Development of Tannins and Methoxypyrazines in Grape Skins, Seeds, and Stems of Two Pinot Noir Clones during Ripening

Wimalasiri, Pradeep M.; Harrison, Roland; Hider, Richard; Donaldson, Ivan; Kemp, Belinda; Tian, Bin

doi:10.1021/acs.jafc.3c04864

Cited by 3 publications

(2 citation statements)

References 62 publications

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“…A smaller RMSE indicates that the accuracy of the model is more robust. The two evaluation coefficients were formulated as in Equations ( 4) and (5).…”

Section: Model Performancementioning

confidence: 99%

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Rapid Detection of Tannin Content in Wine Grapes Using Hyperspectral Technology

Zhang,

Wu,

Wang

et al. 2024

Life

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Wine grape quality is influenced by the variety and growing environment, and the quality of the grapes has a significant impact on the quality of the wine. Tannins are a crucial indicator of wine grape quality, and, therefore, rapid and non-destructive methods for detecting tannin content are necessary. This study collected spectral data of Pinot Noir and Chardonnay using a geophysical spectrometer, with a focus on the 500–1800 nm spectrum. The spectra were preprocessed using Savitzky–Golay (SG), first-order differential (1D), standard normal transform (SNV), and their respective combinations. Characteristic bands were extracted through correlation analysis (PCC). Models such as partial least squares (PLS), support vector machine (SVM), random forest (RF), and one-dimensional neural network (1DCNN) were used to model tannin content. The study found that preprocessing the raw spectra improved the models’ predictive capacity. The SVM–RF model was the most effective in predicting grape tannin content, with a test set R2 of 0.78, an RMSE of 0.31, and an RE of 10.71%. These results provide a theoretical basis for non-destructive testing of wine grape tannin content.

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“…A smaller RMSE indicates that the accuracy of the model is more robust. The two evaluation coefficients were formulated as in Equations ( 4) and (5).…”

Section: Model Performancementioning

confidence: 99%

“…They influenced the organoleptic properties of wine by interacting with other components [ 3 ]. Among them, tannins are found in grape skins and seeds and are an important phenolic compound in grapes [ 4 , 5 ]. These compounds impart astringency to wine, which influences its taste and flavor [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Rapid Detection of Tannin Content in Wine Grapes Using Hyperspectral Technology

Zhang,

Wu,

Wang

et al. 2024

Life

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Dynamic changes in proanthocyanidin composition, biosynthesis, and histochemistry in spine grape (Vitis davidii Foëx) tissues during berry development

Yan,

Li,

Zheng

et al. 2024

J Sci Food Agric

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BACKGROUNDSpine grapes are widely cultivated in southern China because of their strong adaptability to hot and humid climates. As a wild species native to China, spine grape (Vitis davidii Foëx) was studied as a resource of proanthocyanidins (PAs). PA composition, biosynthesis, and histochemistry in different tissues (skins, seeds, and stems) during berry development were analyzed in this study.RESULTSThe findings revealed that PA accumulation occurred in concurrence with flowering and was completed by veraison. High‐performance liquid chromatographic results showed that the epicatechin type was the most dominant. The skins were more likely to accumulate PA polymers. Reverse transcription–quantitative polymerase chain reaction analysis revealed that the expression levels of structural genes (flavonoid‐3′‐hydroxylase, flavonoid‐3′5′‐hydroxylase, dihydroflavonol 4‐reductase, leucoanthocyanidin reductase, and leucoanthocyanidin dioxygenase) were positively associated with PA dynamic changes. Histochemical results revealed that PAs in skins were mainly found in the hypodermis of the exocarp, PAs in seeds were mainly found in the middle layer of the outer integument of the testa, and PAs in stems were mainly found in the phloem.CONCLUSIONThis study provides a clear understanding of the spatial and temporal accumulation of PAs in spine grape, and forms a basis for the analysis of structural profiles and synthesis of PAs and their biological effects. © 2024 Society of Chemical Industry.

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From Waste to Wealth: Exploring the Bioactive Potential of Wine By-Products—A Review

Peña-Portillo,

Acuña-Nelson,

Bastías-Montes

2024

Antioxidants

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The present paper explores the biological potential of bioactive compounds present in wine industry wastes, highlighting their valorization to promote sustainability and circular economy. Wine by-products, such as grape pomace and vine shoots, contain a high concentration of polyphenols, flavonoids, anthocyanins and other phytochemicals with antioxidant, anti-inflammatory and anticarcinogenic properties. Both conventional extraction methods, such as solid–liquid extraction, and emerging technologies, including enzyme-assisted extraction, ultrasound-assisted extraction, supercritical fluid extraction, microwave-assisted extraction, pressurized liquid extraction, high-hydrostatic-pressure extraction, and deep natural solvent-assisted extraction (NaDES), are discussed. In addition, the preservation of polyphenolic extracts by microencapsulation, a key technique to improve the stability and bioavailability of bioactive compounds, is addressed. The combination of advanced extraction methods and innovative preservation techniques offers a promising perspective for the valorization of bioactive compounds from wine residues, driving sustainability and innovation in the industry.

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Development of Tannins and Methoxypyrazines in Grape Skins, Seeds, and Stems of Two Pinot Noir Clones during Ripening

Cited by 3 publications

References 62 publications

Rapid Detection of Tannin Content in Wine Grapes Using Hyperspectral Technology

Rapid Detection of Tannin Content in Wine Grapes Using Hyperspectral Technology

Dynamic changes in proanthocyanidin composition, biosynthesis, and histochemistry in spine grape (Vitis davidii Foëx) tissues during berry development

From Waste to Wealth: Exploring the Bioactive Potential of Wine By-Products—A Review

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