Optimisation of the Quantification of Total Soluble Solids, pH and Titratable Acidity in South African Grape Must using Fourier Transform Mid-infrared Spectroscopy

Swanepoel, Marinda; Toit, Maret du; Nieuwoudt, Hélène

doi:10.21548/28-2-1467

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Sustainable development in wine grape production also embraces replacing wet chemistry methods with nondestructive technologies such as infrared (IR) spectroscopy to quantify grape compounds rapidly (Swanepoel et al, 2007;Petrovic et al, 2020;Ferrer-Gallego et al, 2022). Infrared spectroscopy methods contribute to all three of the core sustainable concepts.…”

Section: The Quest For Sustainable Assessment Of Grapevine Rot In The...mentioning

confidence: 99%

Winery on-site assessment of grapevine bunch rot: In pursuit of sustainable practices: Winery On-site Assessment of Grapevine Bunch Rot

Cornelissen,

Aleixandre-Tudo,

Nieuwoudt

2023

sajev

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Producer wineries are responsible for the processing of 75% of South Africa’s annual wine grape production. Characteristic to producer wineries is the processing of large volumes of wine grapes, thus incorporating enormous variability in grape quality, which include the presence of grapevine bunch rots. Grapevine bunch rots are detrimental to grape and wine quality. This review begins with the authors bringing background on the industrial situation at producer wineries. A section follows where the economic effect of rot infection on wine production is written about. Two principal reasons why rot infections are inevitably part of grape production are discussed. Challenges for producer wineries in terms of accurate rot assessment is set out. The last part of the review focusses on the quest for sustainable assessment of grapevine bunch rot infections under industrial conditions. Infrared spectroscopy (IR) could provide a sustainable option for objective assessment of rot infection on-site at producer wineries. However, even with the availability of plenty of spectroscopic methods, as well as demonstrated potential of IR spectroscopy for rapid assessment of grapevine bunch rot infections, these methods are yet to be applied routinely under industrial conditions.

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Section: The Quest For Sustainable Assessment Of Grapevine Rot In The...mentioning

confidence: 99%

Winery on-site assessment of grapevine bunch rot: In pursuit of sustainable practices: Winery On-site Assessment of Grapevine Bunch Rot

Cornelissen,

Aleixandre-Tudo,

Nieuwoudt

2023

sajev

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“…In this context, some of the most interesting studies are summarised in Table I and analysed below. In a chemometric exploratory analysis, Fourier Transformed Mid-infrared spectroscopy (FT-MIR) was applied to a grape must sample from South Africa (Swanepoel et al, 2007). The purpose of the study was the simultaneous quantification of total soluble solids (TSS, measured as °Brix), pH, and titratable acidity (TA, expressed as g tartaric acid/L) using PCA and PLS.…”

Section: Determination Of Basic Oenological Parametersmentioning

confidence: 99%

“…The results obtained were satisfactory for qualification analysis, but the analytical accuracies were not good enough to quantify these oenological parameters. This fact was ascribed to an insufficient fit of the South African grape samples to the global FT-MIR WineScan calibrations (Swanepoel et al, 2007). In a similar study, FT-ΜIR in combination with PCA analysis was used to monitor the evolution of red berries from veraison to harvest.…”

Section: Determination Of Basic Oenological Parametersmentioning

confidence: 99%

Fourier transform infrared spectroscopy in monitoring the wine production

Thanasi

Catarino

Ricardo-da-Silva

2022

Ciência Téc. Vitiv.

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The complexity of the wine matrix makes monitoring of the winemaking process from the grapes to the final product crucial for the wine industry. In this context, analytical methodologies that can combine good accuracy, robustness, high sample throughput, “green character”, and by preference real-time analysis, are on-demand to create high-quality vitivinicultural products. In the last years, Fourier-transform Infrared Spectroscopy (FTIR) combined with chemometric analysis has been evaluated in several studies as an effective analytical tool for the wine sector. Some applications of FTIR spectroscopy have been already accepted by the wine industry, mainly for the prediction of basic oenological parameters, using portable and non-portable instruments, but still many others are waiting to be thoroughly developed. This literature review aims to provide a critical synopsis of the most important studies assessing grape and wine quality and authenticity, and to identify possible gaps for further research, meeting the needs of the modern wine industry and the expectations of most demanding consumers. The FTIR studies were grouped according to the main sampling material used - 1) leaves, stems, and berries; 2) grape must and wine applications - along with a summary of the basic limitations and future perspectives of this analytical technique.

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“…Total acidity was measured according to the official methods published by the AOAC [54] and expressed as grams of tartaric acid/100mL of berry juice. The ratio between total soluble solids and total acidity (TSS/ TA) was calculated [55].…”

Section: Fruit Parameters Of Commercial Relevancementioning

confidence: 99%

Meloidogyne incognita population control and nutritional status and productivity of Thompson seedless grapevines managed with different treatments

2020

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A two-year field trial was conducted in a vineyard (northern Egypt)cultivated with Thompson seedless grapevines to evaluate the effectiveness of four "alternative" (biological/chemical) treatments, Bacillus megaterium, boric acid, calcium nitrate and chitosan, against the rootknot nematode Meloidogyne incognita (Mi), compared to that of the nematicide oxamyl. The influence of these treatments on plant nutritional status and fruit yield and quality was also assessed. All treatments significantly inhibited Mi reproduction parameters in both seasons, decreasing the numbers of nematode galls and egg masses (roots) and of second-stage juveniles (soil). Oxamyl application resulted in the highest reductions in Mi-reproduction parameters, followed by boric acid, which also showed the highest relative nematicidal efficacy (respect to oxamyl). In the 1st season, the highest fruit yield (10.34 kg/grapevine) was recorded from boric acid-treated plants, followed by that from oxamyl-treated plants (7.50 kg/grapevine); in the subsequent season (2019), oxamyl use led to the highest yield, followed by boric acid + chitosan use (10.04 and 8.62 kg/grapevine, respectively). In both seasons, application of boric acid alone and combined with chitosan enhanced the total soluble solids (TSS)/total acidity ratio in grape juice. All treatments led to higher nutrient contents (leaf petioles) and chlorophyll levels (leaves) as well as enhanced fruit size and weight. We conclude that the tested treatments can be safely applied for nematode management in Thompson seedless grapevines, with positive effects on fruit yield and quality.

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Optimisation of the Quantification of Total Soluble Solids, pH and Titratable Acidity in South African Grape Must using Fourier Transform Mid-infrared Spectroscopy

Abstract: Calibration models for Fourier transform mid-infrared (FT-MiR

Cited by 7 publications

References 23 publications

Winery on-site assessment of grapevine bunch rot: In pursuit of sustainable practices: Winery On-site Assessment of Grapevine Bunch Rot

Winery on-site assessment of grapevine bunch rot: In pursuit of sustainable practices: Winery On-site Assessment of Grapevine Bunch Rot

Fourier transform infrared spectroscopy in monitoring the wine production

Meloidogyne incognita population control and nutritional status and productivity of Thompson seedless grapevines managed with different treatments

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