How to Store Wine Without a Cork: Managing Oxygen Ingress

How to store wine without a cork is a question about oxygen. When a cork is compromised or absent, managing oxygen exposure becomes your immediate priority to preserve the wine's quality. The primary purpose of a wine closure is to control oxygen ingress, which is crucial for a wine's evolution and protection from faults. Natural corks are traditional, but a variety of stoppers are now available on the market, including cork-based, synthetic, and glass stoppers, as well as screw caps. Each offers different oxygen barrier properties, according to Chanut et al. (2023). If your original cork is damaged or missing, or if you have opened a bottle you do not intend to finish, your goal is to minimize further oxygen exposure. This prevents oxidation-type faults, which can manifest as 'dulling of the aroma, to ‘cardboard’, ‘straw’ and ‘hay-like’ aromas, to ‘sherry-like’ and ‘madeirised’ (AWRI, 2026). In extreme cases, a ‘wet wool’, ‘wet dog’, or ‘varnish-like’ aroma can be evident (AWRI, 2026). Understanding how oxygen interacts with wine and closures under different conditions is essential for maintaining your cellar's integrity and protecting your investment.

What happens if wine is exposed to too much oxygen?

Excessive oxygen exposure can lead to significant wine faults, diminishing the wine's quality and value. The AWRI reports that oxidation is a common fault, particularly in white wines. It can result in sensory characteristics ranging from a dulling of the aroma to 'cardboard', 'straw', 'hay-like', 'sherry-like', and 'madeirised' aromas (AWRI, 2026). In severe cases, aromas described as 'wet wool', 'wet dog', or 'varnish-like' can become apparent (AWRI, 2026).

Beyond general oxidation, specific compounds can develop:

• Acetaldehyde: Levels above 125 mg/L can impart odours described as 'over-ripe bruised apples', 'stuck ferment' character, or 'sherry' and 'nut-like' characters (AWRI, 2026). Yeast can oxidize ethanol to acetaldehyde under oxidative conditions, and acetaldehyde levels increase as wines age due to chemical oxidation of ethanol (AWRI, 2026).
• Volatile Acidity (VA): Often perceived as the odour of vinegar, volatile acidity is a measure of low molecular weight fatty acids, primarily acetic acid (AWRI, 2026). While small amounts are naturally produced during fermentation, increased levels in stored wines are usually attributable to acetic acid bacteria converting alcohol to acetic acid in the presence of oxygen (AWRI, 2026). The aroma threshold for acetic acid can be as low as 0.1: 0.125 g/L, with concentrations above 0.7 g/L generally regarded as detrimental (AWRI, 2026).
• Ethyl Acetate: This ester is perceived as the odour of nail polish remover at a sensory threshold of 12 mg/L (AWRI, 2026). While low levels (30: 60 mg/L) can contribute 'fruity' aromas, concentrations of 150: 200 mg/L are found in defective wines (AWRI, 2026). It is produced by yeast and acetic acid bacteria, and its formation is related to dissolved oxygen levels (AWRI, 2026).

Managing the headspace, or ullage, in your bottles is critical to control oxygen exposure. You can learn more about acceptable wine ullage levels and their implications for condition.

How do different closures affect oxygen transfer?

Closures play a significant role in controlling the rate of oxygen ingress into bottled wine, with different types offering varying barrier properties. A variety of stoppers are available, including cork-based, synthetic, and glass stoppers, as well as screw caps, according to Chanut et al. (2023). Each of these closure types has different oxygen barrier properties (Chanut et al., 2023).

Chanut et al. investigated microagglomerated cork-based stoppers (Diam 5 type) over 24 months. They found that the oxygen diffusion coefficient of the stopper alone was not modified by the presence of model wine, storage position, or storage temperature (Chanut et al., 2023). The total oxygen transfer behaved differently. That figure, which includes transfer through the stopper and at the glass-cork interface, was significantly impacted by the presence of model wine and temperature (Chanut et al., 2023). The glass-cork interface is a major pathway for oxygen entry into bottled wines, according to Chanut et al. (2023). In the study, oxygen transfer at this interface accounted for more than 30% of the total oxygen transfer in the absence of model wine. With model wine present, it accounted for nearly 70% of the total oxygen transfer after three months of storage at 20°C (Chanut et al., 2023).

