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Winemaking Fermentation Techniques and Mouthfeel: An ICV Perspective Dominique DELTEIL

ICV Guideline for Mouthfeel Management. Presentation plan. ICV Guideline for Mouthfeel ManagementThe Sensory Tools : sensory method, database, reference profilesChemical background of ICV sensory descriptorsEnzymes, Yeast, Nutrients and Cap Management :

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Winemaking Fermentation Techniques and Mouthfeel: An ICV Perspective Dominique DELTEIL

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    1. Winemaking Fermentation Techniques and Mouthfeel: An ICV Perspective Dominique DELTEIL

    3. Presentation plan ICV Guideline for Mouthfeel Management The Sensory Tools : sensory method, database, reference profiles Chemical background of ICV sensory descriptors Enzymes, Yeast, Nutrients and Cap Management : Good Practices to manage Mouthfeel Profile ICV Practical Consulting Testimony for : Grape ripening Enzymes, Yeast, Nutrients, Cap Management

    6. What is ICV Mouthfeel ? A Quantified Descriptive Sensory Analysis Profile (QDSAP) With 6 descriptors : A precise procedure with : A fixed and measured order A fixed rhythm, in order to standardize the wine/saliva/mucosis interactions, and therefore improve repeatability

    7. The 6 Descriptors of ICV MouthfeelProfile (Red wines)

    9. ICV Mouthfeelof a so-called round, big, good tannin or Ultra Premium Red wine

    10. ICV Mouthfeelof a so-called thin, hollow, green tannin red

    11. ICV Mouthfeelof a so-called tannic, over-extracted red

    12. ICV Mouthfeelof a so-called Brett- killed great Cab red

    15. ICV Sensory Positionning of Commercial Wines. Ultra Premium Reds. Structured scale with 4 levels. From : Delteil, 2001

    18. Foremouth Volume: main compounds involved Ethanol: + (up to 14%vol) Polysaccharides from grape, yeast, bacteria & oak: + Sugar: + Acids, salts: + (until a certain level and according to other elements) Glycrol ? (a myth just a short sweet peak in the mid-palate and a higher dryness in the finish) Volatile compounds with ripe, sweet smell: + (the portion of those compounds that stays in solution in the wine has a smooth impact on the mouth mucosis). Sulphur off-flavours: - (the portion of these compounds that stays in solution in the wine has an agressive and cold impact to the mouth mucosis).

    19. Foremouth Volume: sensory interferences Influence of all the other descriptors: A physiological influence (the sensation step of ASDQ): for example, a high acidity interferes during the measurement of the Foremouth Volume, usually lowering the sensation (of what we perceive) A psychological (the translation step of ASDQ): for example, herbaceous mouth aromas pushes to lower the Volume mark, even when the sensation was the same General trend: Foremouth Volume and Bitterness have a negative correlation (when Volume is high, generally bitterness is low)

    20. Acidity: main compounds involved Acids: tartaric, malic, lactic, succinic (+) Sugar : - - Tannins (+ or -, depending on their quality) Certain volatile compounds (those that give sulphur, chemical and herbaceous aromas) : + (physiological and psychological reasons) Certain volatile compounds (those that give ripe, fruity, spicy aromas) : - (physiological and psychological reasons) Polysaccharides from grape, yeast, bacteria or oak: -

    21. Acidity: sensory interferences Influence on all the other mouthfeel descriptors : physiological and psychological reasons + or - correlation with Volume + correlation with Tannic Intensity + correlation with Dryness + correlation with Bitterness

    22. Tannic Intensity: main compounds involved Grape Tannins and Oak Tannins: + Acids: + Sugar : 0 Certain volatile compounds (those that give sulphur, chemical and herbaceous aromas) : + (physiological and psychological reasons) Certain volatile compounds (those who give ripe, fruity, spicy aromas) : - (physiological and psychological reasons) Yeast in suspension (wine just stirred): + Polysaccharides from grape, yeast, bacteria or oak: -

    23. Tannic Intensity: sensory interferences Strong influence of Acidity (+), sulphur, chemical and herbaceous aromas (+) Note again: + means the intensity evolves in the same way. They are not necessarily interesting attributes

    24. Astringency: main compounds involved Grape Tannins and Oak Tannins: + Acids: + Sugar: 0 Sulphur, chemical and herbaceous aromas: + Certain volatile compounds (those that give ripe, fruity, spicy aromas) : - (physiological and psychological reasons) Ethanol: - up to 14%vol, + over 14%vol. Polysaccharides from grape, yeast, bacteria or oak: -

    25. Astringency: sensory interferences Strong influence of Acidity (+), sulphur, chemical and herbaceous aromas (+) Note again: + means the intensity evolves in the same way. They are not necessarily interesting attributes

    26. Dryness: main compounds involved Ethanol: - until 13%vol, + over 13%vol Sugar: 0 Grape Tannins and Oak Tannins: + Acids, mostly malic and acetic: + Sulphur, chemical and herbaceous aromas (+) Certain volatile compounds (those who give ripe, fruity, spicy aromas) : - (physiological and psychological reasons) Yeast in suspension (wine just stirred): + Polysaccharides from grape, yeast, bacteria or oak: -

    27. Dryness: sensory interferences Strong influence of Acidity (+), Sulphur, chemical and herbaceous aromas (+)

    28. Bitterness: main compounds involved Ethanol: + (amplifies the impact of bitter compounds) Sugar:- Grape Tannins and Oak Tannins: + Acids (mostly the malic acid) : + Sulphur aromas: ++ Certain volatile compounds (those that give ripe, fruity, spicy aromas) : - (physiological and psychological reasons) Yeast in suspension (wine just stirred): + Polysaccharides from grape, yeast, bacteria or oak: -

