Abstract:
This research was aimed to study the effect of high-temperature on gamma-amino butyric acid (GABA) content, volatile components, physicochemical, and sensory properties of germinated brown rice (GBR), and to study the changes of cooked GBR in retort pouch during storage. The GBR was cooked and sterilized at 115, 118 and 121 oC (F0 = 4 minutes). It was found that the highest GABA content was observed in cooked GBR at 121 oC. The results from cooking quality test showed that color, whiteness index (WI) and hardness of the cooked GBR at 115 and 118 oC were not different. However, the cooked at 118 oC GBR showed better appearance (thoroughly cooked, not hard or mushy) compared to other conditions. From the storage test of the GBR cooked at 118 oC for 6 months, it was evident that the GABA content and WI decreased but the hardness increased (p≤0.05) with storage time. From the study of volatile components and their contents using gas chromatography-mass spectrometry (GC-MS) technique, it was found that hexanal (green, grass like odor) increased during storage, while dimethyl sulfide (cooked corn odor) decreased significantly (p≤0.05). The sensory study showed that the intensity of color, rancid odor and hardnesssoftness scores were increased, whereas the cereal-like odor was decreased (p≤0.05) during storage.