For alternative wine closures, such as synthetic corks and screw caps, concerns about humidity and oxidation are not as pronounced as with natural corks. However, the relatively recent increase in their usage means there have not been many opportunities for research into their long-term storage and ageing potential. For general guidance on maintaining your cellar, consult our guide to storing wine.

Does bottle orientation impact oxygen ingress?

For microagglomerated corks, the storage position of the bottle, whether vertical or horizontal, does not significantly influence oxygen transfer through the bottleneck-cork system. A study found that for microagglomerated corks in contact with model wine, the position of the bottle during storage-vertical (cork in contact with the vapor phase) or horizontal (cork in contact with the liquid phase)-did not influence oxygen transfer (Chanut et al., 2023). This observation held for all durations measured from 3 to 24 months (Chanut et al., 2023).

This finding for microagglomerated corks contrasts with some traditional advice regarding natural corks. Most wine racks are designed to store bottles on their side. The idea is that constant contact with wine keeps the cork moist and prevents it from drying out, which could allow oxygen to enter. However, a French study cited by Matt Kramer in The Wine Spectator claimed that the relative humidity within a bottle is maintained at 100% regardless of the closure used or the orientation of the bottle.

Other research on agglomerated cork stoppers has shown varied results:

• Mas et al. (2002) found that after 24 months, wines stored upright had higher yellow/brown colour than those stored horizontally, though the differences were not significant (AWRI, 2026). This study also showed higher oxidation for upright samples sealed with agglomerated cork stoppers, with elevated acetaldehyde levels in white wine samples from the 3-month mark onwards (AWRI, 2026).
• Skouroumounis et al. (2005) investigated wooded Chardonnay and Riesling wines and found that bottle orientation (horizontal or upright) had little effect on the chemical composition and sensory properties of the two wines over a 60-month period (AWRI, 2026).

For Champagne and other sparkling wines, upright storage is often recommended. The internal pressure from trapped carbonic gas provides sufficient humidity and protection from oxygen. The Comité Interprofessionnel du Vin de Champagne (CIVC) states that Champagne stored on its side aged more quickly because oxygen seeped in after corks lost elasticity due to wine contact. However, the CIVC still recommends storing Champagne on its side in a cool, dark, draft-free place with generous humidity.

How does temperature influence oxygen transfer?

Storage temperature has a strong impact on oxygen transfer, particularly at the glass-cork interface of microagglomerated corks. While the oxygen diffusion coefficient of the microagglomerated cork stopper alone remains unchanged regardless of temperature, the total oxygen transfer through the bottleneck-cork system is significantly affected (Chanut et al., 2023).

At 20°C, the oxygen barrier properties of the bottleneck-cork system remained unchanged over 24 months of aging (Chanut et al., 2023). However, at 35°C, a temperature easily reached during bottle shipping, total oxygen transfer did not increase significantly for up to 9 months. Beyond that duration, a significant transfer at the glass-cork interface began to occur (Chanut et al., 2023). At 50°C, a tremendous oxygen transfer at the glass-cork interface was noticeable even from 3 months. The total diffusion coefficient approached that of oxygen in the air after 6 months, indicating leakage (Chanut et al., 2023). This increase in transfer at higher temperatures could be due to a partial melting of the surface treatment agent on the cork or a modification of the stopper's mechanical properties (Chanut et al., 2023).

General recommendations for wine storage emphasize constant, cool temperatures:

• Most experts, such as Jancis Robinson, recommend keeping wine at constant temperatures between 50 and 59 °F (10 and 15 °C).
• Tom Stevenson speculates that 52 °F (11 °C) may be the most ideal temperature.
• Karen MacNeil recommends a constant temperature around 55 °F (13 °C) for wine intended for aging.
• 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 wine can be exposed to temperatures as high as 120 °F (49 °C) for a few hours without damage.

However, the AWRI reports that excessive storage temperatures have a marked effect on shelf life, leading to rapid aging and significant deterioration (AWRI, 2026; AWRI Technical Note TN09, 2026). Marais (1986) observed faulty flavors and decreasing overall quality after 12 months’ storage at 30°C (AWRI, 2026; AWRI Technical Note TN09, 2026). Temperatures exceeding 40°C can induce visual and sensory changes in a wine in a matter of days (Ough, 1986, cited in AWRI, 2026; AWRI Technical Note TN09, 2026). Any storage place where the temperature exceeds 25°C for long periods and 40°C for short periods can affect wine quality (Ough, 1992, cited in AWRI, 2026; AWRI Technical Note TN09, 2026).

