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wine faults

winefault (GB)
difetto del vino (I)
défault d’un vin (F)
defeito de vinho (PO)
defecto de vino (ES)

Collective name for defects or undesirable and unacceptable errors in wine, which are mainly unpleasant or disgusting odor and or taste or "only" in appearance (veil, opacities, Crystals, etc.). Among other things, you will be at a wine review and wine address determined, with certain errors or a certain extent such wines then fall out of the rating. Sometimes a distinction is made between wine defects (wine defects) and wine diseases. Second ones are through microorganisms ( bacteria. mushrooms. virus ) induced changes in the wine, which can increase in intensity if appropriate countermeasures are not taken.

Nail polish tone, mold taste, bumpers, cork

In a few cases, it is subjective whether a certain smell and taste is positive or already perceived as an error. Because there are some borderline cases where a certain smell or taste is pleasant and positive for some, but unpleasant to flawed for others. Examples of this are typical petrol tone a Riesling or the earthy Smell and than horse sweat designated tone of a red wine. In addition, there are objectively ascertainable general defects that deviate from a certain standard. The spectrum ranges from barely or barely perceptible to unpleasant and spoiled and also depends on experience and sensitivity. A notable example is the notorious one corked, which is recognized by practiced people with the slightest expression. With appropriate experience, wine errors can be identified or identified quite precisely. You can also learn this, various manufacturers offer flavor sets for this:

Aromaset wine defects

Most of the time, however sensory Assessment insufficient for precise identification. The causes of wine defects can occur during the growth of the grapes and then during the entire processing chain from the vintage to the bottling, but also afterwards during the bottle aging occur. Mostly it is chemical and microbiological processes that are caused by microorganisms such as mushrooms or bacteria triggered or complex reactions of different substances. Causes can also be physical, such as too much contact with oxygen his.

causative substances

The smell and taste of a wine is made up of many chemical compounds. The total extract is between 17 and 30 g / l for a quality wine. They do that flavorings 0.8 to 1.2 g / l. With almost all wine defects, the causative substances are now known. These mostly extremely small quantities are given in milligrams (mg = thousandths), micrograms (µg = millionths) to nanograms (ng = billionths) per liter. In the latter, this means a single grain of wheat of ten tons of wheat. They are perceived from a certain amount, which is called the perception threshold:

wine faults substance quantity
bitter almonds cyanide 0.04 mg
strawberry flavor Furaneol 30 to 40 ng
Foxton aminoacetophenone 0.5 µg
corkedMethoxy-dimethylpyrazine
tribromoanisole (TBA)
Trichloroanisole (TCA)
2 to 4 ng
3 to 4 ng
1 to 5 ng
MäuselnAcetic acid ethyl ester among others 0.1 to 1.6 µg
horse sweat Ethyl catechol (horse stable, sweat)
Ethyl guajacol ( cloves Tar)
Ethylphenol (medical stabbing)
50 µg
50 µg
300 to 600 µg
Black break. metalliciron
copper
zinc
10 mg
2 mg
5 mg
UTA (Atypical age tone) aminoacetophenone 0.5 µg

The substances that cause it can only be undoubtedly analytical Methods are determined. One of them is chromatography (Gas chromatography). A new method for the detection of microbiologically justified wine defects is PNA FISH (Peptide Nucleic Acid Fluorescence In Situ Hybridization). The most important thing in wine production is absolute cleanliness and sterility as well as (usually) avoidance of oxidation (Oxygen-access). This alone can avoid many wine mistakes.

list

The list includes not only wine errors, but also related terms:

Literature and sources

Three particularly recommended books on the complex topic, which were also used as sources with the kind permission of the publishers / authors, are:

Wine Defects - Detect, Avoid, Fix
Austrian Agricultural Publishing Company Druck- und Verlags Ges.mbH Nfg.KG, Leopoldsdorf
Dipl.-Ing. Dr. Reinhard Eder (editorial management) and others

Recognize wine defects - determine, avoid, remedy
Eugen Ulmer KG 2007 / Dr. Edmund Lemperle

Enology
Austrian Agricultural Publishing Company - 2001 Leopoldsdorf
HR Dipl.-Ing. Robert Steidl Dept. Cellaring / Dept. enology
Higher Federal College and Federal Office for Wine and Fruit Growing Klosterneuburg Lower Austria

pictures
Nail polish: image from donations welcome on Pixabay
Grape: By Robert Owen Wahl on Pixabay
Böckser: By Capri23auto from Pixabay
Korker: From 445693 from Pixabay
Wine bug set: © www.aromaster.com

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