Research Articles (Viticulture and Oenology)
Recent Submissions
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The impact of changes in environmental conditions on organic acid production by commercial wine yeast strains
(South African Society for Enology and Viticulture, 2018)Acidity is one of the primary sensory elements in wine, and the balance of sugar and acidity is probably the strongest element affecting wine appreciation. However, little is known about how yeast strains and fermentation ... -
Interaction effects of 3-mercaptohexan-1-ol (3MH), linalool and ethyl hexanoate on the aromatic profile of South African dry Chenin Blanc wine by descriptive analysis (DA)
(South African Society for Enology and Viticulture, 2018)Interaction studies are some of the most interesting sensory experiments that highlight the effect of composition on wine perception. The use of single compounds, viz. an ester (ethyl hexanoate), a terpene (linalool) and ... -
Investigation of thiol levels in young commercial South African Sauvignon Blanc and Chenin Blanc wines using propiolate derivatization and GC-MS/MS
(South African Society for Enology and Viticulture, 2018)In this work, the ethyl propiolate method for analysing thiols in white wine by GC-MS, originally proposed by Herbst-Johnstone et al.) (2013), has been adapted to GC-MS/MS and has been validated. The method performance has ... -
Sorting in combination with quality scoring : a tool for industry professionals to identify drivers of wine quality rapidly
(South African Society for Enology and Viticulture, 2018)Quality plays an important role in the criteria directing wine product development. The evaluation of sensory characteristics associated with wine quality, as perceived by industry professionals, is therefore important. ... -
Organic acid metabolism and the impact of fermentation practices on wine acidity : a review
(South African Society for Enology and Viticulture, 2018)The conversion of grape sugar to ethanol and carbon dioxide is the primary biochemical reaction in alcoholic wine fermentation, but microbial interactions, as well as complex secondary metabolic reactions, are equally ... -
Grape flavonoid evolution and composition under altered light and temperature conditions in cabernet sauvignon (vitis vinifera l.)
(Frontiers Media, 2019)The evolution of flavonoids under altered temperature and light conditions in the fruit zone was followed in Cabernet Sauvignon (Vitis vinifera L.) grapes during ripening. The study was conducted over two consecutive seasons ... -
Comparison of vegetation indices for leaf area index estimation in vertical shoot positioned vine canopies with and without grenbiule hail-protection netting
(MDPI, 2019-05-07)Leaf area per unit surface (LAI—leaf area index) is a valuable parameter to assess vine vigour in several applications, including direct mapping of vegetative–reproductive balance (VRB). Normalized difference vegetation ... -
Testing the sensitivity of potential panelists for wine taint compounds using a simplified sensory strategy
(MDPI, 2018-10-24)The odor detection threshold (ODT) of a compound is the lowest concentration at which individuals can reliably perceive a difference between a sample and its corresponding control, with 50% performance above chance. Wine ... -
Measuring thiols in single cultivar South African red wines using 4,4-dithiodipyridine (DTDP) derivatization and ultraperformance convergence chromatography-tandem mass spectrometry
(MDPI, 2018-08-30)Wine varietal thiols are important contributors to wine aroma. The chemical nature of thiols makes them difficult to measure due to low concentrations, high sensitivity to oxidation, and low ionization. Methods for the ... -
Bibliometric and social network analysis in scientific research on precision agriculture
(Indian Academy of Sciences, 2018-11-10)Precision agriculture (PA) is used to improve agricultural processes. A better understanding of PA as well as the evolution of the research status through the available literature are reported and discussed in this study. ... -
Potentially smoke tainted red wines: volatile phenols and aroma attributes
(South African Society for Enology and Viticulture, 2019)Malodourous compounds, including volatile phenols (VPs) are frequently found at concentrations below their odour thresholds in wine, and may therefore be considered to present no threat to wine quality. Most investigations ... -
The impact of different tannin to anthocyanin ratios and of oxygen on the phenolic polymerisation over time in a wine-like solution
(South African Society for Enology and Viticulture, 2019)Colour and phenolic stability during ageing are influenced by the levels of distinct classes of phenolics in young red wines. The ratios between different classes of phenolic compounds also determine the colour and phenolic ... -
RNA-seq based transcriptional analysis of Saccharomyces cerevisiae and Lachancea thermotolerans in mixed-culture fermentations under anaerobic conditions
(BMC (part of Springer Nature), 2019)Background: In wine fermentation starter cultures, the blending of non-Saccharomyces yeast with Saccharomyces cerevisiae to improve the complexity of wine has become common practice, but data regarding the impact of ... -
The transcriptional responses and metabolic consequences of acclimation to elevated light exposure in grapevine berries
(Frontiers Media, 2017)An increasing number of field studies that focus on grapevine berry development and ripening implement systems biology approaches; the results are highlighting not only the intricacies of the developmental programming/re ... -
Spectral knowledge (SK-UTALCA) : software for exploratory analysis of high-resolution spectral reflectance data on plant breeding
(Frontiers Media, 2017)This article describes public, free software that provides efficient exploratory analysis of high-resolution spectral reflectance data. Spectral reflectance data can suffer from problems such as poor signal to noise ratios ... -
detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from Unmanned Aerial Vehicle (UAV) : a case study in a commercial vineyard
(MDPI, 2017)The use of Unmanned Aerial Vehicles (UAVs) in viticulture permits the capture of aerial Red-Green-Blue (RGB) images with an ultra-high spatial resolution. Recent studies have demonstrated that RGB images can be used to ... -
Measuring thiols in single cultivar South African red wines using 4,4-dithiodipyridine (DTDP) derivatization and ultraperformance convergence chromatography-tandem mass spectrometry
(MDPI, 2018)Wine varietal thiols are important contributors to wine aroma. The chemical nature of thiols makes them difficult to measure due to low concentrations, high sensitivity to oxidation, and low ionization. Methods for the ... -
Modelling the sensory space of varietal wines : mining of large, unstructured text data and visualisation of style patterns
(Nature Publishing Group, 2018)The increasingly large volumes of publicly available sensory descriptions of wine raises the question whether this source of data can be mined to extract meaningful domain-specific information about the sensory properties ... -
The effect of grape temperature at pressing on phenolic extraction and evolution in Méthode Cap Classique wines throughout winemaking
(South African Society for Enology and Viticulture, 2018)Maintaining the chemical composition of a wine is essential for the wine industry. Although the sugar-acid balance of a wine is of primary sensory importance, individual acids and oenological parameters are equally important. ... -
Altered fermentation performances, growth, and metabolic footprints reveal competition for nutrients between yeast species inoculated in synthetic grape juice-like medium
(Frontiers Media, 2018)The sequential inoculation of non-Saccharomyces yeasts and Saccharomyces cerevisiae in grape juice is becoming an increasingly popular practice to diversify wine styles and/or to obtain more complex wines with a peculiar ...
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