Navegando por Assunto "Piperaceae"

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Acesso aberto (Open Access)
Avaliação da atividade antinociceptiva e anti-inflamatória da Pellucidina A e elucidação do mecanismo de ação em modelos in vivo
(Universidade Federal do Pará, 2016-10-13) QUEIROZ, Amanda Pâmela dos Santos; MAIA, Cristiane do Socorro Ferraz; http://lattes.cnpq.br/4835820645258101; BASTOS, Gilmara de Nazareth Tavares; http://lattes.cnpq.br/2487879058181806
The Peperomia pellucida (Piperaceae) is an herbaceous plant commonly found in the American and Asian continents. In the Amazon the species is known by the name of erva-de-jabuti. This plant is used in folk medicine to treat a wide range of symptoms and diseases such as conjunctivitis, headache, asthma, gastric ulcer, inflammation and arthritis. Pellucidin A is an isolated compound of the species Peperomia pellucida and this study aimed to analyze the antinociceptive and anti-inflammatory activity of this compound, as well as to elucidate its mechanism of action. For the assays, male albino mice (25-40 g) were used, which were initially treated with pellucidin A at the doses of 0.5; 1 and 5 mg / kg (i.p.) and subjected to locomotor evaluation by the open field test and animal models of acute pain, such as acetic acid-induced abdominal writhing tests, formalin tests and the hot plate test. The acetic acid-induced abdominal contortion test was realized to elucidate the mechanism of action in which the animals were treated at the standard dose of 5 mg/kg (i.p.) and for anti-inflammatory analysis of the compound was used model of granuloma induced by pellets of cotton, in which the animals were treated in the dose of 10 mg/kg (i.p.). The compound did not show capacity to change the ambulation of the animals at any of the administered doses. In the contortion test, pellucidin A was able to inhibit the number of abdominal writhings in 43% at the dose of 1 mg/kg, and 65% at the dose of 5 mg/kg. In the formalin test, an antinociceptive effect was observed at the dose of 5 mg/kg, with a 68% reduction in the lymph time of the animal's paw in the inflammatory phase, showing a similar response to Indomethacin used at a dose of 10 mg/kg as positive control for this phase. Animals treated with pellucidin A and subjected to the hot plate assay did not show any change in their latency time on the plate, showing a similar response to the animals treated just with the vehicle solution. For the elucidation of the action mechanism, the pellucidin A was administered at the standard dose of 5 mg/kg (i.p.) and associated with Indomethacin (5 mg/kg i.p.), NS-398 (10 mg/kg i.p.) cyproeptadine (0.5 mg/kg i.p.), naloxone (1 mg/kg i.p.) and L-NAME (5 mg/kg i.p.). The pellucidin A has shown a synergistic action when associated with cyproeptadine and L-NAME, with a decrease in the pattern of abdominal writhing by 97% when associated with cyproheptadine and 96% with L-NAME. In the analysis of the action of pellucidin A (10 mg/kg i.p.) in the granuloma test induced by cotton pellets, pellucidin A presented anti-inflammatory activity, reduced granuloma formation in 24% in the treated mice. The results confirm the hypothesis that pellucin A presents analgesic activity capable of interfering in the inflammatory process, acting as a possible glucocorticoid agonist.
