WO2006021290A1 - Mittel und verfahren zur bestimmung des gehaltes an phenolischen komponenten in most und wein - Google Patents
Mittel und verfahren zur bestimmung des gehaltes an phenolischen komponenten in most und wein Download PDFInfo
- Publication number
- WO2006021290A1 WO2006021290A1 PCT/EP2005/008280 EP2005008280W WO2006021290A1 WO 2006021290 A1 WO2006021290 A1 WO 2006021290A1 EP 2005008280 W EP2005008280 W EP 2005008280W WO 2006021290 A1 WO2006021290 A1 WO 2006021290A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- test tire
- reagent
- wine
- impregnated
- test
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
- G01N33/14—Beverages
- G01N33/146—Beverages containing alcohol
Definitions
- the invention relates to an agent in the form of a test strip and a method for the rapid determination of the content of polyphenols in must and wine.
- the exact knowledge of these compounds and their properties is still relatively young, because only chromatographic methods allowed a ⁇ differentiation of the difficult to separate components. They have a decisive influence on the taste and the aroma of a wine. On the one hand, they can lead to a bitter taste, on the one hand, especially in the case of white wines, and on the other hand, especially in the case of red wines, they can characterize the varietal structure of the wines and promote maturation and expression of the body. For red wines, they also have a decisive influence on the color intensity.
- Flavors classified as deficient wines often have too high a polyphenol content. Such wines are called e.g. as grassy, tannic, herbaceous, woody or simply bitter. Red wines with a high polyphenol content are rough and hard instead of velvety.
- Targeted control of grape processing can influence the polyphenol content.
- Flavors of taste due to abundant polyphenols may be removed by post-treatment with suitable fining agents, e.g. Gelatin,
- a prerequisite for taking appropriate measures during winemaking is the knowledge of the total polyphenol content, which is about 10 times higher for white wines in the range of about 200 mg / 1 for red wines (Würdig, Wohler: Chemie des Weines, Handbuch der
- the present invention is therefore based on the object to provide a simple method for determining the Bacpolyphenolgehaltes in must / wine samples available that can be used directly in the wine cellar.
- the process must be fast to run, inexpensive and well stocked in the form of a ready-to-use test kit.
- the method according to the invention should be accessible not only to a semiquantitative, visual, but also to a quantitative evaluation with a reflectometer. It has been found that the reagents used in the Folin-Ciocalteau wet-chemical method can, under certain conditions, also be applied to a test strip and thus a dry-chemical detection of the polyphenol content can be made available.
- the invention therefore relates to a test tire for determining the total content of phenolic components in must and wine, characterized in that the test strip is impregnated with a reagent obtained by mixing and heating at least sodium tungstate, sodium molybdate and orthophosphoric acid.
- the reagent with which the test tire is impregnated additionally contains lithium sulfate.
- the reagent with which the test tire is impregnated additionally contains hydrochloric acid.
- sodium tungstate at concentrations between 5 and 50 g / l
- sodium molybdate at concentrations between 1 and 25 g / l
- lithium sulfate at concentrations between 5 and 50 g / l
- the test tire is impregnated with a reagent prepared by a) mixing sodium tungstate and sodium molybdate in water b) adding o-phosphoric acid and hydrochloric acid c) boiling the mixture for several hours under reflux d) adding lithium sulfate
- a reagent prepared by a) mixing sodium tungstate and sodium molybdate in water b) adding o-phosphoric acid and hydrochloric acid c) boiling the mixture for several hours under reflux d) adding lithium sulfate
- the present invention also provides a process for determining the total content of phenolic components in must and wine, characterized by the following process steps: a) providing an aqueous sample and a test tire according to the invention b) alkalizing the sample by adding a base c) briefly immersing the test tire into the sample d) Visual and / or spectroscopic evaluation of the test tire
- the alkalization in step b) is carried out with concentrated sodium hydroxide solution.
- the present invention also provides a kit for determining the total content of phenolic components in must and wine, at least comprising one or more test strips according to the invention and a base for alkalizing the sample.
- Figure 1 shows a calibration curve for the reflectometric determination of polyphenols. Further details can be found in Example 1.
- must and wine means any fluid produced from grapes and other liquids such as fruit juices, beer or other alcoholic beverages, but preferably grape juice, grape must or wine.
- An aqueous sample solution according to the invention is a solution containing must and wine in undiluted or diluted form.
- the aqueous sample solution often dilutes the wine 1: 5 to 1:10 with water, since the determination then leads to better results.
- Phenolic components or polyphenols are all substances found in must and wine that contain at least one phenolic residue wear.
- these are phenolcarboxylic acids, flavones, anthocyanins and catechins (tannins).
