References of "Poukens-Renwart, Pascale"
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See detailDensitometric Evaluation of Gentiopicroside in the Roots of Gentiana lutea L.
Bodart, Patricia; Poukens-Renwart, Pascale; Wauters, Jean-Noël ULiege et al

in Journal of Planar Chromatography- Modern TLC (1996), 9(March/April), 143-145

As no satisfactory method existed for the separation of gentiopicroside from other components of gentian roots, we have decided to undertake some experiments.In this communication, we report the use of a ... [more ▼]

As no satisfactory method existed for the separation of gentiopicroside from other components of gentian roots, we have decided to undertake some experiments.In this communication, we report the use of a novel mobile phase and a different detection system. Our HPTLC method is a fast and reliable procedure which may be used for quantification of gentiopicroside in roots and extracts of Gentiana lutea, whether for routine analysis or for studying stability. The TLC method is also compared with an HPLC method. [less ▲]

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See detailQuantitative Densitometric Evaluation of Harpagoside in the Secondary Roots of Harpagophytum procumbens D.C.
Poukens-Renwart, Pascale; Tits, Monique ULiege; Angenot, Luc ULiege

in Journal of Planar Chromatography- Modern TLC (1996), 9(May/June), 199-202

Harpagophytum procumbens D.C. (Devil's Claw) secondary roots are used in Europe as a home remedy for lack of appetite, dyspeptic complaints, and in supportive therapy for degenerative disorders of the ... [more ▼]

Harpagophytum procumbens D.C. (Devil's Claw) secondary roots are used in Europe as a home remedy for lack of appetite, dyspeptic complaints, and in supportive therapy for degenerative disorders of the locomotor system. The main characteristic iridoid glucoside of the plant is harapagoside. An HPTLC method has been developed for the quantitative determination of harpagoside in the secondary roots and extracts of this plant. The mobile phase used is an optimized version of one described in the literature.It furnished the most homogenous spots for quantitative densitometric evaluation ( at lambda= 286 nm, the wavelenght of maximum absorption for harapgoside).The results have been compared with those obtained afetr visualization with sulfuric acid-vanillin reagent and those obtained using a previously published HPLC method; To check that separation was complete, the spectra of harpagoside obtained from Devil's Claw extracts before and after visualization were superimposed on thos of harpagoside standard. [less ▲]

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See detailSemi-Quantitative Salicin Analysis According the German Pharmacopoeia (DABX): Avoidance of Picein Interference
Poukens-Renwart, Pascale; Tits, Monique ULiege; Angenot, Luc ULiege

in Planta Medica (1993), 59(Supplement Issue), 629-630

The semi-quantitative determination of salicin by TLC described in the German Pharmacopoeia (DABX) does not separate salicin from picein, another phenolic glycoside of some willow species. In this paper ... [more ▼]

The semi-quantitative determination of salicin by TLC described in the German Pharmacopoeia (DABX) does not separate salicin from picein, another phenolic glycoside of some willow species. In this paper we propose to combine the use of both an adequate mobile phase and a suitable reagent (vanillin reagent instead of sulfuric acid-thymol) for an unambiguous determination of the amount of salicin.. [less ▲]

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See detailDensitometric Determination of Salicin in Willow Stem Bark
Poukens-Renwart, Pascale; Tits, Monique ULiege; Angenot, Luc ULiege

in Journal of Planar Chromatography (1993), 6(november-december), 434-437

Most of the salicin present in willow stem bark occurs as labile glycosides (e.g. salicin, salicortin, 2-O'-acetylsalicortin, 3-O'-acetylsalicortin, tremulacin and fragilin). On alkaline hydrolysis, these ... [more ▼]

Most of the salicin present in willow stem bark occurs as labile glycosides (e.g. salicin, salicortin, 2-O'-acetylsalicortin, 3-O'-acetylsalicortin, tremulacin and fragilin). On alkaline hydrolysis, these acylated derivatives decompose to salicin; in this way, the total amount of salicin can be determined. A HPTLC method has been developed for the quantitative determination of salicin in stem bark before and after alkaline hydrolysis. The mobile phase used for the separation is a modification of one described in the literature. a double or triple migration is necessary to separate salicin from other components of the extract. The results have been compared with those obtained after bidimensional chromatography using two phases described for the quantitative evaluation of salicin. to check that separation was complete, the spectrum of salicin obtained from willow extracts was superimposed on that of a salicin standard.Quantification was performed at lambda = 270nm, the wavelenght of maximum absorption in the IV spectrum of salicin. [less ▲]

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See detailDensitometric evaluation of spiraeoside after derivatization in flowers of Filipendula ulmaria (L.) Maxim.
Poukens-Renwart, Pascale; Tits, Monique ULiege; Wauters, Jean-Noël ULiege et al

Poster (1992, September)

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See detailDensitometric evaluation of fraxin in leaves of Fraxinus excelsior
Poukens-Renwart, Pascale; Tits, Monique ULiege; Wauters, Jean-Noël ULiege et al

Poster (1992, May)

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See detailDensitometric Evaluation of fraxin in leaves of Fraxinus excelsior
Poukens-Renwart, Pascale; Tits, Monique ULiege; Wauters, Jean-Noël ULiege et al

in Journal de Pharmacie de Belgique (1992), 47(3), 241

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See detailDensitometric evaluation of spiraeoside in Filipendula ulmaria flowers after derivatization
Poukens-Renwart, Pascale; Tits, Monique ULiege; Wauters, Jean-Noël ULiege et al

Poster (1992)

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See detailA Densitometric Method for the Determination of Three Clinically Important Monosaccharides in Urine
Poukens-Renwart, Pascale; Angenot, Luc ULiege

in Journal of Planar Chromatography (1991), 4(January/February), 77-79

A quantitative, densitometric, thin layer chromatographic method has been developed for the determination of three clinically important monosaccharides in ureine, after desalting.The analysis of these ... [more ▼]

A quantitative, densitometric, thin layer chromatographic method has been developed for the determination of three clinically important monosaccharides in ureine, after desalting.The analysis of these monosaccharides in urine allows to observe the potential changes induced by antiinflammatories in human small intestine permeability. Xylose, 3-O-methylglucose and rhamnose were estimated quantitatively in urine; arabinose was used as internal standard. The densitometry was performed at a wavelenght of 400 nm after a visualization reaction on HPTLC plates. In all cases, coefficients of variation of the method were less than 2.7%. [less ▲]

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See detailConcerning the standardization of Fabiana imbricata
Poukens-Renwart, Pascale; Angenot, Luc ULiege

in Planta Medica (1990, December), 56(6), 595

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See detailAbout the standardization of fabiana imbricata
Poukens-Renwart, Pascale; Angenot, Luc ULiege

in Journal de Pharmacie de Belgique (1990), 45(6), 390

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See detailAn indolinic cryptoalkaloid from Strychnos mattogrossensis
Angenot, Luc ULiege; Belem-Pinheiro, Maria-Lucia; Imbiriba da Rocha, Arnaldo et al

in Phytochemistry (1990), 29(8), 2746-2749

A new indolinic cryptoalkaloid, mattogrossine, has een isolated from the roots and branches of Strychnos mattogrossensis collected near Manaus. Elucidation of its structure is based mainly on 2D NMR ... [more ▼]

A new indolinic cryptoalkaloid, mattogrossine, has een isolated from the roots and branches of Strychnos mattogrossensis collected near Manaus. Elucidation of its structure is based mainly on 2D NMR studies. Two other indolinic alkaloids were also obtained: strychnobrasiline and 12-hydroxy-11-methoxystrychnobrasiline, and their 13C NMR data are provided [less ▲]

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