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191 results on '"K. Szendrei"'

1. A curious case of dietary supplement adulteration: Cyanotis arachnoidea as fake spinach on the European market

Author

Attila Hunyadi, Gábor Tóth, K. Szendrei, M. Báthori, K Lengyel, and I. Herke

Subjects
Pharmacology, Traditional medicine, biology, business.industry, Organic Chemistry, Dietary supplement, Pharmaceutical Science, biology.organism_classification, Analytical Chemistry, Complementary and alternative medicine, Drug Discovery, Molecular Medicine, European market, Spinach, Medicine, Food science, business, Cyanotis arachnoidea
Published
2014
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2. Rapid identification of sibutramine in dietary supplements using a stepwise approach

Author

D, Csupor, K, Boros, B, Dankó, K, Veres, K, Szendrei, and J, Hohmann

Subjects
Spectrometry, Mass, Electrospray Ionization, Magnetic Resonance Spectroscopy, Appetite Depressants, Dietary Supplements, Color, Spectrophotometry, Ultraviolet, Chromatography, Thin Layer, Drug Contamination, Chromatography, High Pressure Liquid, Cyclobutanes
Abstract

Adulteration of botanical food supplements with undeclared synthetic drugs is a common problem. One of the most affected product groups are the slimming agents. There are no analytical protocols for the detection of synthetic adulterants from these products. The present study aimed at the development of a multistep analytical method for the quick and reliable determination of sibutramine, one of the most common adulterants among botanical food supplements. The extract of a sibutramine-containing slimming formula was analysed by colour tests, TLC, HPLC-DAD, MS and NMR. The multistep method proposed by the authors allows the quick identification of sibutramine in counterfeit samples in laboratories with different instrumentation.

Published
2013

3. Phythochemical analysis of Uncaria products commercially available in Hungary

Author

Dezső Csupor, J Hohmann, K. Szendrei, B. Csapi, and Katalin Veres

Subjects
Pharmacology, Traditional medicine, biology, business.industry, Organic Chemistry, Pharmaceutical Science, biology.organism_classification, Analytical Chemistry, Uncaria, Complementary and alternative medicine, Drug Discovery, Molecular Medicine, Medicine, business
Published
2008
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5. New Ecdysteroids from Serratula tinctoria

Author

R. Lafont, D. Rudel, J.-P. Girault, M. Bathori, I. Racz, J. Gharbi, K. Melis, and K. Szendrei

Subjects
Pharmacology, Rubrosterone, Polypodine B, Chromatography, biology, Stereochemistry, Organic Chemistry, Pharmaceutical Science, biology.organism_classification, Mass spectrometric, High-performance liquid chromatography, Analytical Chemistry, chemistry.chemical_compound, Complementary and alternative medicine, Serratula, chemistry, Drug Discovery, Molecular Medicine
Abstract

Six new ecdysteroids have been isolated from SERRATULA TINCTORIA; these are: the 2,22- and 3,22-diacetates of 20-hydroxyecdysone, 5beta-hydroxyrubrosterone, 3-epi-poststerone, 3-epi-rubrosterone, and 22-oxo-20-hydroxyecdysone. These minor compounds were found together with the known ecdysteroids, 20-hydroxyecdysone, its 2-, 3-, and 22-monoacetates, rubrosterone, poststerone, polypodine B (5beta,20-dihydroxyecdysone), pterosterone (25-deoxy-20,24-dihydroxyecdysone), and makisterone C (24-ethyl-20-hydroxyecdysone). All these ecdysteroids were isolated by a combination of several chromatographic techniques (liquid chromatography on alumina, DCCC, and HPLC), then identified using standard mass spectrometric and 2D (1)H-NMR techniques.

Published
1992

6. Notizen: A Novel Triterpenoid Isolated from the Roots of Glycyrrhiza echinata L

Author

Johannes Reisch, K. Szendrei, A. G. Hanna, Y. W. Mirhom, and M. H. A. Elgamal

Subjects
Triterpenoid, biology, Traditional medicine, Chemistry, Glycyrrhiza echinata, General Chemistry, biology.organism_classification
Abstract

3β,21 α-dihydroxy-oleane-11,13-dien-28-oic acid was isolated from the roots of Glycyrrhiza echinata L. and its structure was elucidated by spectral analysis.

