BEVERLEY BLANNING MW looks for the best way to keep an open bottle fresh, as she tests a range of stoppers

Normally, a wine drinker only needs to think about the temperature for serving,
which glasses to use and whether or not to decant, all of which are matters of
personal preference.

this simple state of affairs becomes more complicated if the bottle you have
opened remains unfinished – especially if it’s one worth keeping.

fact, the chemistry involved is pretty straightforward: oxygen is the single
culprit for a wine’s deterioration after opening. Beneficial in small doses -
or even large ones for some wines – oxygen will progressively have a
deleterious effect on quality.

So, is there a single best way to preserve wine? To help me answer this,
Decanter sent me six bottles of three different wines to test with a range of
stoppers. Many products claim to keep wine fresh, but there are only two ways
to do this. The most basic method is to put something in the neck of the bottle
to prevent fresh oxygen getting into the wine. But this does nothing to prevent
the oxygen already in the bottle from oxidising the wine, so the emptier the
bottle, the less effective this will be. More complex innovations aim to remove
as much oxygen as possible from the bottle before sealing it.

This is
done either via vacuum or by adding inert gas to displace the oxygen and form a
protective blanket over the surface of the wine. There are several different
vacuum products on the market. Cheap and easy to use, they are a one-off
purchase. The disadvantages are that it will never be possible to remove all
the oxygen in the bottle and, in any case, the effectiveness of a vacuum must
be balanced against the harmful effect of submitting a wine to the violence of
the vacuum process. If a wine is ‘over-vacuumed’, its desirable volatile aromas
are literally sucked out.

One would imagine that using inert gas should give a better result, as this is

often used in wineries to protect wine during the winemaking process. This is a
more expensive option, but has the advantage that it can be used in any container
(such as a decanter).

For the
experiment I chose three vacuum-style stoppers and two inert gas systems, along
with the bottle’s original stopper. Taking three contrasting wines, I opened
six bottles of each, tasted them to ensure they were all consistent, recorded
my notes, and then left them open for an hour to simulate a drinking

The wines were each sealed with a different closure before being opened again 24
hours later, retasted, left open for a further hour, and then resealed. This
process was repeated on 48, 72 and 96 hours.


Wither Hills Sauvignon Blanc, Marlborough, New Zealand 2007 (13% abv, screwcap)
Bouchard Pere et Fils Fleurie, Beaujolais, France 2006 (13% abv, agglomerate cork)
Clos de los Siete, Mendoza, Argentina 2006 (15% abv, natural cork)


: ‘Menu’ Vacuum, Gard’Vin On/Off, Vacuvin

Preserve, Pek Preservino



It was
impossible to say if any of the wine’s original stopper was superior as, in
terms of how the wines developed, more seemed to depend on the wine than the
closure. But it’s fair to say that all three original closures performed less
well than the manufactured stoppers, and for wines where preservation of the
original aroma is key, it’s important to use a stopper that removes oxygen.

Sauvignon Blanc: After 24 hours there were clear and startling differences in
the aromatic profiles of the six Sauvignon Blancs. Most noticeable were the
variations in the wine’s pungent, grassy aromas, which were most pronounced on
the bottle resealed with the original screwcap, and almost absent from bottles
sealed with gas. The latter had more delicate and floral aromatics. The vacuum sealed
wines also had these floral aromas, but seemed to have developed more of green
pungency than the gas preservers. The Sauvignon Blancs were pleasantly
drinkable after a day, though the commercial stoppers all prolonged the
freshness of the wine more effectively than the bottle’s original screwcap.

The third and fourth day showed progressive deterioration of the wine. All but
the screwcapped wine remained drinkable, but the bottle sealed with the Private
Preserve gas cylinder remained much fresher than any of the others.

This crisp, lightweight wine with crunchy fruit was acceptable (even improved)
after a day’s storage under all the alternatives, though the bottle resealed
with the cork was less fresh than the others. Although the fruit was still
vibrant, it seemed rounder and softer after 48 hours.

The best wines appeared to be those sealed with the Vacuvin and Private
Preserve, and this was still the case into the third day.

By the
fourth day, they were all tiring.

: This big, densely coloured wine is high in alcohol and oak tannins. When
first opened, its aromas ranged through oak, violets, coconut, black cherry,
blackcurrants and spice. Although the wine tasted perfectly fine from all of
the stoppered bottles on day two, it never regained the complexity of aroma or
flavour of the first day.

Private Preserve and Gard’Vin preserved the flavour and freshness best.


limited trial shows that while there are significant differences in the
stoppers’ performance, all gave better results than merely sticking the cork
back in the bottle or resealing it with its original screwcap. And while it’s
hard to come to any firm conclusions on which option (vacuum or gas) works best
for which wines, the Private Preserve gas cylinder came out as the best way to
keep our three types of wine fresher for longer.

Written by Beverley Blanning MW