A. de Villiers

发表

Toward automated chromatographic fingerprinting: A non-alignment approach to gas chromatography mass spectrometry data.

G. de Revel, M. du Toit, D. Rauhut, 2016, Analytica chimica acta.

Recent advances and trends in the liquid-chromatography-mass spectrometry analysis of flavonoids.

Harald Pasch, André de Villiers, Pieter Venter, 2016, Journal of chromatography. A.

Comprehensive two-dimensional temperature-responsive × reversed phase liquid chromatography for the analysis of wine phenolics.

Elena Bandini, F. Lynen, G. Desmet, 2022, Talanta.

Recent applications of ion mobility spectrometry in natural product research.

M. Stander, A. de Villiers, Keabetswe Masike, 2020, Journal of pharmaceutical and biomedical analysis.

Comprehensive off-line CCC × LC-DAD-MS separation of Cyclopia pubescens Eckl. & Zeyh. phenolic compounds and structural elucidation of isolated compounds.

M. Hamburger, A. de Villiers, Nico A. Walters, 2020, Phytochemical analysis : PCA.

Application of Kinetically Optimised Online HILIC × RP-LC Methods Hyphenated to High Resolution MS for the Analysis of Natural Phenolics

A. de Villiers, Magriet Muller, A. Tredoux, 2018, Chromatographia.

Phenolic profiling of rooibos using off-line comprehensive normal phase countercurrent chromatography×reversed phase liquid chromatography.

A. de Villiers, Nico A. Walters, D. de Beer, 2017, Journal of chromatography. A.

Influence of frictional heating on temperature gradients in ultra-high-pressure liquid chromatography on 2.1mm I.D. columns.

P. Sandra, R. Szucs, A. de Villiers, 2006, Journal of chromatography. A.

High efficiency liquid chromatography on conventional columns and instrumentation by using temperature as a variable. Kinetic plots and experimental verification.

F. Lestremau, P. Sandra, R. Szucs, 2007, Journal of chromatography. A.

Method to predict and compare the influence of the particle size on the isocratic peak capacity of high-performance liquid chromatography columns.

D. Clicq, P. Sandra, R. Szucs, 2007, Journal of chromatography. A.

Off-line comprehensive 2-dimensional hydrophilic interaction x reversed phase liquid chromatography analysis of procyanidins.

A. de Villiers, Kathithileni M. Kalili, 2009, Journal of chromatography. A.

Effect of analyte properties on the kinetic performance of liquid chromatographic separations.

P. Sandra, F. Lynen, A. de Villiers, 2009, Journal of chromatography. A.

High performance liquid chromatography analysis of wine anthocyanins revisited: effect of particle size and temperature.

P. Sandra, F. Lynen, G. Desmet, 2009, Journal of chromatography. A.

Off-line comprehensive two-dimensional hydrophilic interaction x reversed phase liquid chromatographic analysis of green tea phenolics.

A. de Villiers, Kathithileni M. Kalili, 2010, Journal of separation science.

High-efficiency high performance liquid chromatographic analysis of red wine anthocyanins.

P. Sandra, F. Lynen, G. Desmet, 2011, Journal of chromatography. A.

Recent developments in the HPLC separation of phenolic compounds.

André de Villiers, A. de Villiers, Kathithileni M. Kalili, 2011, Journal of separation science.

Fast method development of rooibos tea phenolics using a variable column length strategy.

G. Desmet, D. Cabooter, A. de Villiers, 2011, Journal of chromatography. A.

Kinetic optimisation of the reversed phase liquid chromatographic separation of rooibos tea (Aspalathus linearis) phenolics on conventional high performance liquid chromatographic instrumentation.

A. de Villiers, D. de Beer, E. Joubert, 2012, Journal of chromatography. A.

Kinetic optimisation of the reversed phase liquid chromatographic separation of proanthocyanidins on sub-2 μm and superficially porous phases.

G. Desmet, D. Cabooter, A. de Villiers, 2012, Journal of chromatography. A.

Comprehensive two-dimensional liquid chromatographic analysis of rooibos (Aspalathus linearis) phenolics.

A. de Villiers, D. de Beer, E. Joubert, 2012, Journal of separation science.

Variation in phenolic content and antioxidant activity of fermented rooibos herbal tea infusions: role of production season and quality grade.

A. de Villiers, D. de Beer, E. Joubert, 2012, Journal of agricultural and food chemistry.

Advanced ultra high pressure liquid chromatography-tandem mass spectrometric methods for the screening of red wine anthocyanins and derived pigments.