Published
1990
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7. Ecdysteroids from Leuzea carthamoides

Author

I. Herke, Jean-Pierre Girault, K. Szendrei, René Lafont, E. Varga, and Zs. Hajdu

Subjects
Ajugasterone C, Polypodine B, Traditional medicine, Chemistry, Plant Science, General Medicine, Horticulture, Leuzea carthamoides, Molecular Biology, Biochemistry, Combinatorial chemistry
Abstract

20-Hydroxyecdysone, 24(28)-dehydromakisterone A, makisterone C, polypodine B, ajugasterone C, together with the two new phytoecdysteroids carthamosterone and 5-deoxykaladasterone, were isolated from the roots of Leuzea carthamoides . The herb yielded 20-hydroxyecdysone, 24(28)-dehydromakisterone A, makisterone C and carthamosterone.

Published
1988
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8. Über ein Flavanon mit isoprenoider C10-Seitenkette aus dem Samen von Amorpha fruticosa

Author

Johannes Reisch, Margit Gombos, István Novák, and K. Szendrei

Subjects
chemistry.chemical_compound, biology, chemistry, Drug Discovery, Amorpha fruticosa, Botany, Pharmaceutical Science, biology.organism_classification, Flavanone, Terpenoid
Abstract

Ein bisher unbekannter Inhaltsstoff der Samen von Amorpha fruticosa (Papilionaceae) konnte aufgrund seiner spektralen und chemischen Eigenschaften als 5, 7-Dihydroxy-6-geranyl-flavanon identifiziert werden. A Flavanone with an Isoprenoid C10-Side Chain Isolated from Amorpha Fruticosa Seeds A constituent of the seeds of Amorpha fruticosa, hitherto unknown. was identified as 5, 7-dihydroxy-6-geranyl flavanone, on the basis of its chemical and spectroscopic properties.

Published
1976
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12. Patents and literature

Author

Robert J. Linhardt, E. A. Balazs, D. J. Wedlock, G. O. Phillips, A. Leshchiner, R. S. Langer, R. J. Linhardt, C. L. Cooney, G. Fitzgerald, A. Grant, S. E. Lasker, J. C. Lormeau, J. Choay, J. Goulay, M. T. Goulay-Heir, M. A. Goulay-Heir, G. Goulay-Heir, M. Petitou, D. B. Soll, S. E. Harrison, L. L. Teng, A. G. Walton, R. V. Sparer, N. Ekwuribe, J. K. Borchardt, J. W. Bracke, K. Thacker, P. Brocklehurst, A. S. Ferguson, L. K. Gordon, H. Hayes, S. Inoue, H. Yamamoto, A. M. Nonomura, R. Pappo, J. M. Schweid, A. H. Cohee, A. F. Dec, L. K. Shay, S. E. Reiter, L. Turrisi, I. Umezawa, K. Komiyama, D. Williams, D. M. Munnecke, R. T. Zahradnik, K. Arizono, M. Terasawa, M. Nobutoki, L. C. A. Bergwitz, R. G. L. Osterlund, C. Brain, B. Johnston, L. G. Brooker, T. S. Chang, L. J. Zientek, A. Viniguaz, I. Chibata, T. Tosa, S. Takamatsu, D. F. Doehnert, A. S. Hill, D. P. Gaehring, J. V. Scanlon, G. D. Hansen, K. M. E. Hellsten, R. L. Horion, R. B. Kennedy, R. S. Kohn, A. J. Kruger, J. K. Johnson, W. Y. Kuu, V. K. Larsson, J. F. Mezzino, L. Y. Chuang, J. Michnowski, Y. Miyashiro, M. Ogawa, Y. Yamazaki, S. Igarasi, K. Morimoto, S. Nochumson, M. A. Pellico, R. J. Purinton, F. Reinhardt, K. Sakata, H. Imai, A. J. Sensabaugh, D. C. Crepps, W. Y. Rice, G. W. Fearrington, J. L. Shim, Y. Shimohiro, T. Ohnishi, E. Simon, H. Stuhler, E. Krempl, D. T. Su, K. Szendrei, E. Minker, Z. Re, L. Koch, L. Wolf, E. Szijj, M. Re, M. Trop, D. C. Tunc, T. Ueda, M. Vellini, R. B. Wallace, K. Watanabe, S. Yoshikawa, S. Futami, and R. H. Wunder

