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Evaluation of the Impact of Moderate...

Barreiros, Mariana Pereira,

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Evaluation of the Impact of Moderate Electric Fields on the Cultivation of Microalgae /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Evaluation of the Impact of Moderate Electric Fields on the Cultivation of Microalgae // Mariana Pereira Barreiros.
Author:	Barreiros, Mariana Pereira,
Description:	1 electronic resource (131 pages)
Notes:	Source: Masters Abstracts International, Volume: 86-08.
Contained By:	Masters Abstracts International86-08.
Subject:	Molecular biology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31884242
ISBN:	9798302854889

Evaluation of the Impact of Moderate Electric Fields on the Cultivation of Microalgae /
Barreiros, Mariana Pereira,

Evaluation of the Impact of Moderate Electric Fields on the Cultivation of Microalgae /Mariana Pereira Barreiros. - 1 electronic resource (131 pages)

Source: Masters Abstracts International, Volume: 86-08.

Microalgae, a largely diverse group of organisms found in marine and freshwater environments, provide a variety of added-value products, namely pigments, antioxidants, polysaccharides, triglycerides, fatty acids, vitamins and biomass, that can be harnessed for commercial use in the feed, food, nutritional, cosmetic, pharmaceutical and fuel industries. Environmental factors, such as light, temperature, nutrient availability and salinity, influence microalgae at several levels, leading to alterations in the metabolic patterns, biochemical composition and biomass productivity that can be explored as stress strategies to promote the accumulation of compounds of interest. The influence of electric field processing on biological systems such as microalgae has been the topic of thorough investigation. Moderate electric field (MEF) application, low intensity electric fields ranging between 1-1000 V cm-1 in the form of sinusoidal/square waves, although thoroughly used in the food industry and in aiding extraction and microalgae biotechnology, is still scarce in the literature when compared to other electrotechnologies, with fundamental studies on its influence on microalgae growth being particularly limited.In the present work, the influence of MEF application on the growth of Pavlova gyrans, a unicellular microalgae mainly used in the feedstock market due to its biochemical composition and nutritional value, was assessed. Using different approaches, by applying the treatment in different growth stages, in varying treatment times and even during the dark phase of its photoperiod, possible alterations in P. gyrans growth and biochemical composition as a result of the stress caused by electric field application were investigated.Despite not promoting growth, MEF treatment influenced the biochemical composition and pigment content of P. gyrans - maximum increases of 85.8 and 66.1% in the Chlorophyll a and in the Carotenoid content and of 4.72, 18.7 and 5.41% in the lipid, carbohydrate and protein content were found as a result of treatment in separate experiments. Hence, with this study, the potential of MEF application in the promotion of biochemical composition alterations was proven.In the future, besides validating the results found, other approaches could be taken, for instance combining electric stress with other known stress strategies and applying electrotechnologies in the harvesting of compounds of interest from P. gyrans. Further investigation is also necessary in order to fully understand the fundamental causes at a cellular level of the effects found.

English

ISBN: 9798302854889Subjects--Topical Terms:

