Some Viburnum species are used for preparation of the traditional drink called gilaburu in Anatolia. In the current study, our goal was to evaluate acetylcholinesterase (AChE) inhibitory and antioxidant activities of the ethyl acetate, methanol, and water extracts prepared from the branches, leaves, and fruits of Viburnum opulus and Viburnum lantana along with salicin, amentoflavone, and chlorogenic acid, three major compounds abundantly found in these species. AChE enzyme inhibition was tested in vitro using an enzyme-linked immunosorbent assay microplate reader at 50, 100, and 200 μL/mL concentrations. Antioxidant activity was examined by ferrous ion chelating capacity, ferric reducing antioxidant power, and β-carotene bleaching assay at 500, 1,000, and 2,000 μg/mL. Total phenol and flavonoid contents of the extracts were also established by Folin-Ciocalteau and AlCl(3) reagents, respectively. Our data revealed that the leaf methanol extract of V. opulus displayed a significantly high inhibitory effect against AChE (57.63 ± 1.23%, 87.41 ± 0.99%, and 93.19 ± 0.87% at 50, 100, and 200 μg/mL, respectively). The extracts of V. lantana exerted higher antioxidant activity.
The present study investigated the analgesic and hepatoprotective activities of a water extract of Ononis spinosa L. (OS) in mice. Analgesic activity was based on the pain thresholds measured with the tail-flick test before administration at 30, 90 and 150 min. The results were analysed with one-way variance analysis. The extract of Ononis spinosa showed analgesic activity equivalent to aspirin at 30 and 90 min and even higher than aspirin with the 50 mg/kg dose. At a dose of 100 mg/kg OS showed an analgesic effect equivalent to aspirin at all time points.The hepatoprotective influence of OS on carbon tetrachloride (CCl(4))-induced acute liver toxicity was also studied. The extract had no significant effect on the increased levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and bilirubin in CCl(4) treated animals (p > 0.05). Thus, the results reveal that the extract of OS had no hepatoprotective effect on CCl(4)-induced acute liver toxicity.
In the present study, antioxidant properties of the water extracts of different parts of Viburnum opulus and Viburnum lantana (Caprifoliaceae) were investigated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging and superoxide anion scavenging methods. The extracts were prepared from the fruits, branches, and leaves of V lantana and V opulus species. The branch extracts of V lantana and V opulus inhibited superoxide anion in a concentration-dependent manner. Compared with t-tocopherol, the fruit extract of V lantana did not show any scavenging effect on superoxide anion formation. V lantana leaf extracts, however, showed a moderate scavenging effect on superoxide anion formation, whereas V lantana branch extracts showed a strong scavenging effect (IC50 = 3.1 mg/ml) on superoxide anion in higher concentration. On the other hand, all extracts exhibited a scavenging effect on the DPPH radical with various potencies. When compared with butylated hydroxytoluene, V opulus branch and V lantana leaf extracts, as well as V lantana branch, V opulus fruit and V lantana fruit extracts, showed strong DPPH radical scavenging activity with IC50 values of 0.014, 0.035, 0.052, 0.057 and 0.085 mg/ml, respectively.
The ethyl acetate, methanol, and water extracts of 16 Ballota species (Family Lamiaceae)-Ballota acetabulosa, Ballota antalyanse, Ballota cristata, Ballota glandulosissima, Ballota inaequidens, Ballota larendana, Ballota latibracteolata, Ballota macrodonta, Ballota nigra ssp. anatolica, B. nigra ssp. foetida, B. nigra ssp. nigra, B. nigra ssp. uncinata, Ballota pseudodictamnus ssp. lycia, Ballota rotundifolia, Ballota saxatilis ssp. brachyodonta, and B. saxatilis subsp. saxatilis-were screened for their 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical quenching, ferric-reducing antioxidant power, and ferrous ion-chelating capacity at 1mg/mL. Hispanolone, a major diterpene found in the Ballota genus, was also tested in the same manner. Total phenol and flavonoid contents of the extracts were determined by Folin-Ciocalteau and AlCl(3) reagents, respectively. The extracts showed insignificant quenching activity against DPPH radical, but they had moderate antioxidant activity (0.597 ± 0.03 to 1.342 ± 0.01) in the ferric-reducing test compared to chlorogenic acid (the reference compound) (3.618 ± 0.01). All of the extracts (ranging from 65.1 ± 0.64% to 96.3 ± 0.09%) and hispanolone (97.31 ± 0.30%) exerted a remarkable ferrous ion-chelating effect. The highest total phenol (gallic acid equivalent) and flavonoid (quercetin equivalent) contents were found in the ethyl acetate extract of B. glandulosissima (393.7 ± 3.03 and 140.6 ± 1.97 mg/g of extract, respectively). Therefore, Ballota species could be a good source of natural preservatives in foodstuffs.
Plants of the family Amaryllidaceae are well known not only for their ornamental value but also for the alkaloids they produce. Some of these alkaloids exhibit interesting pharmacological and/or biological properties. However, the most extensively studied effects are those of non-specific inhibition, such as antiviral and antitumour activities [1]. Sternbergia species, a member of this family, was found to contain lycorine as a major alkaloid. Sternbergia is represented by 6 taxa in Turkey [2].In our previous studies, six alkaloids (lycorine, homolycorine, galanthamine, haemanthamine, haemanthidine, and tazettine) were isolated, chemically characterized, and analyzed by HPLC in different species of Sternbergia [3][4][5]. The analgesic, antiinflammatory, antimicrobial, and antioxidant activities of some Sternbergia species and lycorine were also investigated by us [3,[5][6][7].This paper is a part of our ongoing studies [3-7] on this genus in which we attempt to quantify of lycorine from five species of the genus Sternbergia.On reviewing the literature regarding the analysis of lycorine, we found a lack of HPLC systems for studying lycorine. Furthermore, an HPLC procedure for the separation and quantification of lycorine from the acidic extract of Sternbergia lutea has also been reported by Evidente et al. [8].Good separation and determination of Sternbergia lutea ssp. lutea in bulbs was performed by using the mobile phase consisting of ammonium carbonate and acetonitrile (85:15 v/v) and a Supelcosil LC-18 column (250×4.6 mm i.d., 5 μm Supelco, Belleforte, PA, USA) at a flow rate of 1 mL/min and column temperature 24°C. Chromatograms were plotted by a Diod-Array Detector (DAD) at the wavelength 292 nm.Limits of detection (LOD) were established at a signal-to-noise ratio (S/N) of 3. Limits of quantification (LOQ) were experimentally verified by six injections of lycorine at the LOD and LOQ concentrations. The LOD was calculated to be 2.5 μg/mL and the LOQ was calculated to be 7.5 μg/mL for lycorine (Table 1).The precision of the method (intra-day variations of replicate determinations) was checked by injecting lycorine nine times at the LOQ level. The precision of the method, expressed as the RSD % at the level, was 0.646 % for lycorine (Table 2).Quantitative determination of lycorine in the bulbs of Sternbergia species was carried out by RP-HPLC using the external standard method.The assay results of Sternbergia species are shown in Table 3. Standard solutions of lycorine were added to the plant extracts and injected at each time. The area of peaks corresponding to the standards were increased to prove the presence of these compounds. Their percent mean and standard deviation values are summarized in the same Table 3.
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