TPC, TFC, TAC of fresh and dried hawthorn fruit slices. TPC total phenol contents (g GAE/100 g DW), TFC total flavonoid contents (g RE/100 g DW), TAC total triterpenoid acid contents (g OAE/100 g DW), RF raw fresh fruit, HAD hot air drying, FD freeze drying, MD microwave drying, SND solar natural drying. Data are the mean of triplicates; vertical bars indicate standard error. Different letters within each bar indicate a significant difference (P < 0.05)