Project Number
WW 10-25

Project title
Chemical profiling of non-Saccharomyces wines

Project leader
Jolly, N P

Team members
Jolly, N P
Niewoudt, H H
Minnaar, P P
Booyse, M
Ohlson, S
Adonis, P

Project description
Current industry funded projects conducted at the ARC Infruitec-Nietvoorbij, generate a large number of experimental wines, especially those derived from non-Saccharomyces yeasts. These wines are currently only subjected to superficial chemical analysis. The chemical data emanating from the superficial analysis of the wines limits the conclusions that can be made regarding the overall quality of the wine. Sensory evaluation shows that differences in aroma and mouth-feel cannot be explained by volatile compounds currently being measured and indicates that other chemical compounds are involved.

The aim of this project is, therefore, the elucidation of additional chemical compounds in non-Saccharomyces produced wines to enable more effective protocols and production practices to be implemented. This will result in increased wine quality which will keep the South African wine industry at the forefront and allow it to compete in the global wine market.

Poster(s)
Ngqumba, Z, Minnaar, P P, Jolly, N P, Ximba, B J 2014. The application of an HPLC technique for the quantification of flavanols and flavonols in Chenin blanc wines produced by T. delbrueckii yeast. Poster presented at the ARC Post Graduate Conference and Awards Ceremony. June 2014.

Minnaar, P, Ntushelo, N, Ngqumba, Z, Jolly, N P, 2015. Effect of Torulaspora delbrueckii yeast on the anthocyanin and flavanol concentrations of Cabernet franc and Pinotage wines. Poster presented at the 7th International Conference on Polyphenols and Health. 27-30 October, Tours, France.

Presentation(s)
Minnaar, P P, Ntushelo, N, Ngqumba, Z, Van Breda, V, Jolly, N P 2014. Effect of Torulaspora delbrueckii yeast on the anthocyanin and flavanol concentrations of Cabernet Franc and Pinotage wines. Presented at the 36th South African Society of Enology and Viticulture Conference. 12-14 November, Somerset-West, South Africa.

Article
Minnaar, P P, Ntushelo, N, Ngqumba, Z, Van Breda, V, Jolly, N P. 2015. Effect of Torulaspora delbrueckii yeast on the anthocyanin and flavanol concentrations of Cabernet franc and Pinotage wines, South African Journal of Enology and Viticulture, v. 36 (1) (p. 50-58)
Article.pdf

Minnaar, P P, Ntushelo, N, Ngqumba, Z, Van Breda, V, Jolly, N P. 2017. Effek van gisspesies op rooiwyne, Wineland, Mnth Apr (p. 60-62)
Article.pdf

Ngqumba, Z, Ntushelo, N, Jolly, N P, Ximba, B J, Minnaar, P P. 2017. Effect of Torulaspora delbrueckii yeast treatment on flavanols and phenolic acids of Chenin blanc wines, South African Journal of Enology and Viticulture, v. 38 (2)

FinalReport.pdf