Chisholm, M.G., Wilson, M.A., and Gaskey, G.M. 0 ). , which compares favorable to retention time Identification of potent flavor compounds formed in an aqueous lemon oil/citric acid emulsion. Compounds solved in the stationary phase stay put. Forschungsanst. {\displaystyle t_{i}} Högnadóttir, A., and Rouseff, R.L. {\displaystyle I_{n}=100c} {\displaystyle t_{0}} 18:106-115. {\displaystyle T} d {\displaystyle T} t t k While retention times vary with the individual chromatographic system (e.g. but shorter, following temperature programming experience. The method interpolates peaks between bracketing n-alkanes. Isothermal Kovats indices of hydrocarbon were measured by Axel Lubeck and Donald Sutton [5]. L S t Identification of the characteristic odorants in fresh Rhizomes of ginger (Zingiber officinale Roscoe) using aroma extract dilution analysis and modified multidimensional gas chromatography-mass spectroscopy. J. Agric. T Nishimura, O. 2003. Forschungsanst. {\displaystyle u} 2003a. u Temperatures of the temperature program stay the same, but ramps and times change when using a smaller column or faster carrier gas. » Kovats Ions Semiochemicals & Taxa Synthesis Control Invasive spp. J. Dt. i : Capillary tubes with uniform coatings have this phase ratio ß: Capillary inner diameter 2003a. 1999. T {\displaystyle T} 51:2687-2692. is independent of 47:665-670. T IUPAC defines the temperature programmed chromatography Kovats index equation: NOTE: TPGC index does depend on temperature program, gas velocity and the column used ! Techn. t = warming the column fruit. Adams, R.P. » Kovats Ions Semiochemicals & Taxa Synthesis Control Invasive spp. » Kovats Ions Semiochemicals & Taxa Synthesis Control Invasive spp. i {\displaystyle t_{i}-t_{0}} J. Agric. However, warmer columns Food Chem. 50:5386-5390. J. Agric. u {\displaystyle P^{i}} In gas chromatography, Kovats retention index (shorter Kovats index, retention index; plural retention indices) is used to convert retention times into system-independent constants. 43:2941-2945. Pyrolysis–gas chromatography–mass spectrometry, https://en.wikipedia.org/w/index.php?title=Kovats_retention_index&oldid=981101550, Articles with dead external links from October 2014, Creative Commons Attribution-ShareAlike License, This page was last edited on 30 September 2020, at 08:43. 2003a. {\displaystyle i=n} Food Chem. [1], The retention index of a chemical compound is retention time interpolated between adjacent n-alkanes. Pure liquid vapor pressure In gas chromatography, Kovats retention index (shorter Kovats index, retention index; plural retention indices) is used to convert retention times into system-independent constants. 2002. Identification of essential oil components by gas chromatography/mass spectrometry. Schieberle, P., and Grosch, W. 1988. i so that we do get shorter dependence depends on the compound compared to the n-alkanes. Jirovetz, L., Buchbauer, G., Stoyanova, A.S., Georgiev, E.V., and Damianova, S.T. The index is named after the Hungarian-born Swiss chemist Ervin Kováts, who outlined this concept during the 1950s while performing research into the composition of the essential oils. n 1995. . , any GC dimension Uni. i i :1-63. If column dimensions Length×diameter×film are divided by 2 and gas velocity is doubled by using H2 in place of He, the hold times must be divided by 4 and the ramps must be multiplied by 4 to keep the same index and the same retention temperature for the same compound analyzed. {\displaystyle d_{f}} J. Agric. c An extensive Kovats index database is compiled by NIST [1]. : R Method translation rules are incorporated in some chromatography data systems. i » Kovats Ions Semiochemicals & Taxa Synthesis Control Invasive spp. Allured Publishing Corporation, Carol Stream, IL. i :1-63. with regards to column length, film thickness, diameter and inlet pressure), the derived retention indices are quite independent of these parameters and allow comparing values measured by different analytical laboratories under varying conditions and analysis times from seconds to hours. {\displaystyle L} {\displaystyle t_{i}} 51:3854-3857. can be expressed explicit for retention time: Retention time 1995. Volatile compounds isolated from edible Korean chamchwi (Aster scaber Thunb). Food Chem. Uni. R {\displaystyle S_{i}} L i have a direct relation with 0 {\displaystyle d_{c}} Allured Publishing Corporation, Carol Stream, IL. J. Agric. T Tables of retention indices are used to identify peaks by comparing measured retention indices with the tabulated values.[2][3][4]. n Food Chem. / Food Chem. J. Agric. Characterization of aroma volatiles in key lime essential oils (Citrus aurantifolia Swingle). d i {\displaystyle T} i {\displaystyle t_{i}} {\displaystyle S_{i}} Rychlik, M., Schieberle, P., and Grosch, W. 1998. 998:201-211. Compilation of odour thresholds, odour qualities and retention indices of key food odorants. . = J. Chromatogr. Chung, T.Y., Eiserich, J.P., and Shibamoto, T. 1993a. Above capacity factor 36:797-800. k in the stationary liquid polymer phase is called the capacity factor {\displaystyle k_{i}} {\displaystyle d_{f}} Measured Kovats retention index values can be found in ASTM method D 6730 databases. » Kovats Ions Semiochemicals & Taxa Synthesis Control Invasive spp. {\displaystyle k_{i}}

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