ECOTOXICOLOGICAL BIOASSAYS IN QUANTUM DOTS NANOPARTICLES WITH THE MICROALGAE Pseudokirchneriella subcapitata

Abstract

Quantum dots (QDs) nanoparticles are increasingly being used for electronics devices, solar energy generation and medical imaging applications. While the new properties of nanoparticles are more and more studied, little is known about their interactions with aquatic organisms. As a primary producer, phytoplankton serves as an important component of the aquatic ecosystem. According to our bibliographic search, no reports were found on the evaluation of ecotoxicity of QDs in Pseudokirchneriella subcapitata. In this study, QDs were evaluated using ecotoxicological bioassays (cellular toxicity models and potential indicators of the impact in aquatic ecosystems) with the microalgae P. subcapitata. With ecotoxicity concentrations of 0, 1, 2, 3 and 4 nM of QDs with P. subcapitata at 96 h exposure a mean inhibitory concentration of growth (IC50) of the microalgae P. subcapitata IC50 = 1,94 nM of QDs(a) was obtained for orange fluorescence; IC50 = 1.68 nM of QDs(r) for red fluorescence, and IC50 = 2.03 nM of QDs(v) for green fluorescence, observing the following order of sensitivity: QDs (r) ˃ QDs (a) ˃ QDs (v). The toxicity of the QDs are evident by the type of fluorescence detected in the standard solution 4 M of QDs and 10-1 M. The images of confocal microscopy of fluorescence showed adhesions of QDs in microalgal cells until low concentrations with high growth rates of P. subcapitata at concentrations of 1 nM compared to concentrations of 10-1 M of QDs nanoparticles with low growth rates. Palabras clave: crecimiento, fluorescencia, sensibilidad, toxicidad RESUMEN Las nanopartículas de puntos cuánticos (QD, por sus siglas en inglés) se utilizan para dispositivos electrónicos, generación de energía solar y aplicaciones de imágenes médicas. Si bien las nuevas propiedades de las nanopartículas se estudian cada vez Short communication / Comunicación breve

Responses of <em>Selenastrum capricornutum</em>, <em>Eisenia fetida</em>, <em>Brassica nigra</em> and <em>Sorghum bicolor</em> to sent phone battery toxicity

“…The algal growth inhibition test was carried out according to the methods of Huarachi-Olivera et al (2019) with slight modifications. Four nutrient stock solutions were appropriately added to sterile distilled water to prepare the algal growth medium and were inoculated with 1 mL pure culture broth of Selenastrum capriconutum (5 x 104 cells/mL).…”