| Abstrakt: |
Purpose: The Mediterranean basin's abundance of oak trees yields a considerable quantity of acorns in the woodlands each year. Methods: This study evaluates and compares the physicochemical, nutritional, and antioxidant activities of acorns from four Quercusspecies: two Algerian varieties, Quercus suberand Quercus ilex(QSA, QIA), and two Tunisian varieties, Quercus suberand Quercus ilex(QST, QIT). Results: For the Algerian varieties the physicochemical compositions, phytochemical compositions, and antioxidant capacity are as follows: total sugars (76.01–52.78%), proteins (7.70–6.72%), fat (13.95–4.15%), total phenolic (516.36–397.79 mg GAE/g DM), condensed tannins (4.64–6.05 mg CE/g DM), (DPPH IC50= 0.01–0.015 mg/mL, ABTS IC50= 0.008–0.02 mg/mL, FRAP = 798.5–123.3 mmol Fe(II)/mL DM, and TAC = 38.1–21.8 mmol AAE/mL DM), respectively in Quercus suberand Quercus ilexspecies. However, corresponding values the Tunisian varieties were as follows: total sugars (59.62–64.22%), proteins (5.01–7.58%), fat (8.05–5.23%), total phenolic (287.23–460.91 mg GAE/g DM), condensed tannins (5.34–6.78 mg CE/g DM), (DPPH IC50= 0.013–0.02 mg/mL, ABTS IC50= 0.016–0.014 mg/mL, FRAP = 68.4–133.3 mmol Fe(II)/mL DM, and TAC = 13.7–22.3 mmol AAE/mL DM), respectively in Quercus suberand Quercus ilex species. According to Principal Component Analysis, the Quercus SuberAlgerian (QSA) displays distinct characteristics compared to other Quercusspecies. These findings suggest that an excellent source of naturally occurring physicochemical and bioactive compounds is the acorn oak tree. Conclusion: This study makes a significant contribution to acorn valorization. New uses for these acorn extracts, such as in the nutraceutical or food industries, may be explored. |
Full text from SpringerLink