Dr Y Naudé

Tel             + 27 (0)12 420-2517
Email        [email protected]
Office        NS 1, Room 2.19

Position   Manager:
                   Chromatography Mass Spectrometry
Academic qualification      PhD

Teaching

Practical training in chromatographic methods

CMY 383 and CHM 226

Research interests

Development of disposable/re-usable samplers. Human skin chemicals, Emerging pollutants, DDT, Persistent Organic Pollutants, Endocrine Disrupting Chemicals, Aroma compounds, Investigating the origin of the Fairy Circles of Namibia. Air, Water, Soil, Beverages, Medicinal plants, Flower volatiles, Natural products. Olfactometry – specifically the study of synergistic odour effects. Multi-dimensional chromatography.

Publications

Journal articles

Alexis P. Roodt, Yvette Naudé, Anton Stoltz, Egmont Rohwer (2018). Human skin volatiles: Passive sampling and GC×GC-ToFMS analysis as a tool to investigate the skin microbiome and interactions with anthropophilic mosquito disease vectors. Journal of Chromatography B 1097–1098, 83–93. DOI: 10.1016/j.jchromb.2018.09.002

Gabriel B. Akanni, Henriëtte L. De Kock, Yvette Naudé & Elna M. Buys (2018): Volatile compounds produced by Bacillus species alkaline fermentation of bambara groundnut (Vigna subterranean (L.) Verdc) into a dawadawa - type African food condiment using headspace solid-phase microextraction and GC x GC-TOFMS, International Journal of Food Properties, DOI: 10.1080/10942912.2018.1460757

Gabriel B. Akanni, Yvette Naudé, Henriëtte L. de Kock, Elna M. Buys (2018). Diversity and functionality of bacillus species associated with alkaline fermentation of bambara groundnut (Vigna subterranean L. Verdc) into dawadawa-type African condiment. European Food Research and Technology, 1-12.

M. Wooding, E. Rohwer, Y. Naudé (2017). Comparison of a disposable sorptive sampler with thermal desorption in a gas chromatographic inlet, or in a dedicated thermal desorber, to conventional stir bar sorptive extraction-thermal desorption for the determination of micropollutants in water. Analytica Chimica Acta, 984, 107-115. 

M. Wooding, E.R. Rohwer, Y. Naudé (2017). Determination of endocrine disrupting chemicals and antiretroviral compounds in surface water: A disposable sorptive sampler with comprehensive gas chromatography – Time-of-flight massspectrometry and large volume injection with ultra-high performance liquid chromatography–tandem mass spectrometry. J. Chromatogr. A, 1496, 122–132.Y. Naudé, R.

Makuwa, V. Maharaj (2016). Investigating volatile compounds in the vapour phase of (1) a hot water infusion of rhizomes, and of (2) rhizomes of Siphonochilus aethiopicus using head space solid phase microextraction and gas chromatography with time of flight mass spectrometry. South African Journal of Botany, Volume 106, 144–148.

C.P. Gorst-Allman and Y. Naude (2016). Fynbos Products: What’s in the Bottle? An Investigation of Terpenoid Constituents in Fynbos Products by GCxGC-TOFMS and GC-HRT. S. Afr. J. Chem., 69, 213–217.

M. Wooding, N. Aneck-Hahn, R. Bornman, E. Rohwer, Y. Naudé (2016). Die ontleding van endokrienontwrigtende chemikalieë in water met behulp van sorptiewe ekstraksie, GC×GC-TOFMS en UPLC-MS/MS. Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie. ISSN: (Online) 2222-4173, (Print) 0254-3486.

Yvette Naudé, Peter Gorst-Allman and Egmont Rohwer (2015).  A cheap and simple passive sampler using silicone rubber for the analysis of surface water by gas chromatography–time of flight mass spectrometry. Water SA Vol. 41 No. 2 WISA 2014 Special Edition 2015, 182-188.

G. Geldenhuys, E.R. Rohwer, Y. Naudé, P.B.C. Forbes (2015).  Monitoring of atmospheric gaseous and particulate polycyclicaromatic hydrocarbons in South African platinum mines utilisingportable denuder sampling with analysis by thermaldesorption–comprehensive gas chromatography–massspectrometry. Journal of Chromatography A, 1380, 17–28.

