Özet:

Lophanthus turcicus (LT) belongs to the Lamiaceae family and is an endemic plant that grows in the Eastern Anadolu region in our country. In this study, it is intended to determine the antioxidant properties of the methanol extract obtained from the plant flower, the vitamin C content, the trace element and mineral compounds. The trace element and mineral concentrations were made with inductive combined plasma-optical emission spectrometry (ICP-OES) and atomic absorption spectroscopy (AAS). The element values are identified as Mg > Ca > K > Na > Zn > Mn > Fe > P > Ti > Sr > Cu > Cr > Pb > Co > Mo > As > Cd > Be > Sn. The total antioxidant activity in the methanol extract in the LT plant flower, the content of phenol, flavonoids and vitamins C is 26.42 ± 1.68 (mM ascorbic acid g-1), 13.44 ± 0.68 (mg gallic acid g-1) and 4.31 ± 0. 36 (mg quercetin g-1) was detected in the form of 113.73 ± 11.81 mg 100g-1. The study found DPPH IC50 122.30 ± 7.68 ug mL-1, while for BHT with positive control 87.98 ± 6.39 ug mL-1 and for ABTS cation radicals IC50 46.97 ± 2.03 ug mL-1, and for trolox with positive control 18.47 ± 2.53 ug mL-1. It was found that the flower’s damping activity of the DPPH and ABTS radicals was low by positive control but had a good damping activity compared to other plant species. It is believed that the high content of vitamin C, the presence of some important elements and the high and strong antioxidant capacity in terms of total phenolic, flavonoid and antioxidant activity will be a reference for future studies.

Anahtar Kelimeler:

Özet:

Lophanthus turcicus (LT) belonging to Lamiaceae family is an endemic plant species grown in Eastern Anatolia Region of Turkey. In this study, To determine the antioxidant properties of methanol extract obtained from LT plant flower, vitamin C content, trace element and mineral compositions. Trace element and mineral concentrations were measured by inductively coupled plasma-optical emission spectrometry (ICP-OES) and atomic absorption spectroscopy (AAS). Element values was determined as Mg > Ca > K > Na > Zn > Mn > Fe > P > Ti > Sr > Cu > Cr > Pb > Co > Mo > As > Cd > Be > Sn respectively. Total antioxidant activity, phenol, flavonoid and vitamin C content in methanol extract of LT plant flowers were 26.42 ± 1.68 (mM ascorbic acid g-1), 13.44 ± 0.68 (mg gallic acid g-1) and 4.31 ± 0.36 (mg quercetin g-1), 113.73 ± 11.81 mg 100g-1 respectively. In the study, DPPH IC50 was 122.30 ± 7.68 μg mL-1 and 87.98 ± 6.39 μg mL-1 for the positive control BHT and ABTS cation radical IC50 was found as 46.97 ± 2.03 ug mL-1, and positive control trolox was found as 18.47 ± 2.53 ug mL-1. Although DPPH and ABTS radical scavenging activity of the plant flower was lower than the positive control, it was determined that it had a good scavenging activity compared to other plant species. It is thought that high vitamin C content, presence of some important trace elements and superior and strong antioxidant capacity in terms of total phenolic, flavonoid and antioxidant activity will constitute a reference for future studies.