Prospective neurobiological effects of the aerial and root extracts and some pure compounds of randomly selected Scorzonera species.

CONTEXT: Scorzonera L. species (Asteraceae) are edible and as medicinal plants are used for various purposed in folk medicine. OBJECTIVE: The methanol extracts of the aerial parts and roots from 27 Scorzonera taxa were investigated for their possible neurobiological effects. MATERIALS AND METHODS: Inhibitory potential of the Scorzonera species was tested against acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and tyrosinase (TYRO) at 100 µg mL(-1) using ELISA microtiter assay. Antioxidant activity of the extracts was tested with radical scavenging activity, metal-chelation capacity, ferric- (FRAP), and phosphomolibdenum-reducing antioxidant power (PRAP) assays. Chlorogenic acid, hyperoside, rutin, and scorzotomentosin-4-O-ß-glucoside were also screened in the same manner. Total phenol and flavonoid quantification in the extracts were determined spectrophotometrically. RESULTS: The aerial parts of Scorzonera pisidica (40.25 ± 0.74%) and chlorogenic acid (46.97 ± 0.82%) displayed the highest TYRO inhibition, while the remaining samples showed only trivial inhibition against cholinesterases (2.08 ± 1.35%-25.32 ± 1.37%). The same extract of S. pisidica was revealed to be the most potent in scavenging of all three radicals and FRAP assay. DISCUSSION AND CONCLUSION: Out of 27 taxa, S. pisidica, in particular, may deserve further investigation for its neuroprotective potential.

Enzyme inhibitory and antioxidant activities of Viburnum tinus L. relevant to its neuroprotective potential.

In vitro neuroprotective activity of the extracts of Viburnum tinus L. was investigated via inhibition of acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), and tyrosinase (TYRO) by microtitre plate assays. Their antioxidant activity was tested using 2,2-diphenyl-1-picrylhydrazyl (DPPH), N,N-dimethyl-p-phenylendiamine (DMPD), super oxide (SO), and nitric oxide (NO) radical-scavenging activities, ferric ion-chelation capacity, ferric- (FRAP), and phosphomolybdenum-reducing antioxidant power (PRAP) assays. Total phenol and flavonoid content of the extracts was determined spectrophotometrically. The branch-ethyl acetate and fruit-methanol extracts exerted potent anticholinesterase effects (66.4 ± 0.65% to 97.7 ± 0.47%), while the fruit-methanol extract had the highest TYRO inhibition (47.0 ± 0.68%). The methanol extracts showed higher activities in most of the antioxidant tests. All the extracts displayed notable NO-scavenging effects (47.5 ± 5.03% to 74.5 ± 1.80%). Only the fruit-ethyl acetate extract quenched SO radical (38.4 ± 1.01%) at 500 µg ml(-1). Our data indicate that the fruit and branch extracts of V. tinus may provide potential neuroprotection.

In vivo and in vitro evaluation of the therapeutic potential of some Turkish Scorzonera species as wound healing agent.

Wound healing and anti-inflammatory effects of aerial parts and roots of S. acuminata, S. cana var. alpina, S. cana var. jacquiniana, S. cana var. radicosa, S. eriophora, S. laciniata ssp. laciniata, S. suberosa ssp. suberosa and S. sublanata were investigated in current study to clarify the traditional usage of Scorzonera species growing in Turkey. It is well known that some species of the Scorzonera genus are used for wound healing in Turkish and European traditional medicine. Therefore, wound healing effect of the plants was assessed by using linear incision and circular excision experimental wound models and subsequently histopathological analysis. Hydroxyproline content of the treated tissues was also assessed. Furthermore, the extracts were screened for anti-hyaluronidase activity. For the evaluation of anti-inflammatory activity, acetic acid-induced increase in capillary permeability test was used. 20% aqueous methanol extracts of the aerial parts of Scorzonera species, S. cana var. jacquiniana and S. eriophora were found to be effective on the wound and anti-inflammatory activity test models. The results of histopathological examination supported the outcome of linear incision and circular excision wound models. Phytochemical analyses of the tested extracts were also performed by using developed and validated HPLC method. Among the tested standard compounds, varying amounts of the chlorogenic acid, rutin, hyperoside and luteolin-7-glycoside were determined in Scorzonera species.

Enhancement of wound healing by topical application of Scorzonera species: determination of the constituents by HPLC with new validated reverse phase method.

