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Adriana Noemi Mauri - One of the best experts on this subject based on the ideXlab platform.
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carboxymethylcellulose montmorillonite nanocomposite films activated with murta Ugni molinae turcz leaves extract
Carbohydrate Polymers, 2012Co-Authors: Marcela Quilaqueo Gutierrez, Ignacio Echeverria, Monica Ihl, Valerio Bifani, Adriana Noemi MauriAbstract:Abstract The functionality of nanocomposite films based on carboxymethylcellulose (CMC) and montmorillonite (MMT) activated with murta ( Ugni molinae Turcz) leaves extract was studied. Films were prepared by casting from film-forming dispersions containing CMC, glycerol (used as plasticizer) and different concentrations of MMT, using water or murta extract as solvent. The addition of MMT increased the tensile strength and the elasticity modulus of the films, and decreased their permeabilities to water vapor, oxygen and carbon dioxide. Besides the antioxidants properties provided to the films, the addition of murta leaves extract changed the gas permeability in different forms according to the MMT content, and plasticized the nanocomposite matrix.
Rosa Negrete - One of the best experts on this subject based on the ideXlab platform.
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topical anti inflammatory activity of 2α hydroxy pentacyclic triterpene acids from the leaves of Ugni molinae
Bioorganic & Medicinal Chemistry, 2006Co-Authors: Maria C Aguirre, Carla Delporte, Bruce K. Cassels, Ximena Silva, N Backhouse, Silvia Erazo, M E Letelier, Sergio Alegria, Rosa NegreteAbstract:Abstract Leaf extracts of Ugni molinae Turcz. are used in the Chilean cosmetic industry on the assumption that they have decongestant, regenerative, and anti-aging properties. A bioassay-guided fractionation of this plant material showed that some extracts have potent anti-inflammatory activities. Further fractionation led to the isolation and identification of betulinic acid, a mixture of ursolic and oleanolic acids, and the 2α-hydroxy derivatives alphitolic, asiatic, and corosolic acids. The latter three were evaluated in vivo in the mouse ear assay for their topical anti-inflammatory activity, inducing inflammation with either arachidonic acid (AA) or 12- O -tetradecanoylphorbol-13 acetate (TPA). Only corosolic acid was active in the AA assay, with similar potency to nimesulide, but all three triterpene acids inhibited TPA-induced inflammation with potencies comparable to that of indomethacin.
Marcela Quilaqueo Gutierrez - One of the best experts on this subject based on the ideXlab platform.
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carboxymethylcellulose montmorillonite nanocomposite films activated with murta Ugni molinae turcz leaves extract
Carbohydrate Polymers, 2012Co-Authors: Marcela Quilaqueo Gutierrez, Ignacio Echeverria, Monica Ihl, Valerio Bifani, Adriana Noemi MauriAbstract:Abstract The functionality of nanocomposite films based on carboxymethylcellulose (CMC) and montmorillonite (MMT) activated with murta ( Ugni molinae Turcz) leaves extract was studied. Films were prepared by casting from film-forming dispersions containing CMC, glycerol (used as plasticizer) and different concentrations of MMT, using water or murta extract as solvent. The addition of MMT increased the tensile strength and the elasticity modulus of the films, and decreased their permeabilities to water vapor, oxygen and carbon dioxide. Besides the antioxidants properties provided to the films, the addition of murta leaves extract changed the gas permeability in different forms according to the MMT content, and plasticized the nanocomposite matrix.
João Batista Fernandes Da ,silva - One of the best experts on this subject based on the ideXlab platform.
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Notes on the genus Ugni Turcz. (Myrtaceae) in the Brazilian Amazonia
Instituto Nacional de Pesquisas da Amazônia, 2004Co-Authors: Alessandro Silva Do Rosário, Secco, Ricardo De S., João Batista Fernandes Da ,silvaAbstract:O objetivo deste trabalho é registrar a ocorrência de Ugni Turcz., um gênero raro e mal conhecido na Amazônia Brasileira. Ugni é composto por quatro espécies, sendo que apenas Ugni myricoides (Kunth) O. Berg ocorre no Brasil, habitando principalmente regiões de altitude nos Estados de Roraima e Amazonas (Serra da Neblina), sendo conhecido nos Herbários regionais somente de uma coleta. Ugni têm sido considerado por muitos botânicos como sinônimo de Myrtus Linnaeus, devido ambos apresentarem caracteres morfológicos muito semelhantes entre si. Porém, Ugni é caracterizado por apresentar hábito arbóreo ou arbustivo, folhas pequenas, freqüentemente com 2 cm de comprimento ou menos, coriáceas, margens revolutas, venação secundária inconspícua, inflorescências unifloras, corola (4) 5-mera, pétalas brancas, com mancha avermelhada no centro, estames 25-30, anteras sagitadas, ovário (2-) 3-locular, 4-23 óvulos por lóculo, sementes 15-20 e embrião em forma de C.The goal of this study is to document the occurrence of the genus Ugni Turcz. in Brazil, where it is rare and poorly known. Ugni comprises four species, but only U. myricoides (Kunth) O. Berg occurs in Brazil, in high-elevation areas on Roraima Mountain (State of Roraima) and in the Serra of Neblina (State of Amazonas). This species is only known in the Amazonian herbaria by just one collection. Ugni is easily confused with Myrtus L. due the morphological resemblance between them, but Ugni are shrubs or small trees. Its leaves are small, usually less than 2 cm long, and coriaceous, and have revolute margins and inconspicuous secondary veins; its flowers are solitary and usually have five, sometimes four, white petals with a reddish central spot and usually three, sometimes two, locules per ovary, each with four to 23 ovules; and its fruits have 15 to 20 seeds with C-shaped embryos
