The essential oil composition of the Ocotea bicolor, native plant of Brazil, was studied for the first time. The essential oil of the leaf was obtained by hydrodistillation and analyzed by GC/MS. The analytical procedure revealed a predominance of sesquiterpenes, δ-cadinene (7.39%), β-sesquiphellandrene (6.67%), β-elemene (5.41%) and α-cadinol (5,23%). The essential oil was submitted to brine shrimp toxicity evaluation, antioxidant and antibacterial tests. The antioxidant activity by the formation of phosphomolybdenum complex method presented positive results. The minimum inhibitory concentration (MIC) values were higher than 1000 μg/mL for the microorganisms tested. Toxicity activity revealed LC50 results of 40.10 (μg/mL), being toxic to the organisms in this study.
The chemical composition of the essential oil of aerial parts of Croton glandulosus Linnaeus was evaluated by GC-MS. The phytotoxicity assay over Lactuca sativa seeds was evaluated for the first time. The yield of extraction of the essential oil obtained was 0.12% (v/w) and the chromatographic analysis allowed the recognition of 97.49% of the total compounds. Sesquiterpenes are predominant as constituents of the volatile oil, in which β-caryophyllene (53.24%) is the major compounds.Concentrations of the oil from 0.1% up to 1% (v/v) reduced the development of hypocotyl and radicle of L. sativa.
In an effort to identify novel biopesticides, the present study aimed to assess the effects of Philodendron meridionale (Buturi & Sakur) stem and leaf ketonic and ethanolic extracts (SKE, SEE, LKE, and LEE, respectively) on the germination, growth, root respiration, and enzymatic activities of Lactuca sativa L. seeds, and to measure the associated saponins, phenolics, and flavonoids that may possess herbicidal, pharmaceutical, or pesticidal activities. The extracts were obtained using a modified Soxhlet apparatus and methanolic extracts of 0.1, 0.25, 0.5, 0.75 and 1.0 mg.mL-1 were tested, with water and methanol as a control. The presence of saponins and the concentration of phenolic compounds were determined. Allelopathic activity was evaluated in tests of germination, growth, cellular respiration and enzymatic activity. The presence of saponins and the concentration of phenolic compounds equivalent to 225.12 for LKE, 240.45 for LEE, 193.28 for SKE, and 265.14 for SEE (mg·g-1.gallic acid), and flavonoids 52.74 for LKE, 54.31 for LEE, 72.74 for SKE, and 67.21 for SEE (mg.g-1.quercetin) were determined. The allelopathy of the P. meridionale extracts against L. sativa was confirmed through negative effects on L. sativa seed germination, radical growth and morphology, dry mass, and the concentrations of α-amylase (EC 3.2.1.1), ascorbate peroxidase (EC 1.11.1.11), catalase (EC 1.11.1.6), and polyphenol oxidase (EC 1.10.3.1). It was likely that the allelopathic action of the P. meridionale extracts was related to its effects on the membrane permeability and oxidative stress of the treated L. sativa seeds. The P. meridionale extracts contained saponins, calcium oxalate crystals, and flavonoids, including phenolic compounds, which are known allelochemicals with herbicidal activities.
O uso de fibras na composição de produtos de panificação tem motivado diversos estudos neste setor. Aliado a isso, o enriquecimento de alimentos através de subprodutos do processo industrial além de agregar valor ao produto, contribui para inclusão de nutrientes essenciais ao consumo humano. Neste sentido, o objetivo deste estudo foi a elaboração de pão com incorporação de 5, 10 e 15% de farinha da casca de maracujá (FCM) e avaliar suas características físicas e sensoriais. A análise sensorial foi realizada de acordo com os métodos descritos no Instituto Adolfo Lutz, utilizando a escala hedônica de 9 pontos, e as análises físicas conforme procedimentos descritos no macro método 10-50 d da AACC. As amostras não diferiram significativamente p ≤ 0,05 nos atributos aroma, aparência e textura. Pães elaborados com 5 e 10% de FCM, foram os mais aceitáveis para os atributos analisados. Quanto a intenção de compra, foi positiva para o pão com menor percentual de FCM. Não houve diferença significativa entre as amostras analisadas na caracterização física. Dessa forma, a análise física e sensorial permite afirmar que o acréscimo de até 10% de FCM em pães é viável, sem afetar suas características físicas e sensoriais, constituindo-se, portanto, como produto alimentício fonte de fibras. Além disso, o uso da FCM contribui para redução de impactos ambientais causados por subprodutos agroindustriais.
The species Tynanthus micranthus Corr. Méllo, is popularly known as "Cipó Cravo" or "Craveiro", and is usually used as a stimulant and aphrodisiac, and found in the north of the State of Paraná - Brazil. The isolate the alkane dotriacontane from T. micranthus and to verify its action on the activation of human neutrophils to produce superoxide anions by the nitroblue tetrazolium reduction method (NBT), in comparison with the activation obtained by commercial dotriacontane. The ethanolic extract dried leaves was prepared by modified Soxhlet apparatus. Then the ethanolic extract was fractionated with n-hexane to obtain the hexane fraction which was submitted to the chromatographic column to obtain the compound dotriacontane. The substance was identified by 1H and 13C NMR spectroscopy. Isolated and commercial dotriacontane were evaluated by the NBT assay for verification of the activation of human neutrophils. The isolated and commercial dotriacontane activated neutrophils (10.0 μg/mL) when compared to phorbol myristate acetate (PMA) (10.0 μg/mL). In the quantitative test commercial dotriacontane induced significant activation when compared to PMA (10.0 μg/mL). The substance dotriacontane, first time identified in the genus Tynanthus. The dotriacontane was shown to be important to confirm the activation of human neutrophils to produce superoxide anions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.