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Exploring Pavlova pinguis and Hemiselmis cf. andersenii as natural sources of high-value lipids
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Advisor(s)
Abstract(s)
A crescente demanda dos consumidores por fontes naturais e sustentáveis de
compostos de valor acrescentado tem levado as comunidades científica e industrial a explorar
a biodiversidade das microalgas e a sua diversidade química. Na bioprospecção de microalgas
para a produção integrada de biomassa e compostos de valor acrescentado, diversos desafios
são encontrados, como o cultivo de novas espécies, a identificação de novas moléculas e a
otimização das condições de cultivo para a produção dos fitoquímicos desejados. Este estudo
investiga o potencial de duas microalgas inexploradas, Hemiselmis cf. andersenii e Pavlova
pinguis, como fontes de lípidos com valor acrescentado para aplicação na indústria
nutracêutica e áreas relacionadas. A análise dos extratos lipídicos revelou uma grande
diversidade de metabolitos sintetizados pela H. cf. andersenii e pela P. pinguis, nomeadamente
ácidos gordos, esteróis, álcoois e monoglicerídeos. H. cf. andersenii demonstrou ser rica em
ómega-3 polinsaturados. Enquanto, a P. pinguis revelou ser uma grande produtora de
fitoesteróis. Para verificar a robustez das microalgas e induzir a acumulação dos compostos
desejados, foram realizados estudos com diferente suplementação de azoto e de fósforo no
meio de crescimento das microalgas. As condições repletas de azoto revelaram-se eficazes
para modelar a composição lipídica das microalgas para as indústrias nutracêutica e
farmacêutica. Aumentos dos teores de fósforo induziram um aumento da produtividade da
biomassa e da produção de lípidos nutricionalmente relevantes. Na P. pinguis, baixos teores de
fósforo mostraram-se eficazes para a produção de carotenoides e açúcares. A H. cf. andersenii
mostrou-se promissora para a coprodução de carotenoides e lípidos. A análise multivariada
permitiu visualizar os efeitos intra e interespecíficos dos nutrientes na composição lipídica das
microalgas. A grande versatilidade de compostos de valor acrescentado produzidos pelas
microalgas estudadas aliadas às suas características biológicas (ausência de parede celular
rígida), fazem destas candidatas promissoras para futura produção à escala industrial.
The active seek of consumers for natural sustainable sources of high-value compounds has driven the scientific and industry communities to exploit microalgal biodiversity and its intrinsic chemical diversity. In the bioprospection of microalgae for integrated biomass and high value compounds production, several challenges are found, like the cultivation of new species, the identification of new molecules, and the optimization of culture conditions to produce the desired phytochemicals. The present work aimed to investigate the potential of two unexplored microalgae, Hemiselmis cf. andersenii e Pavlova pinguis, as sources of high-value lipids for further application in nutraceutical and other related fields. The detailed analysis of lipid extracts revealed a great diversity of metabolites synthesized by H. cf. andersenii and P. pinguis, namely fatty acids, sterols, alcohols, and monoglycerides. H. cf. andersenii was shown to be a rich source of omega-3 polyunsaturated fatty acids. Meanwhile, P. pinguis was found to be a high level producer of phytosterols. To evaluate the robustness of the microalgae and induce its production on high-value lipids, experiments were performed by inducing changes in nitrogen and phosphorus levels in microalgae growth medium. In both microalgae nitrogen-replete conditions were the most effective for modeling the lipid composition for nutraceutical and pharmaceutical industries. Increases in phosphorus concentrations prompted an increase in microalgal biomass productivity, as well as the production of nutritionally relevant lipids. In P. pinguis, low phosphorus concentrations were effective to produce carotenoids and sugars. H. cf. andersenii have shown to be suitable for the co-production of carotenoids and lipids. Multivariate analysis allowed to visualize the differential intra- and inter- specific effects of nitrogen and phosphorus on microalgal lipid composition. The great versatility of value-added compounds produced by the studied microalgae combined with its biological properties (absence of a rigid cell wall) make these microalgae promising candidates for future large-scale production.
The active seek of consumers for natural sustainable sources of high-value compounds has driven the scientific and industry communities to exploit microalgal biodiversity and its intrinsic chemical diversity. In the bioprospection of microalgae for integrated biomass and high value compounds production, several challenges are found, like the cultivation of new species, the identification of new molecules, and the optimization of culture conditions to produce the desired phytochemicals. The present work aimed to investigate the potential of two unexplored microalgae, Hemiselmis cf. andersenii e Pavlova pinguis, as sources of high-value lipids for further application in nutraceutical and other related fields. The detailed analysis of lipid extracts revealed a great diversity of metabolites synthesized by H. cf. andersenii and P. pinguis, namely fatty acids, sterols, alcohols, and monoglycerides. H. cf. andersenii was shown to be a rich source of omega-3 polyunsaturated fatty acids. Meanwhile, P. pinguis was found to be a high level producer of phytosterols. To evaluate the robustness of the microalgae and induce its production on high-value lipids, experiments were performed by inducing changes in nitrogen and phosphorus levels in microalgae growth medium. In both microalgae nitrogen-replete conditions were the most effective for modeling the lipid composition for nutraceutical and pharmaceutical industries. Increases in phosphorus concentrations prompted an increase in microalgal biomass productivity, as well as the production of nutritionally relevant lipids. In P. pinguis, low phosphorus concentrations were effective to produce carotenoids and sugars. H. cf. andersenii have shown to be suitable for the co-production of carotenoids and lipids. Multivariate analysis allowed to visualize the differential intra- and inter- specific effects of nitrogen and phosphorus on microalgal lipid composition. The great versatility of value-added compounds produced by the studied microalgae combined with its biological properties (absence of a rigid cell wall) make these microalgae promising candidates for future large-scale production.
Description
Keywords
Microalgas Lípidos Fitoquímicos Nutracêutica Compostos de valor acrescentado Bioprospeção Microalgae Lipids Phytochemicals Nutraceutical High-value compounds Bioprospection Chemistry - speciality in Biochemistry . Faculdade de Ciências Exatas e da Engenharia