Yayın tarihi için Makale Koleksiyonu listeleme
Toplam kayıt 488, listelenen: 21-40
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Studies on Turkish rose concrete, absolute and hydrosol
(2003)The production of rose absolute from fresh flowers of the cultivated Rosa damascene Miller was realized using traditional and modern techniques, such as molecular distillation, extraction with liquified gases, etc. Headspace ... -
Antioxidant properties and phenolic composition of Sideritis species
(Kluwer Academic/Plenum Publishers, 2004)The antioxidant properties and phenolic composition of 27 Sideritis species were studied. Plant samples were extracted with petroleum ether using a Soxhlet apparatus. The defatted plant materials were extracted with 70% ... -
Essential oils of Sideritis species of turkey belonging to the section Empedoclia
(Springer, 2004)The paper summarizes the work done on the essential oil content and composition of fifty Sideritis species of Turkey belonging to the section Empedoclia. The water-distilled oils were analyzed by GC/MS. The oils were ... -
An improved HPLC post-column methodology for the identification of free radical scavenging phytochemicals in complex mixtures
(Springer Heidelberg, 2004)The importance of natural antioxidants principally relates to their health-promoting properties. The discovery of new sources of established compounds or more potent compounds is a costly exercise and any technique capable ... -
Essential Oil of Betula pendula Roth. Buds
(Hindawi LTD, 2004)The essential oil of Betula pendula Roth. buds was obtained using both hydrodistillation and microdistillation techniques and their chemical compositions were analyzed using both gas chromatography ( GC) and gas ... -
Screening of free radical scavenging compounds in water extracts of Mentha samples using a postcolumn derivatization method
(American Chemical Society, 2004)An on-line high-performance liquid chromatography-1,1-diphenyl-2-picrylhydrazyl (HPLC-DPPH.,) method has been improved for the detection of polar and nonpolar radical scavenging compounds in complex plant extracts. Nine ... -
In vitro biological activity and essential oil composition of four indigenous South African Helichrysum species
(Elsevier Sci Ireland LTD, 2004)Helichrysum species are used widely to treat various medical conditions. In this study, the anti-microbial, anti-oxidant (DPPH assay) and anti-inflammatory activity (5-lipoxygenase assay) of Helichrysum dasyanthum, Helichrysum ... -
Essential oil composition and in vitro antimicrobial and anti-inflammatory activity of South African Vitex species
(NISC Pty Ltd, 2004)The essential oil composition of Vitex pooara, V. rehmannii, V. obovata ssp. obovata, V. obovata ssp. wilmsii and V. zeyheri was determined using gas chromatography and mass spectrometry. The in vitro antimicrobial activity ... -
New, sesquiterpenoid-type bicyclic compounds from the buds of Betula pubescens - Ring-contracted products of beta-caryophyllene?
(Wiley-V C H Verlag GMBH, 2004)The essential oils obtained from the buds of Betula pubescens ssp. pubescens and B. pubescens ssp. czerepanovii were analyzed both by GC and GC/MS and, of the 31 compounds identified, 14-acetoxy-beta-caryophyllene was ... -
The essential oil of Senecio farfarifolius Boiss. et Kotschy growing in Turkey
(Allured Publ Corp, 2004)Water-distilled essential oil from the aerial parts of Senecio farfarifolius Boiss. et Kotschy, endemic in Turkey, was analyzed by GC and GC/MS. Eighty-seven components were characterized representing 95% of the compounds ... -
Comparison of the essential oils of Origanum majorana L. and Origanum x majoricum Cambess.
(Allured Publ Corp, 2004)Origanum majorana L. (Lamiaceae) has two chemtypes in Turkey. The type growing in the southwestern part of the Mediterranean region is characterized by rich oil yield and high carvacrol content. This type known as 'beyaz ... -
A potential new source of cedarwood oil: Juniperus foetidissima Willd.
(Allured Publ Corp, 2004)The chemical compositions of essential oils from heartwood of the root and stem of Juniperus foctidissima Willd. collected in the vicinity of Eskisehir, Turkey were analyzed by GC/MS. The yield of stein and root heartwood ... -
Composition of the essential oil of Achillea sieheana stapf and the enantiomeric distribution of camphor
(Allured Publ Corp, 2004)A water distilled oil from the aerial parts of Achillea sieheana Stapf(Compositae), an endemic species in Turkey, Was analyzed by GC/MS. Enantiomerically pure (1S)(-)-camphor (39.9%) was identified as a main constituent ... -
Essential oils of three species of Heracleum. Anticandidal activity
(Springer, 2004)Fruits of Heracleum crenatifolium Boiss., Heracleum sphondylium L subsp. ternatum (Velen.) Brummitt, and Heracleum platytaenium Boiss. (Umbelliferae) were hydrodistilled to obtain essential oils that were then analyzed by ... -
Phenolic composition of strawberry genotypes at different maturation stages
(American Chemical Society, 2004)The effects of maturation (green, pink, and ripe) on phenolic composition of strawberry cultivars Camarosa, Dorit, Chandler, and Osmanli and their hybrids were investigated using a high-pressure liquid chromatography (HPLC) ... -
Volatile flavour components of mandarin wine obtained from clementines (Citrus reticula Blanco) extracted by solid-phase microextraction
(John Wiley & Sons LTD, 2004)The volatile flavour constituents of mandarin wine obtained from clementine (Citrus reticula Blanco) were analysed by headspace solid-phase microextraction (HS-SPME) and immersion solid-phase microextraction (Im-SPME) ... -
A comparative study of the essential oils of wild and cultivated Satureja hortensis L.
(Allured Publ Corp, 2004)The essential oils from 20 samples of wild and cultivated collections of Satureja hortensis L. were investigated by GC and GC/MS. The oils from cultivated forms contained carvacrol (42-63%) as the major constituent. Thymol ... -
Composition and the in vitro antimicrobial activities of the essential oils of some Thymus species
(Verlag Z Naturforsch, 2004)The genus Thymus (Lamiaceae) is represented by 38 species (64 taxa) in Turkey, and 24 of which are endemic to Turkey. Aerial parts of Thymus longicaulis subsp. chaubardii var. chaubardii, T zygioides var. lycaonicus, T ... -
Estrogenic activity of isolated compounds and essential oils of Pimpinella species from turkey, evaluated using a recombinant yeast screen
(Georg Thieme Verlag Kg, 2004)Several plants and plant-derived pure compounds, designated as phytoestrogens, have been reported to cause estrogenic effects. They have been used for alleviation of menopausal symptoms, prevention of osteoporosis, heart ...