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Open AccessArticle

Chemical Composition, In Vitro Antioxidant Potential, and Antimicrobial Activities of Essential Oils and Hydrosols from Native American Muscadine Grapes

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Laboratory of Applied Biotechnology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 139 Ruski Blvd., 4000 Plovdiv, Bulgaria
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Center for Viticulture and Small Fruit Research, College of Agriculture and Food Science, Florida A&M University, Tallahassee, FL 32317, USA
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Food Science Program, College of Agriculture and Food Sciences, Florida A&M University, Tallahassee, FL 32307, USA
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AgroBioInstitute Agricultural Academy, 8 Dr. Tsankov Blvd., 1164 Sofia, Bulgaria
5
Department of Biochemistry and Microbiology, Faculty of Biology, Plovdiv University “P. Hilendarski”, 4000 Plovdiv, Bulgaria
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(18), 3355; https://doi.org/10.3390/molecules24183355
Received: 12 August 2019 / Revised: 11 September 2019 / Accepted: 12 September 2019 / Published: 15 September 2019
(This article belongs to the Section Natural Products Chemistry)
Essential oils and hydrosols of two cultivars of muscadine grapes (Muscadinia rotundifolia (Michx.) Small.) were obtained by hydro-distillation of flowers and berry skins. Twenty-three volatile compounds were identified in essential oils from the muscadine flowers, and twenty volatiles in their corresponding hydrosols. The composition of volatiles in berry skins differed significantly from that of the vine flowers. The antioxidant potential of investigated essential oils and hydrosols was evaluated using five in vitro assays: DPPH (2,2-diphenyl-1-picrylhydrazyl) method, TEAC (Trolox equivalent antioxidant capacity), FRAP (Ferric reducing antioxidant power), CUPRAC (cupric ion reducing antioxidant capacity), and NO (nitric oxide radical scavenging assay). The essential oils from the flowers of both cultivars showed the strongest antioxidant power, whereas the hydrosols were the significantly less active. All investigated essential oils showed very weak antibacterial activities against Bacillus cereus, Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. However, the essential oils from the flowers of both cultivars showed moderate antifungal activities against Candida albicans, which were stronger for the oil from “Carlos” (white muscadine cultivar). To the best of our knowledge, this is the first report on obtaining and characterizing essential oils and hydrosols from muscadine grapes. This study demonstrated the variations in aromatic compounds accumulated in flowers and mature berry skins of muscadine grapes, and evaluated their possible antioxidant and antimicrobial activities. The presented results will be the base for future research, focused on a better understanding of the molecular and regulatory mechanisms involved in aromatic compound biosynthesis and accumulation in muscadine grapes. View Full-Text
Keywords: Vitis rotundifolia Michx.; volatile compounds; grape skins; antifungal activity Vitis rotundifolia Michx.; volatile compounds; grape skins; antifungal activity
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MDPI and ACS Style

Georgiev, V.; Ananga, A.; Dincheva, I.; Badjakov, I.; Gochev, V.; Tsolova, V. Chemical Composition, In Vitro Antioxidant Potential, and Antimicrobial Activities of Essential Oils and Hydrosols from Native American Muscadine Grapes. Molecules 2019, 24, 3355.

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