Antiinflammatory and antioxidant activity of Hypericum rumeliacum Boiss. subsp. apollinis (Boiss. & Heldr.) Robson & Strid methanol extract.

Plants of the genus Hypericum are widely used in folk medicine for the treatment of gastric ailments (including pectic ulcers), burns, swelling, inflammation, anxiety, as well as for bacterial and viral infections. The aerial parts of Hypericum rumeliacum Boiss. subsp. apollinis (Boiss. & Heldr.) Robson & Strid (Guttiferae), a perennial herb growing wild in Greece, were subjected to biological and phytochemical studies. The H. rumeliacum methanol extract showed, on the DPPH test, antioxidant activity (IC(50) = 23.61 microg/mL). The antiinflammatory activity of the extract (70 mg/kg, i.p.), in the carrageenan-induced paw oedema in rat, was studied. In this experimental model an inhibition of paw oedema, significant from the first to third hour, was observed. The histological examination confirmed resolution of the inflammatory process observed in vivo. Through HPLC analysis of the H. rumeliacum methanol extract, the naphthodianthrones hypericin, pseudohypericin and some polyphenol compounds, such as chlorogenic acid, rutin and isoquercitrin, were identified and quantified. The antioxidant activity of H. rumeliacum could be chiefly related to polyphenol compounds that are well known as the main contributors to the free radical-scavenging effects. The antiinflammatory effect of the methanol extract of the aerial parts could be due to the synergic action both of hypericin and polyphenol compounds.

Pharmacological activities of some Argyranthemum species growing in the Canary Islands.

Methanolic extracts of eight subspecies of genus Argyranthemum were evaluated against brine shrimps, human cancer cell lines, malarial parasites and microorganisms under in vitro conditions. In the shrimp assay, samples of A. adauctum ssp. adauctum, A. adauctum ssp. erythrocarpon and A. frutetescens ssp. succulentum were active with ED50 values in the range of around 300 to 360 microg/ml. In the Caco-2, HepG2 and MCF-7 cell lines, the samples A. adauctum ssp. jacobaeifolium and A. adauctum ssp. palmensis were active with LC50 values ranging between 80-90 microg/ml. The secondary assay results of antimalarial activity of samples, A. adauctum ssp. adauctum, A. adauctum ssp. dugourii, A. adauctum ssp. erythrocarpon and A. adauctum ssp. jacobaeifolium have IC50 values <50 microg/ml. The samples demonstrated broad specific antimicrobial activity against five different microorganisms.

Chemical analysis and antifungal activity of Thymus striatus.

The essential oil composition from Thymus striatus collected from Mountain Orjen (Montenegro) has been investigated by gas chromatography-mass spectrometry. Thymol, gamma-terpinene and p-cymene were found to be the major components. Furthermore, the oil and its major component, thymol, were analysed for potential antifungal activity against plant, animal and human pathogenic fungi from different genera by a macrodilution test. The oil exhibited a strong inhibitory effect against all fungi investigated.

Cytotoxic activities of some Greek Labiatae herbs.

Nineteen methanolic crude plant extracts of Labiatae family, collected in Greece from different locations, were evaluated for cytotoxic activity against brine shrimps and three human cancer cell lines along with a normal mouse cells as a control cell line. In the brine shrimp lethality test, Mentha pulegium was the only sample found to be active with an LC(50) value 347.3 micro g/ml, while all remaining samples had LC(50) values greater than 1000 micro g/ml. In case of Caco-2 and HepG2 cell lines, only one sample, namely Thymus parnassicus Halacsy, was active with LC(50) values 44.6 and 50.3 micro g/ml respectively, while against MCF-7 cell line, two samples, namely, Clinopodium vulgare L. (LC(50): 60.4 micro g/ml), and Thymus parnassicus Halacsy (LC(50): 54.7 micro g/ml), were found active.

Essential oil composition and antifungal activity of Foeniculum vulgare Mill obtained by different distillation conditions.

The influence of different hydrodistillation conditions was evaluated from the standpoint of essential oil yield, chemical composition and antifungal activity from seeds of Foeniculum vulgare Mill. Three hydrodistillation conditions were considered. The main constituents of the oils were: (E)-anethole (72.27%-74.18%), fenchone (11.32%-16.35%) and methyl chavicol (3.78%-5.29%). The method of distillation significantly effected the essential oil yield and quantitative composition, although the antifungal activity of the oils against some fungi was only slightly altered.

Composition and antimicrobial activity of the essential oil of Hypericum rumeliacum subsp. apollinis (Boiss. & Heldr.).

The composition and the antimicrobial activity of the aerial parts of Hypericum rumeliacum are reported. Analysis was carried out by GC/MS. The major constituents were alpha-pinene (43.80%), beta-pinene (9.82%), dehydro-aromadendrene (6.81%) and alpha-copaene (5.41%). The essential oil showed a moderate in vitro activity against the six Gram negative and positive bacteria and a stronger one against the three-tested pathogenic activity.

Antioxidant and cytotoxic activities of Hypericum sp. on brine shrimps and human cancer cell lines.

Ten different samples of five Hypericum sp. were tested on brine shrimps, human colon carcinoma and human hepatoma cell lines for their cytotoxic activities. H. triquetrifolium Turra. (Rafina) showed the highest activity (LC50 = 22 mg/mL) on brine shrimps, while the extracts of the other nine samples showed significant to moderate activities (LC50 from 37 to 107 mg/mL). H. empetrifolium Wild. (Parnon) showed the highest activity in human colon carcinoma and human hepatoma cell lines, with LC50 values 29 and 25.1 mg/mL, respectively, while the LC50 values of the other samples were more than 45 mg/mL. It is very interesting to observe that most Hypericum samples showed good antioxidant activity in vitro.

Composition and antimicrobial activity of the essential oil of Ballota pseudodictamnus L. Bentham.

The chemical composition of the essential oil of Ballota pseudodictamnus obtained from the aerial parts was analysed by GC/MS. From the 52 identified constituents of the oil, caryophyllene oxide, phytol and gamma-muurolene were the major components. Furthermore, the essential oil was investigated for its antimicrobial activity.

Antifungal activities of selected aromatic plants growing wild in Greece.

Essential oils of Origanum onites, Satureja thymbra, Salvia fruticosa (Greek sage), and Salvia pomifera subsp. calycina plants growing wild in Greece and their components carvacrol, camphor, and 1,8-cineole, were assayed for antifungal activity against 13 fungal species. Among the fungi tested were food poisoning, plant, animals and human pathogenic species. The oils presented various degrees of inhibition against all the fungi investigated. The highest and broadest activity was shown by the carvacrol content oils (O. onites and S. thymbra), while the oil of sage was the least effective. Carvacrol exhibited the highest and 1,8-cineole the lowest level of antifungal activity among the components tested.

Essential oil of Phlomis lanata growing in Greece: chemical composition and antimicrobial activity.

The essential oil obtained from the aerial parts of Phlomis lanata has been analyzed by GC/MS. 48 compounds representing 96.85% of the oil were identified; alpha-pinene, limonene and trans-caryophyllene were found as its main components. The essential all showed a moderate in vitro activity against six Gram (+/-) bacteria and a stronger one against the three tested pathogenic fungi.

Antiphage properties of some Greek algae extracts.

The ethanol extracts of 35 algae collected in several Greek shores, were screened for antiphage properties against 6 bacteriophages: coliphages T 1, T 2, T 4, T 7, ΦX 174 and MS 2. Five samples were found to induce a mild antiphage activity.