Alkaloids and Phenolic Compounds from Sida rhombifolia L. (Malvaceae) and Vasorelaxant Activity of Two Indoquinoline Alkaloids

• Main Authors: Otemberg Souza Chaves, Yanna Carolina Ferreira Teles, Matheus Morais de Oliveira Monteiro, Leônidas das Graças Mendes Junior, Maria de Fátima Agra, Valdir de Andrade Braga, Tânia Maria Sarmento Silva, Maria de Fátima Vanderlei de Souza
• Format: Article
• Language: English
• Published: MDPI AG 2017-01-01
• Series: Molecules
• Subjects: Sida rhombifolia; Malvaceae; indoquinoline alkaloids; vasorelaxant activity
• Online Access: http://www.mdpi.com/1420-3049/22/1/94

The follow-up of phytochemical and pharmacological studies of Sida rhombifolia L. (Malvaceae) aims to strengthen the chemosystematics and pharmacology of Sida genera and support the ethnopharmacological use of this species as hypotensive herb. The present work reports phytoconstituents isolated and identified from aerial parts of S. rhombifolia by using chromatographic and spectroscopic methods. The study led to the isolation of scopoletin (1), scoporone (2), ethoxy-ferulate (3), kaempferol (4), kaempferol-3-O-β-d-glycosyl-6′′-α-d-rhamnose (5), quindolinone (6), 11-methoxy-quindoline (7), quindoline (8), and the cryptolepine salt (9). The alkaloids quindolinone (6) and cryptolepine salt (9) showed vasorelaxant activity in rodent isolated mesenteric arteries.