scholarly journals Authentication of Riesling wines from the Czech Republic on the basis of the non-flavonoid phenolic compounds

2013 ◽  
Vol 31 (No. 5) ◽  
pp. 474-482 ◽  
Author(s):  
P. Pavloušek ◽  
M. Kumšta
Keyword(s):  
Czech Republic ◽  
Phenolic Compounds ◽  
Protocatechuic Acid ◽  
Geographical Origin ◽  
Hplc Method ◽  
Canonical Discriminant Analysis ◽  
Multivariate Statistical ◽  
White Wines ◽  
The Czech Republic ◽  
Hydroxybenzoic Acids

Eighteen non-flavonoid phenolic compounds comprising hydroxybenzoic acids, hydroxycinnamates, and stilbenes were analysed in 43 monovarietal wines originated from five wine-growing regions in the Czech Republic. The non-flavonoid phenolic compounds in wine were analysed by a HPLC method. The methods of multivariate statistical analysis were used for the wine discrimination on the basis of the geographical origin. The canonical discriminant analysis (CDA) proved the possibility to discriminate wines according to their provenance on the basis of the following parameters: protocatechuic acid, p-hydroxybenzoic acid, caftaric acid, p-coutaric acid, trans-resveratrol, and cis-resveratrol. On the basis of statistical analyses, 95.4% of the wine samples were correctly classified. The results therefore indicate that the non-flavonoid phenolic compounds can be used to discriminate the geographical origin of white wines.

scholarly journals Varietal differentiation of white wines on the basis of phenolic compounds profile

2013 ◽  
Vol 31 (No. 2) ◽  
pp. 172-179 ◽  
Author(s):  
L. Lampíř
Keyword(s):  
Phenolic Compounds ◽  
Protocatechuic Acid ◽  
Syringic Acid ◽  
Hplc Method ◽  
Hydroxycinnamic Acids ◽  
Analysis Method ◽  
White Wines ◽  
The Czech Republic ◽  
Grapevine Variety ◽  
Hydroxybenzoic Acids

The authenticity of grapevine varieties is a very important topic in the Czech Republic, where varietal wines is very important for wine drinkers. The wines from 7 grapevine varieties were investigated. Sixteen phenolic compounds belonging among hydroxybenzoic and hydroxycinnamic acids, stilbenes, and flavan-3-ols were analysed by HPLC method. The aim of this study was to find markers of varietal origin of wines among the phenolic compounds studied. The analytical parameters obtained were evaluated for this purpose by CVA (canonical varietal analysis) method. It proved to be successful in detecting the following grapevine variety authenticity markers: hydroxycinnamic acids (i.e. p-coutaric acid and caftaric acid), hydroxybenzoic acids (protocatechuic acid and syringic acid), and flavan-3-ols <br />((&ndash;)-epicatechin and (+)-catechin). &nbsp;

scholarly journals Influence of terroir on the concentration of selected stilbenes in wines of the cv. Riesling in the Czech Republic

2012 ◽  
Vol 39 (No. 1) ◽  
pp. 38-46 ◽  
Author(s):  
M. Kumšta ◽  
P. Pavloušek ◽  
J. Kupsa
Keyword(s):  
Czech Republic ◽  
Phenolic Compounds ◽  
Geographical Origin ◽  
Hplc Method ◽  
The Czech Republic ◽  
The Subject ◽  
The Relationship ◽  
Mean Concentration

The relationship between the terroir and the quality of grapes and/or wines is used in wine authenticity determination based on geographical origin. The phenolic compounds in grapes and wines are probably related to the terroir. The subject of the study was the analysis of 43 wines of the cv. Riesling from six wine-growing sub-regions, 16 different localities and four vintages to determine the content of trans-resveratrol, trans-piceid, cis-resveratrol and cis-piceid. The analyses were performed using an HPLC method. A relationship was observed between trans-resveratrol concentration in wines and wine-growing locality. The concentration of trans-resveratrol ranged from 0.04 to 0.82 mg/l with mean concentration of 0.28 mg/l. The highest concentrations of trans-resveratrol were found in wines from the localities Podmol&iacute; (0.66 mg/l), Hostěradice (0.64 mg/l and 0.82 mg/l), Měln&iacute;k (0.59 mg/l) and Litoměřice (0.57 mg/l). Differences were also found in the relationship between trans-resveratrol and wine-growing sub-regions. Relationships between trans-piceid, cis-resveratrol or cis-piceid concentration and wine terroir were not demonstrated. The results of this study demonstrated the capability to differentiate the wine terroir using the trans-resveratrol concentrations.

