Browsing by Author "Viteri Espinoza, Rafael Antonio"

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    Bioactive compounds in Apis mellifera monofloral honeys
    (2021) Viteri Espinoza, Rafael Antonio; Zacconi, Flavia C. M.; Montenegro Rizzardini, Gloria; Giordano Villatoro, Ady Iveth
    Honey is a natural product with a sweet flavor. Honey is made by the honeybee (Apis mellifera L.) from the nectar of flowers or other plant secretions that are collected near the hive. These products are mixed with bee saliva and stored. Several studies have demonstrated that honey exhibits antioxidant, antimicrobial, nematicidal, antifungal, anticancer, and anti-inflammatory activities. These properties are influenced by the plants from which the secretions are harvested, from the naturally occurring compounds present in the nectar. Studies of the properties and applications of honey have distinguished honey from other natural products due to the presence of certain compounds and due its bioactive properties. The focus of this review is to discuss the identified and isolated compounds from monofloral honey produced by A. mellifera, with specific emphasis on antioxidant and antimicrobial properties of honey and its therapeutic health benefits.
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    Flavonoids and triterpenes isolated from Eucryphia cordifolia (Cunoniaceae)
    (2022) Viteri Espinoza, Rafael Antonio; Giordano Villatoro, Ady; Montenegro Rizzardini, Gloria; Zacconi, Flavia C. M.
    The phytochemical study of the leaves of Eucryphia cordifolia (Cunoniaceae) allowed for the isolation of six compounds: the triterpenes betulin (1) and 28-acetoxy betulin (3), the steroid β-sitosterol (2), the flavonol quercetrin (4), the flavanonol astilbine (5) and the flavanol catechin (6). The structures of the isolated compounds were clearly assigned through 1D and 2D-NMR, MS studies, and compared to previously described data. This is the first report on the isolation of compounds 1–4 and 6 from the genus Eucryphia. The chemotaxonomic importance of the isolated compounds within the family of Cunoniaceae-related plants is discussed.