ETHNOPHARMACOLOGICAL RELEVANCE: Scorzonera species are mainly used against arteriosclerosis, kidney diseases, hypertension, diabetes mellitus and rheumatism, as well as for pain relief and wound healing in Turkish folk medicine. In the current study, aerial parts and roots of Scorzonera cinerea, Scorzonera incisa, Scorzonera latifolia, Scorzonera mollis ssp. szowitsii, Scorzonera parviflora, and Scorzonera tomentosa collected from different regions of Anatolia and yaki sakizi which is prepared by drying the latex is obtained from the roots of Scorzonera latifolia were evaluated for their wound healing and anti-inflammatory effects. MATERIALS AND METHODS: In vivo wound healing activity of the plants was evaluated by linear incision and circular excision wound models. Hydroxyproline content of the treated tissues was also assessed. Acetic acid-induced capillary permeability test was used for anti-inflammatory activity. For the determination of the active constituents, a new high performance liquid chromatographic method was developed. Precision of the developed method was performed by the evaluation of intra-day and inter-day variations of the each standard at limits of quantification (LOQ) levels. RESULTS: The aqueous methanolic extracts of Scorzonera latifolia, Scorzonera mollis ssp. szowitsii demonstrated the highest activities. The main compound was detected as chlorogenic acid both in roots and aerial parts of the most Scorzonera species and hyperoside or rutin was determined as one of the main component of the aerial parts. CONCLUSION: The experimental study revealed that methanol-water extracts from aerial parts of Scorzonera latifolia and Scorzonera mollis ssp. szowitsii were found to have better activity on the wound healing compared to the other extracts and control groups. This might be due to the combined effect of the constituents present in the extracts.

Hepatoprotective and TNF-α inhibitory activity of Zosima absinthifolia extracts and coumarins.

Zosima absinthifolia (ZA) extracts and the coumarins (+)-columbianadin and (-)-deltoin were evaluated for their potential hepatoprotective and antiinflamatory effects in a CCl(4)-induced hepatotoxicity assay in rats and by the inhibition of TNF-α production on LPS-stimulated THP-1 macrophages, respectively. Both the ZA extracts and the coumarins showed hepatoprotective activity confirmed by monitoring the ALT/AST levels and by histopathological examination. The antiinflamatory activity, proved by the inhibition of TNF-α production, was found to be higher for the n-hexane root extract than for coumarins, suggesting synergic potential of the extract. The concentration of (-)-deltoin and (+)-columbianadin in extracts was determined by HPLC analysis.

Analgesic compounds from Scorzonera latifolia (Fisch. and Mey.) DC.

ETHNOPHARMACOLOGICAL RELEVANCE: A traditional mastic named yaki sakizi prepared from the roots of Scorzonera latifolia (Fisch. and Mey.) DC. is used as a folk remedy for treatment of pain in Turkish folk medicine. AIM OF THE STUDY: To isolate and identify the compounds responsible for the antinociceptive activity of S. latifolia using bioassay-guided fractionation. MATERIALS AND METHODS: The methanolic extract of the S. latifolia roots was prepared and subjected to isolation procedures such as solvent-solvent partitioning and column chromatography. Writhing and tail-flick tests were used to determine the antinociceptive activity. RESULTS: The n-hexane fraction of the S. latifolia root methanolic extract showed potent antinociceptive activity in both writhing and tail-flick tests. Three compounds were isolated from n-hexane fraction using bioassay-guided chromatographic purification. Isolated compounds were the triterpene taraxasteryl myristate, taraxasteryl acetate, and fern-7-en-3-beta-one, structures were elucidated by means of MS and NMR techniques. Both taraxasterol derivatives showed promising antinociceptive activity when compared to reference compounds. CONCLUSION: Results of the present study support the usage of S. latifolia in Turkish folk medicine. Both plant root extract and the isolated compounds showed promising antinociceptive activities. Our results suggested that antinociceptive activity of the plant extract is probably caused by the synergistic interaction of the isolated compounds.

Antioxidant properties of Viburnum opulus and Viburnum lantana growing in Turkey.

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.

Analgesic and hepatotoxic effects of Ononis spinosa L.

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.

Hepatoprotective and anti-inflammatory activities of Ballota glandulosissima.

Water extract of Ballota glandulosissima Hub.-Mor & Patzak (Lamiaceae) (BG) was investigated for anti-inflammatory activity using the carrageenan-induced rat paw oedema test and for hepatoprotective effect on carbon tetrachloride (CCl(4))-induced hepatotoxicity in rats. Biochemical parameters of hepatic damage such as serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP) and bilirubin concentrations were determined. CCl(4) (0.8 mL/kg i.p. for 7 days) treatment increased the serum AST, ALT, ALP and bilirubin levels significantly as compared to controls. Treatment of animals with BG (100 mg/kg, i.p.) +CCl(4) (0.8 mL/kg i.p.) for 7 days significantly ameliorated the levels of AST, ALT and ALP elevated by the CCl(4) treatment alone. The results of biochemical tests were also confirmed by histopathological examination. BG together with CCl(4) treatment decreased the balloning degeneration but did not produced apoptosis of hepatocytes, centrilobular and bridging necrosis observed in the CCl(4) treatment alone. BG, at 100 mg/kg per os, showed a significant reduction (34.22%) in rat paw oedema induced by carrageenan. The reference anti-inflammatory drugs etodolac (50 mg/kg, p.o.) and indomethacin (3 mg/kg, i.p.) significantly reduced the oedeme by 43.42 and 95.70%, respectively. The present study reveals that the water extract of Ballota glandulosissima possesses promising protective activity against CCl(4) induced hepatic damage and anti-inflammatory activity in rats.