scholarly journals Influence of locality on content of phenolic compounds in white wines

2013 ◽  
Vol 31 (No. 6) ◽  
pp. 619-626 ◽  
Author(s):  
L. Lampíř ◽  
P. Pavloušek
Keyword(s):  
Czech Republic ◽  
Phenolic Compounds ◽  
Protocatechuic Acid ◽  
Statistical Evaluation ◽  
Hydroxybenzoic Acid ◽  
White Wines ◽  
The Czech Republic ◽  
Caftaric Acid ◽  
Grape Varieties

Phenolic compounds in grapes and wines are significantly influenced by the environment. Phenolic compounds in grapes are therefore a good reflection of terroir. The authentic wines were made from seven white grape varieties and two localities in the Czech Republic. S&aacute;dek is a location on the edge of production wine-growing in the Czech Republic and Pern&aacute; is a typical wine-growing location in the Czech Republic. The profile of phenolic compounds was analysed by HPLC. Based on the statistical evaluation of these results, the following phenolic compounds were found to very well reflect the terroir conditions: protocatechuic acid, p-hydroxybenzoic acid, caftaric acid, cis-piceid, (+)-catechin and (&ndash;)-epicatechin. Since these compounds were not influenced significantly by vintage, they can be good markers of terroir.

scholarly journals The Content of Biogenic Amines in Croatian Wines of Different Geographical Origins

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2570 ◽  
Author(s):  
Ivana Mitar ◽  
Ivica Ljubenkov ◽  
Nikolina Rohtek ◽  
Ante Prkić ◽  
Ivana Anđelić ◽  
...  
Keyword(s):  
Biogenic Amines ◽  
Geographical Origin ◽  
High Sensitivity ◽  
Hplc Method ◽  
Dansyl Chloride ◽  
Red Wines ◽  
White Wines ◽  
Ultraviolet Detector ◽  
Concentration Levels

Samples of white and red wines produced in two different wine-growing regions, coastal (Dalmatia) and continental (Hrvatsko zagorje) of Croatia, were analysed for biogenic amines content. Biogenic amines content was determined, and its concentration levels were associated with the geographical origin of the wine. Due to its high sensitivity, HPLC method with ultraviolet detector was used, including the derivatisation step with dansyl chloride. The method was applied to detect and quantify 11 biogenic amines in 48 red and white wines. It was found that both Dalmatian red and white wines are characterised by tryptamine (0.23–1.22 mg L−1), putrescine (0.41–7.5 mg L−1) and ethanolamine (2.87–24.32 mg L−1). White wines from the Hrvatsko zagorje region are characterised by content of isopentylamine (0.31–1.47 mg L−1), putrescine (0.27–1.49 mg L−1) and ethanolamine (3.80–17.96 mg L−1). In contrast to white wines from the Hrvatsko zagorje region, in the red wines, all biogenic amines except ethylamine, were found and equally presented.

scholarly journals Evaluation of spatial differentiation in the Pilsen region from a socioeconomic perspective

2016 ◽  
Vol 34 (34) ◽  
pp. 73-90 ◽  
Author(s):  
Marie Novotná ◽  
Marta Šlehoferová ◽  
Alena Matušková
Keyword(s):  
Cluster Analysis ◽  
Czech Republic ◽  
Statistical Methods ◽  
Spatial Differentiation ◽  
Multivariate Statistical Methods ◽  
Multivariate Statistical ◽  
The Czech Republic ◽  
Voronoi Map ◽  
The Given ◽  
Statistical Indicators

AbstractThe main objective of this article is to evaluate spatial differentiation in the Pilsen region in the Czech Republic, to create a typology of territorial units, and to evaluate the potential for development and possible threats to development in relation to individual territorial types. To this end, municipal statistical indicators pertaining to population, employment, and economy, were gathered from each of the given territories. The Voronoi map technique was applied to interpolate the values of selected indicators. The typology was created using one of the multivariate statistical methods, namely, the cluster analysis. Furthermore, typological regions and strategies for their development were created.

