Influência do estresse nutricional programado na composição da microalga isochrysis galbana

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Global warming due to Greenhouse Gases (GHG) emissions, especially CO2, has been identified as one of the major problems of the twenty-first century, considering the consequences that could represent to planet. Currently, biological processes have been mentioned as a possible solution, especially CO...

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Main Author: Chagas, Bruna Maria Emerenciano das
Other Authors: Chiavone Filho, Osvaldo
Format: masterThesis
Language:por
Published: Universidade Federal do Rio Grande do Norte
Subjects:
Microalga
Estresse nutricional
Lipídios
Rendimento
Biocombustível
Microalgae
Nutritional stress
lipid
Yield
Biofuels
CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA
Online Access:https://repositorio.ufrn.br/jspui/handle/123456789/15802
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id ri-123456789-15802
record_format dspace
institution Repositório Institucional
collection RI - UFRN
language por
topic Microalga
Estresse nutricional
Lipídios
Rendimento
Biocombustível
Microalgae
Nutritional stress
lipid
Yield
Biofuels
CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA
spellingShingle Microalga
Estresse nutricional
Lipídios
Rendimento
Biocombustível
Microalgae
Nutritional stress
lipid
Yield
Biofuels
CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA
Chagas, Bruna Maria Emerenciano das
Influência do estresse nutricional programado na composição da microalga isochrysis galbana
description Global warming due to Greenhouse Gases (GHG) emissions, especially CO2, has been identified as one of the major problems of the twenty-first century, considering the consequences that could represent to planet. Currently, biological processes have been mentioned as a possible solution, especially CO2 biofixation due to association microalgae growth. This strategy has been emphasized as in addition to CO2 mitigation, occurs the production of biomass rich in compounds of high added value. The Microalgae show high photosynthetic capacity and growth rate higher than the superior plants, doubling its biomass in one day. Its culture does not show seasons, they grow in salt water and do not require irrigation, herbicides or pesticides. The lipid content of these microorganisms, depending on the species, may range from 10 to 70% of its dry weight, reaching 90% under certain culture conditions. Studies indicate that the most effective method to promote increased production of lipids in microalgae is to induce stress by limiting nitrogen content in the culture medium. These evidences justify research continuing the production of biofuels from microalgae. In this paper, it was studied the strategy of increasing the production of lipids in microalgae I. galbana with programmed nutritional stress, due to nitrogen limitation. The physiological responses of microalgae, grown in f / 2 with different concentrations of nitrogen (N: P 15,0-control, N: 5,0 P and N: P 2,5) were monitored. During exponential phase, results showed invariability in the studied conditions. However the cultures subjected to stress in stationary phase, showed lower biomass yields. There was an increase of 32,5% in carbohydrate content and 87.68% in lipids content at N: P ratio of 5,0 and an average decrease of 65% in protein content at N: P ratios of 5, 0 and 2.5. There were no significant variations in ash content, independently of cultivation and growth phase. Despite the limitation of biomass production in cultures with N: P smaller ratios, the increase of lipid accumulation highest lipids yields were observed as compared to the control culture. Given the increased concentration of lipids associated to stress, this study suggests the use of microalgae Isochrysis galbana as an alternative raw material for biofuel production
author2 Chiavone Filho, Osvaldo
author_facet Chiavone Filho, Osvaldo
Chagas, Bruna Maria Emerenciano das
format masterThesis
author Chagas, Bruna Maria Emerenciano das
author_sort Chagas, Bruna Maria Emerenciano das
title Influência do estresse nutricional programado na composição da microalga isochrysis galbana
title_short Influência do estresse nutricional programado na composição da microalga isochrysis galbana
title_full Influência do estresse nutricional programado na composição da microalga isochrysis galbana
title_fullStr Influência do estresse nutricional programado na composição da microalga isochrysis galbana
title_full_unstemmed Influência do estresse nutricional programado na composição da microalga isochrysis galbana
title_sort influência do estresse nutricional programado na composição da microalga isochrysis galbana
publisher Universidade Federal do Rio Grande do Norte
publishDate 2014
url https://repositorio.ufrn.br/jspui/handle/123456789/15802
work_keys_str_mv AT chagasbrunamariaemerencianodas influenciadoestressenutricionalprogramadonacomposicaodamicroalgaisochrysisgalbana
_version_ 1773959921961795584
