scholarly journals Determination of Some Phytochemical Contents of Local and Standard Grape Varieties Grown in Diyarbakır Province

2021 ◽  
Vol 5 (4) ◽  
pp. 443-449
Author(s):  
Asuman OKTAY ◽  
Sadettin GÜRSÖZ
Keyword(s):  
Grape Varieties ◽  
Phytochemical Contents

scholarly journals Chemical Composition of White Wines Produced from Different Grape Varieties and Wine Regions in Slovakia

2021 ◽  
Vol 11 (22) ◽  
pp. 11059
Author(s):  
Silvia Jakabová ◽  
Martina Fikselová ◽  
Andrea Mendelová ◽  
Michal Ševčík ◽  
Imrich Jakab ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Mean Value ◽  
Total Phenolic ◽  
White Wines ◽  
Tartaric Acids ◽  
Total Antioxidant ◽  
Total Polyphenolic Content ◽  
Wine Region ◽  
Grape Varieties

In this work, chemical parameters such as sugar (glucose and fructose) content, organic acid (total acids, malic and tartaric acids), total phenolic content and the antioxidant activity of 12 white wines (chardonnay, pinot blanc and pinot gris) from various wine regions in Slovakia were studied in order to identify differences among the varieties and wine-growing regions. The wine samples were examined by Fourier-transform infrared spectroscopy (FTIR) and UV-VIS spectrophotometry (for determination of total polyphenolic content (TPC) and total antioxidant activity (TAA)) methods. Content of alcohol ranged between 11.50% and 13.80% with the mean value 12.52%. Mean content of total acids varied between 4.63 ± 0.09 and 6.63 ± 0.05 g.L−1, tartaric acid varied between 1.62 ± 0.09 and 2.93 ± 0.03 g L−1, malic acid was found in the concentrations ranged from 0.07 ± 0.05 and 2.50 ± 0.08 g L−1 and lactic acid was present between 1.53 and 0.01 g L−1. The content of fructose was, in general, higher in the samples from the Južnoslovenská and Nitrianska wine regions and glucose was higher in the Malokarpatská wine region. Chardonnay wines showed the highest content of total polyphenols and the antioxidant activity in the samples ranged from 51.06 ± 027 to 72.53 ± 0.35% inhibition of DPPH. The PCA analysis based on chemical descriptors distinguished the Nitrianska and Stredoslovenská wine regions. According to similarities among the wine samples, four main classes were formed by cluster analysis.

scholarly journals Acarocomplex of grape plantations of the South of Ukraine

2020 ◽  
pp. 12-16
Author(s):  
Yu. Klechkovskyi ◽  
K. Shmatkovska
Keyword(s):  
Species Composition ◽  
Growing Season ◽  
Spider Mites ◽  
Trophic Groups ◽  
Maximum Phase ◽  
Trophic Links ◽  
Grape Varieties ◽  
Southern Ukraine ◽  
Intensive Growth

Goal. To determine the species composition, dominant species, and territorial distribution of predatory and herbivorous ticks (phytophages) in the vineyards of southern Ukraine. Methods. Field — route surveys of vineyards to study the fauna, trophic links and colonization of vineyards with ticks. Laboratory — determination of the species composition of representatives of the acarofauna of vineyards. Results. During the study period, 17 species of ticks belonging to different trophic groups were identified, among which ticks dominate — phytophages of the Tetranychidae and Eriophyidae families. The most common among them were mites — phytophages, namely spider mites (Shhizotetranychus Oud., Tetranychus turkestanicus Ug.et Nich). Pests during the growing season go through four phases: prodromal, eruptive, gradation maximum and crisis. The graduation maximum phase, which is characterized by their greatest number, was noted during the period of intensive growth of berries and falls at the end of June — beginning of August (BBCH 71—79). The dynamics of the number of ticks by varieties is shown. The varieties most susceptible to spider mites were identified, the period of technical ripeness of which is medium, late or very late. Conclusions. Identified 17 species of ticks belonging to different trophic groups: phytophages, acariphages and mycophages. Based on observations of changes in the number of pests on vineyards during the growing season, four phases are distinguished. The graduation maximum phase occurs at the end of June — beginning of August (VVSN 71—79). It was established that all the studied grape varieties were populated by mites to varying degrees, the most susceptible were varieties of medium and late ripening.

Fast quantitative determination of phenolic compounds in grape juice by UPLC-MS: method validation and characterization of juices produced with different grape varieties

2020 ◽  
Author(s):  
Natalia Alejandra Pisoni Canedo-Reis ◽  
Celito Crivellaro Guerra ◽  
Letícia Flores da Silva ◽  
Luísa Carolina Wetzstein ◽  
Carlos Henrique Junges ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Quantitative Determination ◽  
Method Validation ◽  
Grape Juice ◽  
Grape Varieties

scholarly journals Qualitative and Quantitative Determination of Phytochemical Contents of Indigenous Nigerian Softwoods

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Chukwuma S. Ezeonu ◽  
Chigozie M. Ejikeme
Keyword(s):  
Alternative Medicine ◽  
Moringa Oleifera ◽  
Industrial Applications ◽  
Qualitative And Quantitative Analysis ◽  
Dichrostachys Cinerea ◽  
Qualitative And Quantitative ◽  
Kaempferia Galanga ◽  
Anogeissus Leiocarpus ◽  
Phytochemical Contents

