Síntesis de un composite de almidón de arracacha (Arracacia xanthorrhiza) / Cu para la detección de mezclas etanol y metanol

Abstract

Arracacha starch is presented as a sustainable alternative to synthetic polymers for the production of biofilms. In this study, arracacha starch was obtained with a dry yield of 5.56 ± 0.58%. Stable biofilms were developed using this starch, rosemary hydrolate and copper nanoparticles. Copper nanoparticles with sizes of 16.82 ± 2.71 nm and 34.067 ± 1.007 nm were synthesized and incorporated into the biofilms to facilitate the construction of a biodegradable sensor. This sensor was fabricated by embedding the biofilm in a hollow epoxy resin foil, connected to two copper wires from the sensing window. The biofilms exhibited remarkable thermal stability, reaching temperatures of 345.07°C for the starch biofilm, and 345.07°C and 357.22°C for the biofilms with hydrolate and nanoparticles, respectively. The permeability of the biofilms was determined to be 5.69 ± 0.42 1018 g-mm/m²-kPa-h. The sensor demonstrated efficacy in detecting adulterated alcohol at the laboratory level. Detection limits were determined for ethanol-methanol (2.26 ± 0.23% by weight) and methanol-ethanol-water mixtures (2.31 ± 0.12% by weight). By weight). The limits of quantification were set at 4.62 ± 0.21% and 0.462 ± 0.21 % methanol for both mixtures, respectively.