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Identifier 000364149
Title Βιοενεργητική στρατηγική βιοσύνθεσης λιπαρών οξέων του μικροφύκους Scenedesmus obliquus για την παραγωγή βιοντίζελ
Alternative Title Bioenergetic strategy of the microalga Scenedesmus obliquus in the biosynthesis of lipids for biodiesel production
Author Καραμαλάκη, Αμαλία
Thesis advisor Κοτζαμπάσης, Κυριάκος
Abstract The present work is focused on the research of the best possible growing conditions of the unicellular green alga Scenedesmus obliquus for maximal synthesis of lipids that can be used for biodiesel production. The experimental results from microalgae cultures grown mixotrophically, showed significantly high amount of lipids, expressed as percentage of cellular dry weight, compared with corresponding cultures grown autotrophically and heterotrophically. Abiotic stress conditions (such as differentiation of temperature and salinity) did not change significantly the cellular content of lipids, except for the optimal growth conditions (increased biomass) of the mixotrophic culture, where it can be observed an indirect increase of lipids level per culture. The experimental approaches of the present work gave significantly high amount of lipids expressed as percentage of dry weight of algae that were grown mixotrophically in conditions of lack of nitrogen [- N] (25%), phosphor [- P] (16%) and a combination of both [- N/P] (32%). Despite these high concentrations in the treatments [- N] and [- N/P], they are not biotechnologically exploitable due to the extremely low growth of the cultures. An alternative biotechnological exploitation could be the growth of cultures in complete growth medium, up to the maximum growth and afterwards imposition of combinational lack of nitrogen and phosphor. In this way, very high amounts of lipids also per culture could be achieved.
Language Greek
Subject Λιπαρά
Μικροφύκος Scenedesmus obliquus
Issue date 2011-03-18
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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