Naudé, Y. and Rohwer, E.R., 2013. Investigating the coffee flavour in South African Pinotage wine using novel offline olfactometry and comprehensive gas chromatography with time of flight mass spectrometry. Journal of Chromatography A 1271, 176-180. DOI: 10.1016/j.chroma.2012.11.019

L. van der Wat, M. Dovey, Y. Naudé and P.B.C. Forbes. Investigation into the Aroma of Rosemary using Multi-Channel Silicone Rubber Traps, Off-line Olfactometry and Comprehensive Two-dimensional Gas Chromatography-Mass Spectrometry, S. Afr. J. Chem., 2013, 66, 21–26

Naudé, Y. and Rohwer, E.R., 2012. Novel method for determining DDT in vapour and particulate phases within contaminated indoor air in a malaria area of South Africa. Analytica Chimica Acta 730, 112–119. DOI: 10.1016/j.aca.2012.02.054

Naudé, Y. and Rohwer, E.R., 2012.   Two multidimensional chromatographic methods for enantiomeric analysis of o,p’-DDT and o,p’-DDD in contaminated soil and air in a malaria area of South Africa. Analytica Chimica Acta 730, 120– 126. DOI:10.1016/j.aca.2012.03.028

Naudé, Y., Van Rooyen, M.W., Rohwer, E.R., 2011.  Evidence for a geochemical origin of the mysterious circles in the Pro-Namib desert.  Journal of Arid Environments 75, 446-456. DOI:10.1016/j.jaridenv.2010.12.018

Naudé, Y., Van Aardt, M., Rohwer, E.R., 2009.  Multi-channel open tubular traps for headspace sampling, gas chromatographic fraction collection and olfactory assessment of milk volatiles. Journal of Chromatography A, 2798–2804. DOI:10.1016/j.chroma.2008.09.065

Sivakumar, D., Naudé, Y., Rohwer, E.R., Korsten, L., 2008.  Volatile compounds, quality attributes, mineral composition and pericarp structure of South Africa litchi export cvs. Mauritius and McClean’s Red.  Journal of the Science of Food and Agriculture 88, 1074–1081. DOI: 10.1002/jsfa.3201

Books and/or chapters in books

Naudé, Y. and Rohwer, E.R., 2011. The olfactometric analysis of milk volatiles with a novel gas chromatography based method – a case study in synergistic perception of aroma compounds.  In: Marsili, R. (Ed.), Flavor, Fragrance, and Odor Analysis, Second Edition.  Taylor & Francis Group LLC, Chapter 5.

Conferences

Yvette Naudé and Peter Gorst-Allman, A comparison of the results obtained for the analysis of South African Pinotage wines using GCXGC-TOFMS with hydrogen and helium as carrier gases, 22 to 25 July 2018, Analitika 2018 Conference, Limpopo Province, South Africa and 26 - 30 August 2018, International Mass Spectrometry Conference, Florence, Italy.

M Wooding, T Dodgen, M Bouwer, Y Naudé, ER Rohwer, Chemical profiling of the human skin surface for malaria vector control using a non-invasive solvent modified sorptive sampler with comprehensive gas chromatography – time of flight mass spectrometry (GC×GC-TOFMS) and ultra-performance liquid chromatography – ion-mobility spectrometry – high resolution mass spectrometry (UPLC-IMS-HRMS), 22 to 25 July 2018, Analitika 2018 Conference, Limpopo Province, South Africa and 26 - 30 August 2018, International Mass Spectrometry Conference, Florence, Italy.

Alexis P. Roodt, Yvette Naudé, Anton Stoltz, Egmont Rohwer, A new method for the collection and comparison of human skin volatile chemicals, 3rd Southern Africa Malaria Research Conference, 7 – 9 November 2017, NICD, Johannesburg, South Africa.

Alexis P. Roodt, Yvette Naudé, Anton Stoltz, Egmont R. Rohwer, “A new method for the collection and comparison of human skin volatile chemicals” ISSS conference 2017, 19-22 September 2017, Vienna, Austria.

Alexis P. Roodt, Yvette Naudé, Anton Stoltz, Egmont R. Rohwer, “A new approach for the collection and comparison of volatile skin chemicals for analysis by GC×GC-ToFMS”, ISCC & GC×GC conference 2017, 14-19 May 2017, Fort Worth, USA.

Alex Roodt, Yvette Naudé, Anton Stoltz, Egmont Rohwer (2016). Analysis of volatile human skin chemicals in a malaria context. 2nd South African Malaria Research Conference 31 July-2nd Aug 2016, Groenkloof Campus, University of Pretoria and ChromSAAMS 2016, Vanderbiljpark, South Africa, September 2016.

