The aim of this study was to evaluate the influence of Inca muña phenolic antioxidants in the reduction of acrylamide (AA) in potato chips. The potatoes were cut into 2 mm thick slices, the addition of antioxidants was evaluated by immersion at atmospheric pressure and by vacuum impregnation (VI) at 80 kPa for 10 min. In both cases, two antioxidant concentrations were used (1 and 2 mg Gallic acid equivalents (GAE) mL-1) and times of 15, 30, 60 and 120 s. The greatest reduction of AA was obtained by VI with 1 mg GAE mL-1 for 120 s (67.4%) and 2 mg GAE mL-1 for 15 s (59.3%); while immersion at atmospheric pressure with 2 mg GAE mL-1 for 30 s and 60 s resulted in reductions of 50.8 and 50.9%, respectively. Besides, the addition of phenolics from Inca muña had no influence on the colour of potato chips. VI treatment resulted in increased amounts of phenolic compounds and antioxidant capacity in the potato chips being the most abundant phenolic compounds hesperidin and luteolin glucoside; while in the control samples phenolic corresponded to chlorogenic acid isomers.

Abstract Inadequate storage conditions can affect the sensory, physicochemical, and functional properties of tropical fruits such as Pouteria lucuma; which is a climacteric fruit, with a pleasant aroma and flavor; Peru being the main producer and exporter of this fruit, postharvest storage conditions have not been studied to maintain its properties. The objective of the research was to evaluate the effect of the storage conditions on the main physicochemical components, primary and secondary metabolites, antioxidant, and hypoglycemic capacity during postharvest ripening, under two storage conditions: ambient (29 °C and 70% RH) and climatic chamber (15 °C and 90% RH). Regarding the physicochemical characteristics, the state of maturity influenced acidity, pH, reducing sugars, starch, dietary fiber, firmness, pulp color and epicarp. In climate-controlled storage, glucose is the only metabolite that increases; while fructose, alcohol sugars and amino acids (Ala and Val), present higher values under ambient conditions; sucrose, organic acids, amino acids (Tyr, Glu, Asp and Thr), β-carotene, total phenolic compounds and total carotenoids were not affected by the type of storage. The measure of antioxidant and hypoglycemic capacity decreased significantly (p < 0,05), showing to be affected only by the state of maturity. The study of the carotenoid profile according to its spectrum (UV-vis) showed the presence of the group of xanthophylls. The results indicate that the state of maturity concerning the storage condition influenced most of the changes studied.

Resumen Condiciones inadecuadas de almacenamiento pueden afectar las características sensoriales, fisicoquímicos y propiedades funcionales en frutos tropicales como Pouteria lúcuma; que es una fruta climatérica, de aroma y sabor agradable; siendo el Perú el principal productor y exportador de esta fruta, no se han estudiado condiciones de almacenamiento postcosecha que permitan mantener sus propiedades. El objetivo de la investigación fue evaluar el efecto de las condiciones de almacenamiento sobre los principales componentes fisicoquímicos, metabolitos primarios y secundarios, capacidad antioxidante e hipoglucemiante durante la maduración postcosecha, en dos condiciones de almacenamiento: ambiente (29 °C y 70% HR) y cámara climatizada (15 °C y 90% HR). Con relación a las características fisicoquímicas, el estado de madurez influyó en la acidez, pH, azúcares reductores, almidón, fibra dietaría, firmeza, color de pulpa y epicarpio. En almacenamiento en cámara climatizada, la glucosa es el único metabolito que se incrementó; mientras que la fructosa, los azúcares alcohol y los aminoácidos (Ala y Val), presentan valores superiores en condiciones ambientales; la sacarosa, ácidos orgánicos, aminoácidos (Tyr, Glu, Asp y Thr), β-caroteno, compuestos fenólicos totales y carotenoides totales no fueron afectadas por el tipo de almacenamiento. La medida de la capacidad antioxidante e hipoglucemiante disminuyeron significativamente (p < 0,05), mostrando ser afectadas solo por el estado de madurez. El estudio del perfil de carotenoides en función de su espectro (UV-vis) mostró presencia del grupo de las xantofilas. Los resultados indicarían que el estado de madurez respecto a la condición de almacenamiento tuvo efecto sobre la mayoría de los cambios estudiados.