• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Efeitos antioxidante e antiinflamatÃrio da polpa de pitanga roxa (Eugenia uniflora L.) sobre cÃlulas bucais humanas, aplicando experimentos in vitro e ex vivo / Antioxidant and antiinflammatory effects of purple pitanga pulp (Eugenia uniflora L.) on human gingival cells, applying in vitro and ex vivo experiments

Denise Josino Soares 24 January 2014 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / A pitanga (Eugenia uniflora L.) à uma fruta tropical encontrada na regiÃo que compreende a parte central do Brasil e o Nordeste da Argentina. Este fruto possui baixo conteÃdo de lipÃdios, sendo rico em vitaminas e compostos bioativos, como os polifenÃis e carotenÃides. Devido ao uso da pitangueira na medicina popular e escassez de trabalhos cientÃficos sobre as propriedades antioxidantes e antiinflamatÃrias da pitanga roxa, o presente trabalho teve como objetivo investigar essas caracterÃsticas na polpa e no suco tropical de pitanga roxa adoÃado, usando experimentos in vitro e ex vivo. No presente estudo, a polpa de roxa foi separada em duas fraÃÃes (volÃtil e nÃo volÃtil), sendo o composto majoritÃrio de cada fraÃÃo identificado e quantificado. CÃlulas da gengiva humana (provenientes de seis voluntÃrios) foram expostas ao suco tropical de pitanga e ao composto majoritÃrio de cada fraÃÃo e analisadas quanto a atividade da catalase, o dano do DNA e a liberaÃÃo da interleucina 8 (IL-8). O experimento tambÃm foi realizado em cÃlulas dos fibroblastos gengivais humanos (HGF-1), cujas cÃlulas foram expostas aos compostos majoritÃrios das duas fraÃÃes da polpa de pitanga roxa e a liberaÃÃo da IL-8 foi analisada. A polpa de pitanga roxa apresentou valores mÃdios de sÃlidos solÃveis (8,33  0,06 ÂBrix), pH (3,12  0,01), acidez titulÃvel (1,76  0,20 g Ãcido cÃtrico/100 mL) e aÃÃcares totais (9,28  0,60 g glicose/100 mL) dentro dos padrÃes exigidos pela legislaÃÃo brasileira vigente. A referida polpa apresentou, ainda, nÃveis considerÃveis dos compostos bioativos: antocianinas (24,82  0,46 mg/100 mL), flavonÃides amarelos (11,33  0,66 mg/100 mL) e polifenÃis extraÃveis totais (26,85  0,30 mg GAE/100 mL), fazendo deste fruto uma boa fonte de antioxidantes naturais. Como composto majoritÃrio das fraÃÃes volÃtil e nÃo volÃtil da polpa de pitanga observa-se a oxidoselina-1,3,7(11)-trien-8-ona (85  4,01 Âg/mL) e a cianidina-3-glicosÃdeo (340  4,19 Âg/mL), respectivamente. O baixo pH do suco tropical de pitanga roxa adoÃado provocou uma reduÃÃo da atividade da catalase, enquanto a oxidoselina-1,3,7(11)-trien-8-ona e a cianidina-3-glicosÃdeo nÃo interferiram e nÃo foram capazes de inibir a atividade desta enzima. O suco tropical de pitanga roxa adoÃado preveniu o dano do DNA em cÃlulas da gengiva humana. Devido ao baixo nÃmero de voluntÃrios no experimento com o suco tropical de pitanga roxa adoÃado e os compostos majoritÃrios das fraÃÃes volÃtil e nÃo volÃtil da polpa de pitanga roxa, os resultados referentes à liberaÃÃo da IL-8 sÃo inconclusivos. Cianidina-3-glicosÃdeo e oxidoselina-1,3,7(11)-trien-8-ona apresentaram efeito antiinflamatÃrio em cÃlulas HGF-1. / Pitanga (Eugenia uniflora L.) is a tropical fruit found in the region that covers the central part of Brazil to Northern Argentina. This fruit has low lipid content, and is rich in bioactive compounds, such as polyphenols and carotenoids. In view of the use of pitanga tree in folk medicine and the shortage of scientific works about the antioxidative and anti-inflammatory effect of the purple pitanga, the present work aimed to investigate these characteristics in the pulp and in the sweetened tropical juice of purple pitanga, using in vitro and ex vivo experiments. In the present study, purple pitanga pulp was divided into two fractions (volatile and non-volatile), and the main compound of each fraction was identified and quantified. Human gingival cells (from six volunteers) were exposed to purple pitanga sweetened tropical juice and its main volatile and non-volatile compounds and analyzed by the catalase activity, DNA damage and interleukin 8 (IL-8) releases. The experiment was also performed with human gingival fibroblast (HGF-1), where cells were exposed to the individual main compounds from purple pitanga pulp and the IL-8 release was analyzed. Purple pitanga pulp presented mean values of soluble solids (8.33  0.06 ÂBrix), pH (3.12  0.01), titratable acidity (1.76  0.20 g citric acid/100 mL) and total sugars (9.28  0.60 g glucose/100 mL) within the standards required by current Brazilian law. This pulp also showed significant levels of the bioactive compounds: anthocyanins (24.82  0.46 mg/100 mL), yellow flavonoids (11.33  0.66 mg/100 mL) and total extractable polyphenols (26.85  0.30 mg GAE/100 mL), making this product a good source of natural antioxidants. With regard to the main compound from volatile and non-volatile fractions of purple pitanga pulp, oxidoselina-1,3,7(11)-trien-8-one (85  4.01 Âg/mL) was observed in the volatile fraction and cyanidin-3-glucoside (340  4.19 Âg/mL )was observed in the non-volatile fraction. The low pH of the purple pitanga sweetened tropical juice decreases catalase activity, while oxidoselina-1,3,7(11)-trien-8-one and cyanidin-3-glucoside did not interfere and were not able to inhibit the activity of this enzyme. Purple pitanga sweetened tropical juice prevented DNA damage in human gingival cells. Due to the low number of volunteers in the experiment with purple pitanga sweetened tropical juice and the main compounds from volatile and non-volatile fractions of purple pitanga pulp, the results regarding the IL-8 release are inconclusive. Cyanidin-3-glucoside and oxidoselina-1,3,7(11)-trien-8-one presented anti-inflammatory effects in HGF-1 cells.

Page generated in 0.0412 seconds