• The guideline on OPB drying by convection and microwave drying technique was investigated.
• The drying condition would affect wood of property in OPB.
• Relative of drying condition the effect of SAC and NRC in OPB.
• Choosing on suitable drying condition would not affect antioxidant activity.
• HPRY could be increased with increasing of the degree of starch gelatinization.