The AWRI advises against thermal cycling, where temperature varies significantly (Hirlam, 2019a,b, cited in AWRI, 2026). Such fluctuations can cause corks to expand and contract, leading to wine leakage or cork movement, which can affect appearance and marketability (AWRI, 2026; AWRI Technical Note TN09, 2026). Understanding these impacts is crucial for managing your fine wine investment.

Here is a summary of how storage conditions impact oxygen transfer for microagglomerated corks:

Condition (Microagglomerated Corks)	Stopper Alone (D_stopper)	Total Oxygen Transfer (D_total)	Interface Contribution	Key Observation
Initial Reference	1.6 × 10−11 (±0.5 × 10−11) m2 s−1	2.3 × 10−11 (±0.7 × 10−11) m2 s−1	>30%	Baseline oxygen diffusion through the stopper and at the interface.
20°C, no model wine, 24 months	1.9 × 10−11 (±0.6 × 10−11) m2 s−1	3.0 × 10−11 (±0.9 × 10−11) m2 s−1	35%	Stopper's intrinsic oxygen barrier properties remain stable over 24 months.
20°C, with model wine, 3 months	Unchanged	Significantly higher (e.g., 6.7 × 10−11 m2 s−1 for vertical, 4.6 × 10−11 m2 s−1 for horizontal)	Nearly 70%	Presence of model wine significantly increases oxygen transfer at the glass-cork interface.
20°C, with model wine, 24 months	Unchanged	Unchanged from 3 months	Consistent	Barrier properties of the bottleneck-cork system stabilize after initial hydration.
35°C, with model wine, up to 9 months	Unchanged	Similar to 20°C	Consistent	Barrier properties remain stable for up to 9 months at this elevated temperature.
35°C, with model wine, 12 months	Unchanged	Sharp increase (from 5.2 × 10−11 to 3.5 × 10−8 m2 s−1)	Significant	Beyond 9 months, a significant increase in oxygen transfer occurs at the glass-cork interface.
50°C, with model wine, 3 months	Unchanged	Tremendous increase (1.8 × 10−7 m2 s−1)	Significant	High temperature causes a rapid and substantial increase in oxygen transfer at the glass-cork interface, indicating leakage.
50°C, with model wine, 6 months	Unchanged	Further accentuated (7.2 × 10−6 m2 s−1)	Approaching air diffusion	Oxygen transfer reaches levels approaching that of oxygen in the air, confirming leakage.

What are the best practices for short-term storage of opened wine?

When you have an opened bottle of wine and no intention of finishing it immediately, your primary goal is to minimize oxygen exposure to prevent spoilage. Several methods can help preserve the wine's quality for a short period:

• Inert Gas Systems: Wine preservation and dispensing systems often use nitrogen gas to dispense wine and prevent oxidation. Nitrogen gas also helps prevent premature spoilage. The Australian Wine Research Institute notes that inert gas blanketing is used during wine production and packaging to minimize oxidation (AWRI, 2026).
• Re-sealing: While a broken or missing cork is the initial problem, using an alternative, airtight stopper (such as a synthetic cork, glass stopper, or screw cap if the bottle allows) can provide a temporary seal.
• Smaller Containers: Transferring the remaining wine into a smaller bottle that can be completely filled reduces the headspace, thereby limiting the amount of oxygen in contact with the wine.
• Temperature Control: Storing opened wine in a cool, stable environment slows down chemical reactions, including oxidation. However, prolonged storage in a refrigerator could adversely affect wine quality due to vibrations from the compressor, though the Institute has been unable to find literature on this subject (AWRI Technical Note TN09, 2026).

Some methods exist to address specific faults, such as soaking polyethylene in wine to remove TCA taint. These are not general solutions for preventing oxidation in opened bottles. Protecting your investment requires careful consideration of these factors, which can be further explored using our landed cost calculator.

Understanding the optimal hold times per style is crucial for managing your cellar. Our data can help you decide when to open your bottles to enjoy them at their peak.