C9 - Red and Rose Winemaking /checked Flashcards
Name the 2 main methods to handle the fruit before fermentation.
- Crushed Fruit Fermentation (majority is Destemmed)
2. Whole Bunch Fermentation
What do some red winemakers do after crushing?
Leave the grapes to macerate for a period of a low temperature
What is the name of the process of skin contact after crushing, before fermentation is started?
Cold Maceration/Cold Soaking
What is the purpose of Cold Maceration/Cold Soaking?
To extract colour and flavour compounds
Tannins are more soluble in alcohol and therefore not readily extracted at this point
Between what temperatures does red wine fermentation usually occur?
20C - 32C (depending on style)
Why are the temperatures of fermentation higher for red wine than for white?
To aid extraction of colour, flavour and tannin
Beyond what temperature should red wine fermentation not go?
Why?
35C
This may kill the yeast
How may a red winemaker influence the amounts of colour, flavour and tannin extracted during fermentation?
By precise TEMPERATURE CONTROL
Describe how tannin levels may be reduced in red wines
By reducing the temperature near the end of fermentation
What is the mass of pulp and skins called, that forms on a fermenting red wine?
The CAP
What will be the result if the cap is left to float on a wine?
LITTLE EXTRACTION of colour, flavour or tannin.
Name 4 techniques to manage the cap (and therefor extraction)
- Punching Down
- Pumping Over
- Rack and Return
- Rotary Fermenters
What was the big problem with the traditional method of punching-down?
CO2 intoxication of workers
Which cap management technique is particularly effective at extracting colour and tannin?
Punching down
What is the potential problem when punching down, mechanical or otherwise?
When is it most important to consider this/why?
It can be too effective at extracting colour and tannin
At the end of fermentation because due to the increasing alcohol, tannins are more easily extracted at this point
What is pumping over?
It involved drawing off juice from the bottom of the vat and pumping it onto the top of the fermenting wine
What is pumping over particularly good at?
It is a good way of OXYGENATING the juice and DISSIPATING HEAT
Describe Rack and Return
The fermenting juice is drained from the vessel into another one, leaving the cap behind
The juice is then pumped back over the cap
What is the big disadvantage of Rack and Return? How is this managed?
It can be very extractive
It is only performed once or twice during a fermentation
What is Rack and Return particularly good at?
Dissipating heat
Describe Rotary Fermentation
Fermentation takes place in ROTATING HORIZONTAL TANKS
What is the intention of Rotary Fermentation?
To keep the juice in constant contact with the skins
What effect does cap management techniques have on the characteristics of the fermentation vessel that’s used? (2)
- Usually large
2. Often open-topped
What kind of vessel should NOT be used for fermenting red wines?
Why?
Oak Barrels (e.g. barrique)
It would be almost impossible to maintain sufficient contact between the skins and the juice
What is the main aim of post-fermentation maceration?
There is a paradox in this
To extract further tannin
Some winemakers have found that extended periods of post-fermentation maceration can create a smoother tannin structure
What happens to red wine immediately after fermentation/maceration? (2 streams)
- The free run wine is drawn off the skins = FREE RUN WINE
2. The remaining mass is pressed = PRESS WINE
What is press wine?
The wine which is released from pressing the grape mass after fermentation (in the case of red wine)
Describe how press wine differs as it’s being pressed
It is similar in composition to free-run wine at the beginning, but has DEEPER COLOUR and HIGHER TANNIN as pressing continues
How is press wine managed by red winemakers?
They will usually separate the wine at different stages of pressing - FRACTIONS
What is the name for the wines separated at different stages of pressing?
PRESS FRACTIONS
What may press fractions be used for later in the process of red winemaking?
To adjust COLOUR and TANNIN in the final BLEND
What is the main consideration for a winemaker when they are using whole bunches?
Why?
That the STEMS must be RIPE
The unripe stems of a whole bunch may give the finished wine an undesirable bitter taste
What is the main reason for using whole bunches during fermentation?
