EQA - Escola de Química e Alimentos
URI permanente desta comunidadehttps://rihomolog.furg.br/handle/1/1610
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4 resultados
Resultados da Pesquisa
- ItemFatty acids profile of spirulina platensis grown under different temperatures and nitrogen concentrations(2004) Colla, Luciane Maria; Bertolin, Telma Elita; Costa, Jorge Alberto VieiraThe influence of culture temperature and the concentration of sodium nitrate (NaNO3) on the gas-chromatographic profile of the fatty acids of the filamentous cyanobacterium Spirulina platensis was evaluated. We found that temperature was the most important factor and that the greatest amount of gamma-linolenic acid (GLA) was obtained at 30 ∞C, the fatty acid profile of the Spirulina cultivated showing that (in order of abundance) palmitic, linolenic and linoleic acids were most prevalent.
- ItemEffect of Microalga Spirulina platensis (Arthrospira platensis) on Hippocampus Lipoperoxidation and Lipid Profile in Rats with Induced Hypercholesterolemia(2009) Bertolin, Telma Elita; Pilatti, Dayane; Giacomini, Ana Cristina Vendrametto Varrone; Bavaresco, Caren Serra; Colla, Luciane Maria; Costa, Jorge Alberto VieiraStudies have been conducted on microalga Spirulina platensis (Arthrospira platensis) due to its therapeutic potential in several areas, including the capacity for preventing and decreasing the damages caused by hyperlipidemia and the antioxidant activity. The aim of the study was to evaluate the effect of microalga Spirulina platensis on hippocampus lipoperoxidation and lipid profile in rats with induced hypercholesterolemia during 60 days. The measurement of hippocampus lipoperoxidation did not demonstrate significant difference (p>0.05) when Spirulina platensis was added to hypercholesterolemic diet. The evaluation of lipid profile showed that the administration of the microalga in therapeutic and preventive ways led to a significant protective effect (p<0.05) from hypercholesterolemia.
- ItemCultivation of microalgae Spirulina platensis (Arthrospira platensis) from biological treatment of swine wastewater(2010) Mezzomo, Natália; Saggiorato, Adriana Galon; Siebert, Rochele; Tatsch, Pihetra Oliveira; Lago, Maria Cristina; Hemkemeier, Marcelo; Costa, Jorge Alberto Vieira; Bertolin, Telma Elita; Colla, Luciane MariaThe microalgae biomass production from swine wastewater is a possible solution for the environmental impact generated by wastewater discharge into water sources. The biomass can be added to fish feed, which can be used in the formulation of meat products. This work addresses the adaptation of the microalgae Spirulina platensis (Arthrospira platensis) in swine wastewater and the study of the best dilution of the wastewater for maximum biomass production and for removal of Chemical Oxygen Demand (COD), ammonia and phosphorous to the microalgae. The cultivation of Spirulina platensis, strain Paracas presented maximum cellular concentrations and maximum specific growth rates in the wastewater concentration of 5.0 and 8.5%. The highest COD removals occurred with 26.5 and 30.0% of wastewater in the medium. The maximum removal of total phosphorous (41.6%), was with 8.5% of wastewater, which is related to the microalgae growth. The results of Spirulina culture in the swine wastewater demonstrated the possibility of using these microalgae for the COD and phosphorous removal and for biomass production.
- ItemCapacidade antioxidante da microalga Spirulina platensis em células da levedura Saccharomyces cerevisiae submetidas ao estressor paraquat(2010) Guarienti, Cíntia; Bertolin, Telma Elita; Costa, Jorge Alberto VieiraEm virtude de várias publicações terem mostrado a alta associação entre a geração de radicais livres e as doenças crônico-degenerativas, tem havido grande interesse por alimentos funcionais antioxidantes. O excesso de espécies reativas no organismo resulta em estresse oxidativo que provoca danos celulares e teciduais. A microalga Spirulina tem sido pesquisada em função de suas propriedades nutricionais e antioxidantes. O objetivo desse trabalho foi de avaliar a atividade antioxidante da microalga Spirulina, utilizando-se a levedura Saccharomyces cerevisiae como modelo biológico. A levedura foi submetida ao estressor 1,1’- dimetil - 4,4’- bipiridilio (paraquat), nas concentrações 0, 10 e 15 mM. O potencial antioxidante foi avaliado pela técnica de sobrevivência celular (plaqueamento) e pelo ensaio de lipoperoxidação (valores de TBA). Observou-se aumento significativo de sobrevivência celular (p ≤ 0,05), quando submetidos aos tratamentos com paraquat e Spirulina, em comparação com o experimento em que foi utilizado somente o paraquat. O agente estressor gerou aumento significativo (p ≤ 0,05) na lipoperoxidação (valores de TBA), o qual foi atenuado pelo tratamento com Spirulina, não diferindo do tratamento controle (p > 0,05). A microalga Spirulina apresentou capacidade antioxidante, que protege as células da levedura contra os danos oxidantes provocados pelo paraquat.