Grapevine leaves (Vitis vinifera): Chemical characterization of bioactive compounds and antioxidant activity during leave development. (December 2022)

• Record Type: Journal Article
• Authors: Nzekoue, Franks Kamgang; Kouamo Nguefang, Manuella Lesly; Alessandroni, Laura; Mustafa, Ahmed M.; Vittori, Sauro; Caprioli, Giovanni
• Is Part Of: Food bioscience. Volume 50:Part B(2022)
• Publication Date: 2022-12
• Subjects: Grape leaves -- Polyphenols -- Carotenoids -- Tocopherols -- Phytosterols -- Antioxidants -- Waste valorization; Food -- Biotechnology -- Periodicals; Food -- Research -- Periodicals; Aliments -- Biotecnologia -- Revistes; Aliments -- Investigació -- Revistes; Food -- Biotechnology; Food -- Research; Revistes electròniques; Periodicals; 664.005
• DOI: 10.1016/j.fbio.2022.102120
• Languages: English
• ISSNs: 2212-4292

Abstract

Abstract: Leaves from Vitis vinifera L. represent the less studied and valorized wastes of grape crops and the winery industry. This study aims thus to perform for the first time a deepened assessment of the bioactive compounds in grapevine leaves. The detailed composition of main phytochemicals involved in the high antioxidant of grape leaves (2.20 g TE/100 g) was determined including carotenoids (lutein, β-carotene), tocopherols (α and ɣ-tocopherol), polyphenols (phenolics acids, flavonoids), and phytosterols (β-sitosterol). In particular, high levels of lutein (0.3–1.0 g/kg) and α-tocopherol (0.2–1.2 g/kg) were observed. Moreover, the evolution of bioactive compounds during 7 harvesting times from July to October was also studied showing that the content of phytochemicals fluctuates according to the development stage of grape leaves. Phytosterols for example reached their highest levels in leaves in the later stage of maturation (T6 – T7) with values around 169 ± 40 mg/kg. Graphical abstract: Image 1 Highlights: Grapevine leaves a high source of bioactive compounds with antioxidant activity. α-tocopherol levels increased from July (T1) to October (T7) (0.36–1.83 g/kg fw). Lutein is the main carotenoid with max levels in August (0.8–0.9 g/kg fw). High in phytosterols (101–187 mg/kg fw) and polyphenols (1.5–1.8 g GAE/kg fw). Grape leaves can be upcycled for the production of antioxidant ingredients.