    29. Bitterness: sensory interferences Strong influence of Acidity: +, Sulphur, chemical and herbaceous aromas: +

    30. Winemaking challenges Analysis of the situation: High risks of sulphur aromas produced by the yeast because of low nutrients and high osmotic shock: producing dryness and bitterness sensations High ethanol enhancing dryness and bitterness Strategy to follow: Developp and stabilize as much as possible all elements that limit dryness and bitterness: polysaccharides and compounds with ripe aromas Limit as much as possible the production and stabilization of all agressive (astringency and dryness) and bitter compounds Explore all possibilities and make consistent choices throughout the process

    32. Chardonnay simplified profiles Complete maturity : Goals to be reached to achieve return on investment on strong enological potential vineyard blocks. To elaborate higher end wines with foremouth volume, aromatic complexity, good length. Ability to be fermented and aged in barrel. Minimum commercial maturity Goals to be reached for mid range vineyard blocks. Fruity wines, without agressive mouthfeel.

    33. Chardonnay simplified profiles

    34. Maceration enzymes: main influences (1) Direct hydrolysis of polysaccharides (pulp and skin): early, greater level of stable macromolecules in the colloidal network, and then more interesting interactions with ripe aromas Early liberation of the sensorically interesting tannins: the hydrophiles ones. In ripe grapes, they are already integrated in a polysaccharide colloidal matrix: early stabilization in a less sensory aggressive form (medium-length chain)

    35. Maceration enzymes main impacts (2) Direct action on limiting sulphur off- flavour production during fermentation: a clear experimental trend (Why? Earlier yeast access to certain nutrients? Early interaction between sulphur compounds and grape polysaccharides?) Indirect action on sulphur off-flavours and herbaceous aromas: easier and more efficient racking directly after maceration, with good and early elimination of heavy vegetal lees

    37. Effects of maceration enzymes on mouthfeel profiles in reds. ICV Guideline based on 15 years experimentation and experience

    38. Yeast main possible impacts: selected enological yeast variability (1) Better resistance to juice stress (high sugar, very low nutrients, high ethanol) Less production of sulphur compounds Less production of VA Less space left for Brettanomyces and Co developpment at the end of fermentation Better answer to modern demands Less SO2 production, giving a better sequence of malolactic directly after alcoholic fermentation

    39. Yeast main possible impacts: selected enological yeast variability (2) More mannoprotein produced during active fermentation and during aging with light lees: Earlier development of a stable wine colloidal network (polysaccharides + pigments + tannins) More and early interactions with ripe aroma compounds from the grapes and from the yeast (more stable and sweeter aromatic expression) Better sensory integration of very high ethanol concentration

    41. Possible trends between selected yeast in reds. ICV guideline based on 20 years of experiments and experience

    42. Yeast Nutrients possible impacts : nutrients containing inactivated yeast Better complete nutrient and yeast membrane status: Less production of sulphur compounds (because there is no enhancement of amino acid starvation in nitrogen-depleted juices : the opposite of the situation when only ammonia salts are added) Less production of VA Release of yeast mannoproteins: Balance the chemical aromas and dryness due to the assimilation of ammonia salts Better sensory integration of very high ethanol concentrations

    44. Effects of Yeast Nutrients on Mouthfeel profiles in reds. ICV guideline based on 10 years of experiments and experience

    52. Early Dlestage main impacts (1) More liberation of grape polysaccharides (pulp and skin): early and higher level of stable macromolecules in the colloidal network, and also greater interaction with ripe aromas Early and intense liberation of the most sensorically interesting tannins: the hydrophilic ones. In ripe grapes, they are already integrated in a polysaccharide colloidal matrix: early stabilization in less sensory agressive forms (medium length chain)

    53. Early Dlestage main impacts (2) Direct action on limiting sulphur off- flavour production during fermentation: complete yeast stirring, oxygen available for all yeast, physical stripping of early production of H2S

    55. Effects of Dlestage on Mouthfeel profiles in mediterranean reds. ICV Guideline based on 10 years experimentation and experience

    57. Common sense statements A well positioned wine answers its segment standards as soon as released : a minimum drinkability. The good to drink starting 2015-2030 is an ultra small niche position.

    58. Common sense statements (2) Ageability is a segmented concept : mid priced wine from rather high yield vines : get the maximum quality attributes at release keep a certain quality level through the whole shelf life high priced wine from highly concentrated grapes get an acceptable level of drinkability at release develop positive attributes through time

    60. Sulphur compounds Always interfering with the perception of fruit characters : aromas and flavors Sulphur off-flavors are forever ! Always changing but still there Reduction never preserves your wine from oxidation and too quick aging. Big sensory synergy with Atypical Aging

    61. Macromolecules Mostly polysaccharides From grapes From yeast (while living and during aging on lees) From bacteria Some are very chemicaly stable : RGII, mannoproteins, glucans. Participating in interactions (non classical chemical bindings) with many important compounds. Starting in the grape : ultimate hypothesis for tannin ripening in the grape

    62. Some winemaking trends to get ageability (1) The sources of grape polysaccharides : First : ripe pulp Second : ripe skin Seeds ? Get grape and yeast polysaccharides in the juice before or while reactive compounds are extracted and may react too much. The goal : to avoid excessive polymerization of tannins. Enological enzymes on fresh grapes Diffusion with little alcohol in reds Avoid mechanical extraction : favour diffusion of easy to diffuse polysaccharides

    63. Some winemaking trends to get ageability (2) Take polysaccharides from yeast as much as possible While living = choose the right strains While dead = stirring. Start during active fermentation. Note : Some strains do not bring interesting ageability polysaccharides Take polysaccharides from MLB. To keep fruit : better effect than some grams of malic acid. Better prevention of AA (atypical aging)

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