Acesso aberto (Open Access)
Avaliação de minerais em plantas medicinais amazônicas
(2009-06) MARTINS, Alexsandro Sozar; ALVES, Claudio Nahum; LAMEIRA, Osmar Alves; SANTOS, Alberdan Silva; MÜLLER, Regina Celi Sarkis
The Amazonian Brazilian offers an appreciable potential of plants with therapeutic properties, although most are little known. In this way, with the objective of verifying the potentiality nutritional of medicinal herbs, a work was developed to determine the concentration of Ca, Mg, Fe, Cu and Zn in the leaves and in the teas of these species: Piper callosum Ruiz & Pav., Piperaceae, Mikania lindleyana DC., Asteraceae e Arrabidaea chica (Humb. & Bonpl.) B. Verl., Bignoniaceae. After the plants samples have been processed, they were submitted to digestion and soon afterwards the metals were analyzed in an spectrophotometer of Atomic Absorption. The results showed the follow yields: for the tea of Arrabidaea chica Ca were detected (6955 to 20058 mg/L), Mg (2390 to 3094 mg/L) and Fe (40 to 61 mg/L). For the tea of Mikania lindleyana besides the presence of high values of Ca (17722 to 22336 mg/L), Mg (4531 to 9370 mg/L) and Fe (20 to 87 mg/L) they were found from 7 to 16 mg/L of Cu and 9 to 41 mg/L of Zn. The tea of the Piper callosum presented 2036 to 4344 mg/L of Ca, 618 to 4023 mg/L of Mg and 39 to 60 mg/L of Fe. Being compared the results of the minerals with the values recommended by the Health World Organization, is possible that the present metals in the teas of the plants could contribute in the complementation of the people's alimentary diets that use these medicinal plants.
Acesso aberto (Open Access)
Avaliação toxicológica do óleo essencial de Piper aduncum L.
(2008-06) SOUSA, Pergentino José da Cunha; BARROS, Carlos Augusto Lima; ROCHA, José Carlos da Silva; LIRA, Denisléia Sertão; MONTEIRO, Gisele Muniz; MAIA, José Guilherme Soares
The aim of this work was the acute and subacute toxicological evaluation of the essential oil of Piper aduncum with the determination of the LD50 in mice and the analysis of their hematological and biochemical parameters in rats. The plant is used in the Amazon folk medicine for several diseases and the phenylpropanoid dilapiolle is the main constituent of its essential oil, possessing insecticidal, fungicidal, bactericidal, larvicidal and molluscicidal properties. The LD50 was 2.400 ± 191.7 mg/kg. The essential oil did not change the hematological and biochemical parameters in a significant manner when compared with the control in the subacute treatment, excepting the reduction of creatinine. The LD50 and the hematological and biochemical results have suggested that the essential oil presents low toxicity.
Acesso aberto (Open Access)
Método de identificação de genes taxonomicamente restritos em dados de RNA-seq em organismo não modelo
(Universidade Federal do Pará, 2015-09-28) OLIVEIRA, Lorena Silva de; DARNET, Sylvain Henri; http://lattes.cnpq.br/4586614214029929
Black pepper (Piper nigrum) is a biotechnologically interesting plant, research target for both metabolism exploration and improvement related to phytopathological problems, in addition to understanding the evolution of basal angiosperms, ancestral group to which it belongs. With the technological revolution, the next generation sequencing offered access to genetic heritage of non model plants enabling the opening of new biotechnological perspective. The identification of non homologous genes restricted to certain species, called taxonomically restricted genes (TRGs), is a primary biotechnological target, especially in species and groups that are divergent and ancestral. This study aims to establish a method for TRGs identification from RNA-seq data and to validate the approach a dataset for black pepper. The method consists in filtering the transcripts in several stages, so that the annotated transcripts and false positives are removed, and the remaining data without molecular information are classified as potential TRGs. The application of this approach to a black pepper transcriptome dataset (35,631 transcripts) resulted in 22,661 transcripts annotated by similarity. The transcripts that were not annotated in this first analysis were processed in the TRAPID tool, resulting in 12,895 transcripts not annotated. The evaluation of transcripts for false positive detection resulted in 245 true transcripts that were analyzed for the presence of non-coding RNA, resulting in 204 unidentified transcripts. At the end of the method application 71 non annotated transcripts remained with coding regions of protein, indicating potential TRGs. The characterization of these potential TRGs in black pepper can provide new information about the molecular mechanism of this specie and perhaps elucidate pathways for the establishment of cultivars tolerant to disease.
