**5. Conclusions**

Our results have demonstrated that FIR should be considered as suitable stimuli to enhance nutraceutical compounds and preserved antioxidant properties in AGN powder. The optimum FIR condition obtained for AGN is at 220 ◦C for 30 min. A significant linear correlation was found between phenolic content and antioxidant properties of AGN. In the current study, only FIR temperature is optimized; however, duration of FIR treatment needs to be optimized in order to attain the highest content of nutraceutical properties from AGN powder.

**Author Contributions:** M.O.K.A., analyzed data and wrote the manuscript, J.P.P. performed the experiment, C.H.P. revised the manuscript and D.H.C. designed and supervised the study.

**Funding:** This study was supported by a research gran<sup>t</sup> from Kangwon National University, 2016. (Grant No. 520160107).

**Conflicts of Interest:** The authors declare no conflict of interest.
