6 results on '"Jansen, Cristina"'
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2. Bioactive compounds in fruits from different regions of Brazil
- Author
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Otero, Deborah, Antunes, Bruna, Bohmer, Bruna, Jansen, Cristina, Crizel, Michele, Lorini, Alexandre, Krumreich, Fernanda, and Zambiazi, Rui Carlos
- Subjects
Functional properties ,Frutas brasileñas ,Antioxidant activity ,Brazilian fruits ,Actividad antioxidante ,Compuestos fenólicos ,Propiedad funcional ,Fatty acid ,Phenolic compounds ,Ácidos grasos - Abstract
It is important to determine the chemical composition of fruits in order to establish their potential health benefits for human nutrition and thus stimulate their cultivation and consumption. Therefore, the objective of this study was to determine the physical and chemical parameters, vitamin C content, phenolic compounds, flavonoids and carotenoids, fatty acid profile and antioxidant activity of fruits from different regions of Brazil. We observed that the different regions and fruits studied presented very distinct characteristics. For example, the cupuaçu pit is rich in unsaturated fatty acids, while the genipap and java plum presented high flavonoid content and the butia had a high concentration of carotenoids. Guava was the fruit with the highest antioxidant activity through the ABTS radical, while the yellow mombim presented the best response when the activity was determined by FRAP. RESUMEN Es importante determinar la composición química de las frutas para establecer sus potenciales beneficios para la salud humana y, por lo tanto, estimular su cultivo y consumo. El objetivo de este estudio fue determinar parámetros físicos y químicos, el contenido de vitamina C, los compuestos fenólicos, los flavonoides y los carotenoides, el perfil de ácidos grasos y la actividad antioxidante de las frutas de diferentes regiones de Brasil. De los resultados obtenidos en este estudio se pudo observar que las diferentes regiones y frutas estudiadas presentaban características muy distintas, ya que la semilla de cupuaçu es rica en ácidos grasos insaturados, mientras que el genipapo y la ciruela java presentaron un alto contenido de flavonoides y el butia presentó alta concentración de carotenoides. La guayaba fue la fruta con la mayor actividad antioxidante determinada por el radical ABTS, mientras que el mombim amarillo presentó la mejor respuesta cuando la actividad fue determinada por FRAP
- Published
- 2020
3. Bioactive compounds in fruits from different regions of Brazil
- Author
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Otero, Deborah, primary, Antunes, Bruna, additional, Bohmer, Bruna, additional, Jansen, Cristina, additional, Crizel, Michele, additional, Lorini, Alexandre, additional, Krumreich, Fernanda, additional, and Zambiazi, Rui Carlos, additional
- Published
- 2020
- Full Text
- View/download PDF
4. Stabilization of guava nectar with hydrocolloids and pectinases
- Author
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Krumreich, Fernanda Döring, primary, Corrêa, Ana Paula Antunes, additional, Nachtigal, Jair Costa, additional, Buss, Gerson Lübke, additional, Rutz, Josiane Kuhn, additional, Crizel-Cardozo, Michele Maciel, additional, Jansen, Cristina, additional, and Zambiazi, Rui Carlos, additional
- Published
- 2018
- Full Text
- View/download PDF
5. Propolis: phytochemicals and antioxidante, antibacterial and cytotoxic activity
- Author
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Jansen, Cristina, Gandra, Eliezer Ávila, and Zambiazi, Rui Carlos
- Subjects
Staphylococcus aureus ,Compostos fenólicos ,Escherichia coli ,Câncer ,Listeria monocytogenes ,CIENCIAS DA SAUDE::NUTRICAO [CNPQ] ,Phenolic compounds ,Cancer - Abstract
Submitted by Aline Batista (alinehb.ufpel@gmail.com) on 2018-05-16T14:04:54Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_Cristina_Jansen.pdf: 1461357 bytes, checksum: 1eabd3351ea2e61e231bd4b28f9e3f34 (MD5) Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2018-05-16T20:22:16Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_Cristina_Jansen.pdf: 1461357 bytes, checksum: 1eabd3351ea2e61e231bd4b28f9e3f34 (MD5) Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2018-05-16T20:22:31Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_Cristina_Jansen.pdf: 1461357 bytes, checksum: 1eabd3351ea2e61e231bd4b28f9e3f34 (MD5) Made available in DSpace on 2018-05-16T20:22:31Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_Cristina_Jansen.pdf: 1461357 bytes, checksum: 1eabd3351ea2e61e231bd4b28f9e3f34 (MD5) Previous issue date: 2015-03-23 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES A colmeia constitui-se em uma fonte de geração de produtos de alto valor nutritivo e com grandes potencialidades farmacológicas. A própolis é um dos produtos obtidos da colmeia, que é produzida pelas abelhas através da coleta de resinas e gomas de árvores, de plantas e de flores, materiais que são parcialmente digeridos e acrescentados de cera e pólen. As propriedades biológicas da própolis são atribuídas principalmente ao conteúdo de fitoquímicos. Dentre estes compostos, os que estão presentes em maior proporção são os compostos fenólicos, majoritariamente os da classe dos flavonoides. Porém, vários são os fatores que interferem na composição química da própolis, o que acaba refletindo no conteúdo e proporção dos diferentes fitoquímicos, e, portanto, em suas propriedades. O Brasil, sendo um país com grande diversidade de vegetação, favorece ampla variação na composição da própolis, contribuindo para dificultar a padronização deste produto no país. Assim, o objetivo deste estudo foi avaliar a composição de fitoquímicos em amostras de própolis oriundas do Sul do Rio Grande do Sul, afim de testar suas propriedades biológicas. Parte das amostras de própolis foram analisadas