The Bignoniaceae family is characterized by the presence of secondary metabolites. Genera
such as Arrabidaea are known for their chemical and biological composition, with emphasis on
the species Arrabidaea chica (crajirú). The present study aimed to perform a phytochemical
study and evaluate the antioxidant and allelopathic activity of the aqueous extract of A. chica
leaves. The material was collected in Itacoatiara-AM and dried to obtain aqueous extract (EA Ac). A phytochemical test was performed to identify flavonoids, tannins, saponins, terpenes
and alkaloids, followed by UV-VIS spectrophotometry. The antioxidant activity was evaluated
by the DPPH•, ABTS•+ and FRAP methods, and total phenolics. Allelopathic tests verified the
impact of EA-Ac (1% and 0.1%) on the germination and growth of lettuce seeds. The
prospecting identified flavonoids, tannins, terpenes and alkaloids, confirmed by
spectrophotometry. Against DPPH• and ABTS•+ radicals, it presented antioxidant activity of
936.66 ± 0.028 and 1106.66 ± 0.005 µM ET, reducing power of 1636.49 ± 0.02 µM Fe2+/g and
total phenolics 188.20 ± 0.038 mg EAG g-1. The extract positively influenced lettuce
germination, with 1% accelerating germination, while 0.1% promoted greater root growth. This
study highlights the functional and biological value of A. chica, evidencing its potential for
applications in health and agriculture
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