Effects of early leaf removal on grape yield, chemical characteristics, and antioxidant activity of grape variety Cabernet Sauvignon and wine from eastern Croatia

Red wine polyphenols are responsible for its colour, astringency, and bitterness. They are known as strong antioxidants that protect the human body from the harmful effects of free radicals and prevent various diseases. Wine phenolics are influenced by viticulture methods and vinification techniques, and therefore, conventionally and ecologically produced wines of the same variety do not have the same phenolic profile. Ecological viticulture avoids the use of chemical adjuvants in vineyards in order to minimise their negative influence on the environment, wine, and human health. The phenolic profile and antioxidant activity of wine can also be influenced by additional treatments, such as concentration by reverse osmosis. The aim of this study was to investigate the influence of four different pressures (2.5, 3.5, 4.5, and 5.5 MPa) and two temperature regimes (with and without cooling) on the phenolic profile and antioxidant activity of conventional and ecological Cabernet Sauvignon red wine during concentration by reverse osmosis. The results showed that retention of individual phenolic compounds depended on the applied processing parameters, chemical composition of the initial wine, and chemical properties of a compound. Higher pressure and retentate cooling favoured the retention of total polyphenols, flavonoids, and monomeric anthocyanins, compared to the opposite conditions. The same trend was observed for antioxidant activity.

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Assessment of the influence of foliar treatment on productivity and phenolic maturity of grapes

E3S Web of Conferences ◽

10.1051/e3sconf/202123203026 ◽

2021 ◽

Vol 232 ◽

pp. 03026

Author(s):

Svetlana Levchenko ◽

Sofia Cherviak ◽

Vladimir Boyko ◽

Dmitriy Belash ◽

Elena Ostroukhova ◽

...

Keyword(s):

Positive Influence ◽

Sugar Accumulation ◽

Cabernet Sauvignon ◽

Grape Variety ◽

Organoleptic Properties ◽

Experimental Scheme ◽

Urgent Task ◽

Foliar Treatment ◽

Maturity Degree

An urgent task of today for grape growers is to find effective ways to achieve the compliance of conditional parameters to phenolic ripeness of grapes while maintaining high cropping capacity. In this study the influence of foliar treatment of grapes with nitrogen-containing preparations "Siamino Pro 500" on productivity and phenolic maturity of ‘Cabernet-Sauvignon’ grape variety was investigated. Studies were carried out during 2018-2019. Grape maturity degree was assessed by the Glories method, based on the determining of the total and extractable anthocyanin potential of grapes. It was shown that, as a result of the experimental scheme of processing, the cropping capacity increased by 10- 14%, as well as the bunch weight - by 13 - 16%. Use of the preparation contributed to the onset of technical maturity of grapes at the earlier period compared to the control. The content of anthocyanins extracted from the skins was 49- 56%. Experimental grape samples were characterized by a higher content of titratable acids (by 1.4 and 1.2 g/l) and a lower sugar accumulation (by 9 and 16 g/l). Positive influence of the experimental scheme of processing on organoleptic properties of wines was observed.

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Chemical Characteristics, Antioxidant Activity, Total Phenol, and Caffeine Contents in Coffee of Date Seeds (Phoenix dactylifera L.) of Red Sayer Variety

The Journal of Pure and Applied Chemistry Research ◽

10.21776/ub.jpacr.2019.008.02.475 ◽

2019 ◽

Vol 8 (2) ◽

pp. 179-184

Author(s):

Siti Warnasih ◽

◽

Ade Heri Mulyati ◽

Diana Widiastuti ◽

Zuniar Subastian ◽

...

Keyword(s):

Antioxidant Activity ◽

United Arab Emirates ◽

Date Palm ◽

Natural Antioxidants ◽

Phoenix Dactylifera ◽

Total Sugar ◽

Total Phenol ◽

Chemical Characteristics ◽

Phoenix Dactylifera L ◽

Palm Juice

Red Sayer is one of the date varieties from the United Arab Emirates. This variety is one type of dates that is imported into Indonesia and used as processed date palm juice producing waste, namely date seeds. Date seeds can be made into some coffee that is rich in antioxidants and does not contain caffeine. The purpose of this study is to determine the chemical characteristics, antioxidant activity, total phenol, and caffeine contents in coffee of the Red Sayer variety date seeds. Coffee of date seeds is made into powder and then analyzed for its contents of water, ash, protein, fat, carbohydrates and total sugar, besides its antioxidant activity, total phenol, and caffeine levels. The results of the analysis obtained are, as follows: 4.42±0.01% water, 1.17±0.04% ash, 8.55±0.64% protein, 7.34±0.07% fat, 78.52±0.76% carbohydrate, 16.39±0.01% total sugar, 23.81±0.22 µg/mL antioxidant activity (IC50) and 340.65±1.53 mg GAE / 100g total phenol, while caffeine is not detected. Red Sayer date seed coffee, therefore, can be a source of carbohydrates and natural antioxidants that does not contain caffeine.

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Chemical characteristics and antioxidant activity of exopolysaccharide fractions from Microbacterium terregens

Carbohydrate Polymers ◽

10.1016/j.carbpol.2009.01.037 ◽

2009 ◽

Vol 77 (3) ◽

pp. 563-567 ◽

Cited By ~ 25

Author(s):

Mohsen Mohamed Selim Asker ◽

Youssri Mohamed Ahmed ◽

Mohamed Fawzy Ramadan

Keyword(s):

Antioxidant Activity ◽

Chemical Characteristics

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Vines for Wines

10.1071/9780643092181 ◽

2004 ◽

Author(s):

George Kerridge ◽

Angela Gackle

Keyword(s):

Point Of View ◽

Cabernet Sauvignon ◽

Wine Grape ◽

Grape Variety ◽

Great Range ◽

Individual Preferences ◽

Colour Photograph ◽

Grape Varieties

Riesling, Chardonnay, Shiraz and Cabernet Sauvignon grapes can make magnificent wines but there are also many other excellent wine varieties that for many of us are rarely experienced. Vines for Wines will expand the wine lover’s knowledge and appreciation of a great range of wines and help to explore their individual preferences for specific varieties, blends, flavours and styles. This book is based on the highly successful Wine Grape Varieties, which is an aid to identifying grape vines. Vines for Wines, however, focuses on wines from the average consumer’s point-of-view, introducing the different wine grape varieties and the wines made from them, including blends. Each variety is represented by a colour photograph of the grape variety, its current world plantings, wine produced and notes describing the varietal characters for each wine grape variety. The tasting terms and wine notes for each variety provide a benchmark for the consumer to assess the quality of wines they drink, and to allow them to share and compare their experiences confidently with other wine lovers.

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