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Notas sobre Ugni Turcz. (Myrtaceae) na Amazônia Brasileira Notes on the genus Ugni Turcz. (Myrtaceae) in the Brazilian Amazonia
Instituto Nacional de Pesquisas da Amazônia, 2004Co-Authors: Alessandro Silva Do Rosário, Ricardo De S. Secco, João Batista Fernandes Da ,silvaAbstract:O objetivo deste trabalho é registrar a ocorrência de Ugni Turcz., um gênero raro e mal conhecido na Amazônia Brasileira. Ugni é composto por quatro espécies, sendo que apenas Ugni myricoides (Kunth) O. Berg ocorre no Brasil, habitando principalmente regiões de altitude nos Estados de Roraima e Amazonas (Serra da Neblina), sendo conhecido nos Herbários regionais somente de uma coleta. Ugni têm sido considerado por muitos botânicos como sinônimo de Myrtus Linnaeus, devido ambos apresentarem caracteres morfológicos muito semelhantes entre si. Porém, Ugni é caracterizado por apresentar hábito arbóreo ou arbustivo, folhas pequenas, freqüentemente com 2 cm de comprimento ou menos, coriáceas, margens revolutas, venação secundária inconspícua, inflorescências unifloras, corola (4) 5-mera, pétalas brancas, com mancha avermelhada no centro, estames 25-30, anteras sagitadas, ovário (2-) 3-locular, 4-23 óvulos por lóculo, sementes 15-20 e embrião em forma de C.The goal of this study is to document the occurrence of the genus Ugni Turcz. in Brazil, where it is rare and poorly known. Ugni comprises four species, but only U. myricoides (Kunth) O. Berg occurs in Brazil, in high-elevation areas on Roraima Mountain (State of Roraima) and in the Serra of Neblina (State of Amazonas). This species is only known in the Amazonian herbaria by just one collection. Ugni is easily confused with Myrtus L. due the morphological resemblance between them, but Ugni are shrubs or small trees. Its leaves are small, usually less than 2 cm long, and coriaceous, and have revolute margins and inconspicuous secondary veins; its flowers are solitary and usually have five, sometimes four, white petals with a reddish central spot and usually three, sometimes two, locules per ovary, each with four to 23 ovules; and its fruits have 15 to 20 seeds with C-shaped embryos
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Notas sobre Ugni Turcz. (Myrtaceae) na Amazônia Brasileira
Instituto Nacional de Pesquisas da Amazônia, 2004Co-Authors: Alessandro Silva Do Rosário, Secco, Ricardo De S., João Batista Fernandes Da ,silvaAbstract:O objetivo deste trabalho é registrar a ocorrência de Ugni Turcz., um gênero raro e mal conhecido na Amazônia Brasileira. Ugni é composto por quatro espécies, sendo que apenas Ugni myricoides (Kunth) O. Berg ocorre no Brasil, habitando principalmente regiões de altitude nos Estados de Roraima e Amazonas (Serra da Neblina), sendo conhecido nos Herbários regionais somente de uma coleta. Ugni têm sido considerado por muitos botânicos como sinônimo de Myrtus Linnaeus, devido ambos apresentarem caracteres morfológicos muito semelhantes entre si. Porém, Ugni é caracterizado por apresentar hábito arbóreo ou arbustivo, folhas pequenas, freqüentemente com 2 cm de comprimento ou menos, coriáceas, margens revolutas, venação secundária inconspícua, inflorescências unifloras, corola (4) 5-mera, pétalas brancas, com mancha avermelhada no centro, estames 25-30, anteras sagitadas, ovário (2-) 3-locular, 4-23 óvulos por lóculo, sementes 15-20 e embrião em forma de C
Maria C Aguirre - One of the best experts on this subject based on the ideXlab platform.
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topical anti inflammatory activity of 2α hydroxy pentacyclic triterpene acids from the leaves of Ugni molinae
Bioorganic & Medicinal Chemistry, 2006Co-Authors: Maria C Aguirre, Carla Delporte, Bruce K. Cassels, Ximena Silva, N Backhouse, Silvia Erazo, M E Letelier, Sergio Alegria, Rosa NegreteAbstract:Abstract Leaf extracts of Ugni molinae Turcz. are used in the Chilean cosmetic industry on the assumption that they have decongestant, regenerative, and anti-aging properties. A bioassay-guided fractionation of this plant material showed that some extracts have potent anti-inflammatory activities. Further fractionation led to the isolation and identification of betulinic acid, a mixture of ursolic and oleanolic acids, and the 2α-hydroxy derivatives alphitolic, asiatic, and corosolic acids. The latter three were evaluated in vivo in the mouse ear assay for their topical anti-inflammatory activity, inducing inflammation with either arachidonic acid (AA) or 12- O -tetradecanoylphorbol-13 acetate (TPA). Only corosolic acid was active in the AA assay, with similar potency to nimesulide, but all three triterpene acids inhibited TPA-induced inflammation with potencies comparable to that of indomethacin.
