Comprehensive survey of the distribution of colour and phenolics of different red grape wine vineyard blocks from the Robertson area in South Africa
Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
South African Society for Enology and Viticulture
Abstract
Colour and phenolic content of red grapes are two of the most important constituents required to produce
a quality red wine. In the Robertson grape growing area, difficulty is sometimes experienced with colour
development of grapes. This is especially linked to location and most probably greatly influenced by
season. Forty four vineyard blocks of the cultivars Pinotage, Merlot, Cabernet Sauvignon and Shiraz,
were studied over 3 seasons primarily to focus on colour and phenolic content, but secondly on total
soluble solids, titratable acidity and pH of the grapes. High performance liquid chromatography and
spectrophotometric methods were used to determine various colour and phenolic parameters present at
harvest. This data was used to indicate how colour and phenolic constitution of a part of the Robertson
grape growing area was distributed in relation to various factors, such as cultivar and season. GPS points
were used to map data for the blocks visually. Results showed variable colour and phenolic content for
these grapes based on blocks and phenolic compounds investigated. Shiraz displayed a wider distribution
of certain phenolic compounds over the three seasons than the other 3 cultivars. Seasonality had a great
influence on these results, with outlying blocks being identified.
Description
CITATION: Van der Merwe, H., Nieuwoudt, H. H., De Beer, D. & Du Toit, W. J. 2012. Comprehensive survey of the distribution of colour and phenolics of different red grape wine vineyard blocks from the Robertson area in South Africa. South African Journal of Enology and Viticulture, 33(1):58-71, doi:10.21548/33-1-1307.
The original publication is available at http://www.journals.ac.za/index.php/sajev
The original publication is available at http://www.journals.ac.za/index.php/sajev
Keywords
Phenols, Wine and wine making, Red wines -- South Africa, Grapes
Citation
Van der Merwe, H., Nieuwoudt, H. H., De Beer, D. & Du Toit, W. J. 2012. Comprehensive survey of the distribution of colour and phenolics of different red grape wine vineyard blocks from the Robertson area in South Africa. South African Journal of Enology and Viticulture, 33(1):58-71, doi:10.21548/33-1-1307.