Research Article
Optimization Conditions of Ultrasound-Assisted Extraction for Phenolic Compounds and Antioxidant Activity from Rubus alceifolius Poir Leaves
Table 4
Chemical compounds of R.A. Poir leaf extract.
| Peak | Compounds | Retention time (min) | Ultrasound-assisted extraction (UAE; mg/100 g) | Soxhlet extraction (SE; mg/100 g) | Maceration extraction (ME; mg/100 g) |
| 1 | Catechol | 3.54 | | | | 2 | 2,3-Dihydro-benzofuran | 4.95 | | | | 3 | p-Hydroxybenzoic acid | 12.56 | | | | 4 | Gentisic acid | 13.89 | | | | 5 | Gallic acid | 14.09 | | | | 6 | Vanillic acid | 14.38 | | | | 7 | Benzaldehyde, 2-hydroxy-4-methyl | 14.94 | | | | 8 | Catechin | 16.01 | | | | 9 | Gallocatechin | 17.31 | | | | 10 | Coumaroylquinic acid | 18.32 | | | | 11 | Quinic acid | 19.14 | | — | — | 12 | Quercetin | 20.11 | | | |
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Different letters in the same row indicate statistically significant differences between treatments ( ). The values are of duplicate runs. |