Table 5. Qualitative and quantification of phenolic acid using HPLC in 100% ethanol extracts from apple flowers with the different drying conditions (254 nm)

Drying conditions Sample flower names Cinnamic acid2) m-Coumaric acid Syringic acid Vanillic acid 4-Hydroxy benzoic acid SUM
Hot air drying (HD) ‘Hongno’1) 210.23) 2.1 7.5 0.5 - 220.3
‘Aori’ 212.7 22.1 8.7 - - 243.5
‘Fuji’ 143.4 16.4 7.9 - - 167.7
‘Jonathan’ 143.6 25.0 10.5 1.2 - 180.3
‘Myanmar’ 121.0 20.6 6.5 - - 148.1
Freeze drying (FD) ‘Hongno’ 231.9 141.4 4.8 - - 378.1
‘Aori’ 269.2 217.2 7.8 - - 494.2
‘Fuji’ 216.4 110.2 13.3 2.5 - 342.4
‘Jonathan’ 163.9 129.1 12.7 1.5 - 307.2
‘Myanmar’ 229.0 91.6 8.4 2.4 - 331.4
Each sample concentration was 2 mg/mL.
Each sample standard was 0.2-300 mg/kg.
Units was mg/kg.