Subjects
chemistry.chemical_classification, Chemistry, Bioengineering, General Medicine, Computational biology, Polysaccharide, Molecular Biology, Applied Microbiology and Biotechnology, Biochemistry, Biotechnology
Published
1987
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13. Application of combined chromatographic techniques in the screening and purification of ecdysteroids

Author

K. Szendrei, Mária Báthori, and I. Herke

Subjects
animal structures, Chromatography, integumentary system, Chemistry, fungi, Organic Chemistry, Clinical Biochemistry, Biochemistry, humanities, hormones, hormone substitutes, and hormone antagonists, Thin-layer chromatography, Analytical Chemistry
Abstract

Plants were found to contain ecdysteroids in concentrations in the order of 0.1% which are higher than those of the insects, and are adequate for the preparative production of ecdysteroids.

Published
1986
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14. Acridone alkaloids of callus tissue ofRuta graveolens

Author

L. D. Kislov, K. Szendrei, Zs. Rozsa, I. N. Kuzovkina, and M. N. Zhivopistseva

Subjects
biology, Strain (chemistry), Ruta graveolens, Plant Science, General Chemistry, biology.organism_classification, General Biochemistry, Genetics and Molecular Biology, Acridone, chemistry.chemical_compound, chemistry, Dry weight, Rutacridone, Callus, Botany, heterocyclic compounds
Abstract

A strain of tissue of common rue of root origin (index of the strain R-4) has been obtained which produces up to 3% (of the dry weight) of acridone alkaloids. It has been shown by physicochemical methods that the combined alkaloids consist mainly of 1-hydroxy-N-methylacridone, rutacridone, and 1-hydroxy-3-methoxy N-methylacridone (0.28, 0.81, and 2.41 mg/g dry weight of tissue, respectively). Strain R-4 is a good model for the study of little-known steps in the biogenesis of the acridone alkaloids.

Published
1984
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16. UNTERSUCHUNG DER WIRKSTOFFE DER RUTA GRAVEOLENS II

Author

K. Szendrei, Buzás G, Koltai M, E. Minker, and I. Novák

Subjects
Pharmacology, Complementary and alternative medicine, Chemistry, Organic Chemistry, Drug Discovery, Pharmaceutical Science, Molecular Medicine, Analytical Chemistry
Published
1966
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21. ÜBER WEITERE C3–SUBSTITUIERTE CUMARIN–DERIVATE AUSRUTA GRAVEOLENS:DAPHNORETIN UND DAPHNORETIN–METHYLÄTHER1

Author

Johannes Reisch, E. Minker, I. Novák, and K. Szendrei

Subjects
Pharmacology, Complementary and alternative medicine, Organic Chemistry, Drug Discovery, Pharmaceutical Science, Molecular Medicine, Analytical Chemistry
Abstract

Die aus den oberirdischen Teilen von Ruta graveolens isolierten Substanzen Rn und R3 konnten durch die UV–, IR–, KMR– und Massenspektren als Daphnoretin und Daphnoretin–methylather identifiziert werden.

