Investigating the Correlation Between Chemical, Sensory and Consumer Preferences of Selected South African Wines: Implementation of Novel Software


Project Number
IWBT W 10-01

Project title
Investigating the correlation between chemical, sensory and consumer preferences of selected South African wines: Implementation of novel software

Project leader
Nieuwoudt, H H

Institution
University of Stellenbosch. Faculty of AgriSciences. Institute for Wine Biotechnology

Team members
Naes, T
Tredoux, A
Muller, N
Silva Ferreira, A
Flaatten, A
Jumat, H

Project description
Previous wine flavour research on South African wines has resulted in significant growth in knowledge of the chemistry of aroma compounds and the effects of viticultural and enological practices on them.

However, the important link between chemical, sensory and consumer preference data is usually not established for most wine products. The results are that the direct economic benefit of chemical and sensory information remains unexploited, and the producing cellar also does not gain the necessary control over directed product development. Partly contributing to this problem is that the results obtained with traditional consumer research methodologies, frequently do not predict consumer behaviour that well. This scenario is also true for wine products.

The objectives are: 1. to expand the existing aroma database of South African wines and to include flavour and health-related chemical compounds 2. to develop new methods for gaining insight into what aspects of a wine product and its promotion consumers use to make their wine purchase decision 3. to assist the development of new statistical and chemometric methods necessary to do these investigations 4. to assist transfer of the new methods developed in this project from research to industry for customised consumer research by South African wine cellars.

This project describes the developmental phase where datasets on South African wine that contain comprehensive information on chemical composition, sensory characteristics and consumers’ drivers of liking and purchase intention, are generated, and used to develop the statistical and chemometric techniques needed for this new holistic approach to consumer research. The challenge of statistical method development is currently a focus point in consumer-related research in international food and wine industries.

The proposal forms part of the four-year international consumer check project of Nofima Food (previously Matforsk Norwegian Food Research Institute) Norway that started on 1st July 2009. The project is supported by the Norwegian National Research Foundation and the research partnership consists of Nofima, the Danish Technical University, Denmark, Stellenbosch University. Institute for Wine Biotechnology and the Department of Food Science and Food Science Australia. The international programme leader is Tormod Næs, Professor at the Agricultural University of Norway and Principal Research Scientist, Nofima. Norway. The main objective of the international project is the development of suitable skills and practical tools for identifying consumers’ drivers for liking of foodstuffs. Logic8 from the Netherlands will act as the provider for data collection software to each of the four national projects. Nofima will act as an active discussion partner at regular project meetings. The benefit to the South African researchers and their industrial partners is access to a team of experts who will assist in experimental design, sensory and consumer profiling and data analysis and interpretation.

Poster(s)
Botha, H, Du Toit, W J, Tredoux, A G J and Nieuwoudt, H H. 2010. Consumer perception, sensory and chemical profiling of South African natural sweet Chenin blanc wine. Poster presented at the 32nd National Congress of the South African Society for Enology and Viticulture. 18-19 November, Somerset West, South Africa.

Lawrence, N, Tredoux, A, Nieuwoudt, H H and Skov, T. 2011. Improved handling of chromatographic wine aroma data. Poster presented at the 12th Scandinavian Symposium on Chemometrics. 7-10 June, Billund, Denmark.

Lawrence, N, Fracassetti, D, Nieuwoudt, H H, Tirelli, A, Du Toit, W J and Tredoux, A. 2010. Development and validation of an analytical method for the quantification of glutathione in white wine and juice by ultra-performance liquid chromatography (UPLC). Poster presented at the International Conference on Analytical Sciences. 5-9 December, Stellenbosch, South Africa.

Van Niekerk, L, Tredoux, A, Naes, T, Muller, N and Nieuwoudt, H H. 2010. South African Chenin blanc wines: New insights on the chemistry, sensory profiles and consumer preference. Poster presented at the 32nd National Congress of the South African Society for Enology and Viticulture. 18-19 November, Somerset West, South Africa.

Fracassetti, D, Lawrence, N, Tredoux, A, Tirelli, A, Nieuwoudt, H H and Du Toit, W J. 2010. Quantification of glutathione in use and wine by ultra-performance liquid chromatography. Poster presented at the 33rd National Congress of the South African Society for Enology and Viticulture. 18-19 November, Somerset West, South Africa.

Presentation(s)
Nieuwoudt, H H. 2009. Chemical, sensory and consumer profiling of South African Chenin blanc wine styles. Presentation at the Chenin Blanc Association General Meeting. 26 November, Stellenbosch, South Africa.

Nieuwoudt, H H. 2010. Report back on consumer studies on Chenin blanc. Presentation at the Chenin blanc Association General Meeting.19 November, Stellenbosch, South Africa.

Lawrence, N, Tredoux, A, Nieuwoudt, H H and Skov, T. 2010. Development of an advanced multidimensional technique for ultra-high performance liquid chromatography with photodiode array detector (UPLC-PAD) for more adequate handling of complex data in wine analysis. Paper presented at the International Conference on Analytical Sciences. 5-9 December, Stellenbosch, South Africa.

Botha, H, Naes, T, Du Toit, W J, Muller, N, Tredoux, A and Nieuwoudt, H H. 2010. Sweet Chenin blanc wines: Chemical, sensory and consumer preference profiling. Paper presented at the 32nd National Congress of the South African Society for Enology and Viticulture. 18-19 November, Somerset West, South Africa.

Lawrence, N, Fracassetti, D, Nieuwoudt, H H, Skov, T and Tredoux, A. 2010. Development of ultra-performance liquid chromatography (UPLC) methods for the analysis of antioxidants in wine. Paper presented at the 32nd National Congress of the South African Society for Enology and Viticulture. 18-19 November, Somerset West, South Africa.

Nieuwoudt, H H. 2012. Driving Chenin blanc as the South African white wine category using sensory and consumer research strategies. Presentation at the SAAFOST Seminar. 2 April, Stellenbosch, South Africa.

Nieuwoudt, H H. 2012. South African Chenin blanc wine benefits from sensometrics. Paper presented at the 2nd South African Chemometrics Society Conference. 9-11 May, Pretoria, South Africa.

Article
Fracassetti. D, Lawrence N, Tredoux, A G J, Tirelli, A, Nieuwoudt, H H, Du Toit, W J. 2011. Quantification of glutathione, catechin and caffeic acid in grape juice and wine by a novel ultra-performance liquid chromatography method, Food Chemistry, v. 128 (p. 1136-1142)

Thesis
Bester, I. 2012. Classifying South African Chenin blanc wine styles. MSc (Wine Biotechnology) University of Stellenbosch, Stellenbosch.

Lawrence, N. 2012. Metabolic profiling of South African Chenin blanc wines: Development of analytical methods for flavour coumpounds (aroma and mouth-feel) and application of chemometrics for resolution of complex analytical measurements. MSc (Wine Biotechnology) University of Stellenbosch, Stellenbosch.

Hanekom, E. 2013. Chemical, sensory and consumer profiling of South African Chenin blanc bush wines. MSc (Food Science) University of Stellenbosch, Stellenbosch, South Africa.

Van Niekerk, L. 2013. Chemical, sensory and consumer profiling of South African Chenin blanc wines: Special focus on dry table wines. MSc (Wine Biotechnology) University of Stellenbosch, Stellenbosch, South Africa.

FinalReport.pdf

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