- test tire The structure of a test tire is known to the person skilled in the art. Typically it is made of a solid material, e.g. Plastic or stable paper on which at least partially a reaction zone of an absorbent or swellable carrier material is applied.
- the support material of the reaction zone is impregnated with the reagents necessary for the respective detection, i. it is wetted with the appropriate reagents and then dried.
- the detection of the phenolic components by means of the test tire according to the invention is based on the method according to Folin and Ciocalteau (V.L. Singleton et al., Methods in Enzymology, 1999, 299, 152-178).
- the detection system of the invention is in the form of an impregnated matrix, i. All reagents necessary for the detection of phenolic components (coloring reagent and optionally stabilizers and solubilizers) are embedded in an absorbent or swellable carrier. After contact of the reaction zone with the sample, the detection reaction takes place. The color formed is a measure of the amount of the analyte to be determined and is evaluated reflectometrically or visually by comparison with a color chart.
- Absorbent supports may be any materials commonly used for such tests. The most common is the use of filter paper but other absorbent cellulosic or plastic products may be used. It should be noted, however, that reducing agents contained in the carrier materials Substances already react with the detection reagents and can lead to a blue coloration of the test strip. Therefore, the carrier material should contain no or only small amounts of reducing substances, so that the blank value is not too high.
- the absorbent carriers are impregnated in a known manner with impregnating solutions which contain all reagents necessary for the determination.
- the impregnation must be carried out as far as possible with the exclusion of light, since the reagent system is sensitive to light.
- the soaked and dried papers can be suitably cut and glued or sealed in a known manner on carrier films.
- the impregnation solutions according to the invention are obtained by preparing and heating an aqueous solution of at least sodium tungstate, sodium molybdate and phosphoric acid.
- lithium sulfate is additionally added after the heating.
- the reagent is impregnated with the test tire made of sodium tungstate in concentrations between 5 and 50 g / l, sodium molybdate in concentrations between 1 and 25 g / l and lithium sulfate in concentrations between 5 and 50 g / l.
- At least one further acid in particular hydrochloric acid, is preferably added to the reagent in addition to the phosphoric acid.
- the test strip is preferably impregnated with a conventional Folin and Ciocalteau reagent solution diluted 1: 1 to 1:10 with water.
- a suitable method for preparation can be found in (VL Singleton et al., Methods in Enzymology, 1999, 299, 152-178) on page 155.
- Folin and Ciocalteau reagents are prepared according to the following general scheme: a) mixing sodium wolf ramate and sodium molybdate in water b) adding o-phosphoric acid and hydrochloric acid c) boiling the mixture for several hours under reflux d) adding lithium sulfate
- the Folin and Ciocalteau reagent is then optionally diluted with water to impregnate the test strip. Furthermore, the impregnation solution further substances such as stabilizers or buffers can be added.
- the present invention also provides a process for determining the total content of phenolic components in must and wine, characterized by the following process steps: a) providing an aqueous sample and a test tire according to the invention b) alkalizing the sample by adding a base c) briefly immersing the test tire into the sample d) Visual and / or spectroscopic, preferably reflectometric, evaluation of the blue coloration of the test tire
- the alkalization in step b) is carried out with concentrated sodium hydroxide solution.
- the evaluation in step d) is preferably carried out reflectometrically on the basis of a previously prepared calibration curve.
- the present invention also provides a kit for determining the total content of phenolic components in must and wine, at least comprising one or more test strips according to the invention and a base for alkalizing the sample.
- the measuring range of the middle and method according to the invention is between 15 and 300 mg / l.
- Folin-Ciocalteaus phenol reagent (Merck, Art. 1.09001) is diluted with demineralized water in a ratio of 1: 5 and to 500 ml of Marlox® (alkyl polyalkylene glycol, Fa. Hüls) per liter of solution.
- Marlox® alkyl polyalkylene glycol, Fa. Hüls
- the above impregnating solution is applied to a filter paper (for example from Binzer, 1450 CV; acid-washed) with the exclusion of light and then dried with warm air.
- the paper is sealed with hot melt adhesive (e.g., Dynapol S 1272 adhesive) onto a white carrier sheet and suitably cut into strips to give a reaction zone of approximately 6mm x 8mm.
- test strip Immerse the test strip in the sample to be examined for approx. 2 seconds and edge off excess drops laterally.
- a blue color forms on the test zone, which can be evaluated by comparison with a color chart or quantitatively with a reflectometer.
- test strips are evaluated after a suitable reaction time in a small hand-held diode-based reflectometer (Reflectometer RQflex).
- Reflectometer RQflex The relationship between the measured relative remission (%) and the content of polyphenols is shown in Table 1.
- the calibration curve is shown in Figure 1.
- the abscissa indicates the amount of polyphenol (here: catechin hydrate) in mg / l.
