P.A. González-Moreno

Universidad de Almería, Unci, Andalusia, Spain

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Publications (2)12.54 Total impact

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    ABSTRACT: The aim of this work was to optimize the production of fatty acid methyl esters (FAMEs, biodiesel) from marine Nannochloropsis gaditana wet microalgal biomass (25 wt% dry biomass and 11.1 wt% saponifiable lipids, SLs, of dry biomass) by direct acid catalyzed methylation of SLs in the microagal biomass and extraction of FAMEs with hexane. The best FAME yield was attainted with a methanol/SL ratio of 171.1 mL/g, an acetyl chloride (catalyst) concentration of 5% (v/v), 100 °C and a reaction time of 105 min. In these conditions 100% of SLs were transformed to FAMEs. Similar yields were obtained at lower temperatures and higher reaction times. The pretreatment of wet biomass by homogenization did not improve the above results. Finally, the FAME purity was increased from 74.5 to 82.7 wt% by a treatment of adsorption with bentonite.
    No preview · Article · Jun 2015 · Fuel
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    A Robles-Medina · P.A. González-Moreno · L Esteban-Cerdán · E Molina-Grima
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    ABSTRACT: The cost of lipases and the relatively slower reaction rate remain as the major obstacles for enzymatic production of biodiesel as opposed to the conventional chemical processes. This paper reviews the starting oils usually employed in biodiesel production, the processes for transforming them to biodiesel placing particular emphasis on enzymatic transesterification. The pros and cons of the lipase-based process, the key operational variables and the technological alternatives for attenuating lipase deactivation are also discussed. Finally, suggestions are made for future studies, paying particular attention to the use of whole cell immobilization in the production process, as this methodology may reduce both the cost of the biocatalyst and dependence on lipase manufacturers.
    Full-text · Article · Apr 2009 · Biotechnology advances