517296
Molecular biology.
Subjects--Index Terms:

Pavlova gyrans

Evaluation of the Impact of Moderate Electric Fields on the Cultivation of Microalgae /
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520 $a Microalgae, a largely diverse group of organisms found in marine and freshwater environments, provide a variety of added-value products, namely pigments, antioxidants, polysaccharides, triglycerides, fatty acids, vitamins and biomass, that can be harnessed for commercial use in the feed, food, nutritional, cosmetic, pharmaceutical and fuel industries. Environmental factors, such as light, temperature, nutrient availability and salinity, influence microalgae at several levels, leading to alterations in the metabolic patterns, biochemical composition and biomass productivity that can be explored as stress strategies to promote the accumulation of compounds of interest. The influence of electric field processing on biological systems such as microalgae has been the topic of thorough investigation. Moderate electric field (MEF) application, low intensity electric fields ranging between 1-1000 V cm-1 in the form of sinusoidal/square waves, although thoroughly used in the food industry and in aiding extraction and microalgae biotechnology, is still scarce in the literature when compared to other electrotechnologies, with fundamental studies on its influence on microalgae growth being particularly limited.In the present work, the influence of MEF application on the growth of Pavlova gyrans, a unicellular microalgae mainly used in the feedstock market due to its biochemical composition and nutritional value, was assessed. Using different approaches, by applying the treatment in different growth stages, in varying treatment times and even during the dark phase of its photoperiod, possible alterations in P. gyrans growth and biochemical composition as a result of the stress caused by electric field application were investigated.Despite not promoting growth, MEF treatment influenced the biochemical composition and pigment content of P. gyrans - maximum increases of 85.8 and 66.1% in the Chlorophyll a and in the Carotenoid content and of 4.72, 18.7 and 5.41% in the lipid, carbohydrate and protein content were found as a result of treatment in separate experiments. Hence, with this study, the potential of MEF application in the promotion of biochemical composition alterations was proven.In the future, besides validating the results found, other approaches could be taken, for instance combining electric stress with other known stress strategies and applying electrotechnologies in the harvesting of compounds of interest from P. gyrans. Further investigation is also necessary in order to fully understand the fundamental causes at a cellular level of the effects found.
520 $a As microalgas, um diverso grupo de organismos presentes em ambientes marinhos e de agua doce, sao a fonte de uma multiplicidade de produtos de valor acrescentado, como pigmentos, antioxidantes, polissacaridos, trigliceridos, acidos gordos, vitaminas e biomassa, que podem ser empregues comercialmente nas industrias alimentar, nutricional, cosmetica, farmaceutica e combustivel. Fatores ambientais como luz, temperatura, disponibilidade de nutrientes e salinidade influenciam as microalgas, provocando alteracoes nos seus padroes metabolicos, composicao bioquimica e produtividade em biomassa, podendo ser exploradas como estrategias de stresse para promover a acumulacao de compostos de interesse.O processamento com campos eletricos de sistemas biologicos como as microalgas tem sido alvo de exaustiva investigacao. Os campos eletricos moderados (MEF), campos de baixa intensidade na gama 1-1000 V cm-1 na forma de ondas sinusoidais/quadradas, apesar de frequentemente usados na industria alimentar e como auxilio na extracao e biotecnologia de microalgas, sao ainda pouco referidos na literatura comparativamente as restantes eletrotecnologias. Estudos fundamentais sobre a sua influencia no crescimento de microalgas sao particularmente limitados. No presente trabalho, a influencia de MEF no crescimento de Pavlova gyrans, uma microalga unicelular usada sobretudo na maricultura dada a sua composicao bioquimica e valor nutricional, foi investigada. Usando diferentes estrategias, como a aplicacao do campo em diferentes fases do crescimento, variando o tempo de aplicacao e ate aplicando o tratamento durante a fase escura do fotoperiodo, possiveis alteracoes no crescimento e composicao bioquimica de P. gyrans como resultado do stresse causado pela aplicacao do campo eletrico foram investigadas.Apesar de nao promover o crescimento, o tratamento com MEF influenciou a composicao bioquimica de P. gyrans - aumentos maximos de 85,8 e 66,1% no conteudo em Clorofila a e Carotenoides e de 4,72, 18,7 e 5,41% no conteudo em lipidos, hidratos de carbono e proteinas resultaram de diferentes tratamentos em ensaios separados. Desta forma, o potencial da aplicacao de MEF na promocao de alteracoes na composicao bioquimica foi demonstrado.Futuramente, para alem de validar os resultados encontrados, diferentes estrategias como a combinacao de estrategias eletricas com stresses conhecidos e a aplicacao de eletrotecnologias na extracao de compostos de interesse de P. gyrans poderiam ser investigadas. Mais investigacao acerca da causa fundamental a nivel celular das alteracoes encontradas e ainda necessaria.
546 $a English
590 $a School code: 5895
650 4 $a Molecular biology. $3 517296
650 4 $a Bioengineering. $3 657580
653 $a Pavlova gyrans
653 $a Microalgae
653 $a Moderate electric field
690 $a 0202
690 $a 0307
710 2 $a Universidade do Minho (Portugal). $e degree granting institution. $3 3765699
720 1 $a Pereira, Ricardo Nuno Correia $e degree supervisor.
720 1 $a Cunha, Ana Cristina Gomes $e degree supervisor.
773 0 $t Masters Abstracts International $g 86-08.
790 $a 5895
791 $a Master's
792 $a 2021
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31884242