Effect of Different Extraction Methods on Anthocyanin Content in Hibiscus sabdariffa L. and their Antiplatelet and Vasorelaxant Properties

• Published in: Plant foods for human nutrition (Dordrecht) 2023-06, Vol.78 (2), p.342-350
• Main Authors: Martins, Denise Rubinho dos Santos, Lescano, Caroline Honaiser, Justo, Alberto Fernando Oliveira, Vicente, Julia Modesto, Santos, Sérgio Henrique Sousa, Aguilar, Charles Martins, Borges, Alexandre, Pires de Oliveira, Ivan, Sanjinez-Argandoña, Eliana Janet
• Format: Article
• Language: English
• Subjects: Acidification; Animals; Anthocyanins; Anthocyanins - pharmacology; Antioxidants; Antioxidants - pharmacology; Aorta; Arachidonic acid; Beverages; Calcium; Calcium ions; Calcium mobilization; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Cyclic GMP; Cyclic GMP - metabolism; Ecology; Endothelium; Food Science; Guanylate cyclase; Hibiscus; Hibiscus sabdariffa; Mice; Nitric oxide; Nitric-oxide synthase; Nucleotides; Nutrition; Oxidation; Oxidizing agents; Phosphorylation; Plant Extracts - pharmacology; Plant Physiology; Platelet aggregation; Platelets; Potassium channels (calcium-gated); Roselle; Vasodilation; Vasodilator Agents - pharmacology; Vasodilator-stimulated phosphoprotein; Vitamin E
• ISSN: 0921-9668; 1573-9104
• DOI: 10.1007/s11130-023-01067-5

Hibiscus sabdariffa L. is a worldwide component for tea and beverages, being a natural source of anthocyanins, which are associated with cardiovascular activities. To investigate this relationship, we explored different methods of aqueous extraction on the anthocyanin content and antioxidant activity of H. sabdariffa L. calyx extract (HSCE) . Pharmacological effects via platelet aggregation, calcium mobilization, cyclic nucleotide levels, vasodilator-stimulated phosphoprotein Ser157 and Ser239, and on the vasomotor response of aortic rings isolated from mice are studied herewith. We found that the application of ultrasonic turbolization, 20 min, combined with acidified water was significantly more effective in the extraction process, providing extracts with the highest levels of anthocyanins (8.73 and 9.63 mg/100 g) and higher antioxidant activity (6.66 and 6.78 μM trolox/g of sample). HSCE significantly inhibited (100–1000 μg/mL) arachidonic acid-induced platelet aggregation, reduced calcium mobilization, and increased cAMP and cGMP levels with VASPSer157 and VASPSer239 phosphorylation. Vasorelaxation reduction was confirmed by the aortic rings and endothelium assays treated with nitric oxide synthase inhibitors, soluble guanylyl cyclase (sGC) oxidizing agent, or Ca 2+ -activated K + channel inhibitor. The increasing of cGMP levels could be understood considering the sGC stimulation by HSCE compounds in the specific stimulus domain, which allows an understanding of the observed antiplatelet and vasorelaxant properties of H. sabdariffa L. calyx extract.