Fig. 4From: Isolation of diterpenoids from sugi wood-drying byproducts and their bioactivitiesThe 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity of each purified diterpenoids. We adopted butylhydroxytoluene (BHT) as positive control. The sample concentration was 10 mM. n = 3. Error bars indicate standard deviation. Values with the same letters (a–h) showed no significant differences. Tukey–Kramer test, p < 0.05Back to article page