En la ciudad del Cusco, los pescados constituyen una fuente principal de nutrientes de la dieta familiar de la población, sin embargo, la contaminación ambiental por efecto antropogénico repercute en su inocuidad muchas veces afectada por la presencia de metales pesados por lo que el objetivo principal de esta investigación fue evaluar la concentración de Mercurio (Hg), Plomo (Pb), Cadmio (Cd) y Arsénico (As) en tejidos de cabeza, piel, hueso y músculo donde posiblemente exista bioacumulación de estos metales en pescados comercializados en los principales centros de abastos (Vinocanchon, Wanchaq, General Buendía). Se utilizo el método de espectrometría de Emisión Óptica por plasma de acoplamiento inductivo ICP-OES para cuantificar la presencia de plomo (Pb), Cadmio (Cd) y Arsénico (As), y el método de espectrofotometría de Absorción Atómica con vapor frío para el mercu...

Los detergentes de sulfonato de alquilbenceno lineal (LAS) son utilizados en grandes cantidades en la sociedad moderna, industrias y hogares pasan a las aguas superficiales a través de escorrentías y desbordamientos combinados de alcantarillas, entre otras fuentes, sin embargo se desconoce su destino final. El rio Huatanay que atraviesa la ciudad del Cusco está altamente contaminada por efecto del vertido de aguas servidas directamente al río, uno de los contaminantes presentes es el tensioactivo aniónico tipo ácido dodecil benceno sulfónico lineal (LAS) cuya presencia de determinó utilizando un método estándar de análisis SMEWW-APHA-AWWA-WEF Anionic Surfactants as MBAS. Se tomaron 40 muestras de diferentes tributarios del rio seleccionados de acuerdo al Protocolo Nacional-ANA, en dos estaciones del año, seco y lluvioso. Los resultados indican que las concentraciones de deter...

En la ciudad del Cusco, los pescados constituyen una fuente principal de nutrientes de la dieta familiar de la población, sin embargo, la contaminación ambiental por efecto antropogénico repercute en su inocuidad muchas veces afectada por la presencia de metales pesados por lo que el objetivo principal de esta investigación fue evaluar la concentración de Mercurio (Hg), Plomo (Pb), Cadmio (Cd) y Arsénico (As) en tejidos de cabeza, piel, hueso y músculo donde posiblemente exista bioacumulación de estos metales en pescados comercializados en los principales centros de abastos (Vinocanchon, Wanchaq, General Buendía). Se utilizo el método de espectrometría de Emisión Óptica por plasma de acoplamiento inductivo ICP-OES para cuantificar la presencia de plomo (Pb), Cadmio (Cd) y Arsénico (As), y el método de espectrofotometría de Absorción Atómica con vapor frío para el mercu...

The surfactants linear alkylbenzene sulfonate (LAS), is used in large quantities in modern society, and wastewater containing it can contaminate groundwaters through runoff and sewers. The study aimed to determine the level of LAS in the Huatanay river; in Cusco city, Peru. Water samples were taken from nine points along the river, in the rainy and dry season in 2018. LAS surfactants were determined spectrometrically using methylene blue as indicator; dissolved oxygen (DO) and conductivity were also determined; both were correlated through Pearson coefficient at 5% significance, and analyzed in triplicate. The concentration of LAS in the dry season varied between 0.01 to 23.17 mg/L and in rains from 0.09 to 1.47 mg/L; the DO level shows values between 0.11 to 5.04 mg O2/L, and the conductivity varied from 777.7 to 2688.9 µS/cm. In conclusion, high levels of LAS considerably decrease the...

Chocolate is a widely consumed product, due to the contribution of fats and antioxidant compounds; the addition of other components makes it possible to increase the content of polyunsaturated fatty acids, although they can affect its rheological properties. The influence of the partial addition of peanut paste and Sacha Inchi on the rheological and functional properties of dark chocolate was evaluated. Cocoa beans, peanuts, and Sacha Inchi were refined in order to obtain the cocoa paste (PC), peanut paste (PM), and Sacha Inchi paste (PSI). Then, mixtures between 0 to 20% of PM and PSI were formulated, and the rheological properties were evaluated at 30, 40, and 50 C; these were adjusted to mathematical models. Functional groups were identified by FTIR in ATR mode, and it was observed that the partial addition of PM and PSI did not show significant changes in the shear stress and apparen...

The removal of heavy metals from wastewater is an environmental challenge which demands the use of environmentally friendly materials that promote a circular economy. This study aimed to apply a novel composite of an activated nanoclay/hydrocolloid in the removal of heavy metals from wastewater. A composite blended under pressure was prepared with spray-dried hydrocolloid derived from Nostoc sphaericum algae and activated nanoclay in an acid medium and 1M NaCl. The composite and components were analyzed through infrared (IR), X-ray (XR), ζ potential, cation exchange capacity (CEC), particle size, and SEM images. The composite was subjected to the adsorption of heavy metals (Pb, As, Zn, and Cd) at pH 4.5 and the removal percentage, kinetics, and adsorption isotherms were evaluated. It was observed that the activated nanoclay and the composite that presented a particle size of around 400 ...

The avocado fruit is an agro-industrial product with high export demand in Peru due to its sensory and nutritional qualities, which can be affected during storage. The study aimed to evaluate the effect of the application of a coating formulated with potato starch (Solanum tuberosum ssp andigena), nopalmucilage (Opuntia ficus indica), and pectin on the physicochemical and physiological properties during the storage of Fuerte and Hass avocados. Samples were taken in their harvest state from the plantation in “Occobamba”, which is cultivated by the Avocado Producers Association in Chincheros, Apurímac, Peru. Physicochemical properties (titratable acidity, pH, total soluble solids) and physiological properties (weight loss, firmness, and color L* a* b*) were determined during 20 days of storage at 20 C. The elaborated films present high transparency and low aw values. In the coated avo...