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artículo
Publicado 2025
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The industrial applications of unused natural resources are a key issue in sustainability research. Here we describe the extraction of the biopolymer ulvan, a sulfated polysaccharide, from the green alga Ulva papenfussii. Two different extraction techniques, hot water extraction and alkaline extraction, were used. Ulvan extracted using the hot water extraction method, featured an extraction yield of 29% and a sulfate content of 50% while alkaline extraction produced a yield of 21% and a sulfate content of 28%. The ulvan obtained via hot water extraction also showed a more homogeneous molecular weight distribution than the ulvan obtained with the alkaline extraction method. Flat rectangular films were prepared for characterization using a casting technique. The films prepared using hot water-extracted ulvan displayed lower glass transition and thermal degradation temperatures compared to ...
2
artículo
Publicado 2023
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La presencia de ácido sulfhídrico (H2S) en el medio ambiente representa un peligro para la salud de las personas. Los métodos convencionales para la detección de H2S requieren del uso de soluciones captadoras, las cuales contienen sulfato de cadmio (CdSO4), hidróxido de sodio (NaOH) y arabinogalactano, que a su vez puede provocar daños en la salud por una constante exposición. En el presente trabajo se validó el uso de polisacáridos Ulvan, como aditivo reemplazante en la preparación de la solución absorbente del contaminante gaseoso ácido sulfhídrico (H2S) según la metodología COVENIN 3571:2000 Calidad de aire. Determinación de la concentración sulfuro de hidrogeno (H2S(g)) en la atmosfera. Los resultados obtenidos en la validación del método modificado (porque se modificó la solución absorbente) fueron analizados a través de parámetros como linealidad, precisión,...
3
artículo
We used starches from two different Andean-native tubers to prepare nano-sized particles, and tested their ability to stimulate inflammatory reactions in human monocytes. Our data show that the release of inflammatory cytokines by monocytes can be differentially modulated by the administration of non-toxic doses of nanoparticles synthesized from the starch of the Andean sub-species Solanum tuberosum and Solanum goniocalyx. Furthermore, we observed a starch-nanoparticle-specific increase in inflammatory chemokine-dependent migration, and an up-regulation of immunoglobulin receptor CD16. Based on this preliminary study, we conclude that different potato starch nanoparticles possess specific properties that can induce immune responses and may be employed as immune modulators in the future.
4
artículo
Publicado 2021
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In the present contribution, two nationwide surveys of personal protective equipment (PPE) pollution were conducted in Peru and Argentina aiming to provide valuable information regarding the abundance and distribution of PPE in coastal sites. Additionally, PPE items were recovered from the environment and analyzed by Fourier transformed infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM) with Energy dispersive X-ray (EDX), and X-ray diffraction (XRD), and compared to brand-new PPE in order to investigate the chemical and structural degradation of PPE in the environment. PPE density (PPE m− 2 ) found in both countries were comparable to previous studies. FTIR analysis revealed multiple polymer types comprising common PPE, mainly polypropylene, polyamide, polyethylene terephthalate, and polyester. SEM micrographs showed clear weathering signs, such as cracks, cavities, and r...