quanto aos principais parâmetros físico-químicos, e de outra parte foram preparados extratos hidroalcoólicos concentrados. Os extratos foram submetidos à determinação química de compostos fenólicos, flavonoides e carotenoides, e da análise de espectroscopia Ultravioleta-Visível. Também foram avaliados quanto à capacidade antioxidante, através dos métodos de DPPH, ABTS e FRAP; quanto à atividade antibacteriana frente a cepas de bactérias patogênicas (Staphylococcus aureus, Escherichia coli, Listeria monocytogenes); e quanto ao efeito citotóxico, o qual foi realizado através do método de redução do MTT em células da linhagem melanoma B16F10. Dentre os parâmetros físico-químicos, apenas uma amostra apresentou conteúdo de umidade acima do permitido pela legislação brasileira. A cor foi definida como amarela para as amostras oriundas de Rio Grande e de Canguçu, e castanho claro para as amostras oriundas de Pelotas e de Pedro Osório. Todas as amostras apresentaram alto teor dos fitoquímicos analisados (compostos fenólicos, flavonoides e carotenoides); porém, houve variação significativa no conteúdo destes compostos entre as diferentes amostras. Pelo espectro UV observou-se absorção máxima entre 290 e 400 nm, região característica da absorção dos flavonoides. As amostras de própolis de Pelotas e de Rio Grande apresentaram alta capacidade antioxidante determinada pelos métodos com o radical DPPH e FRAP, sendo comparáveis aos obtidos com o padrão quercetina. Constatou-se uma relação positiva entre as amostras com maior teor de fitoquímicos e a elevada ação antioxidante. Todas as amostras apresentaram atividade antibacteriana frente às cepas testadas; porém, os resultados foram superiores na inibição das bactérias Gram-positivas (S. aureus e L. monocytogenes) do que para a bactéria Gram-negativa (E. coli O157:H7), sendo que as amostras de Pelotas e Rio Grande tiveram alta ação bactericida. Todas as amostras de própolis analisadas demonstraram ação citotóxica em 48h no combate às células de câncer de melanoma de camundongo, nas concentrações de 250 e 500 μg.mL-1. Após 72h a própolis causou citotoxicidade na concentração de 25 μg.mL-1. Amostras oriundas de Pelotas e de Rio Grande apresentaram resultados promissores no combate à linhagem testada. The beehive is a source of nutritious high-value products and with great pharmacological potential. Propolis is one of the products obtained from the beehive, produced by honey bees by collecting resin and gum trees, plants and flowers, which are partially digested and added of wax and pollen. Its biological properties are mainly attributed to phytochemicals. Among these, the highest contend are phenolic compounds, mainly the class of flavonoids. However, there are several factors that influence the chemical composition of propolis, which ends up reflecting on their properties. The Brazil is a country with great diversity of vegetation that enhances the variations in the composition of propolis, contributing to hinder its standardization in the country. Therefore, the aim of this study was to evaluate the composition of phytochemicals of propolis samples of South of Rio Grande do Sul, and test their biological properties. Part of the propolis samples were analyzed for major physical and chemical parameters and another part was used to obtain the etanolic extracts. The extracts were subjected to determination of phenolic compounds, flavonoids and carotenoids, and analysis of Ultraviolet-visible spectroscopy. Also it was determined the antioxidant capacity that was measured by the methods DPPH, ABTS and FRAP. The antibacterial activity was evaluated against strains of pathogenic bacteria (Staphylococcus aureus, Escherichia coli, Listeria monocytogenes). The cytotoxic effect was performed using the MTT reduction method melanoma cell line B16F10. For the physico-chemical parameters, only one sample showed humidity values above those permitted by brasilian legislation. The color was defined as yellow for the Rio Grande and Canguçu samples, and light brown to Pelotas and Pedro Osorio samples. The samples showed high concentration of the analyzed phytochemicals (phenolics, flavonoids and carotenoids), but there was significant variation between samples. The UV spectrum showed absorption maxima between 290 and 400 nm, characteristic of the region flavonoids. Propolis from Pelotas and Rio Grande showed the highest antioxidant capacity by method with DPPH radical and FRAP, comparable to those obtained with the standard quercetin. It was found a positive relationship between the samples with higher levels of phytochemicals and antioxidant effects. All samples showed antibacterial activity against all tested strains, but the results were better in the inhibition of Gram-positive bacteria (S. aureus and L. monocytogenes) than for Gram-negative (E. coli O157: H7), and samples of Pelotas and Rio Grande had high bactericidal action. The propolis samples analyzed showed cytotoxic action in 48 hours in fighting cells of mouse melanoma cancer at concentrations of 250 and 500 μg.mL-1. After 72h propolis caused decrease in carcinogenic lineage in concentrations 25μg.mL-1. Samples of Pelotas and Rio Grande showed promising results in combating tested lineage.
- Published
- 2015
6. AVALIAÇÃO DA QUALIDADE FÍSICO-QUÍMICA DO MEL PRODUZIDO NA CIDADE DE PELOTAS/RS.
- Author
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Richter, Willian, Jansen, Cristina, Lemos, Tiane Schuch, Mendonça, Carla Rosane Barboza, and Borges, Caroline Dellinghausen
- Subjects
HONEY ,HYDROXYMETHYLFURFURAL ,COMMERCIALIZATION ,ACIDITY ,PHYSIOLOGY - Abstract
Copyright of Brazilian Journal of Food & Nutrition / Alimentos e Nutrição is the property of Faculdade de Ciencias Farmaceuticas, UNESP and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
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