Madelien Wooding, Egmont Rohwer, Yvette Naudé (2016). Identification of endocrine disrupting chemicals in water by novel sorptive extraction, GC×GC-TOFMS and UHPLC-MS/MS. ChromSAAMS 2016, Vanderbiljpark, South Africa.

40th ISCC 2016 and 13th GCxGC Symposium 29 May-3 June 2016, Riva del Garda, Italy and WISA 2016 May 2016 Durban, South Africa.  A new passive sampler using silicone rubber for the analysis of surface water by comprehensive gas chromatography – time of flight mass spectrometry Yvette Naudé, Peter Gorst-Allman, Egmont Rohwer.

40th ISCC 2016 and 13th GCxGC Symposium 29 May-3 June 2016, Riva del Garda, Italy, Analysis of river, borehole and swimming pool water by comprehensive gas chromatography – time of flight mass spectrometry and comprehensive gas chromatography – high resolution time of flight mass spectrometry Charles P. Gorst-Allman and Yvette Naudé 

40th ISCC 2016 and 13th GCxGC Symposium 29 May-3 June 2016, Riva del Garda, Italy, Identification of endocrine disrupting chemicals in water by novel sorptive extraction, GC×GCTOFMS and UPLC-MS/MS Madelien Wooding, Natalie Aneck-Hahn, Riana Bornman, Egmont Rohwer, Yvette Naudé

SACI 42nd National Convention, 30 November – 4 December 2015, Durban, South Africa. Identification of endocrine disrupting chemicals in water by sorptive extraction, GC×GC-TOFMS and UPLC-MS/MS. Madelien Wooding, Natalie Aneck-Hahn, Riana Bornman, Egmont Rohwer and Yvette Naudé.

SACI 42nd National Convention, 30 November – 4 December 2015, Durban, South Africa. Improved sample preparation to ensure accurate quantification of multiple mycotoxins in maize by liquid chromatography-stable isotope dilution assay-tandem mass spectrometry (LC-SIDA-MS/MS. Wonder Nxumalo, Maria Fernandes-Whaley and Yvette Naudé.

SAAWK, 28-30 October 2015, Bloemfontein, South Africa.  Ontleding van endokrien-ontwrigtende chemikalieë in water met behulp van sorptiewe ekstraksie, GC×GC-TOFMS en UPLC-MS/MS. Madelien Wooding, Natalie Aneck-Hahn, Riana Bornman, Egmont Rohwer en Yvette Naudé.

The National Laboratory Association (NLA) Test and Measurement Conference 2015, 12-14 October 2015, Somerset West, Cape Town, South Africa. Improved sample preparation to ensure accurate quantification of multiple mycotoxins in maize by liquid chromatography-stable isotope dilution assay-tandem mass spectrometry (LC-SIDA-MS/MS). Wonder Nxumalo, Yvette Naudé and Maria Fernandes-Whaley. Poster. Publication of proceedings: http://www.home.nla.org.za/?page_id=1859

SAAFoST, 7-9 September 2015, Durban, South Africa.  Karoo Meat of Origin: Analysis of headspace profiles of lamb meat and fat from animals grazing on grass and Karoo veldt by comprehensive two-dimensional gas chromatography with time of flight mass spectrometric detection and offline olfactometry. Madelien Wooding, Oliver Mwale, Edward Webb, Johann Kirsten, Egmont Rohwer and Yvette Naudé.

SAAFoST, 7-9 September 2015, Durban, South Africa.  Evaluation of Hydrophilic/Lipophilic Balanced Solid Phase Extraction (HLB-SPE) column performance in effective matrix removal for multi-mycotoxin contaminant determination in maize. Wonder Nxumalo, Maria Fernandes-Whaley and Yvette Naudé. Poster.

SAAFoST, 7-9 September2015, Durban, South Africa.  Molecular characterization of Bacillus species and flavour compound profile of alkaline fermented African food condiments. Gabriel B. Akanni, Amanda Minnaar, Riette de Kock, Yvette Naudé, Egmont Rohwer & Elna Buys.

1st International Fairy Circle Symposium 26-27 February 2015, Wolwedans Basecamp – NamibRand Nature Reserve, Namibia.  Hunting the Elusive Plant Killer in the Fairy Circles of Namibia by Comprehensive Gas Chromatography - Time of Flight Mass Spectrometry. Yvette Naudé, Egmont Rohwer, Willem Jankowitz, Noel van Rooyen and Gretel van Rooyen.

ANALITIKA 2014 Conference, Parys, South Africa, 7 – 11 September 2014.  A new passive sampler using silicone rubber for the analysis of surface water by Comprehensive Gas Chromatography – Time of Flight Mass Spectrometry, Yvette Naudé, Peter Gorst-Allman and Egmont Rohwer.

