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.

PeakCompoundsRetention time (min)Ultrasound-assisted extraction (UAE; mg/100 g)Soxhlet extraction (SE; mg/100 g)Maceration extraction (ME; mg/100 g)

1Catechol3.54
22,3-Dihydro-benzofuran4.95
3p-Hydroxybenzoic acid12.56
4Gentisic acid13.89
5Gallic acid14.09
6Vanillic acid14.38
7Benzaldehyde, 2-hydroxy-4-methyl14.94
8Catechin16.01
9Gallocatechin17.31
10Coumaroylquinic acid18.32
11Quinic acid19.14
12Quercetin20.11

Different letters in the same row indicate statistically significant differences between treatments (). The values are of duplicate runs.