Characterisation of nutrient profile of quinoa (Chenopodium quinoa), amaranth (Amaranthus caudatus), and purple corn (Zea mays L.) consumed in the North of Argentina: Proximates, minerals and trace elements

•Characterisation of pseudocereals allows their selection based on accurate measurements.•Andean cereals are better sources of iron, copper, manganese and zinc, than rice.•Quinoa, amaranthus, and purple corn showed higher protein content than rice.