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.