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Amaranthus tricolor (red amaranth) is an important member of the Amaranthus species ubiquitously cultivated worldwide for its valuable constituents. In this study, the determination of important nutrients, minerals, amino acids, phytochemicals, carotenes, antiradical activity, and antibacterial activity of the entire part of the red amaranth plant was performed. The analysis of the nutritional composition of the whole part of red amaranth shows that there was an appreciable quantity of protein (26.60 ± 0.42%), fat (4.49 ± 0.30%), fiber (6.67 ± 0.33%), and carbohydrate (39.80 ± 0.15%). Potassium (1080.02 ± 32.51 mg/100g dry weight) was found as a major trace element among others (Na, Ca, and Iron). Overall seventeen amino acids were identified and the most abundant amino acid in red amaranth was glutamic acid (23.61 ± 0.16 mg/g). However, lysine (14.32 ± 0.20 mg/g) was found to be higher than each of the …