ANALITIKA 2014 Conference, Parys, South Africa, 7 – 11 September 2014.  EVALUATION OF BOND ELUT MYCOTOXIN®, OASIS HLB® AND MULTISEP® AFLAZON+ 226 SPE CARTRIDGES PERFORMANCE IN MATRIX REMOVAL DURING MYCOTOXIN ANALYSIS. WP Nxumalo, M Fernandes-Whaley and Y Naudé. Poster.

38th International Symposium on Capillary Chromatography and 11th GCxGC symposium, May 18 – 23, 2014, Riva del Garda, Italy. An investigation of the volatile constituents of african orchid species by comprehensive gas chromatography - time of flight mass spectrometry. Charles P. Gorst-Allman, Yvette Naudé, Roger Dixon.

WISA Biennial Conference & Exhibition 2014, 25-29 May 2014, Mbombela, Mpumalanga, South Africa. Analysis of dam and river water using a new passive sampling technique employing a silicone rubber trap with detection by gas chromatography – time of flight mass spectrometry. Peter Gorst-Allman and Yvette Naudé.

International Mass Spectrometry Conference (IMSC) Geneva, Switzerland, August 24^th-30^th 2014. Lipid residue analysis by derivitisation and comprehensive Gas Chromatography – Time of Flight Mass Spectrometry as applied to South African Iron Age pottery. Yvette Naudé, Sieglinde Bauermeister, Lauren Mc Dowell, Zurethe Collins, Ceri Ashley, Alexander Antonites and Egmont Rohwer.

38th International Symposium on Capillary Chromatography and 11th GCxGC symposium, May 18 – 23, 2014, Riva del Garda, Italy. A new passive sampler using silicone rubber for the analysis of river water and desert soil by Comprehensive Gas Chromatography – Time of Flight Mass Spectrometry. Yvette Naudé, Peter Gorst-Allman, Gretel van Rooyen and Egmont Rohwer.

12th International Chemistry Conference Africa 2013, Pretoria, South Africa. Determination of DDT in contaminated indoor air and outdoor soil in a malaria area of South Africa – a new environmental forensics tool. Yvette Naudé and Egmont Rohwer.

The 36^th International Symposium on Capillary Chromatography 2012, Riva del Garda, Italy and ChromSAAMS 2012, Dikhololo, South Africa. Investigating the coffee flavour in South African pinotage wine using novel offline olfactometry and TDS-GCXGC-TOFMS. Yvette Naudé and Egmont Rohwer.

ChromSAAMS 2012, Dikhololo, South Africa. Investigating the origin of the enigmatic fairy circles of Namibia by using a simple silicone rubber sampling device and GCXGC-TOFMS. Yvette Naudé, Gretel van Rooyen and Egmont Rohwer.

IUFOST 2010, Cape Town, South Africa
Naudé, Y. and Rohwer E.R.  The analysis of pinotage wine aromas by a novel fractionating olfactometric method combined with comprehensive two dimensional gas chromatography – mass spectrometry

International Symposium Analitika, Stellenbosch, South Africa 2010
Versatile silicone rubber traps for trace organic analysis in a Chromatography and Mass Spectrometry laboratory. E Rohwer, Y Naudé and P Forbes. Analitika 2010 symposium 5-9 December 2010, Stellenbosch.

SACI 2011
Silicone rubber sampling of trace environmental pollutants for analysis by Gas Chromatography - Mass Spectrometry (GC-MS). E Rohwer, Y Naudé and P Forbes. SACI 2011, the 40th South African Chemical Institute (SACI) and Federation of African Societies (FACS) meeting: a prelude event to the international year of chemistry; 17-21 January 2011, Johannesburg. Abstract KN 11 in the Proceedings page 46

The 34th International Symposium on Capillary Chromatography, Riva del Garda, Italy 2010
Naudé, Y. and Rohwer, E.R. New multidimensional chromatographic methods for enantiomeric analysis of o,p’-DDT/D in soil.

International Symposium Analitika 2010, Stellenbosch, South Africa
Naudé, Y. and Rohwer, E.R. New multidimensional chromatographic methods for enantiomeric analysis of o,p’-DDT/D in soil.

Media

Fairy circles of Namibia:

Max Planck Institute: https://www.youtube.com/watch?v=FVIrtZK84kM

Televised appearance in National Geographic Wild – Wild Case Files 2: Fairy Circles of Namibia (Alien Road Kill).