Acesso aberto (Open Access)
Morphoanatomical and physicochemical profile of Piper callosum: valuable assessment for its quality control
(Universidade Federal do Pará, 2017-02) SILVA, Rolf Junior Ferreira; DIAS, Ana Cristina Andrade de Aguiar; FAIAL, Kelson do Carmo Freitas; QUEIROZ, Maria Silvia de Mendonça
Piper callosum Ruiz & Pav., Piperaceae, popularly known as “elixir-paregórico” and “matricá” in Brazil, is used in folk medicine to treat gonorrhea, general pain, and digestive disorders, and has repellent, astringent, diuretic, depurative, and haemostatic properties. Despite the fact that this plant is sold as a traditional phytotherapeutic product, we did not find reports on its quality control. We, therefore, performed macroscopic, microscopic, histochemical, and physicochemical analyses using standard methods to establish botanical authentication and purity degree parameters for leaves and stem of this species in two forms: medicinal plant and herbal drug. We observed the size, shape, color, texture, fracture surface and transection characteristics, leaf venation patterns, and calluses are valuable diagnostic characters to identify the herbal drugs when they are not ground or powdered. Since medicinal plants and herbal drugs did not differ anatomically, the following key anatomical characters for P. callosum can be used for diagnostic purposes of both types raw plant materials: epicuticular wax and cuticular flanges patterns; collenchyma features; fibers in the midrib; arrangement pattern of the vascular bundles of the midrib and petiole; shape of the midrib, leaf margin, petiole, and stem; occurrence of raphides; and morphology of the starch grains. Acid lipids, essential oils, oleoresins, steroids, tannins and flavonoids were histochemically identified. Total ash (leaves: 11.25%; stem: 5.25%), sulphated ash (leaves: 68.02%; stem: 12.50%), acid-insoluble ash (leaves: 2.82%; stem: 0.27%), moisture (leaves: 8.60%; stem: 6.10%), loss on drying (leaves: 11.08%; stem: 8.58%), and pH (leaves: 5.57, stem: 5.28) values were determined. The order of analyzed metal levels in leaf and stem herbal drugs was Al > V > Cu > Mn > Cr > Ni. Similar levels of Cd and Co and low levels of Hg were found. The results obtained can be used as quality control parameters for medicinal plants and herbal drugs of P. callosum.
Acesso aberto (Open Access)
Produção e avaliação da atividade antioxidante de metabólitos secundários de Piper divaricatum G. Meyer sob diferentes condições de cultivo
(Universidade Federal do Pará, 2015-08-06) CORPES, Rosana Silva; SILVA, Joyce Kelly do Rosário da; http://lattes.cnpq.br/2278686174214080
Many species of the genus Piper are widely distributed in the Amazon and various biological applications because of large structural diversity of its secondary metabolites. The species Piper divaricatum, is endemic in the Amazon and produces in its essential oil high concentrations of methyleugenol (50-90%), an phenylpropanoid with antioxidant and fungicidal properties. Because of its potential applications, the objective of this study was to establish the in vitro cultivation and comparing the biosynthesis of secondary metabolites and antioxidant properties with the in vivo cultivation. For establish the in vitro culture were used shoot apexes on Murashige e Skoog medium with addition of regulator BAP 0.5 mg.mL-1. For in vivo cultivation, micropiles were propagated in the greenhouse in vermiculite and adding nutritious Murashige e Skoog solution. The volatile compounds identified in the leaves of seedlings grown in vivo were methyleugenol, β-elemene and E-β-ocimene, which did not differ from in vivo cultivation, with the exception of 90 days. The in vitro culture of roots was not efficient to produce phenylpropanoids and presented a very different profile compared to the in vivo cultivation of terpenes. In general, for plants in vitro cultivated there was no statistically significant difference in the phenolics compounds content and antioxidant activity in the leaves. However, the antioxidant activity of roots was significant. The results support the hypothesis that in vitro regenerated plants can synthesize metabolites similar the matrix plant and maintain their biological properties.