Startseite Spectrometric pK Determination of Daphnetin, Chlorogenic Acid and Quercetin
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Spectrometric pK Determination of Daphnetin, Chlorogenic Acid and Quercetin

  • N. Sauerwald , M. Schwenk , J. Polster und E. Bengsch
Veröffentlicht/Copyright: 2. Juni 2014
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Zeitschrift für Naturforschung B
Aus der Zeitschrift Zeitschrift für Naturforschung B Band 53 Heft 3

Abstract

Daphnetin, Chlorogenic Acid, Quercetin Polyphenols play an important role in the ‘immune system’ of plants. Since their charge is important for their physiological effect it is important to know their pKj values. Therefore, the pKj values of some plant contents such as daphnetin (pK = 7.36), chlorogenic acid (pK ≈ 8.5), and quercetin (pK1 = 7.03, pfro = 9.15) were determined in the pH range 7 -10 using UV/VIS spectroscopy. The decomposition kinetics of quercetin in alkaline solutions was taken into consideration by extrapolating the absorbance time curves to time zero (t = 0). The graphic method of absorbance (A) diagrams was used to determine the pKi values. In the case of quercetin the method of linear regression was also used for the determination.

Keywords: Daphnetin; Chlorogenic Acid; Quercetin
Received: 1997-9-15
Published Online: 2014-6-2
Published in Print: 1998-3-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