Published
1968
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22. UNTERSUCHUNG DER WIRKSTOFFE DERRUTA GRAVEOLENSI

Author

I. Novák, G. Buzás, E. Minker, M. Koltai, and K. Szendrei

Subjects
Pharmacology, Complementary and alternative medicine, Organic Chemistry, Drug Discovery, Pharmaceutical Science, Molecular Medicine, Analytical Chemistry
Published
1965
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24. ÜBER DIE CUMARINE DER WURZELN VONRUTA GRAVEOLENS

Author

K. Szendrei, Johannes Reisch, I. Novák, and E. Minker

Subjects
Pharmacology, Traditional medicine, biology, Chemistry, Ruta graveolens, Organic Chemistry, Pharmaceutical Science, Xanthyletin, biology.organism_classification, Analytical Chemistry, chemistry.chemical_compound, Complementary and alternative medicine, Angelicin, Drug Discovery, Molecular Medicine
Published
1969
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27. Thebaol, Bestandteil des Opiums

Author

Johannes Reisch, I. Novák, K. Szendrei, and M. Gombos

Subjects
Thebaine, Traditional medicine, Chemistry, Drug Discovery, medicine, Pharmaceutical Science, Opium, Morphinans, medicine.drug
Published
1974
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29. Indole Alkaloids of Ailanthus altissima

Author

E. Varga, Johannes Reisch, K. Szendrei, and G. Maróti

Subjects
Pharmacology, Indole test, Ailanthus altissima, Plant composition, Organic Chemistry, Pharmaceutical Science, Biology, biology.organism_classification, Analytical Chemistry, Complementary and alternative medicine, Drug Discovery, Canthin-6-one, Botany, Ornamental plant, Molecular Medicine, Simaroubaceae, Medicinal plants, Woody plant
Published
1980
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30. Ecdysteroids in Spinacia oleracea and Chenopodium bonus-henricus

Author

K. Szendrei, Johannes Reisch, M. Báthory, and I. Tóth

Subjects
Spinacia, Polypodine B, biology, Chenopodium bonus-henricus, Chenopodium, Plant Science, General Medicine, Horticulture, biology.organism_classification, Biochemistry, chemistry.chemical_compound, chemistry, Botany, Chenopodiaceae, Molecular Biology, Ecdysone
Abstract

The roots of Chenopodium bonus-henricus and the seeds of Spinacia oleracea contain 20-hydroxyecdysone and polypodine B. The seeds of S. oleracea also contain a compound with properties similar to those of 24(28)-dehydromakisterone-A and may contain small amounts of ecdysone.

Published
1982
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31. New alkaloids from Haplophyllum glabrium

Author

Zs. Rózsa, M. Rábik, K. Szendrei, István Pelczer, and M. Aynechi

Subjects
Rutaceae, biology, Stereochemistry, Chemistry, Proton NMR, Plant Science, General Medicine, Horticulture, biology.organism_classification, Spectroscopy, Molecular Biology, Biochemistry
Abstract

Four furoquinoline alkaloids have been characterized from the roots of Haplophyllum glabrinum of which three are new compounds. Their structures were determined by spectroscopic methods, including 1 H NMR NOE difference spectroscopy.

Published
1988
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32. Dihydroperfamine, an alkaloid from haplophyllum glabrinum

Author

M. Rábik, Zs. Rózsa, István Pelczer, Gy. Argay, Johannes Reisch, L. Mester, M. Aynechi, Alajos Kálmán, and K. Szendrei

Subjects
Lignan, biology, Stereochemistry, Alkaloid, Plant Science, General Medicine, Horticulture, Coumarin, biology.organism_classification, Biochemistry, chemistry.chemical_compound, Rutaceae, chemistry, Molecular Biology
Abstract

A new tetrabydrofuroquinoline alkaloid has been characterized from the roots of Haplophyllum glabrinum besides known alkaloids, coumarin and lignan derivatives. Its molecular structure was established by X-ray analysis.

Published
1986
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47. ChemInform Abstract: STUDIES IN NATURAL PRODUCT CHEMISTRY. 72. DIMERIC QUINOLONE ALKALOIDS FROM THE ROOT BARK OF PTELEA TRIFOLIATA - STRUCTURE OF PTELEDIMERIDINE

Author

K. Szendrei, I. Mester, J. Koeroesi, and Johannes Reisch

Subjects
Natural product, biology, medicine.drug_class, General Medicine, Quinolone, biology.organism_classification, chemistry.chemical_compound, Ptelea trifoliata, chemistry, visual_art, medicine, visual_art.visual_art_medium, Organic chemistry, Bark
Published
1980
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