Abstract
Scopoletin is a phytochemical of coumarins distributed in some plants. The aim of this study was the evaluation of scopoletin content and antioxidant activity of nettle, mallow, purslane, knot-grass, dill and coriander encountered in Black Sea regions. Analyses were conducted on the leaves and stems of these plants, except knot-grass. The lowest scopoletin content was found in nettle leaves (11.48 mg/kg) and the highest amount was found in knot-grass (6708.37 mg/kg). Scopoletin was not detected in stems of mallow, purslane and dill plants. The lowest total phenolic content was found in mallow stem (0.86 mg GAE/g) and the highest value was in knot-grass (67.74 mg GAE/g). The lowest ferric reducing antioxidant power (FRAP) was ascertained in purslane stem (1571.58 µmol Fe2+/g) and the highest value in coriander leaves (64905.90 µmol Fe2+/g). The mallow stem displayed the lowest DPPH radical scavenging activity of 48.63 µmol TE/g, while knot-grass provided the highest DPPH radical scavenging activity of 5261.56 µmol TE/g. These results revealed that knot-grass was the richest source of scopoletin and antioxidants. The studied plants exhibited a high interest in food, cosmetic and pharmaceutical industries.
Highlights
More than ten thousand phytochemicals have been figured out in food products
The results have shown diversity in scopoletin content and antioxidant activity depending on the type and parts of plants
It was remarked that the scopoletin content of some samples in nettle leafy was below the detection limits
Summary
More than ten thousand phytochemicals have been figured out in food products. The use, importance and efficacy of these phytochemicals have been largely studied. Coumarins have been largely reported in plants, their functions have not been completely defined. They are considered as a fungicide and bactericide as well as plant growth regulator [1]. Scopoletin and its β-D-glycoside form, scopolin, belong to coumarins. They are distinguished from other coumarins by their physicochemical properties and healing applications [2]. Fruits and vegetables from different kinds of families including Geraniaceae, Liliaceae, Musaceae, Compositae, Convolvulaceae, Loasaceae, Urticaceae, Apiaceae, Fabaceae, Malvaceae and Solanaceae have been reported to contain numerous phytochemicals, no study has investigated the scopoletin contents of nettle (Urtica diocia L.), mallow (Malva sylvestris L.), purslane (Portulaca oleracea L.), knot-grass (Polygonum cognatum Meissn), dill (Anethum graveolens L.) and coriander (Coriandrum sativum L.) grown in Turkey.
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