Harinas de lupino blanco (Lupinus albus) y andino (L. mutabilis) aptas para consumo: características físico-químicas y funcionales / White lupine (Lupinus albus) and Andean lupine (L. mutabilis) flours suitable for consumption: physico-chemical and functional characteristics

Resumen Introducción: los lupinos son legumbres fuente de nutrientes y fitoquímicos con propiedades beneficiosas para la salud. Sin embargo, presentan alcaloides que deben ser eliminados previos al consumo. El objetivo del estudio fue obtener y caracterizar harinas de lupino blanco y andino, aptas para el consumo. Materiales y método: los granos se desamargaron por método acuoso tradicional que incluyó remojo por 18 horas, cocción por 1 hora y lavado por 5 días. Luego, se secaron en estufa, se molieron y tamizaron. Se determinó alcaloides, proteínas, grasas, fibra dietaria total, sodio, fósforo, color, índice de absorción y solubilidad en agua, polifenoles totales, flavonoides, carotenoides y perfil de fenoles en semillas crudas y harinas tratadas. Resultados: el contenido de alcaloides en las harinas tratadas se encontró entre los límites establecidos para la ingesta segura (<0,07 g/100g). Las proteínas se encontraron entre 25-39 g/100g, grasas entre 12-23 g/100g, fibra dietaria total 35-50 g/100g y cenizas 1,5-3,3 g/100g. El calcio se encontró entre 210-323 mg/100g, fósforo 140-202 mg/100g y sodio 38-44 mg/100g. El color correspondió al amarillo con tendencia al rojo. La harina de lupino andino tratada presentó mayor índice de absorción de agua (7,8 g/g) y solubilidad en agua (78,8%). Los productos tratados presentaron polifenoles (13,4 y 20,8 mg/100g), flavonoides (27,5 y 8,7 mg/100g) y carotenoides (0,3 y 0,9 mg/100g). El perfil de fenoles correspondió a 3 flavonas y 3 isoflavonas en lupino blanco. En el lupino andino, se detectaron 5 flavonas y 3 isoflavonas. Conclusiones. Las harinas tratadas presentan características físico-químicas y funcionales que podrían representar ingredientes alternativos a las tradicionales como trigo y soja, para la formulación de alimentos saludables.

Abstract Introduction: lupins are legumes that are a source of nutrients and phytochemicals with beneficial properties for health. However, they present alkaloids that must be eliminated prior to consumption. The objective of the work was to obtain and characterize White and Andean lupine flours suitable for consumption. Materials and method: the grains were debittered using traditional aqueous method that included soaking for 18 hours, cooking for 1 hour and washing for 5 days. Then, they were dried in an oven, ground and sieved. Alkaloids, proteins, fats, total dietary fiber, sodium, phosphorus, color, absorption rate and water solubility, total polyphenols, flavonoids, carotenoids and phenol profile in raw seeds and treated flours were determined. Results: the alkaloid contents of treated flours were within the limits established for safe intake (less than 0.07 g/100g). Proteins were found between 25-39 g/100g, fats between 12-23 g/100g, total dietary fiber 35-50 g/100g and ash 1.5-3.3 g/100g. Calcium was found between 210-323 mg/100g, phosphorus 140-202 mg/100g and sodium 38-44 mg/100g. The color corresponded to yellow with a tendency to red. The treated Andean lupine flour presented a higher rate of water absorption (7.8 g/g) and solubility in water (78.8%). The treated products presented polyphenols (13.4 and 20.8 mg/100g), flavonoids (27.5 and 8.7 mg/100g) and carotenoids (0.3 and 0.9 mg/100g). The phenolic profile corresponded to 3 flavones and 3 isoflavones in white lupine. In Andean lupine, 5 flavones and 3 isoflavones were detected. Conclusion: the treated flours could represent alternative ingredients to the traditional ones such as wheat and soy for the formulation of healthy foods.

Chemical and functional characterization of seed, pulp and skin powder from chilto (Solanum betaceum), an Argentine native fruit. Phenolic fractions affect key enzymes involved in metabolic syndrome and oxidative stress.

The aim of this work was to assess the nutritional and functional components of powder obtained by lyophilization of whole fruits, seeds, pulp and skin from chilto (Solanum betaceum Cav) cultivated in the ecoregion of Yungas, Argentina. The powders have low carbohydrate and sodium content and are a source of vitamin C, carotenoid, phenolics, potassium and fiber. The HPLC-ESI-MS/MS analysis of the fractions enriched in phenolics allowed the identification of 12 caffeic acid derivatives and related phenolics, 10 rosmarinic acid derivatives and 7 flavonoids. The polyphenols enriched extracts before and after simulated gastroduodenal digestion inhibited enzymes associated with metabolic syndrome, including α-glucosidase, amylase and lipase and exhibited antioxidant activity by different mechanisms. None of the analyzed fruit powders showed acute toxicity or genotoxicity. The powders from the three parts of S. betaceum fruit may be a potential functional food and the polyphenol enriched extract of seed and skin may have nutraceutical properties.

Micrografía analítica de raíces de Lepidium meyenii (Brassicaceae) / Analytical micrography of root from Lepidium meyenii (Brassicaceae)

“Maca” (Lepidium meyenii Walpers - Brassicaceae-) is used like nutritional and/or medicinal. Its root is consumed as flour and is used in the bread industry. The aim of this work is to determine micrographic characters for botanical quality control of foods derived from vegetables. The roots were analyzed by means of disgregation with Sodium Hydroxide to 5 percent; reduction to dust; histochemistries reactions; observation with polarized light of starch grains and measurement of the observed elements. Small and polymorphic starch grains and elements of conduction were observed. These micrographic characters are useful for the quality control of commercial samples of “maca” that appear like flours.

La “maca” (Lepidium meyenii Walpers –Brassicaceae-) se emplea como alimenticia y/o medicinal. Su raíz se consume como harina y se utiliza en la industria panificadora. El objetivo de este trabajo es determinar caracteres micrográficos para control de calidad botánico de alimentos derivados de vegetales. Se analizaron las raíces mediante disociado leve con Hidróxido de Sodio al 5 por ciento; reducción a polvo; reacciones histoquímicas; observación con luz polarizada de los granos de almidón y medición de los elementos observados. Se observaron gránulos de almidón pequeños y polimórficos y elementos de conducción. Estos caracteres micrográficos son útiles para el control de calidad de muestras comerciales de “maca” que se presentan en forma de harinas.