Artikel in diesem Heft

  1. Enantioselective Catalysis, XVII [1]. Enantioselective Catalytic Hydrogenation of Unfunctionalized Ketones
  2. Isoselenocyanatoborate -Kristallstrukturen von (n-Bu4N)[BH(NCSe)3] und (Ph4P)[B3H7(NCSe)] / Isoselenocyanatoborates -Crystal Structures of (n-Bu4N)[BH(NCSe)3] and (Ph4P)[B3H7(NCSe)]
  3. Redoxreaktionen von Molybdänverbindungen mit Bis(2-salicyliden- aniinophenvl Klisulfid. Kristallstruktur von Salicylaldehyd-2-mercapto- anilato(2-)-triphenylphosphanoxid-dioxomolybdän(VI) Redox / Reactions of Molybdenum Compounds with Bis(2-salicylidene-aminophenyl)disulfide. Crystal Structure of Salicylaldehyde-2-mercaptoanilato(2-)– triphenylphosphaneoxide-dioxo- molybdenum(VI)
  4. Ag+ als Substituent eines Alkalimetalls in Ag2SrMnV2O8 / Ag+ As Substituent Of An Alkaline Metal In Ag2SrMnV2O8
  5. Isolierte trigonale SrO6 – Prismen verknüpfen Kagome-Netze im Strontium-Manganat(IV)-Tellurat(VI): SrMnTeO6 / Kagomé Layers Connected by Isolated Trigonal SrO6 Prisms in the Strontium Manganate(IV) Tellurate(VI): SrMnTeO6 L
  6. Isolierte 1∞[TeO5]-Oktaederketten im Bleitellurat Pb2TeO5 / Isolated 1∞[TeO5] Chains of Octahedra in the Lead Tellurate Pb2TeO5
  7. Zur Kristallchemie der Silber-Mangan-Oxovanadate Ag2BaMnV2O8 und (AgCa2)Mn2(VO4)3 / On the Crystal Chemistry of the Silver Manganese Oxovanadates Ag2BaMnV2O8 and (AgCa2)Mn2(VO4)3
  8. Zur Synthese fluororganischer O-(Trimethylsilyl)-cyanhydrine / Synthesis of Fluoroorganic O-(Trimethylsilyl)Cyanhydrines
  9. Synthesis and Reactions with CO and C2H4 of Cobalt(I) Complexes Containing Trimethylphosphine and Chelating o-Diphenylphosphanyl- phenolate Ligands
  10. Spectrometric pK Determination of Daphnetin, Chlorogenic Acid and Quercetin
  11. Bonding in an Unusual Nickel Carbide
  12. Supersilylverbindungen Der Borgruppenelemente, IV [1]. Supersilylelementhalogenide tBu3SIEX2 Und (tBu3Si)2Ex Mit E = Al, Ga, In: Synthesen, Eigenschaften, Strukturen [2] / Supersilylated Compounds of the Thirteenth Group, IV [I]. Supersilylelement Halides tBu3SIEX2 And (tBu3Si)2Ex with E = Al, Ga, In: Syntheses, Properties, Structures [2]
  13. Solventothermal Synthesis of the Lamellar Selenidostannates(IV) A2Sn4Se9 · H2O (A = Rb, Cs) and Cs2Sn2Se6
  14. Cyclodisilazane in cis-Konformation -eine einfache Synthese / Cyclodisilazanes in cis Conformation -a Facile Synthesis
  15. Untersuchungen zum chemischen Transport von YX3 mit AlX3 und zur Existenz von gasförmigen und festen Komplexen YAl3 X12 (X = Br, I) / Investigations on the Chemical Transport Reaction of YX3 with AlX3 and on the Existence of Gaseous and Solid Complexes YAl3 X12 (X = Br, I) H
  16. Synthesis and Mesomorphic Properties of Polymethylene-α,ω–bis [2-thio- 5-(4',4"n-alcoxybenzoyIoxy)phenyl]-1,3,4-oxadiazole
  17. Syntheses and Structures of Cyclopentadienyl Arsenic (III) Compounds Part IIIa: Tetraisopropylcyclopentadienyl Arsenic (III) Dibromide and Tetraisopropyl- cyclopentadienyl Arsenic (III) Diiodide (TipCpAsBr2, TipCpAsI2)
  18. Kristallstruktur von [Mo(Co)3(Ncme)(Srbu)]2 / Crystal Structure of [Mo(CO)3(NCMe)(S'Bu)]2
  19. The Molecular Structures and Conformational Preferences of Bis(dimethylstibyl)-Sulfane and -Tellurane, E(SbMe2)2, E = S or Te, Me = CH3, by Density Functional Theory Calculations and Gas Electron Diffraction
  20. Experimental and Computational Studies on Aminoguanidine Free Base, Monocation and Dication. Part III: Proton Affinities of Guanidine, Aminoguanidine and Glyoxal Bis(amidinohydrazone)
  21. Reaction of 9-Borabicyclo[3.3.1]nonane with N-Trimethylsilylamines – Cleavage of the N–Si or N–H Bond
https://doi.org/10.1515/znb-1998-0310
Schlagwörter für diesen Artikel
Daphnetin; Chlorogenic Acid; Quercetin

