A generalization of the retention index system including linear temperature programmed gas-liquid partition chromatography.
TL;DR: The equation given by Kovats for the calculation of the retention index in case of isothermal operation is transformed to a more general form to include also the case of linear temperature programmed operation and gives the same retention index for both ways of operation.
About: This article is published in Journal of Chromatography A.The article was published on 1963-01-01. It has received 5192 citations till now. The article focuses on the topics: Kovats retention index.
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TL;DR: In this article, some 900 Kovats' indices of 400 individual compounds on methyl silicone (dimethyl polysiloxane) and/or Carbowax 20M liquid phases are summarized from the general literature.
2,118 citations
TL;DR: Eleven essential oils, namely, Cananga odorata (Annonaceae), Cupressus sempervirens (Cupressaceae), Curcuma longa (Zingiberaceae), Cymbopogon citratus (Poaceae), Pinus radiata (Pinaceae), Piper crassinervium (Piperaceae), Psidium guayava (Myrtaceae), Rosmarinus officinalis (Lamiaceae), Thymus x citri
1,137 citations
Cites methods from "A generalization of the retention i..."
...A mixture of aliphatic hydrocarbons (C8–C24) in hexane (Sigma–Aldrich, St. Louis, USA) was injected as under the above-mentioned temperature programme to calculate the retention indices using the generalized equation of Van den Dool and Kratz (1963)....
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TL;DR: In this article, the antioxidant properties of the essential oil from oregano in relation to its chemical composition were examined and the antioxidant activity was investigated with three different methods: the β-carotene bleaching (BCB) test, the 2,2′-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method and the TBARS assay.
837 citations
TL;DR: The essential oils obtained from the aerial parts of Origanum scabrum and Origaum microphyllum exhibited a very interesting antimicrobial profile after they were tested against six Gram-negative and -positive bacteria and three pathogenic fungi.
Abstract: The essential oils obtained from the aerial parts of Origanum scabrum and Origaum microphyllum, both endemic species in Greece, were analyzed by means of GC and GC-MS. Forty-eight constituents were...
810 citations
01 Jan 2004
TL;DR: In this article, the antioxidant properties of the essential oil from oregano in relation to its chemical composition were examined and the antioxidant activity was investigated with three different methods: the b-carotene bleaching (BCB) test, the 2,2 0 -diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method and the TBARS assay.
Abstract: The antioxidant properties of the essential oil from oregano in relation to its chemical composition were examined. The antioxidant activity was investigated with three different methods: the b-carotene bleaching (BCB) test, the 2,2 0 -diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method and the thiobarbituric acid reactive species (TBARS) assay. It was found that the total essential oil, its fraction as well as its pure constituents have a significant antioxidant effect when tested by each method, respectively. Generally the antioxidant activity of the oregano essential oil is less effective than the ascorbic acid, but comparable with the a-tocopherol and the synthetic antioxidant butylated hydroxytoluene (BHT). The synergy among minor oxygen containing compounds was suggested as possible factor, which influenced the antioxidant power of the oregano essential oil. The antioxidant concentrations influenced its antioxidant power, too. # 2003 Elsevier Ltd. All rights reserved.
673 citations
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TL;DR: In this article, a simple relation exists between the retention index of a compound on a non-polar stationary phase and its boiling point, which is defined as the ratio of the boiling point of the compound to its retention index.
Abstract: For the characterization of organic substances in gas chromatography a number termed «retention index» is proposed. A simple relation exists between the retention index of a compound on a non-polar stationary phase and its boiling point.
1,916 citations
TL;DR: Branched chain aldehydes isolated from animal tissues have been shown to belong to either the iso- or anteiso-series of compounds by oxidising them to the corresponding acids and comparing the gas chromatographic behaviour of these acids with that of pure synthetic acids of known structure.
14 citations
TL;DR: In this article, the relative retention times of organic compounds on tri-m -tolyl phosphate and β,β′-oxydipropionitrile columns have been determined and tabulated.
10 citations
TL;DR: In this article, the selective sorption of various aromatic compounds boiling at temperatures up to 350° was studied on a polar phase (Reoplex 400) and a non-polar Apiezon L.
7 citations