spelling ri-123456789-158022017-11-02T07:14:36Z Influência do estresse nutricional programado na composição da microalga isochrysis galbana Chagas, Bruna Maria Emerenciano das Chiavone Filho, Osvaldo http://lattes.cnpq.br/2621516646153655 Araújo, Ofélia de Queiroz Fernandes http://lattes.cnpq.br/2347662604044532 Silva, Anita Ferreira da http://lattes.cnpq.br/2206935989496987 Lima, Anita Maria de http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4767606U6 Microalga Estresse nutricional Lipídios Rendimento Biocombustível Microalgae Nutritional stress lipid Yield Biofuels CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA Global warming due to Greenhouse Gases (GHG) emissions, especially CO2, has been identified as one of the major problems of the twenty-first century, considering the consequences that could represent to planet. Currently, biological processes have been mentioned as a possible solution, especially CO2 biofixation due to association microalgae growth. This strategy has been emphasized as in addition to CO2 mitigation, occurs the production of biomass rich in compounds of high added value. The Microalgae show high photosynthetic capacity and growth rate higher than the superior plants, doubling its biomass in one day. Its culture does not show seasons, they grow in salt water and do not require irrigation, herbicides or pesticides. The lipid content of these microorganisms, depending on the species, may range from 10 to 70% of its dry weight, reaching 90% under certain culture conditions. Studies indicate that the most effective method to promote increased production of lipids in microalgae is to induce stress by limiting nitrogen content in the culture medium. These evidences justify research continuing the production of biofuels from microalgae. In this paper, it was studied the strategy of increasing the production of lipids in microalgae I. galbana with programmed nutritional stress, due to nitrogen limitation. The physiological responses of microalgae, grown in f / 2 with different concentrations of nitrogen (N: P 15,0-control, N: 5,0 P and N: P 2,5) were monitored. During exponential phase, results showed invariability in the studied conditions. However the cultures subjected to stress in stationary phase, showed lower biomass yields. There was an increase of 32,5% in carbohydrate content and 87.68% in lipids content at N: P ratio of 5,0 and an average decrease of 65% in protein content at N: P ratios of 5, 0 and 2.5. There were no significant variations in ash content, independently of cultivation and growth phase. Despite the limitation of biomass production in cultures with N: P smaller ratios, the increase of lipid accumulation highest lipids yields were observed as compared to the control culture. Given the increased concentration of lipids associated to stress, this study suggests the use of microalgae Isochrysis galbana as an alternative raw material for biofuel production Coordenação de Aperfeiçoamento de Pessoal de Nível Superior O aquecimento global decorrente da emissão dos gases geradores do Efeito Estufa (GEE), em especial o CO2, é um dos problemas mais graves do século XXI, tendo em vista as conseqüências que esse agravante pode trazer ao planeta. Atualmente, os processos biológicos vêm sendo apontados como uma possível solução, principalmente a biofixação do CO2 por microalgas. Essa estratégia tem sido ressaltada, uma vez que, paralelamente a mitigação do CO2 ocorre à produção de biomassa rica em compostos de alto valor econômico agregado. As microalgas possuem alta capacidade fotossintética e taxa de crescimento superior aos vegetais superiores, duplicam a sua biomassa em um dia. O seu cultivo não segue regime de safras, são cultivadas em meio salino simples e não exigem irrigação, herbicidas ou pesticidas. O teor de lipídios destes microrganismos, dependendo da espécie, varia de 1 a 70% do seu peso seco, podendo chegar a 90% em certas condições de cultivo. Estudos indicam que é possível aumentar a produção de lipídios pelas microalgas através de estresses fisiológicos induzidos pela restrição do nitrogênio no meio de cultura. Essas evidências justificam pesquisas envolvendo a produção de biocombustíveis a partir de microalgas. No presente trabalho, estudou-se a estratégia de aumentar a produção de lipídios pela microalga I. galbana através de um estresse nutricional programado, ocasionado pela restrinção do nitrogênio. Foram acompanhadas as respostas fisiológicas desta espécie, cultivada em meio f/2 com diferentes concentrações de nitrogênio (razões mássica N:P 15,0-controle, N:P 5,0 e N:P 2,5). Durante a fase exponencial, as análises mostraram uma invariabilidade para os cultivos estudados. Porém, na fase estacionária, os cultivos submetidos ao estresse, indicaram menores rendimentos em biomassa. Observou-se um amento de 32,5% nos níveis de carboidratos e de 87,68% no teor de lipídeos na razão N:P 5,0 e uma redução média de 65% de proteína nas razões N:P 5,0 ou 2,5. Não houve variações significativas no teor de cinzas, independente das condições de cultivo e fase de crescimento. Apesar da limitação de biomassa, o aumento do acúmulo de lipídios pelas culturas estressadas, proporcionou maiores produtividades de lipídios, conseqüentemente este estudo sugere a utilização da microalga Isochrysis galbana como fonte alternativa para a produção de biocombustível 2014-12-17T15:01:24Z 2011-11-17 2014-12-17T15:01:24Z 2010-12-21 masterThesis CHAGAS, Bruna Maria Emerenciano das. Influência do estresse nutricional programado na composição da microalga isochrysis galbana. 2010. 131 f. Dissertação (Mestrado em Pesquisa e Desenvolvimento de Tecnologias Regionais) - Universidade Federal do Rio Grande do Norte, Natal, 2010. https://repositorio.ufrn.br/jspui/handle/123456789/15802 por Acesso Aberto application/pdf application/pdf Universidade Federal do Rio Grande do Norte BR UFRN Programa de Pós-Graduação em Engenharia Química Pesquisa e Desenvolvimento de Tecnologias Regionais

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