Abstract
The objective of this study was to determine the influence of chitosan treatments, applied in vineyard for plan protection, on the phenolic quality of grapes. The study was conducted for two consecutive years (2020-2021) in the wine center of Murfatlar, Romania, on ‘Fetească neagră’, an ancient but well-known indigenous Romanian grape variety for red wines. Chitosan is meant to offer an alternative for the classic treatment with Bordeaux mixture (BM), which represented the control variant. A combination treatment with half dose of chitosan and half dose of BM was also applied and evaluated. Chemical composition at harvest time was evaluated by measuring the content of sugar, total acidity, pH, total anthocyanin potential (ApH1), anthocyanins extractable at wine pH (ApH3.2), total polyphenol index, skin tannins, seed tannins and seeds maturity. In wines the colour parameters were determined by spectrophotometry and individual phenolic compounds by UHPLC-HRMS. In grapes, accumulation of anthocyanins increased with the total dose of chitosan applied in the vineyard, with higher values in 2020 when temperatures were higher and the rainfall values were typical for the region. Accumulation of tannins in grape skins followed a similar trend. In wine, chitosan determined a significant 72% increase in colour intensity in 2020. Among the individual phenols gallic acid was predominant, with higher values in the rainier year (2021) and significant increases determined by chitosan treatment (especially in 2021 when it increased by 97% as compared to BM treatment). Catechin and epicatechin recorded important increases in the less favourable year (2021), with confirmed increases in both years elicited by the chitosan. Quercetin and myricetin were not influenced by the chitosan treatment, but their increase was correlated with higher temperatures and inversely correlated to the amount of rainfall. Trans-resveratrol ranged between 4.3-8.0 mg L-1 in 2020 and 5.0-6.5 mg L-1 in 2021, with an important increase determined by the chitosan treatment in 2020 (89% increase compared to BM treatment).
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
Chitosan treatment increased grape anthocyanin accumulation with total dose, higher in 2020
Verbatim
e0“on the phenolic quality of grapes”
e1“In grapes, accumulation of anthocyanins increased with the total dose of chitosan applied in the vineyard, with higher values in 2020 when temperatures were higher and the rainfall values were typical for the region”
Claim · model-written summary
Grape skin tannin accumulation followed a similar trend to anthocyanins under chitosan
Verbatim
e0“on the phenolic quality of grapes”
e2“Accumulation of tannins in grape skins followed a similar trend”
Claim · model-written summary
Chitosan increased wine colour intensity by 72% in 2020
- Taxon
- grapese0
- Treatment
- chitosane3
- Outcome
- colour intensitye3
- Direction
- increasee3
- Value
- 72%e3
- Qualifier
- in 2020e3
Not reportedComparator
Verbatim
e0“on the phenolic quality of grapes”
e3“In wine, chitosan determined a significant 72% increase in colour intensity in 2020”
Claim · model-written summary
Gallic acid was the predominant phenol in grapes
Verbatim
e0“on the phenolic quality of grapes”
e4“Among the individual phenols gallic acid was predominant, with higher values in the rainier year (2021) and significant increases determined by chitosan treatment (especially in 2021 when it increased by 97% as compared to BM treatment)”
Claim · model-written summary
Chitosan treatment increased gallic acid in grapes by 97% compared with BM treatment, especially in 2021
Verbatim
e0“on the phenolic quality of grapes”
e4“Among the individual phenols gallic acid was predominant, with higher values in the rainier year (2021) and significant increases determined by chitosan treatment (especially in 2021 when it increased by 97% as compared to BM treatment)”
Claim · model-written summary
Gallic acid was higher in the rainier year 2021 than in other years in grapes
Verbatim
e0“on the phenolic quality of grapes”
e4“Among the individual phenols gallic acid was predominant, with higher values in the rainier year (2021) and significant increases determined by chitosan treatment (especially in 2021 when it increased by 97% as compared to BM treatment)”
Claim · model-written summary
Catechin and epicatechin increased in grapes in the less favourable year 2021
Verbatim
e0“on the phenolic quality of grapes”
e5“Catechin and epicatechin recorded important increases in the less favourable year (2021), with confirmed increases in both years elicited by the chitosan”
Claim · model-written summary
Chitosan increased catechin and epicatechin in grapes in both years
- Taxon
- grapese0
- Treatment
- chitosane5
- Outcome
- Catechin and epicatechine5
- Direction
- increasese5
- Qualifier
- confirmed increases in both yearse5
Not reportedComparator
Verbatim
e0“on the phenolic quality of grapes”
e5“Catechin and epicatechin recorded important increases in the less favourable year (2021), with confirmed increases in both years elicited by the chitosan”
Claim · model-written summary
Chitosan treatment did not influence quercetin and myricetin in grapes
Not reportedComparatorDirection
Verbatim
e0“on the phenolic quality of grapes”
e6“Quercetin and myricetin were not influenced by the chitosan treatment, but their increase was correlated with higher temperatures and inversely correlated to the amount of rainfall”
Claim · model-written summary
Quercetin and myricetin increase in grapes was correlated with higher temperatures
Not reportedDirection
Verbatim
e0“on the phenolic quality of grapes”
e6“Quercetin and myricetin were not influenced by the chitosan treatment, but their increase was correlated with higher temperatures and inversely correlated to the amount of rainfall”
Claim · model-written summary
Quercetin and myricetin increase in grapes was inversely correlated with rainfall
- Taxon
- grapese0
- Treatment
- the amount of rainfalle6
- Compound
- Quercetin and myricetine6
- Outcome
- increasee6
- Qualifier
- inversely correlatede6
Not reportedDirection
Verbatim
e0“on the phenolic quality of grapes”
e6“Quercetin and myricetin were not influenced by the chitosan treatment, but their increase was correlated with higher temperatures and inversely correlated to the amount of rainfall”
Claim · model-written summary
Trans-resveratrol in grapes ranged 4.3-8.0 mg L-1 in 2020
Verbatim
e0“on the phenolic quality of grapes”
e7“Trans-resveratrol ranged between 4.3-8.0 mg L-1 in 2020 and 5.0-6.5 mg L-1 in 2021, with an important increase determined by the chitosan treatment in 2020 (89% increase compared to BM treatment)”
Claim · model-written summary
Trans-resveratrol in grapes ranged 5.0-6.5 mg L-1 in 2021
Verbatim
e0“on the phenolic quality of grapes”
e7“Trans-resveratrol ranged between 4.3-8.0 mg L-1 in 2020 and 5.0-6.5 mg L-1 in 2021, with an important increase determined by the chitosan treatment in 2020 (89% increase compared to BM treatment)”
Claim · model-written summary
Chitosan treatment increased trans-resveratrol in grapes by 89% compared with BM treatment in 2020
Verbatim
e0“on the phenolic quality of grapes”
e7“Trans-resveratrol ranged between 4.3-8.0 mg L-1 in 2020 and 5.0-6.5 mg L-1 in 2021, with an important increase determined by the chitosan treatment in 2020 (89% increase compared to BM treatment)”
The same questions in other papers
chitosan · molecular: metabolites · VitisPositive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
8 papers more in this group
See all 12 papers →chitosan · quality: postharvest · VitisResults agree
11 papers in the same direction as this paper
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.