Polar Substances
Mostrando 1-12 de 39 artigos, teses e dissertações.
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1. PERFIL METABÓLICO DOS EXTRATOS POLARES DAS FOLHAS, GALHOS E CASCAS DE Copaifera multijuga HAYNE (COPAÍBA MARI-MARI DA AMAZÔNIA) POR ESI-EM
Copaifera multijuga Hayne is the main species of the genus in the Amazon region, being exploited for copaiba oil production mainly because of its therapeutic properties. The plant parts (leaves, branches, and barks) are widely used in folk medicine. However, they are little explored in terms of chemical composition. In this study, the polar extracts of leave
Quím. Nova. Publicado em: 2020-01
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2. PHENOLIC DERIVATIVES AND ANTIOXIDANT ACTIVITY OF POLAR EXTRACTS FROM Bauhinia pulchella
A tea made with the leaves or stem bark of Bauhinia pulchella Benth (Fabaceae) is used in the treatment of diabetes. Ethanol (EEF) and aqueous (EAF) extracts were obtained from the leaves and the antioxidant and citotoxic activities were tested, as well as quantify the content of flavonoids and phenolic compounds (TPC). EEF and EAF showed similar profiles by
Quím. Nova. Publicado em: 2018-04
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3. Hypolipidemic and antiatherogenic effects of Cynara scolymus in cholesterol-fed rats
ABSTRACT Cynara scolymus L., Asteraceae, are traditionally used to treat dyspepsia. This study evaluated the hypolipidemic and antiatherogenic effects of an aqueous extract prepared from the leaves of C. scolymus in rat's model. Hypercholesterolemic rats (1% cholesterol and 0.5% cholic acid for 15 days) were treated (0.5 ml/200 g) with extract of C. scolymus
Rev. bras. farmacogn.. Publicado em: 2016-04
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4. Response Surface Methodology Applied in the Study of Emulsion Formulations in the Presence of Leaves of Rosemary (Rosmarinus officinalis L.) as a Source of Natural Antioxidants
The use of synthetic antioxidants in human consuming products is in disuse due to health toxic related issues. The search for substances to substitute synthetic antioxidants boosts studies concerned with the findings of sources of natural antioxidants. Thus, the aim of this work was to evaluate the use of comminuted leaves of rosemary (Rosmarinus officinalis
J. Braz. Chem. Soc.. Publicado em: 2015-10
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5. Torularhodin and Torulene: Bioproduction, Properties and Prospective Applications in Food and Cosmetics - a Review
Torularhodin and torulene are two widespread microbial carotenoids with relatively few studies, as compared to other nutraceutical carotenoids such as β-carotene, lycopene and astaxanthin. Several genera of microorganisms produce it in high concentration (up to 0.1% of the cell dry weight), probably as a protection against photooxidation and free radicals.
Braz. arch. biol. technol.. Publicado em: 14/10/2014
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6. Effect of fertilisation and harvest period on polar metabolites of Calendula oficcinalis
The present study evaluated the chemical profile of polar extracts of Calendula officinalis L., Asteraceae, that were grown under different cultivation conditions: chemical fertilisation, organic fertilisation and mulching. Furthermore, we investigated metabolite variations during plant development by comparing the metabolites from harvested plants at 60 and
Rev. bras. farmacogn.. Publicado em: 2013-10
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7. Performance of predictive models in phase equilibria of complex associating systems: PC-SAFT and CEOS/GE
Cubic equations of state combined with excess Gibbs energy predictive models (like UNIFAC) and equations of state based on applied statistical mechanics are among the main alternatives for phase equilibria prediction involving polar substances in wide temperature and pressure ranges. In this work, the predictive performances of the PC-SAFT with association c
Braz. J. Chem. Eng.. Publicado em: 2013-03
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8. A simple procedure for the purification of active fractions in aqueous extracts of plants with allelopathic properties
Most studies conducted to test the allelopathic activity of plant parts have made use of water as solvent. However, the presence of polar, water-soluble substances, such as proteins and carbohydrates, tends to hamper the purification of active compounds. In this study, we present a simple purification procedure that separates the active fraction of the extra
Acta Bot. Bras.. Publicado em: 2013-03
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9. Grape juice and norbixin : in vitro in vivo antioxidant activity / Atividade antioxidante in vitro e in vivo de suco de uva e da norbixina
Epidemiological studies shown that the consumption of diets rich in plant foods and beverages is associated with reduction in the development of chronic-degenerative diseases. These foods are sources of substances such as carotenoids and polyphenols that can act as chemoprotectives agents, reducing the damage caused by reactive oxygen species, formed both in
Publicado em: 2008
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10. Aspectos químicos envolvidos nas interações de Citrus com fitopatógenos / CHEMICAL ASPECTS RELATED TO THE INTERACTION BETWEEN Citrus PLANTS AND PHYTOPATOGENIC FUNGI
This present thesis describes the development of analytical methodologies involving the HPLC-PDA-MS/MS coupling to verify the production of both polar and non-polar metabolites in orange trees produced by grafting Citrus sinensis onto Citrus limonea. By the use of such kind of method, it was possible to verify the production of both polymethoxy and glycosyl
Publicado em: 2007
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11. Desenvolvimento e validação de metodo analitico para a determinação de contaminantes volateis provenientes de embalagens de PET (polietileno tereftalato) e sua aplicação em PET pos-consumo. / Development and validation of an analytical method for the determination of volatile contaminants from PET (polyethylene terephtalate) packaging and its application in PET post-consumption.
The main approach of the present work was the development and validation of an analytical method for the determination of volatile contaminants from polyethylene terephthalate (PET) packaging, using the headspace dynamic concentration technique in the extraction stage and chromatographic techniques for identification and quantification. The method was valida
Publicado em: 2007
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12. Extracts of Azadirachta indica and Melia azedarach seeds inhibit folliculogenesis in albino rats
The seed oil of Azadirachta indica A. Juss (neem) is used in traditional medicine for its antidiabetic, spermicidal, antifertility, antibacterial, and wound healing properties. The present study was undertaken to investigate the quantitative aspects of follicular development in cyclic female albino rats (135 ± 10 g; 8 groups with 6 animals in each group) af
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-06