The phytochemical contents of some milled Nigerian softwood chips were carried out in a quest to evaluate their potentials as sources of alternative medicine as well as uses in other industrial applications. The qualitative and quantitative analysis were ascertained. Tannin was found in all the Nigerian softwoods examined with the highest quantities obtained in Sterculia oblonga (1240 mg/100 g) and Barteria nigritiana (1230 mg/100 g). Highest quantities of alkaloid were obtained in Cordia millenii (11.2%) and Sterculia oblonga (10.4%). Barteria nigritiana (14.2%) and Moringa oleifera (12.2%) recorded more flavonoid content than other individual softwoods. Saponin was more in Anogeissus leiocarpus (12.5%) and Dichrostachys cinerea (9.8%). Oxalate was found to be higher in Combretodendron macrocarpum (5.84 g/100 g) and Glyphaea brevis (3.55 g/100 g). Pentaclethra macrophylla (890 mg/100 g) and Moringa oleifera (880 mg/100 g) contained more cyanogenic glycosides. Sacoglottis gabonensis (4.68 mg/g) and Pentaclethra macrophylla (4.04 mg/g) showed the highest contents of phenol, while more lipids (8% and 7.2%) were found in Anogeissus leiocarpus and Kaempferia galanga, respectively. The results showed that these Nigerian softwoods grains could be a source for the exploitation of these phytochemicals beneficial in the pharmaceutical and alternative medicine industries.

scholarly journals Estimation of the degree of stability of grape varieties in arid conditions of the Astrakhan region

2019 ◽  
pp. 17-22
Author(s):  
Елена Полухина ◽  
Elena Polukhina ◽  
М. Власенко ◽  
M. Vlasenko ◽  
Николай Петров ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Water Content ◽  
Water Deficit ◽  
Drought Resistance ◽  
Total Water Content ◽  
Total Water ◽  
Arid Conditions ◽  
Grape Varieties ◽  
High Degree

Abstract. Scientific novelty and practical significance. Due to the presence of a strong root system, the grapes are a rather drought-resistant crop, but the lack of soil and air moisture adversely affects the growth and development of the plant, which ultimately significantly reduces the yield. In the soil and climatic conditions of the Astrakhan region, characterized by a high degree of aridity, as well as the presence of light chestnut structureless soils that retain moisture poorly, the study of the drought tolerance of grape varieties is particularly relevant. The purpose of the research was to study the degree of drought tolerance of grape varieties to identify the adaptive mechanisms of plants in the arid conditions of the region. To achieve the goal, the following tasks were solved: determination of the total water content in the leaves and the relative turghorescence of the leaves; determination of water deficiency in the leaves; determination of water-holding capacity of leaves, as the main indicator of drought resistance. Methods. The object of research was 12 grape varieties of various technological orientations grown on the territory of the vineyard of the Caspian Agrarian Federal Scientific Center of the Russian Academy of Sciences. Were investigated early ripe varieties (Vostorg, Astrahanskij skorospelyj, Madlen muskatnyj, Koroleva vinogradnikov, Shasla belaya, Bianka, Fioletovyj rannij) and mid-season varieties (Kishmish Luchistyj, Husajne rozovyj, Levokumskij). For control were taken: Kodryanka – for early ripe varieties; Karamol – for varieties of medium ripening. The experience laid down by the method of B.A. Dospehov. The scheme of planting bushes 1250.0 pcs/ha. Formation of bushes – fan, four-sleeve. Irrigation was carried out on furrows with a norm of 600.0–800.0 m3/ha. To assess the adaptive resistance of grape varieties to drought, we determined: the total water content in the leaves, the relative turborescence of the leaves according to the Witherly method, the water deficit in the leaves according to the Litvinov method, and the water retention capacity according to the Eremeev method. Results. The lowest water deficit in the group of early ripening varieties was found in the varieties Kodryanka, Madlen muskatnyj and Koroleva vinogradnikov (4.9–5.7 %); in the group of middle-ripening varieties, the varieties are Levokumskij and Kishmish Luchistyj (4.7–5.0 %). As a result of the research, 7 varieties with a high degree of drought resistance were identified: Kodryanka, Astrahanskij skorospelyj, Koroleva vinogradnikov, Shasla belaya, Karamol, Kishmish Luchistyj and Husajne rozovyj.

scholarly journals Effect of grape variety (Vitis vinifera L.) and grape pomace fermentation conditions on some volatile compounds of the produced grape pomace distillate

OENO One ◽  
2004 ◽  
Vol 38 (4) ◽  
pp. 225 ◽  
Author(s):  
Maria Gerogiannaki-Christopoulou ◽  
Nikolaos V. Kyriakidis ◽  
Panagiotis E. Athanasopoulos
Keyword(s):  
Citric Acid ◽  
Vitis Vinifera ◽  
Volatile Compounds ◽  
Internal Standard ◽  
Grape Pomace ◽  
Grape Variety ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Grape Varieties

<p style="text-align: justify;">Agrape pomace distillate was produced from 4 Greek white grape varieties (<em>Vitis vinifera</em> L.). Pomace was fermented with and without addition of citric acid, acting as an antibacterial agent, during fermentation. Fermented grape pomace was distilled in a traditional copper distillation apparatus.. Five major volatile compounds, including methanol, were measured. Pentanol-3 was used as an internal standard. Flame ionization detector (FID) coupled to capillary gas chromatography was used for determination of five volatile distillate components. The addition of citric acid resulted in the reduction of methanol content by about 15%. All the other components studied did not affect in any appreciable degree.</p>

Determination of major anthocyanin pigments in Hellenic native grape varieties (Vitis vinifera sp.): association with antiradical activity

2005 ◽  
Vol 18 (5) ◽  
pp. 375-386 ◽  
Author(s):  
Stamatina Kallithraka ◽  
Adel Abdel-Azeem Mohdaly ◽  
Dimitris P. Makris ◽  
Panagiotis Kefalas
Keyword(s):  
Vitis Vinifera ◽  
Antiradical Activity ◽  
Anthocyanin Pigments ◽  
Grape Varieties
Sign in / Sign up

Export Citation Format

Share Document