for preservation at room temperature.