Grape seed oil, which is extracted with highly toxic organic solvents that are harmful to human health, is produced from tons of grape pomace waste, generated during winemaking. Sometimes, this waste is used to make compost or is burnt, which causes environmental contamination. The functional qualities, antioxidant capacity (AC), α-tocopherol and total phenolic compounds content (TPC) of Black Borgoña (Vitis labrusca) grape seed oil, extracted by supercritical CO2, were evaluated. The high content of linoleic acid (w-6) and monounsaturated fatty acids contributed to the beneficial effect on ​​the functional quality indices, which were 0.20, 0.23, 11.80 for IA, IT and H:H, respectively. In addition, a POV of 6.23 ± 0.08 milliequivalents of peroxide/kg oil and an anisidine index of 2.70 ± 0.05 indicated a good quality oil. Also, a high concentration of α-tocopherol (9.82 ± 0.02 mg/100 g oil) and a high TPC (114.14 ± 3.24 mg GAE/kg oil) were obtained. This study demonstrated that supercritical CO2 extraction is a suitable method for the delivery of a high-quality grape seed oil.

Después de la cosecha del fruto chirimoya, los árboles liberan enormes cantidades de hojas, las cuales son quemadas por los agricultores. Este trabajo muestra que las hojas pueden ser usadas para nuestro beneficio como antioxidante. Se determinaron los compuestos fenólicos (CF) y la actividad antioxidante (AA) de los extractos de la hoja seca de Annona cherimola Mill en etanol al 70% v/v, agua a 80 °C, y agua subcrítica (AS) a 110, 120 y 130 °C, siguiendo un diseño factorial con el programa Minitab. Los CF se cuantificaron con la metodología de Folin Ciocalteu y la AA con el 2,2-difenil-1-picrilhidrazilo (DPPH) y con el poder antioxidante reductor del hierro (FRAP). Los resultados indicaron que el tipo de solvente y el tiempo de extracción presentaron un efecto significativo en el contenido de CF y AA de los extractos. Se concluyó que el extracto de hoja de chirimoya es un potencial antioxidante. El extracto de AS a 130 °C presentó el mayor contenido de CF (5,6 g EAG/100 g de hoja seca) y el extracto etanólico presentó mayor AA (0,86 mg equivalente trolox/mg extracto seco; IC50=0,020 mg de extracto seco/mL de extracto de hoja seca y FRAP de 1710,14 μmol equivalente trolox /g de hoja seca) y los extractos obtenidos con AS a menor temperatura presentaron mayores valores de AA.

This report presents a novel protocol for the recovery and utilization of recycled manganese oxide from used batteries through hydrothermal (HT) treatment. The recovered and treated material showed high activity towards rutin electro-oxidation (RT) on a screen-printed carbon electrode (SPCE) modified with recovered and treated MnO₂ within a hydrothermal reactor. Material characterization using scanning electron microscopy (SEM) and density distribution and particle size analysis revealed a more homogeneous and less dispersed particle size compared to the untreated material. This treatment increased the electroactive activity of the anodic current for RT by more than 70% compared to the SPCE without MnO₂ treated with HT. The electroanalytical application of this new electrode enabled the detection of RT, with a detection limit of 0.03 µmol/L, and its application in natural samples such as coffee and flavored beverages.