To create an OXYGEN FREE environment for the uncrushed grapes
What are the 2 main outcomes of creating an oxygen-free environment for fermenting grapes?
- Intracellular fermentation (no yeast involved)
2. Distinctive aromas are created within the berry
Define Intracellular Fermentation
Berries create alcohol within their cells without the involvement of yeast
List the three forms of whole-bunch fermentation
- Carbonic maceration
- Semi-carbonic maceration
- Whole bunches with crushed fruit
List the key stages of carbonic maceration (5)
- Whole uncrushed bunches are placed into vats which are FILLED WITH CO2 to remove all oxygen
- Intercellular fermentation begins
- At 2% alcohol, the grapes begin to split and they begin to release their juice
- The grapes are pressed
- Yeast completes the fermentation (off the skins)
What is the key structural difference in wines made using carbonic maceration? (2)
Extraction of:
- LOTS OF COLOUR
- LITTLE TANNIN
What are the distinctive aromas/flavours of a wine made with carbonic maceration? (4)
- Kirsch
- Banana
- Bubblegum
- Cinnamon-like spice
Describe semi-carbonic maceration? (5)
- NO CO2 added
- The vat is filled with whole bunches
- The WEIGHT of the whole bunches CRUSHES those at the bottom, releasing some juice
- Ambient yeast begin to ferment the juice at the bottom, filling the tank with CO2 as a by-product
- Remaining grapes undergo carbonic maceration as normal
Name a notable wine style which is made using semi-carbonic maceration. How is this process different?
Some premium Pinot Noirs
Alcoholic fermentation continues on the skins
How is the winemaking process different when semi-carbonic maceration is used for premium Pinot Noir? (4)
- Grape skins are progressively broken up during punching down
- An ever-decreasing amount of carbonic maceration takes place until all grapes are broken up
- Normal fermentation may continue on skins
- Post-fermentation maceration may take place
What is the potential result of the premium pinot noir approach to semi-carbonic maceration?
- It can result in a BETTER INTEGRATION of AROMAS from intracellular fermentation and the aromas from the grape variety
- Wine have a FRESHER FRUIT character
How is intracellular fermentation encouraged when whole bunches are mixed with crushed fruit?
The whole grapes are usually submerged in the juice of the crushed ones, resulting in a lack of access to oxygen for the whole grapes
How are the more ‘carbonic’ characteristics created when using whole bunches with crushed fruit?
Using a LARGER PERCENTAGE of whole bunches
What are thought to be the outcomes of using a greater percentage of whole bunches with crushed fruit? (2)
- Silkier texture
2. Brighter, fresher fruit characteristics
What is the most important decision when it comes to pre-bottling maturation when making red wines?
The option of whether or not to use oak
TO OAK OR NOT TO OAK
How frequent is MLF used in red winemaking?
Virtually all red wines undergo MLF
Do red wines benefit from extended time on lees?
Why?
NO
The generally more robust flavours of red wines mean they benefit less from extended time on lees than white wines do.
What trend is noted with respect to maturing premium red wine entirely in small new oak barrels?
This trend is declining in most wine regions.
Wine producers are now aiming for Subtlety and integration, achieved by using oak vessels of different ages and larger sizes.
What is BLENDING used for in the making of red wine?
Give examples
To enhance or balance out certain aspects of the wine, such as colour, body, tannin, acidity and flavour.
What is used in red winemaking to boost colour, flavour and tannin in the more delicate free-run wines?
BLENDING
The use of different press fractions
Why might a red winemaker avoid clarification and/or stabilisation?
Some winemakers believe that these processes may harm the wine’s structure
How may clarity be achieved without filtration in a red wine?
By allowing gradual SEDIMENTATION through extended maturation
Describe the grape-growing areas responsible for high-volume, inexpensive red wines
They tend to be WARM, SUNNY, DRY