Artikel in diesem Heft

  1. Enantioselective Catalysis, XVII [1]. Enantioselective Catalytic Hydrogenation of Unfunctionalized Ketones
  2. Isoselenocyanatoborate -Kristallstrukturen von (n-Bu4N)[BH(NCSe)3] und (Ph4P)[B3H7(NCSe)] / Isoselenocyanatoborates -Crystal Structures of (n-Bu4N)[BH(NCSe)3] and (Ph4P)[B3H7(NCSe)]
  3. Redoxreaktionen von Molybdänverbindungen mit Bis(2-salicyliden- aniinophenvl Klisulfid. Kristallstruktur von Salicylaldehyd-2-mercapto- anilato(2-)-triphenylphosphanoxid-dioxomolybdän(VI) Redox / Reactions of Molybdenum Compounds with Bis(2-salicylidene-aminophenyl)disulfide. Crystal Structure of Salicylaldehyde-2-mercaptoanilato(2-)– triphenylphosphaneoxide-dioxo- molybdenum(VI)
  4. Ag+ als Substituent eines Alkalimetalls in Ag2SrMnV2O8 / Ag+ As Substituent Of An Alkaline Metal In Ag2SrMnV2O8
  5. Isolierte trigonale SrO6 – Prismen verknüpfen Kagome-Netze im Strontium-Manganat(IV)-Tellurat(VI): SrMnTeO6 / Kagomé Layers Connected by Isolated Trigonal SrO6 Prisms in the Strontium Manganate(IV) Tellurate(VI): SrMnTeO6 L
  6. Isolierte 1∞[TeO5]-Oktaederketten im Bleitellurat Pb2TeO5 / Isolated 1∞[TeO5] Chains of Octahedra in the Lead Tellurate Pb2TeO5
  7. Zur Kristallchemie der Silber-Mangan-Oxovanadate Ag2BaMnV2O8 und (AgCa2)Mn2(VO4)3 / On the Crystal Chemistry of the Silver Manganese Oxovanadates Ag2BaMnV2O8 and (AgCa2)Mn2(VO4)3
  8. Zur Synthese fluororganischer O-(Trimethylsilyl)-cyanhydrine / Synthesis of Fluoroorganic O-(Trimethylsilyl)Cyanhydrines
  9. Synthesis and Reactions with CO and C2H4 of Cobalt(I) Complexes Containing Trimethylphosphine and Chelating o-Diphenylphosphanyl- phenolate Ligands
  10. Spectrometric pK Determination of Daphnetin, Chlorogenic Acid and Quercetin
  11. Bonding in an Unusual Nickel Carbide
  12. Supersilylverbindungen Der Borgruppenelemente, IV [1]. Supersilylelementhalogenide tBu3SIEX2 Und (tBu3Si)2Ex Mit E = Al, Ga, In: Synthesen, Eigenschaften, Strukturen [2] / Supersilylated Compounds of the Thirteenth Group, IV [I]. Supersilylelement Halides tBu3SIEX2 And (tBu3Si)2Ex with E = Al, Ga, In: Syntheses, Properties, Structures [2]
  13. Solventothermal Synthesis of the Lamellar Selenidostannates(IV) A2Sn4Se9 · H2O (A = Rb, Cs) and Cs2Sn2Se6
  14. Cyclodisilazane in cis-Konformation -eine einfache Synthese / Cyclodisilazanes in cis Conformation -a Facile Synthesis
  15. Untersuchungen zum chemischen Transport von YX3 mit AlX3 und zur Existenz von gasförmigen und festen Komplexen YAl3 X12 (X = Br, I) / Investigations on the Chemical Transport Reaction of YX3 with AlX3 and on the Existence of Gaseous and Solid Complexes YAl3 X12 (X = Br, I) H
  16. Synthesis and Mesomorphic Properties of Polymethylene-α,ω–bis [2-thio- 5-(4',4"n-alcoxybenzoyIoxy)phenyl]-1,3,4-oxadiazole
  17. Syntheses and Structures of Cyclopentadienyl Arsenic (III) Compounds Part IIIa: Tetraisopropylcyclopentadienyl Arsenic (III) Dibromide and Tetraisopropyl- cyclopentadienyl Arsenic (III) Diiodide (TipCpAsBr2, TipCpAsI2)
  18. Kristallstruktur von [Mo(Co)3(Ncme)(Srbu)]2 / Crystal Structure of [Mo(CO)3(NCMe)(S'Bu)]2
  19. The Molecular Structures and Conformational Preferences of Bis(dimethylstibyl)-Sulfane and -Tellurane, E(SbMe2)2, E = S or Te, Me = CH3, by Density Functional Theory Calculations and Gas Electron Diffraction
  20. Experimental and Computational Studies on Aminoguanidine Free Base, Monocation and Dication. Part III: Proton Affinities of Guanidine, Aminoguanidine and Glyoxal Bis(amidinohydrazone)
  21. Reaction of 9-Borabicyclo[3.3.1]nonane with N-Trimethylsilylamines – Cleavage of the N–Si or N–H Bond
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