Pumpkin seeds have a higher total phenolic compound content, but phenolic compounds from amaranth grains show stronger antiradical properties.
The researchers extracted phenolic compounds from pumpkin seeds and amaranth grains using an 80% methanol solution. They then characterised these extracts by their total phenolic compound contents, antioxidant capacities, antioxidant power, and their antiradical activity against a given radical. The individual phenolic compounds were identified with a method known as high-performance liquid chromatography with diode-array detection.
They found that pumpkin seeds had a higher total phenolic compound content than amaranth grains. However, phenolic compounds from amaranth grains demonstrated a stronger ability to neutralize the radical they were testing against. They also found several peaks on the chromatograms of two extracts, indicative of different compounds and their concentrations. Vanillic acid derivatives were confirmed in the amaranth grains, while in the pumpkin seeds, they identified three main phenolic compounds based on their ultraviolet diode-array detection spectra.
