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Storage of wine

Storage is an important consideration for wine that is being kept for long-term aging. While most wine is consumed within 24 hours of purchase, fine wines are often set aside for long-term storage.[1] Wine is one of the few commodities that can improve with age but it can also rapidly deteriorate if kept in inadequate conditions. The three factors that have the most direct impact on a wine's condition are light, humidity and temperature. A fourth consideration can be security for expensive wines. Historically the storage of wine was handled by wine merchants but since the mid-20th century consumers have been increasingly storing their own wine in home-based wine cellars.[2]

Conditions affecting wine
Three factors that have the most pronounced effect on wine in storage: light, humidity and temperature.

Light
Strong, direct sunlight or incandescent light can adversely react with phenolic compounds in wine and create potential wine faults. Delicate, light-bodied white wines run the greatest risk from light exposure and are often packaged in darkly tinted wine bottles that offer some protection from the light. Wines packaged in clear, light green and blue colored bottles are the most vulnerable to light and may need extra precautions for storage. For example, the Champagne house of Louis Roederer uses cellophane wrap to protect its premium cuvee Cristal from light, the wine being packaged in a clear bottle. In the cellar, wines are stored in corrugated boxes or wooden crates to protect the wines from direct light.[1]

Humidity
Some degree of humidity is required in order to keep wines with cork enclosures from drying out. Even when wine bottles are stored on their sides, one side of the cork is still exposed to air. If the cork begins to dry out, it can allow oxygen to enter the bottle, filling the ullage space and possibly causing the wine to spoil or oxidize. Excessive humidity can also pose the risk of damaging wine labels, which may hinder identification or hurt potential resale value. Wine experts such as Jancis Robinson note that 75% humidity is often cited as ideal but there is very little significant research to definitively establish an optimal range.[2] Concern about humidity is one of the primary reasons why wine experts such as Tom Stevenson recommends that wine should not be kept in a refrigerator since the refrigeration process often includes dehumidifying, which can quickly dry out corks.[1]

Some wine experts debate the importance of humidity for proper wine storage. In the Wine Spectator, writer Matt Kramer cites a French study which claimed that the relative humidity within a bottle is maintained at 100% regardless of the closure used or the orientation of the bottle.[3] However, Alexis Lichine contends that low humidity can still be detrimental to premium wine quality due to the risk of the cork drying out. As a way of maintaining optimal humidity, Lichine recommends spreading half an inch of gravel on the floor of a wine cellar and periodically sprinkling it with some water.[4]

Temperature
Wine is very susceptible to changes in temperature, with temperature control being an important consideration in wine storage. If the wine is exposed to too high a temperature (in excess of 77 F (25 C)) for long periods of time, it may become spoilt or "cooked" and develop off flavors that taste raisiny or stewed. The exact length of time that a wine is at risk of exposure to high temperatures will vary depending on the wine, with some wines (such as Madeira which is exposed to high temperatures during its winemaking) being able to sustain exposure to high temperatures more easily than other, more delicate wines (such as Riesling). If the wine is exposed to temperatures that are too cold, the wine can freeze and expand, causing the cork to be pushed out; this will allow more oxygen to be exposed to the wine. Dramatic temperature swings (such as repeated transferring a wine from a warm room to a cool refrigerator) can also cause adverse chemical reactions in the wine that may lead to a variety of wine faults. Most experts, such as Jancis Robinson, recommend that wine be kept at constant temperatures between 50 and 59 F (10 and 15 C). [2] Tom Stevenson speculates that 52 F (11 C) may be the most ideal temperature for storage and aging.[1]

In general, a wine has a greater potential to develop complexity and a more aromatic bouquet if it is allowed to age slowly in a relatively cool environment. The lower the temperature, the more slowly a wine develops.[5] On average, the rate of chemical reactions in wine doubles with each 18 F (8 C) increase in temperature. Wine expert Karen MacNeil, recommend keeping wine intended for aging in a cool area with a constant temperature around 55 F (13 C). Wine can be stored at temperatures as high as 69 F (21 C) without long-term negative effect. Professor Cornelius Ough of the University of California, Davis believes that wine can be exposed to temperatures as high as 120 F (49 C) for a few hours and not be damaged.[6]

Vibration
Although anecdotal information regarding the contributions of vibration in wine storage states that it contributes to the accelerated aging of wine with adverse effects, this remains a research area with relatively little data. In a particular study, vibrations of different frequencies have been shown to have their own distinct effect on the chemistry of the wine though the authors have not stated whether the effects are detrimental to the quality of the wine or if the effects are caused by other aging factors.[7]

References

1. a b c d e f T. Stevenson "The Sotheby's Wine Encyclopedia" pg 46 Dorling Kindersley 2005 ISBN 0-7566-1324-8

2. a b c d e J. Robinson (ed) "The Oxford Companion to Wine" Third Edition pg 664 Oxford University Press 2006 ISBN 0-19-860990-6

3. M. Kramer "Seeking Closure" The Wine Spectator pg 36 October 31st, 2007

4. Lichine, Alexis (1967). Alexis Lichine's Encyclopedia of Wines and Spirits. London: Cassell & Company Ltd.. Chp 6, p.2224.

5. J. Robinson (ed) "The Oxford Companion to Wine" Third Edition pg 5-7 Oxford University Press 2006 ISBN 0-19-860990-6

6. K. MacNeil The Wine Bible pg 79-82 Workman Publishing 2001 ISBN 1-56305-434-5

7. Effect of vibration and storage on some physico-chemical properties of a commercial red wine; Chung, Hyun-Jung | Son, Jin-Ho | Park, Eun-Young | Kim, Eun-Jeong | Lim, Seung-Taik Journal of Food Composition and Analysis, ISSN: 08891575, Vol: 21, Issue: 8, Date: December, 2008, Pages: 655-659

8. a b J. Robinson Jancis Robinson's Wine Course Third Edition pg 42-44 Abbeville Press 2003 ISBN 0-7892-0883-0

9. Caterer Magazine "The lay down on storage" July 26th, 2001

10. "Wine Coolers 101." Winehiker Witiculture. http://www.californiawinehikes.com/winehiker/1/wine-coolers-101/


This article uses material from the Wikipedia article "Storage_of_wine", which is released under the Creative Commons Attribution-Share-Alike License 3.0.