M. Stander, A. de Villiers, P. Alberts, 2012, Journal of chromatography. A.

Hydrophilic interaction chromatographic analysis of anthocyanins.

Chandre M. Willemse, M. Stander, A. de Villiers, 2013, Journal of chromatography. A.

Systematic optimisation and evaluation of on-line, off-line and stop-flow comprehensive hydrophilic interaction chromatography×reversed phase liquid chromatographic analysis of procyanidins. Part II: application to cocoa procyanidins.

A. de Villiers, Kathithileni M. Kalili, 2013, Journal of chromatography. A.

Toward unraveling grape tannin composition: application of online hydrophilic interaction chromatography × reversed-phase liquid chromatography-time-of-flight mass spectrometry for grape seed analysis.

M. Stander, Jochen Vestner, A. de Villiers, 2013, Analytical chemistry.

Comprehensive two-dimensional liquid chromatographic analysis of anthocyanins.

Chandre M. Willemse, M. Stander, A. de Villiers, 2014, Journal of chromatography. A.

Chemometric analysis of chromatographic fingerprints shows potential of Cyclopia maculata (Andrews) Kies for production of standardized extracts with high xanthone content.

M. Manley, A. de Villiers, D. de Beer, 2014, Journal of agricultural and food chemistry.

Improving the universal response of evaporative light scattering detection by mobile phase compensation.

P. Sandra, R. Szucs, F. Lynen, 2007, Journal of chromatography. A.

Comprehensive two-dimensional gas chromatography for the analysis of synthetic and crude-derived jet fuels.

P. Sandra, J. Beens, A. de Villiers, 2011, Journal of chromatography. A.

Fractionation by liquid chromatography combined with comprehensive two-dimensional gas chromatography-mass spectrometry for analysis of cyclics in oligomerisation products of Fischer-Tropsch derived light alkenes.

P. Sandra, N. Prinsloo, A. de Villiers, 2011, Journal of chromatography. A.

Comprehensive two-dimensional gas chromatography for the analysis of Fischer-Tropsch oil products.

P. Sandra, A. de Villiers, R. van der Westhuizen, 2010, Journal of chromatography. A.

he Impact of Different Tannin to Anthocyanin Ratios and of Oxygen on the Phenolic Polymerisation Over Time in a Wine-like Solution

G. Garrido-Bañuelos, A. de Villiers, A. Buica, 2019, South African Journal of Enology and Viticulture.

Considerations on the possibilities and limitations of comprehensive normal phase-reversed phase liquid chromatography (NPLC x RPLC).

P. Sandra, Isabelle François, A. de Villiers, 2006, Journal of separation science.

Comprehensive analysis of chestnut tannins by reversed phase and hydrophilic interaction chromatography coupled to ion mobility and high resolution mass spectrometry.

H. Pasch, A. de Villiers, Pieter B Venter, 2019, Analytica chimica acta.

Parallel gradients in comprehensive multidimensional liquid chromatography enhance utilization of the separation space and the degree of orthogonality when the separation mechanisms are correlated.

T. Górecki, A. de Villiers, Magriet Muller, 2020, Journal of chromatography. A.

Predictive kinetic optimisation of hydrophilic interaction chromatography × reversed phase liquid chromatography separations: Experimental verification and application to phenolic analysis.

A. de Villiers, Magriet Muller, A. Tredoux, 2018, Journal of chromatography. A.

Comprehensive Three-Dimensional LC × LC × Ion Mobility Spectrometry Separation Combined with High-Resolution MS for the Analysis of Complex Samples.

M. Stander, H. Pasch, Jochen Vestner, 2018, Analytical chemistry.

Development of a Solid-Phase Extraction Procedure for the Simultaneous Determination of Polyphenols, Organic Acids and Sugars in Wine

F. Lynen, P. Sandra, A. de Villiers, 2004 .

Application of direct injection-ion mobility spectrometry-mass spectrometry (DI-IMS-MS) for the analysis of phenolics in honeybush and rooibos tea samples

M. Stander, A. de Villiers, Keabetswe Masike, 2021, Journal of Food Composition and Analysis.

Food Ingredient Extracts of Cyclopia subternata (Honeybush): Variation in Phenolic Composition and Antioxidant Capacity

M. Stander, A. de Villiers, D. de Beer, 2012, Molecules.

Are invasive populations characterized by a broader diet than native populations?

A. Herrel, R. Rebelo, T. Backeljau, 2017, PeerJ.

Investigation of the validity of the kinetic plot method to predict the performance of coupled column systems operated at very high pressures under different thermal conditions.

