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Author:Orav, A

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29 matching references were found.

Eisen, O.; Orav, A., Eesti NSV Tead. Akad. Toim. Keem. Geol., 1970, 19, 3, 202. [all data]

Orav, A.; Eisen, O., The retention indexes for alkenes, alkynes and cyclenes on capillary columns, Izv. Akad. Nauk Est. SSR, Khim. Geol., 1972, 21, 1, 39-47. [all data]

Orav, A.; Kuningas, K.; Kailas, T.; Koplimets, E.; Rang, S., Effect of adsorption on the retention values in capillary columns coated with OV-225 and PEG 20M, J. Chromatogr. A, 1994, 659, 1, 143-150, https://doi.org/10.1016/0021-9673(94)85016-X . [all data]

Rang, S.; Kuningas, K.; Orav, A.; Eisen, O., Capillary gas chromatography of n-alkynes. I. Retention indices, J. Chromatogr., 1976, 119, 451-460, https://doi.org/10.1016/S0021-9673(00)86807-7 . [all data]

Rang, S.; Kuningas, K.; Strenze, T.; Orav, A.; Eisen, O., Retention and Thermodynamics of Solution of n-Alkenes in OV-101, J. Chromatogr., 1987, 406, 75-80, https://doi.org/10.1016/S0021-9673(00)94018-4 . [all data]

Rang, S.; Orav, A.; Kuningas, K.; Eisen, O., Capillary Gas Chromatography of Monosubstituted Cyclopentenes and Cyclohexenes, Chromatographia, 1977, 10, 3, 115-122, https://doi.org/10.1007/BF02297862 . [all data]

Rang, S.; Kuningas, K.; Orav, A.; Eisen, O., Capillary Gas Chromatography of C6-C14 n-Alkenes on Polyphenyl Ether and Polyethylene Glycol 4000, Chromatographia, 1977, 10, 2, 55-64, https://doi.org/10.1007/BF02274460 . [all data]

Orav, A.; Kuningas, K.; Rang, S., A comparison of different retention index systems with unsaturated and aromatic hydrocarbons in capillary gas chromatography on PEG 20MK, Chromatographia, 1993, 37, 7/8, 411-414, https://doi.org/10.1007/BF02272257 . [all data]

Orav, A.; Kailas, T.; Liiv, M., Analysis of terpenoic composition of conifer needle oils by steam distillation/extraction, gas chromatography and gas chromatography-mass spectrometry, Chromatographia, 1996, 43, 3/4, 215-219, https://doi.org/10.1007/BF02292955 . [all data]

Orav, A.; Kailas, T., Correlation equations describing retention index data for n-alkylcyclopentenes, n-alkylcyclohexenes and n-alkyl esters on OV-101, OV-225 and PEG 20M, Chromatographia, 1996, 43, 9/10, 557-558, https://doi.org/10.1007/BF02293010 . [all data]

Orav, A.; Kuningas, K.; Kailas, T., Computerized capillary gas chromatographic identification and determination of Siberian fir oil constituents, J. Chromatogr. A, 1995, 697, 1-2, 495-499, https://doi.org/10.1016/0021-9673(94)01059-N . [all data]

Eisen, O.; Orav, A.; Rang, S., Identifizierung von Normal-Alkenen, Cyclopentenen und -Hexenen mittels Kapillar-Gas-Chromatographie. Identification des alcènes, cyclopentènes et -hexènes à l'aide de la chromatogrpahie en phase gazeuse sur colonne capillaire, Chromatographia, 1972, 5, 11, 229-239, https://doi.org/10.1007/BF02270600 . [all data]

Orav, A.; Kailas, T.; Ivask, K., Volatile constituents of Matricaria recutita L. from Estonia, Proc. Est. Acad. Sci. Chem., 2001, 50, 39-45. [all data]

Orav, A.; Kann, J., Determination of peppermint and orange aroma compounds in food and beverages, Proc. Est. Acad. Sci. Chem., 2001, 50, 4, 217-225. [all data]

