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Murli Dharmadhikari Iowa State University Katie Cook University of Minnesota

Optimizing winemaking for Northern Grapes. Murli Dharmadhikari Iowa State University Katie Cook University of Minnesota Anna Katharine Mansfield Cornell University. Objectives.

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Murli Dharmadhikari Iowa State University Katie Cook University of Minnesota

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  1. Optimizing winemaking for Northern Grapes MurliDharmadhikari Iowa State University Katie Cook University of Minnesota Anna Katharine Mansfield Cornell University

  2. Objectives • Develop and optimize winemaking practices to sustainably produce and market distinctive, high quality wines from cold climate cultivars. • Optimize sensory profile • Acid reduction • Suppress hybrid notes • Balance tannin profiles • Varietal vs. regional? Wild riparia, Chaska, MN

  3. Yeast trials

  4. Aromatic whites • Edelweiss & La Crescent • Impact of processing on volatile extraction • duration of skin contact • enzyme treatment

  5. Red wine tannins • Frontenac & Marquette • Polyphenolic characterization • Enological additive trials

  6. Acid management • Physiobiologicaldeacidification • Marquette & Frontenac • malate-reducing yeast strains • amelioration • Frontenac gris & La Crescent • ratable blends of MLF and non-MLF • amelioration

  7. Acid management • Revisiting “Double-salt” deacidification • La Crescent, Frontenac gris, Frontenac rosé • Pre- and post-fermentation ‘double-salt’ • Preferential malic reduction? • Cross-regional optimization trials

  8. Acid management Acid reduction kinetics in model wine solutions with varying malic: tartaric ratios

  9. ‘hybrid’ aroma • Characterize non-methoxypyrazine ‘green’ compounds in hybrid grapes • GCO/MS characterization in ‘extreme’ wines • use recombination trials to positively identify compounds

  10. Sensory evaluation • Consumer preference testing • R-index • Characterization by trained panels • Projective mapping • Descriptive analysis • Informal industry tastings

  11. Investigators MurliDharmadhikari, Iowa State University Katie Cook, University of Minnesota Anna Katharine Mansfield, Cornell University

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