scholarly journals Evaluation of disparities in living standards of regions of the Czech Republic

2012 ◽  
Vol 60 (4) ◽  
pp. 407-414
Author(s):  
Hana Vostrá Vydrová ◽  
Zuzana Novotná
Keyword(s):  
Cluster Analysis ◽  
Factor Analysis ◽  
Czech Republic ◽  
Analysis Of Variance ◽  
Risk Groups ◽  
Environmental Variable ◽  
Living Standards ◽  
Standard Of Living ◽  
Multivariate Statistical ◽  
The Czech Republic

This paper focuses on regional differences between the regions of the Czech Republic. We will focus on observation of inequalities between indicators of living in different regions of the Czech Republic. The indicators are evaluated at NUTS 3 (regions), using multivariate statistical techniques - factor analysis and cluster analysis. We have identified the twelve indicators of living standards. Base data was reduced using factor analysis on the three emerging factors: 1) basic characteristics, 2) risk groups, 3) environmental variable. Cluster analysis was compiled groups of regions with similar characteristics. Cluster analysis of the breakdown of the county into three clusters based on selected indicators of living standards. They can be described as a group with higher average and lower standard of living. In the first cluster are only two regions (Liberec Region and Karlovy Vary), the third cluster is composed of Prague and the second cluster includes all other regions of the Czech Republic. To verify the evidence of differences between clusters were calculated by multivariate analysis of variance for the various indicators of living standards. An analysis of variance indicates that significant differences between clusters are caused by the standard of living indicators: GDP (regional), the average wage of women, medical equipment, culture entertainment and recreation, higher education, the disabled handicapped and older people. The data were processed in the program STATISTICA 10th.

scholarly journals Development of a rapid resolution HPLC method for the separation and determination of 17 phenolic compounds in crude plant extracts

2011 ◽  
Vol 9 (1) ◽  
pp. 133-142 ◽  
Author(s):  
Aleksandra Mišan ◽  
Neda Mimica-Dukić ◽  
Anamarija Mandić ◽  
Marijana Sakač ◽  
Ivan Milovanović ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Hplc Method ◽  
Total Phenolic ◽  
Rapid Separation ◽  
Rapid Resolution ◽  
Peak Areas ◽  
Hydroxybenzoic Acids ◽  
The Individual

AbstractRapid Resolution HPLC/DAD method, on a 1.8 µm, 4.6×50 mm column, was developed to enable a rapid separation of a mixture of 17 compounds, which consisted of hydroxybenzoic acids, hydroxycinnamic acids, flavones, flavonols, flavanone, flavonol-glycoside and antraquinone, in a single run, within 22 minutes. The developed method is precise, accurate and sensitive enough for simultaneous quantitative evaluation of major compounds in crude and hydrolyzed extracts of parsley, buckthorn, mint, caraway and birch. In order to overcome the inability to quantify all the phenolic compounds present in the samples caused by lack of external standards, HPLC approaches for the total phenolic content estimation based on sum of all integrated peak areas were made. These results were compared with the total phenolic content determined by Folin-Cioacalteu method. Although the correlation between the series of data was not significant (pHPLC was not high in the case of parsley, buckthorn and mint extract. Regarding the obtained results, the HPLC approach could serve as an excellent tool for total phenolic content estimation, without the need for complete identification of the individual compounds.

scholarly journals Proof of authenticity of pure instant coffee

2000 ◽  
Vol 18 (No. 5) ◽  
pp. 165-169 ◽  
Author(s):  
I. Bohačenko ◽  
Z. Veselý
Keyword(s):  
Czech Republic ◽  
Hplc Method ◽  
The Other ◽  
The Czech Republic ◽  
Instant Coffee ◽  
Other Hand ◽  
Hplc Technique ◽  
Total Glucose ◽  
Refractometric Detection

An HPLC method with refractometric detection was worked out for the determination of the limiting contents of marker saccharides (free mannitol and total glucose and xylose) used for the proof of authenticity of pure instant coffee. This method, even though more laborious, yields results comparable with those obtained by the HPAE-PAD method and is intended mainly for those laboratories where the current HPLC technique with refractometric detection is presently used for saccharide analysis. The survey of market supply showed that instant coffee imported in bulk and subsequently packaged in the Czech Republic is most frequently adulterated – only one out of 7 samples examined contained authentic coffee. On the other hand, only one out of 10 samples of instant coffee imported in original packaging did not meet the authenticity criteria. The samples of instant coffee by domestic producers indicated that one producer placed on the market an adulterated product, whereas the other brand is authentic coffee.

