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- Title
Effect of cooking on functional properties of germinated black glutinous rice (KKU-ULR012).
- Authors
Konwatchara, Thapanan; Ahromrit, Araya
- Abstract
The aim of this research was to investigate the changes in functional properties of germinated black glutinous rice (KKU-ULR012) after cooking. Black glutinous rice grains were obtained from Faculty of Agriculture, Khon Kaen University, Thailand. The rough grains were soaked for 12 hrs, then germinated for 30 hrs at 35±2°C (95%RH), dried at 45±2°C for 8 hrs, dehusked and cooked either using a microwave oven or a pressure cooker. The cooked grains were dehydrated in two stages, 85±2°C for 1 hr and 45±2°C for 12 hrs until the final moisture content was 10±2%wb. The antioxidant activity, anthocyanins, GABA and γ-oryzanol contents, and the microstructure of the dehydrated grains were then characterized. Germination process induced a 2.55 fold increase in GABA content compared to non-germinated KKU-ULR012. The germinated KKU- ULR012 gave DPPH value, anthocyanins and γ-oryzanol contents of 33.74±0.15 mgTrolox/100gdb, 182.89±0.48 mg/100gdb and 37.72±0.16 mg/100gdb, respectively. Anthocyanins in cooked germinated KKU-ULR012 diminished almost 88-89% after cooking. The cooking methods employed strongly influenced the antioxidant activity and anthocyanins content that the pressure cooking tended to prevent loss of anthocyanin content and antioxidant activity. The GABA, γ-oryzanol and anthocyanins contents and antioxidant activity of germinated grains cooked in the pressure cooker were higher than the samples cooked in the microwave oven (p<0.05). For pressure cooking, the cooked grains gave DPPH, ABTS, anthocyanins and γ-oryzanol contents of 9.89±0.35 mgTrolox/100gdb, 1.79±0.04 mgTrolox/100gdb, 21.60±0.14 mg/100gdb and 37.16±0.70 mg/100gdb, respectively. The rice grains cooked by pressure cooking were more moist and sticky than the grains cooked by microwave cooking. The microstructure examined by SEM showed that the center of the dehydrated cooked rice grain was smooth indicating starch gelatinization whereas the surface revealed fission of the grain. This study found that germinated KKU-ULR012 cooked by the pressure method can be one of the native rice varieties that possess a potent source to enhance GABA and γ-oryzanol contents as well as antioxidant activity.
- Subjects
RICE; GERMINATION; KHON Kaen University (Khon Kaen, Thailand); MICROWAVE ovens; PRESSURE cooking; ANTIOXIDANTS; COOKING
- Publication
Songklanakarin Journal of Science & Technology, 2014, Vol 36, Issue 3, p283
- ISSN
0125-3395
- Publication type
Article