| Sumario: | Frequent anthocyanin consumption improves health and prevents diseases due to
its antioxidant activity. Exposure of some plants to high concentrations of heavy metals
may increase anthocyanin concentration and thus improve their food quality. This study
determined the effect of Cu spraying on hibiscus (Hibiscus sabdariffa L.) leaves at various
dosages and number of doses on anthocyanin content, physical and chemical characteristics,
and calyces yield. For this purpose, hibiscus genotype Reina Roja was grown
under rainfed conditions. During the vegetative stage, Cu was sprayed two, four or six
times with 150, 300 and 450 mg L-1. The results indicate that four and six sprayings
with 150, 300 and 450 mg Cu L-1 reduced dry calyces yield. Two sprayings at either
Cu dosage did not modify calyces yield. Added Cu increased significantly anthocyanin
content and titratable acidity and decreased ascorbic acid content in the calyces. Anthocyanin
content increased the most (57 and 44%) when Cu was sprayed six times at 300
and 450 mg L-1. The data suggests that two sprayings with 150 mg Cu L-1 could improve
nutritional quality of hibiscus extracts without affecting dry calyces yield.
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