Abstract

RAMIREZ-ARAGON, M.G. et al. Rosmarinic acid, total phenolics and antioxidant capacity in three varieties of Ocimum basilicum L. With different potassium doses. Polibotánica [online]. 2019, n.47, pp.89-98. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.47.7.

The objective of this study was to determine the content of rosmarinic acid (RA), total phenolic compounds (TPC) and antioxidant capacity in Trolox (ACET) in three varieties of basil (Ocimum basilicum L.) employing different doses of potassium in nutrient solution (7, 9, 11 and 13 mmol L-1). It was used a 3 x 4 factorial random block design, where the factors were genotype and concentration of potassium. All the variables analyzed presented a significant difference (p ≤ 0.01). The AR content presented a range of 0.4 to 6.4 mg AR g-1. Values of 1.8 to 15.6 mg AGE g-1 were obtained for TPC content. The results obtained from ACET were 39 to 79.9 mg g-1 and these values were increased in relation to rosmarinic acid content and total phenolic compounds. The variety with the highest content of rosmarinic acid, total phenolics and antioxidant capacity was Red Rubin at 13 mmol L-1. The management of K doses in different varieties of basil supports the synthesis of secondary metabolites that are important for different areas of science, on this wise the increase of basil production and its nutraceutical quality would be an alternative to open new markets focused on food and medical industry.

Keywords : basil; secondary metabolites; treatments; varieties.

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