Bioactive Chemicals in Microalgae

Skulberg, Olav M.

doi:10.1002/9780470995280.ch30

Cited by 15 publications

(12 citation statements)

References 99 publications

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“…However, cultures of H. pluvialis show slow growth rate, low biomass density, and high sensitivity to contamination (Hagen et al 2001;Cysewski and Lorenz 2004). Other species, as Scenedesmus, have been found to have rapid growth and resistance to contamination (Lee 2001;Skulberg 2004). They may, therefore, offer an advantage to be used in future studies for carotenoid production (Qin et al 2008).…”

Section: Introductionmentioning

confidence: 97%

Carotenoid production and change of photosynthetic functions in Scenedesmus sp. exposed to nitrogen limitation and acetate treatment

et al. 2011

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Under stress conditions, some microalgae upregulate certain biosynthetic pathways, leading to the accumulation of specific compounds. For example, changing nutrient composition can induce stress in algae's physiological activities, which may trigger an intense increase in carotenoid production. In this study, the change of photosynthetic functions and carotenoid production in the green microalga Scenedesmus sp. was investigated when algal cultures were exposed to conditions including limited nitrogen content with the addition of sodium acetate. Microalgal cultures were treated for 18 days under higher irradiance conditions. We observed a decrease of chlorophyll content induced concomitantly with a decline of photosystem II and I photochemistry. At the same time, an important increase in carotenoid content was detected. By using high-performance liquid chromatographic analysis, we found that the secondary carotenoids astaxanthin and canthaxanthin were accumulated compared to controls. During the process of carotenoid accumulation, chlorophyll degradation was found in addition to a strong decrease in photosynthetic electron transport. Such changes may be associated with the structural reorganization of the photosynthetic apparatus and can be a useful indicator of secondary carotenoid accumulation in algal cultures.

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Section: Introductionmentioning

confidence: 97%

Carotenoid production and change of photosynthetic functions in Scenedesmus sp. exposed to nitrogen limitation and acetate treatment

et al. 2011

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“…A variety of compounds have been suggested for having antibacterial activity, such as fatty acids (Desbois, Mearns-Spragg & Smith 2009), terpenoids, carbohydrates (Duff & Bruce 1966), peptides, polysaccharides and alkaloids (Borowitzka 1995). The production of secondary metabolites is usually higher when culture conditions are unfavourable (Skulberg 2004).…”

Section: Introductionmentioning

confidence: 99%

Antibacterial activity in microalgae cultures

et al. 2011

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Five cultures of microalgae (Chlorella minutissima, Tetraselmis chui, Nannochloropsis sp., Arthrospira platensis and Isochrysis sp.) with no culturable bacteria were tested for their ability to inhibit the growth of six Vibrio bacterial strains (V. parahaemolyticus, V. anguillarum, V. splendidus, V. scophthalmi, V. alginolyticus and V. lentus). The influence of light on the antibacterial activity of the microalgae was investigated. All microalgae cultures inhibited the growth of bacteria compared with the control treatments (P < 0.05), and their antibacterial activity was not influenced by the presence or absence of light. In the control groups, the numbers of bacteria increased exponentially during the experimental period in the absence of microalgae cells demonstrating that the bacterial cells were able to utilize the growth medium of microalgae cultures. The present results may explain the low levels or absence of Vibrio strains in microalgae cultures, and the positive effect of addition of microalgae in rearing of fish larvae, and implicate the production of antibacterial compounds by microalgae cells.

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“…[1][2][3] Several studies describe the potential use of these microorganisms to produce bioactive compounds of high values. [4][5][6][7] Current applications for the isolated chemical compounds from various kinds of algae are enormous, and within those, ecological and functional chemistry is outstanding.…”

Section: Introductionmentioning

confidence: 99%

Production of indole-3-acetic acid in the culture medium of microalga Scenedesmus obliquus (UTEX 393)

Prieto¹,

Córdoba²,

MONTENEGRO³

et al. 2011

J. Braz. Chem. Soc.

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O acido indolacético (IAA) é uma auxina natural e um dos principais reguladores do crescimento de plantas superiores. A quantidade de ácido indolacético extracelular produzida pela cultura de microalga verde Scenedesmus obliquus foi estabelecida por cromatografia líquida de alta eficiência (HPLC). Avaliou-se o efeito de três variáveis de processo na produção de IAA extracelular nestas culturas usando planejamento fatorial 2 3 para uma metodologia de screening. As variáveis de planejamento experimental foram agitação, iluminância (intensidade do fluxo luminoso) e fonte de carvão (mistura CO 2 /air v/v (%)) em três diferentes níveis. A concentração de IAA e a taxa de crescimento específico foram usadas como variáveis de resposta. As análises de HPLC mostraram que em condições experimentais, a quantidade de IAA que foi liberada no meio pela alga S. obliquus depende somente da variável iluminância. Os efeitos da luz e as concentrações de carvão no meio de cultura foram significantes (p < 0.05) para uma taxa de crescimento específico.The indoleacetic acid (IAA) is a natural auxin and one of the main growth regulators in higher plants. The extracellular indoleacetic acid (IAA) amount produced by the green microalga Scenedesmus obliquus culture was detected by high performance liquid chromatography (HPLC). It was evaluated the effect of three process variables in the extracellular IAA production in these cultures using 2 3 factorial design for screening methodology. The experimental design variables were agitation, illuminance (intensity of luminous flux) and carbon source (CO 2 /air v/v (%) mixture) at three different levels. The IAA concentration and the specific growth rate were used as response variables. The HPLC analyses showed that under experimental conditions, the IAA amount that is released to the medium by S. obliquus depends only on the illuminance variable. The light effects and the carbon concentrations in culture medium were significant (p < 0.05) for specific growth rate.

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Bioactive Chemicals in Microalgae

Cited by 15 publications

References 99 publications

Carotenoid production and change of photosynthetic functions in Scenedesmus sp. exposed to nitrogen limitation and acetate treatment

Carotenoid production and change of photosynthetic functions in Scenedesmus sp. exposed to nitrogen limitation and acetate treatment

Antibacterial activity in microalgae cultures

Production of indole-3-acetic acid in the culture medium of microalga Scenedesmus obliquus (UTEX 393)

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