Comparison of Traditional and Modern Techniques for Betalains Extraction from Amaranth Agro-Industrial Waste: The Recovery of High Value By-Products

Abraham Heriberto Garcia-Campoy1, Antonio De León-Rodríguez1, Eduardo Espitia-Rangel2, Ana Paulina Barba-de la Rosa1
1IPICYT, Instituto Potosino de Investigación Científica y Tecnológica A.C., San Luis Potosí, Mexico
2INIFAP-CEVAMEX, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Texcoco, Mexico

Tóm tắt

The increasing demand for healthier food has boosted the amaranth cultivation for the production of edible grains. However, after the grain is harvested, the leaves are considered agro-industrial waste and are left on the soil, but those leaves have a high potential for the recovery of high value by-products such as betalains. Betalains are natural dyes with important uses in food and pharmaceutical industries, which are extracted from plants by Maceration (MAC) or by using new techniques such as microwave-assisted (MWE) and sonication-assisted (SAE) extraction. The aim of this study was to compare the extraction efficiencies of these three methods to recover bioactives from amaranth leaves waste. Betalains (betacyanins and betaxanthins), phenolics, flavonoids, and antioxidant activity were quantified by colorimetric methods. The metabolite profile of the extracts was analysed by UPLC–MS/MS. Results showed that highest betalains content (225 ± 20 mg/100 g) were obtained with SAE method, but higher phenolic compounds and antioxidant activity were obtained with MAC when using 20% aqueous-methanol as solvent. Extracts analysis showed the presence of 13 betalains and 21 phenolic compounds, including asebotin and shikalkin. Results have shown that amaranth leaves agro-industrial waste are a rich source of bioactive compounds. This work will contribute to the waste recovery effort and the implementation circular bioeconomy in the amaranth grain cultivation.

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