The aim of this study was to investigate the effect of far infrared irradiation (FIR) on\nnutraceutical compounds, viz. total phenolic content, total flavonoids, and antioxidant capacity,\nof Angelica gigas Nakai (AGN). The FIR treatment was applied for 30 min with varied temperatures\nof 120, 140, 160, 180, 200, 220, and 240 Degree Centigrade. Results showed that FIR increased total phenolic and\nflavonoid content in AGN at 220 Degree Centigrade. The HPLC results revealed higher quantities of decursin\n(62.48 mg/g) and decursinol angelate (41.51 mg/g) at 220 Degree Centigrade compared to control (38.70 mg/g,\n27.54 mg/g, respectively). The antioxidant capacity of AGN was also increased at 220 Degree Centigrade, as measured\nby 1,1-diphenyl-2-picrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP), and the\nphosphomolybdenum (PPMD) method. A further increase of the FIR temperature caused a reduction\nof compound content. In addition, the results also showed a strong correlation between phenolic\ncontent and antioxidant properties of AGN powder. These findings will help to further improve the\nnutraceutical profile of AGN powder by optimizing the FIR conditions.
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