Antioxidant Properties of Polyphenolic Extracts from Quercus Laurina , Quercus Crassifolia , and Quercus Scytophylla Bark

• Published in: Antioxidants 2018-06, Vol.7 (7), p.81
• Main Authors: Valencia-Avilés, Eréndira, García-Pérez, Martha Estrella, Garnica-Romo, Ma Guadalupe, Figueroa-Cárdenas, Juan de Dios, Meléndez-Herrera, Esperanza, Salgado-Garciglia, Rafael, Martínez-Flores, Héctor E
• Format: Article
• Language: English
• Subjects: oak bark; polyphenols; Quercus; scavenging ability
• ISSN: 2076-3921; 2076-3921
• DOI: 10.3390/antiox7070081

The objective of this work was to determine the concentration of total phenols, total flavonoids, hydroxycinnamic acids, and proanthocyanidins present in crude extracts of , , and bark. They were extracted by ethanol (90%) maceration and hot water. The antioxidant capacity was determined by the ability to capture OH*, O₂* , ROO*, H₂O₂, NO*, and HClO. The hot water crude extract of was chosen to be concentrated and purified due to its higher extraction yield (20.04%), concentration of phenol compounds (747 mg gallic acid equivalent (GAE)/g, 25.4 mg quercetin equivalent (QE)/g, 235 mg ChAE/g, 25.7 mg chlorogenic acid equivalents (ChAE)/g), and antioxidant capacity (expressed as half maximal effective concentration (EC , µg/mL): OH* = 918, O2* = 80.5, ROO* = 577, H₂O₂ = 597, NO* ≥ 4000, HClO = 740). In a second stage, extracted with hot water was treated with ethyl acetate, concentrating the phenol compounds (860 mg GAE/g, 43.6 mg QE/g, 362 ChAE/g, 9.4 cyanidin chloride equivalents (CChE)/g) and improving the scavenging capacity (OH* = 467, O2* = 58.1, ROO* = 716, H₂O₂ = 22.0, NO* ≥ 4000, HClO = 108). had the highest polyphenolic concentration and the better capacity for scavenging reactive species, being a favorable candidate to be considered in the development of new products.