scholarly journals Exploratory analysis of selected indicators of the Czech Republic regional labour markets

2011 ◽  
Vol 59 (4) ◽  
pp. 123-128
Author(s):  
Bohumil Kába
Keyword(s):  
Czech Republic ◽  
Statistical Processing ◽  
Composite Indicator ◽  
Labour Markets ◽  
Multivariate Methods ◽  
Multivariate Statistical ◽  
The Czech Republic ◽  
Statistical Procedures ◽  
Regional Labour Markets ◽  
Exploratory Procedures

This paper is focusing on the presentation of statistic exploratory procedures enabling the evaluation of the disparities in regional labour markets in the Czech Republic. Most of the data on labour markets are of multidimensional nature since both employment and unemployment can be described by a lot of various indicators offered by the Ministry of Labour and Social Affairs of the Czech Republic and by the Czech Statistical Office. An analysis of the data collected hence, has to employ multivariate statistical procedures. The choice of indicators in the study presented has been carried out such that it can represent the phenomena basically affecting the economic position of separate regions. The number of indicators analyzed has been limited by the level of applicability of the multivariate methods of statistical processing chosen. In order to reach the target of the paper the indicators of employment and unemployment have been applied to order the separate CR regions and to identify the regions outlying. To this end a composite indicator has been constructed by the so-called point method, one that is capable of aggregating the information supplied by all the separate indicators considered. The first section of the paper describes the way of construction of this aggregate indicator. In the next section then, some algorithms of the cluster analysis are introduced that have been employed to classify regional labour markets of the CR in more detail.

scholarly journals The contents of total polyphenolic compounds and trans-resveratrol in white Riesling originated in the Czech Republic

2011 ◽  
Vol 22 (No. 6) ◽  
pp. 215-221 ◽  
Author(s):  
k. Faitová ◽  
a. Hejtmánková ◽  
j. Lachman ◽  
V. Pivec ◽  
j. Dudjak
Keyword(s):  
Phenolic Compounds ◽  
Oxidation Process ◽  
Hplc Method ◽  
Polyphenolic Compounds ◽  
Average Content ◽  
Total Polyphenols ◽  
The Czech Republic ◽  
Harvest Year ◽  
Gallic Acid Equivalent ◽  
Growing Region

Wine is a significant source of antioxidants in human nutrition. Every glass of wine contains approximately 200&nbsp;different phenolic compounds, several of which have been noted as antioxidants because they have been shown to slow down the potentially damaging cell oxidation process. In white Riesling from different wine-growing sub-regions, kinds of wine, years of harvest and vintners, the content of total polyphenols (TP) was determined using spectrophotometric method, and that of trans-resveratrol (R) by HPLC method. The TP content was presented as gallic acid equivalent per litre of wine, and the content of R as trans-resveratrol per litre of wine. TP values in the wine-growing region of Bohemia ranged from 223.0 to 532.7 mg/l (average content 330.3 mg/l), in the wine-growing region of Moravia from 175.0 to 465.0 mg/l (average content 271.7 mg/l), while R values in the wine-growing region of Bohemia ranged from &lt; 0.033 to 0.421 mg/l (average content 0.117 mg/l), in the wine-growing region of Moravia from &lt; 0.033 to 0.875 mg/l (average content 0.123 mg/l). The highest average TP content (370.1 mg/l) and R content (0.262 mg/l) were found in the sub-region Roudnick&aacute; (the wine-growing region of Bohemia). The harvest year of 1994 was evaluated as that providing the highest average levels of TP (386.5 mg/l) and R (0.201 mg/l). The kind of wine with the highest average TP was the kind of &ldquo;selected grapes&rdquo; (327.2 mg/l), while the highest average R content was found in the late harvest wine (0.141 mg/l). The R and TP contents were not significantly affected by vintage, wine-growing sub-region or the kind of wine. The statistically significant correlation between TP and R content was not demonstrated (5.73%). &nbsp; &nbsp;

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