Chemical composition and antimicrobial activity of the essential oil from aerial parts of Micromeria fruticulosa (Bertol.) Grande (Lamiaceae) growing wild in Southern Italy

The essential oil of aerial parts of Micromeria fruticulosa (Lamiaceae) growing wild in Southern Italy was obtained by hydrodistillation and analysed by GC and GC–MS. Sixty-one compounds, representing 91.3% of the oil, were identified. The major components were γ-terpinene (14.5%), β-caryophyllene (12.6%), p-cymene (8.9%), α-pinene (8.2%) and β-bisabolene (7.2%). The essential oil showed action mainly against Gram-positive bacteria. Copyright © 2007 John Wiley & Sons, Ltd.

Volatile components from flower-heads of Centaurea nicaeensis All., C. parlatoris Helder and C. solstitialis L. ssp. schouwii (DC.) Dostál growing wild in southern Italy and their biological activity.

The volatile constituents of the flowerheads of Centaurea nicaeensis All., C. parlatoris Helder and C. solstitialis L. ssp. schouwii (DC.) Dostal were extracted by hydrodistillation and analysed by GC and GC-MS. Altogether 113 components were identified. Fatty acids and hydrocarbons were the most abundant components in the oils. Caryophyllene and caryophyllene oxide were the main compounds of the sesquiterpene fraction. The study on the biological activity of the oils shows no significant activity.

Chemical composition of the essential oil of Phagnalon saxatile (L.) Cass. (Asteraceae) growing wild in Southern Italy

Abstract The essential oil from aerial parts of Phagnalon saxatile (L.) Cass. (Asteraceae) was obtained by hydrodistillation. The oil content was 0.15% (v/w), on a dry weight basis. The oil composition was analyzed by GC and GC/MS. Altogether 66 compounds were identified accounting for 93.2% of the oil. Sesquiterpenes represent the 23.9% of the oil. In the oil were also present fatty acids (21.8%) and waxes (19.3%). The oil shows no antibacterial activity.

The first example of natural cyclic carbonate in terpenoids

Abstract The first natural occurring cyclic carbonate terpenoid, the guaianolide hololeucin ( 1 ), was isolated from the aerial part of Centaurea hololeuca . Its structure was elucidated on the basis of extensive proton, 13 C and two-dimensional NMR experiments, as well as by transformation in its diacetyl derivative.

Antibacterial and anticoagulant activities of coumarins isolated from the flowers of Magydaris tomentosa (Desf.) DC (Apiaceae)

The phytochemical investigation of the acetone and methanol extracts of the flowers of Magydaris tomentosa (Desf.) DC afforded six known coumarins as well as (+)-meranzin hydrate (7), not previously reported as a natural product. The antibacterial activity of umbelliprenin (1), osthol (2), imperatorin (3), citropten (4) and (+)-meranzin hydrate (7) was tested against Gram-positive and Gram-negative bacteria. All coumarins (1-7) isolated in this study inhibited growth of all bacterial strains tested (MIC between 16 and 256 μg/mL), the most active being imperatorin (3) (MICs between 32 and 128 μg/mL) and citropten (4) (MICs between 16 and 256 μg/mL). The anticoagulant activity of compounds 1-…

A new irregular diterpenoid of biogenetic interest from the flowers of Magydaris tomentosa (Desf.) DC. (Apiaceae)

A new irregular acyclic diterpene, magytomol acetate (2), has been isolated from the light petroleum extract of the flowers of Magydaris tomentosa (Desf.) DC. (Apiaceae) and its structure has been elucidated by means of extensive spectroscopic experiments. The new compound can be considered the acetyl derivative of the biogenetic precursor of other irregular diterpenes isolated from other species belonging to the family Apiaceae.

Cytotoxic Activity of Some Natural and Synthetic ent-Kauranes

Atractyligenin (1) and several synthetic derivatives were tested and found to be active against tumor cell replication. Compound 1 was readily converted to the 2,15-diketo (3) or 15-keto (4) derivatives, which contain an alpha,beta-unsaturated ketone. Compounds 3 and 4 showed significant cytotoxic activity against all six tested cancer cell lines and were most potent against 1A9 ovarian cancer cells with EC50 values of 0.2 and 0.3 microM, respectively. These two 1-analogues are promising lead compounds for further investigation.