F. Lestremau, P. Sandra, F. Lynen, 2009, Journal of chromatography. A.

Application of metabolomics tools to determine possible biomarker metabolites linked to leaf blackening in Protea.

M. Stander, A. de Villiers, Keabetswe Masike, 2020, Journal of agricultural and food chemistry.

Genotypic variation in phenolic composition of Cyclopia pubescens (honeybush tea) seedling plants

B. Walczak, A. de Villiers, Nico A. Walters, 2019, Journal of Food Composition and Analysis.

Ultra-high pressure liquid chromatography coupled to travelling wave ion mobility-time of flight mass spectrometry for the screening of pharmaceutical metabolites in wastewater samples: Application to antiretrovirals.

M. Stander, A. de Villiers, T. Mosekiemang, 2021, Journal of chromatography. A.

Simultaneous quantification of commonly prescribed antiretroviral drugs and their selected metabolites in aqueous environmental samples by direct injection and solid phase extraction liquid chromatography - tandem mass spectrometry.

M. Stander, A. de Villiers, T. Mosekiemang, 2019, Chemosphere.

Speeding up temperature-responsive × reversed-phase comprehensive liquid chromatography through the combined exploitation of temperature and flow rate gradients.

F. Lynen, G. Desmet, A. de Villiers, 2022, Journal of chromatography. A.

Enhancing the Possibilities of Comprehensive Two-Dimensional Liquid Chromatography through Hyphenation of Purely Aqueous Temperature-Responsive and Reversed-Phase Liquid Chromatography.

F. Lynen, G. Desmet, A. de Villiers, 2018, Analytical chemistry.

Evaluation of ultra performance liquid chromatography. Part I. Possibilities and limitations.

Roman Szucs, François Lestremau, Frank David, 2006, Journal of chromatography. A.

Detailed phenolic characterization of Protea pure and hybrid cultivars by liquid chromatography-ion mobility-high resolution mass spectrometry (LC-IM-HR-MS).

M. Stander, A. de Villiers, Keabetswe Masike, 2019, Journal of agricultural and food chemistry.

Solid phase extraction in combination with comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry for the detailed investigation of volatiles in South African red wines.

Tadeusz Górecki, B. T. Weldegergis, T. Górecki, 2011, Analytica chimica acta.

A. de Villiers, Kathithileni M. Kalili, 2013, Journal of chromatography. A.

Shelf-Life Stability of Ready-to-Use Green Rooibos Iced Tea Powder—Assessment of Physical, Chemical, and Sensory Properties

M. Muller, M. Aucamp, A. de Villiers, 2021, Molecules.

Comprehensive analysis of tara tannins by reversed-phase and hydrophilic interaction chromatography coupled to ion mobility and high-resolution mass spectrometry

H. Pasch, A. de Villiers, Pieter B Venter, 2019, Analytical and Bioanalytical Chemistry.

Alkaloids from the Amaryllidaceae Crinum variabile - including a full house of lycorine and its acylated derivatives

I. Green, W. V. van Otterlo, A. de Villiers, 2022, South African Journal of Botany.

Detailed qualitative analysis of honeybush tea (Cyclopia spp.) volatiles by comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry and relation with sensory data.

M. Muller, A. de Villiers, E. Joubert, 2017, Journal of chromatography. A.

A detailed evaluation of the advantages and limitations of online RP-LC×HILIC compared to HILIC×RP-LC for phenolic analysis.

A. de Villiers, Magriet Muller, 2023, Journal of chromatography. A.

New dihydroxycucurbitacin D's from the Namib desert endemic plant Acanthosicyos horridus (!nara).

Nonkululeko Mkwanazi, G. Dziwornu, A. de Villiers, 2021, Fitoterapia.

Analytical techniques for wine analysis: an African perspective; a review.

André de Villiers, A. de Villiers, A. Tredoux, 2012, Analytica chimica acta.

Combined size exclusion chromatography, supercritical fluid chromatography and electrospray ionization mass spectrometry for the analysis of complex aliphatic polyesters.

Chandre M. Willemse, H. Pasch, A. de Villiers, 2014, Journal of chromatography. A.

Comprehensive two-dimensional liquid chromatography applying two parallel columns in the second dimension.

P. Sandra, F. David, Isabelle François, 2008, Journal of chromatography. A.

Deciphering the chemical instability of sphaeropsidin A under physiological conditions - degradation studies and structural elucidation of the major metabolite.

