Content and Yield of L-DOPA and Bioactive Compounds of Broad Bean Plants: Antioxidant and Anti-Inflammatory Activity...

The broad bean plant contains L-DOPA, a compound that is essential for patients with Parkinson's disease. However, little has been reported on other broad bean compounds that have beneficial effects on health. The objective was to evaluate plants of four Mexican broad bean varieties to determine the content and yield of total phenolic compounds (TPC), total flavonoids (TF), and L-DOPA, as well as to analyze the flavonoid profile and antioxidant (AA) and anti-inflammatory (AANTI) activity in vitro. Broad bean seeds were sown in the field and plants were harvested 20 days after emergence. The analyses were performed with visible UV spectrophotometry and HPLC. The variety José María produced the highest yield of TPC (9.30 g m^-2), TF (8.08 g m^-2), and L-DOPA (5.64 g m^-2) per unit of area. The highest yields per plant were obtained with the Rojita variety: TPC (0.25 g plant^-1), TF (0.21 g plant^-1), and L-DOPA (0.17 g plant^-1). This variety also had the highest antioxidant (IC₅₀ = 87.68 µg mL^-1) and anti-inflammatory (IC₅₀ = 74.40 mg mL^-1) activity, which was attributed to the L-DOPA compounds and to rutin and isoorientins, respectively. The flavonoid profile revealed the presence of rutin and isoorientins, which had not been previously detected in the broad bean plant.