Nuovi flavonoidi da Bonannia graeca (L.) Halácsy e loro attività biologica

Chemical composition and biological activity of volatiles from flowerheads of Centaurea polymorpha Lag. (Asteraceae)

Essential Oil Composition of Tanacetum vulgare Subsp. Siculum (Guss.) Raimondo et Spadaro (Asteraceae) from Sicily

Ninety-four components of the essential oils from aerial parts and capitula of Tanacetum vulgare subsp. siculum (Guss.) Raimondo et Spadaro were detected. α-Thujone, β-thujone and 1,8-cineole were the main constituents of the oils. The analysis allows the assignment of this Tanacetum species to the thujone chemotype.

New oxidative derivatives of atractyligenin and their cytotoxic activity

ent-Kauranes are naturally occurring diterpenoids isolated from several families, such as Asteraceae and Lamiaceae. These compounds have attracted interest because of their structures and their biological activities as anti-tumorals, anti-HIV and anti-bacterials [1]. Extensive chemical work [2] was carried out on the structure of atractyligenin, the nor-diterpene aglycone of the glucoside atractyloside, occurring, together with its diterpene homologous carboxy-atractyloside, in the root of Atractylis gummifera L. (Compositae). The interest for these compounds was stimulated by the high toxicity [3] of both glucosides, responsible of many deadly poisoning in past time. Due to the 15-hydroxyl…

Two New Flavonoids fromBonannia graeca: a DFT-NMR Combined Approach in Solving Structures

Two new cyclized C-geranylated flavonoids, the dihydroflavonol bonanniol C (4a) and the flavanone bonannione B (6a), were isolated as minor compounds from the aerial parts of Bonannia graeca (Umbelliferae). Their structures were elucidated by a combined approach of extensive spectroscopic means and quantum mechanical methods. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

Volatile components from flowers of Centaurea nicaeensis All., C. parlatoris Helder, C. solstitialis L., ssp. schouwii (DC.) Dostàl wild growing in Sicily and their biological activity

The volatile constituents of the flowerheads of Centaurea nicaeensis All., C. parlatoris Helder and C. solstitialis L. ssp. schouwii (DC.) Dostal were extracted by hydrodistillation and analysed by GC and GC-MS. Altogether 113 components were identified. Fatty acids and hydrocarbons were the most abundant components in the oils. Caryophyllene and caryophyllene oxide were the main compounds of the sesquiterpene fraction. The study on the biological activity of the oils shows no significant activity.

Attività citotossica di derivati ent-kauranici.

Hastifolins A-G, antefeedant neo-clerodane diterpenoids from Scutellaria hastifolia

From the aerial parts of Scutellaria hastifolia, family Lamiaceae (Labiatae), seven neo-clerodane diterpenoids (hastifolins A-G) were isolated. The products are similar to the known scuteparvin and are characterized by being trans-cinnamoyl derivatives. Structures and stereochemistry were determined by intensive NMR investigation. Six of the products form three pairs of epimers at C-13. Hastifolins A-C showed significant antifeedant activity.

Biological activities of natural guaianolides from Centaurea hololeuca Boiss and their derivatives

Chemical composition of the essential oil from the aerial parts of Micromeria fruticolosa (Bertol.) Grande (Lamiaceae) growing wild in Southern Italy.

Antibacterial and anticoagulant activities of coumarins isolated from the flowers of Magydaris tomentosa.

The phytochemical investigation of the acetone and methanol extracts of the flowers of Magydaris tomentosa (Desf.) DC afforded six known coumarins as well as (+)-meranzin hydrate (7), not previously reported as a natural product. The antibacterial activity of umbelliprenin (1), osthol (2), imperatorin (3), citropten (4) and (+)-meranzin hydrate (7) was tested against Gram-positive and Gram-negative bacteria. All coumarins (1-7) isolated in this study inhibited growth of all bacterial strains tested (MIC between 16 and 256 microg/mL), the most active being imperatorin (3) (MICs between 32 and 128 microg/mL) and citropten (4) (MICs between 16 and 256 microg/mL). The anticoagulant activity of …