Raal, A.; Arak, E.; Orav, A.; Ivask, K., Comparison of essential oil content of Matricaria recutita L. from different origins, Ars Pharm., 2003, 44, 2, 159-165, retrieved from http://www.ugr.es/~ars/abstract/44-159-03.pdf. [all data]

Orav, A.; Stulova, I.; Kailas, T.; Müürisepp, M., Effect of storage on the essential oil composition of piper nigrum L. fruits of different ripening states, J. Agric. Food Chem., 2004, 52, 9, 2582-2586, https://doi.org/10.1021/jf030635s . [all data]

Orav, A.; Kuningas, K.; Rang, S.; Eisen, O., Capillary gas chromatography of monosubstituted cyclopentenes and cyclohexenes C8-C15 on polyethylene glycol 20M, Eesti NSV Tead. Akad. Toim. Keem., 1982, 40-49. [all data]

Orav, A.; Kuningas, K.; Rang, S.; Eisen, O., Capillary gas chromatography of n-tridecenes, n-tetradecenes and C10-C14 n-alkynes on polyethylene glycol 20m of different polarity, Eesti NSV Tead. Akad. Toim. Keem., 1985, 34, 2, 105-113. [all data]

Raal, A.; Paaver, U.; Arak, E.; Orav, A., Content and composition of the essential oil of Thymus serpyllum L. growing wild in Estonia, Medicina (Kaunas), 2004, 40, 8, 795-800. [all data]

Orav, A.; Kailas, T.; Jegorova, A., Composition of the essential oil of dill, celery, and parsley from Estonia, Proc. Est. Acad. Sci. Chem., 2003, 52, 4, 147-154. [all data]

Orav, A.; Kailas, T.; Müürisepp, M., Composition of blackcurrant aroma isolated from leaves, buds, and berries of Ribes nigrum L., Proc. Est. Acad. Sci. Chem., 2002, 51, 4, 225-234. [all data]

Orav, A.; Raal, A.; Arak, E.; Müürisepp, M.; Kailas, T., Composition of the essential oil of Artemisia absinthium L. of different geographical origin, Proc. Est. Acad. Sci. Chem., 2006, 55, 3, 155-165. [all data]

Raal, A.; Arak, E.; Orav, A., Comparative chemical composition of the essential oil of Thymus vulgaris L. from different geographical sources, Herba Polonica, 2005, 51, 1/2, 10-17. [all data]

Raal, A.; Arak, E.; Orav, A., Chemical composition of coriander seed essential oil and their conformity with EP standards, Agraarteadus, 2004, 15, 4, 234-239. [all data]

Raal, A.; Orav, A.; Arak, E.; Kailas, T.; Müürisepp, M., Variation in the composition of the essential oil of Valeriana officinalis L. roots from Estonia, Proc. Est. Acad. Sci. Chem., 2007, 56, 2, 67-74. [all data]

Orav, A.; Kailas, T.; Muurisepp, M.; Kann, J., Composition of the oil from waste tires. 2. Fraction boiling at 160-180 0C, Proc. Estonian Acad. Sci. Chem., 1999, 48, 3, 136-140. [all data]

Orav, A.; Kailas, T.; Muurisepp, M.; Kann, J., Composition of the oil from waste tires. 1. Fraction boiling at yp to 160 0C, Proc. Estonian Acad. Sci. Chem., 1999, 48, 1, 30-39. [all data]

Orav, A.; Eizen, O., Determination of normal olefins in shale oil coking distillates by capillary gas chromatography, Eesti NSV teaduste akadeemia, 1971, 20, 2, 120-126. [all data]

Rang, S.A.; Orav, A.E.; Kuningas, K.R.; Meister, A.E.; Strense, T.V.; Eisen, O.G., Gas-Chromatographic Characteristics of unsaturated hydrocarbons, Academy of Sciences of Estonia SSR, Tallinn, Estonia SSR, 1988, 208. [all data]