Spectrometric pK determination of daphnetin, chlorogenic acid and quercetin

N. Sauerwald; M. Schwenk; J. Polster; E. Bengsch

doi:10.1515/znb-1998-0310

Spectrometric pK determination of daphnetin, chlorogenic acid and quercetin

N. Sauerwald, M. Schwenk, J. Polster, E. Bengsch

Life Sciences

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

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 pK_i values. Therefore, the pK_i values of some plant contents such as daphnetin (pK = 7.36), chlorogenic acid (pK ≈ 8.5), and quercetin (pK₁ = 7.03, pK₂ = 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 (l = 0). The graphic method of absorbance (A) diagrams was used to determine the pK_i values. In the case of quercetin the method of linear regression was also used for the determination.

Original language	English
Pages (from-to)	315-321
Number of pages	7
Journal	Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume	53
Issue number	3
DOIs	https://doi.org/10.1515/znb-1998-0310
State	Published - Mar 1998

Keywords

Chlorogenic acid
Daphnetin
Quercetin.

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10.1515/znb-1998-0310

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title = "Spectrometric pK determination of daphnetin, chlorogenic acid and quercetin",

abstract = "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 pKi values. Therefore, the pKi values of some plant contents such as daphnetin (pK = 7.36), chlorogenic acid (pK ≈ 8.5), and quercetin (pK1 = 7.03, pK2 = 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 (l = 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 = "Chlorogenic acid, Daphnetin, Quercetin.",

author = "N. Sauerwald and M. Schwenk and J. Polster and E. Bengsch",

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T1 - Spectrometric pK determination of daphnetin, chlorogenic acid and quercetin

AU - Sauerwald, N.

AU - Schwenk, M.

AU - Polster, J.

AU - Bengsch, E.

PY - 1998/3

Y1 - 1998/3

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AB - 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 pKi values. Therefore, the pKi values of some plant contents such as daphnetin (pK = 7.36), chlorogenic acid (pK ≈ 8.5), and quercetin (pK1 = 7.03, pK2 = 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 (l = 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.

KW - Chlorogenic acid

KW - Daphnetin

KW - Quercetin.

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Spectrometric pK determination of daphnetin, chlorogenic acid and quercetin

Abstract

Keywords

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