W. Berger, K. Gustafson, A. Kornienko, 2020, Organic & biomolecular chemistry.

Investigation of the volatile composition of pinotage wines fermented with different malolactic starter cultures using comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC×GC-TOF-MS).

Tadeusz Górecki, Jochen Vestner, Sulette Malherbe, 2011, Journal of agricultural and food chemistry.

Evaluation of Liquid Chromatography and Capillary Electrophoresis for the Elucidation of the Artificial Colorants Brilliant Blue and Azorubine in Red Wines

F. Lynen, A. de Villiers, A. Crouch, 2003, Chromatographia.

Survey of 3-alkyl-2-methoxypyrazine content of South African Sauvignon blanc wines using a novel LC-APCI-MS/MS method.

M. Stander, A. de Villiers, P. Alberts, 2009, Journal of agricultural and food chemistry.

Identity confirmation of anthocyanins in berries by LC–DAD–IM‐QTOFMS

S. Hann, A. de Villiers, Tim J. Causon, 2020, Electrophoresis.

Development of a novel solid-phase extraction, LC-MS/MS method for the analysis of ethyl carbamate in alcoholic beverages: application to South African wine and spirits

M. Stander, A. de Villiers, P. Alberts, 2011, Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment.

Modeling of the total antioxidant capacity of rooibos (Aspalathus linearis) tea infusions from chromatographic fingerprints and identification of potential antioxidant markers.

M. Daszykowski, B. Walczak, A. de Villiers, 2014, Journal of chromatography. A.

The effect of wine age and tannin composition on tannin activity across consecutive Pinotage red wine vintages

A. de Villiers, W. D. Du Toit, J. Aleixandré-Tudo, 2022, OENO One.

Determination of anthocyanins in wine by direct injection liquid chromatography-diode array detection-mass spectrometry and classification of wines using discriminant analysis.

P. Sandra, P. Májek, A. de Villiers, 2004, Journal of chromatography. A.

Pharmaceutical impurity analysis by comprehensive two-dimensional temperature responsive × reversed phase liquid chromatography.

F. Lynen, G. Desmet, A. de Villiers, 2020, Journal of chromatography. A.

Stir bar sorptive extraction combined with GC-MS analysis and chemometric methods for the classification of South African Wines according to the volatile composition.

P. Sandra, F. Lynen, P. Májek, 2008, Journal of agricultural and food chemistry.

Optimization of a high-resolution radical scavenging assay coupled on-line to reversed-phase liquid chromatography for antioxidant detection in complex natural extracts.

P. Sandra, F. Lynen, A. de Villiers, 2015, Journal of separation science.

Comprehensive Two-Dimensional Hydrophilic Interaction Chromatography (HILIC) × Reversed-Phase Liquid Chromatography Coupled to High-Resolution Mass Spectrometry (RP-LC-UV-MS) Analysis of Anthocyanins and Derived Pigments in Red Wine.

Jochen Vestner, Chandre M. Willemse, M. Stander, 2015, Analytical chemistry.

Multivariate analysis of variance of designed chromatographic data. A case study involving fermentation of rooibos tea.

Beata Walczak, Federico Marini, B. Walczak, 2017, Journal of chromatography. A.

Enhanced Sensitivity in Comprehensive Liquid Chromatography: Overcoming the Dilution Problem in LC × LC via Temperature-Responsive Liquid Chromatography.

K. V. Van Geem, F. Lynen, G. Desmet, 2022, Analytical chemistry.

Stir bar sorptive extraction‐liquid desorption applied to the analysis of hop‐derived bitter acids in beer by micellar electrokinetic chromatography

P. Sandra, F. Lynen, A. de Villiers, 2004, Electrophoresis.

Comprehensive two-dimensional gas chromatography for the analysis of synthetic and crude-derived jet fuels.

P. Sandra, J. Beens, A. de Villiers, 2011, Journal of chromatography. A.

Recent developments in the HPLC separation of phenolic compounds.

A. de Villiers, Kathithileni M. Kalili, 2011, Journal of separation science.

Improving the Accuracy of Predictive 2D-LC Optimization Strategies: Incorporation of Simulated Elution Profiles to Account for Injection Band Broadening in Online Comprehensive Two-Dimensional Liquid Chromatography.

A. de Villiers, Magriet Muller, Tyler Brau, 2024, Analytical chemistry.

M. Muller, A. de Villiers, E. Joubert, 2017, Journal of chromatography. A.

Possibilities and Limitations of Aqueous Temperature Responsive Liquid Chromatography in Comprehensive 2D–LC

F. Lynen, A. de Villiers, Kristina Wicht, 2023, LCGC North America.