- the ordinate shows the remission in%.
- Red wines Samples were diluted at least 1:10 with deionized water before determination.
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/573,846 US20080026470A1 (en) | 2004-08-20 | 2005-07-30 | Device and Method for Determining the Content of Phenolic Components in Must and Wine |
EP05769778A EP1779105A1 (de) | 2004-08-20 | 2005-07-30 | Mittel und verfahren zur bestimmung des gehaltes an phenolischen komponenten in most und wein |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004040343.0 | 2004-08-20 | ||
DE102004040343A DE102004040343A1 (de) | 2004-08-20 | 2004-08-20 | Mittel und Verfahren zur Bestimmung des Gehaltes an phenolischen Komponenten in Most und Wein |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006021290A1 true WO2006021290A1 (de) | 2006-03-02 |
Family
ID=35058648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/008280 WO2006021290A1 (de) | 2004-08-20 | 2005-07-30 | Mittel und verfahren zur bestimmung des gehaltes an phenolischen komponenten in most und wein |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080026470A1 (de) |
EP (1) | EP1779105A1 (de) |
DE (1) | DE102004040343A1 (de) |
WO (1) | WO2006021290A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104535668B (zh) * | 2014-11-17 | 2016-02-10 | 上海应用技术学院 | 一种葡萄酒中多酚物质的高效液相色谱分析方法 |
CN105319331B (zh) * | 2015-11-16 | 2018-11-20 | 惠州学院 | 一种检测水果酒中多酚类物质的方法 |
EP3447488B1 (de) * | 2017-08-25 | 2022-05-18 | Smart Berries Sp. z o.o. | Schnelltest für eine gesamt phenol- und polyphenolkonzentration in flüssigen lebensmittelproben |
CN111351900B (zh) * | 2020-04-01 | 2022-04-08 | 北京燕京啤酒股份有限公司 | 一种啤酒酒花香气成分识别阈值及其与风味成分的协调性评价方法 |
CN113310915A (zh) * | 2021-05-24 | 2021-08-27 | 荆门市食品药品质量检验所 | 一种啤酒中残留直链烷基苯磺酸钠含量的测定方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3915639A (en) * | 1973-10-18 | 1975-10-28 | Robert M Friedenberg | Drug abuse dipstick |
EP0501381A2 (de) * | 1991-02-26 | 1992-09-02 | Francesco Pifferi | Verfahren zum Behandeln und Stabilisieren von flüssigen Nahrunsmitteln mit Wiedergewinnung sowie Regenerierung des Stabilisierungsmittels |
US6153147A (en) * | 1998-10-06 | 2000-11-28 | Craig; James J. | Beverage analysis sample |
US6152966A (en) * | 1998-05-13 | 2000-11-28 | Novo Nordisk A/S | Treatment of cork with a phenol oxidizing enzyme |
-
2004
- 2004-08-20 DE DE102004040343A patent/DE102004040343A1/de not_active Withdrawn
-
2005
- 2005-07-30 WO PCT/EP2005/008280 patent/WO2006021290A1/de active Application Filing
- 2005-07-30 EP EP05769778A patent/EP1779105A1/de not_active Withdrawn
- 2005-07-30 US US11/573,846 patent/US20080026470A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3915639A (en) * | 1973-10-18 | 1975-10-28 | Robert M Friedenberg | Drug abuse dipstick |
EP0501381A2 (de) * | 1991-02-26 | 1992-09-02 | Francesco Pifferi | Verfahren zum Behandeln und Stabilisieren von flüssigen Nahrunsmitteln mit Wiedergewinnung sowie Regenerierung des Stabilisierungsmittels |
US6152966A (en) * | 1998-05-13 | 2000-11-28 | Novo Nordisk A/S | Treatment of cork with a phenol oxidizing enzyme |
US6153147A (en) * | 1998-10-06 | 2000-11-28 | Craig; James J. | Beverage analysis sample |
Non-Patent Citations (1)
Title |
---|
DOKA O ET AL: "DETERMINATION OF TOTAL POLYPHENOLIC CONTENT IN RED WINES BY MEANS OF THE COMBINED HE-NE LASER OPTOTHERMAL WINDOW AND FOLIN-CIOCALTEU COLORIMETRY ASSAY", ANALYTICAL CHEMISTRY, AMERICAN CHEMICAL SOCIETY. COLUMBUS, US, vol. 74, no. 9, 1 May 2002 (2002-05-01), pages 2157 - 2161, XP001132720, ISSN: 0003-2700 * |
Also Published As
Publication number | Publication date |
---|---|
US20080026470A1 (en) | 2008-01-31 |
EP1779105A1 (de) | 2007-05-02 |
DE102004040343A1 (de) | 2006-02-23 |
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