No abstract

No abstract

Biodiesel production from microalgae triacylglycerols is growing, because this feedstock is a more sustainable and advantageous alternative. In this study, we isolated and identified fourteen strains of native microalgae from the Peruvian Amazon. These strains showed great heterogeneity in biomass productivity, lipid productivity and lipid content, and thus, three of them (Acutodesmus obliquus, Ankistrodesmus sp. and Chlorella lewinii) were selected for further evaluation under culture of nitrogen-sufficient (+N) and nitrogen-deficient (−N) Chu medium No. 10. These microalgae species showed modifications in biomolecule content (protein, lipid and carbohydrate) with a pronounced increase of lipids and carbohydrate and a decrease of protein content under stress culture. Furthermore, the fatty acid profile was peculiar for each species, and these patterns showed evident changes, particularly in the proportion of saturated and monounsaturated fatty acids. The results of this research suggest that the isolated native microalgae, from the Peruvian Amazon, could be suitable candidates for biodiesel production.

En el presente estudio se reportan los conocimientos ancestrales indígenas (etnoconocimientos) de la comunidad indígena Tikuna de Cushillo Cocha. La comunidad está ubicada en la provincia de Ramón Castilla, al nororiente de la Región Loreto, Perú. La recolección de datos se realizó a través de talleres participativos, entrevistas y recorridos biológicos para realizar la recolectar de especies vegetales, observar a animales in situ, acompañados por los pobladores con experiencia y conocimiento de su territorio. Un total de 247 especies de flora y fauna fueron registradas. En etnobotánica se identificaron 101 especies, en siete categorías de uso asignados por los pobladores, siendo las categorías de alimentación y medicinal las de mayor representatividad. Para el caso de etnozoología se identificaron 146 especies, que son utilizadas en seis categorías, siendo las de mayor relevancia las categorías de alimentación y mascotas. Se evidenció que el bosque es la fuente principal para la alimentación, cura de enfermedades, elaboración de artesanías, como mascotas para la venta y plantas como ornamentales, todo esto con importante aceptación por parte de la población indígena.

The lichen species Cladonia chlorophaea and C. gracilis (Cladoniaceae) are widely distributed in the island archipelago of maritime Antarctica and represent a natural resource of scientific interest. In this work, the metabolomic characterization of the ethanolic extracts of these species and the determination of the antioxidant activity, enzymatic inhibition and anti-inflammatory potential of selected compounds on the 5-lipoxygenase enzyme by molecular docking and cytoprotective activity in the SH-SY5Y cell line were carried out. Nineteen compounds were identified by liquid chromatography coupled with quadrupole-time-of-flight mass spectrometry (UHPLC-ESI-QTOF-MS) in each of the species. The contents of phenolic compounds, antioxidant activity, the inhibition of cholinesterases (acetylcholinesterase and butyrylcholinesterase) and digestive enzymes (α-glucosidase and pancreatic lipase) were variable among species, with better results in C. chlorophaea. Molecular docking evidenced significant binding affinities of some compounds for the 5-lipoxygenase enzyme, together with outstanding pharmacokinetic properties. Both extracts were shown to promote cell viability and a reduction in reactive oxygen species production in an H2O2-induced oxidative stress model. This study contributes to the chemical knowledge of the Cladonia species and demonstrates the biological potential for the prevention and promising treatment of central nervous system pathologies, inflammatory disorders and metabolic alterations.