Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Ciencia de Alimentos

The oregano essential oil (Origanum vulgare spp.) cultivated in the city of Tacna, Peru, has been chemically analyzed. The physicochemical analysis determined the following characteristics: color (L * 60,51, a * –2,83, b * 14,31), refractive index: 1,475; specific density: 0,9132 and solubility in alcohol: 75 ml. Also, the chemical composition was evaluated by gas chromatography coupled to mass spectrometry. The chromatogram showed the following percentages: l-4 terpineol with 26,56; thymol with 18,80; g-terpinene, 11,77; 2-carene, 6,53; Terpineol, 4,08; M-cymene, 3,27 and carvacrol 2,24, among others present in smaller proportion.

The oregano essential oil (Origanum vulgare spp.) cultivated in the city of Tacna, Peru, has been chemically analyzed. The physicochemical analysis determined the following characteristics: color (L * 60,51, a * –2,83, b * 14,31), refractive index: 1,475; specific density: 0,9132 and solubility in alcohol: 75 ml. Also, the chemical composition was evaluated by gas chromatography coupled to mass spectrometry. The chromatogram showed the following percentages: l-4 terpineol with 26,56; thymol with 18,80; g-terpinene, 11,77; 2-carene, 6,53; Terpineol, 4,08; M-cymene, 3,27 and carvacrol 2,24, among others present in smaller proportion.

The açaí fruit (Euterpe oleracea) is renowned for its high content of bioactive compounds, particularly anthocyanins, but its low stability against pH, temperature, and light poses challenges for processing and preservation. This study evaluated the antioxidant capacity of anthocyanins extracted and microencapsulated by spray drying, using a combination of maltodextrin and gum arabic as encapsulating agents. During extraction, four treatments were analyzed by combining two pH levels (2 and 4) and two temperatures (45 °C and 65 °C). Treatment T1 (pH 2, 45 °C) showed the highest DPPH radical inhibition percentage (39.86%), while T4 (pH 4, 65 °C) showed the lowest (9.19%). The results indicate that less aggressive conditions favor the preservation of antioxidant activity. Furthermore, it was observed that the properties of the encapsulating agents significantly affect the ther...