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Metschnikowia fruticola
For managing spoilage risks during cold soak of reds Pre-fermentation cold soaks are used to improve color and aromatics in all red varieties. Vincent Gerbeaux of the Institut Francais de la Vigne et du Vin (IFV) in Burgundy selected Metschnikowia IFV Gaia MF98.3 from over 500 non-Saccharomyces isolates for use during cold soak applications, in particular on Pinot Noir. This strain is found on grape microflora and is non-fermentative but it does help with the balance of aromas. It has been found to enhance fruity characters and aromatic expression. The presence of Gaia MF98.3 during cold soak helps limit Kloeckera apiculata growth and acetic acid production. Kloeckera apiculata (Hanseniaspora uvarum) is known to be a high producer of acetic acid and ethyl acetate. Early inoculation allows for good implantation of Gaia MF98.3 which can help control undesirable flora during cold soak. It is able to implant and multiply rapidly helping it to prevail over spoilage microorganisms. Use of Gaia MF98.3 needs to be followed by a S. cerevisiae strain to complete alcoholic fermentation. If the temperature of your cold soak is 10°C(50°F) or lower you may cold soak for up to 5 days before adding your Saccharomyces yeast. If the temperature of your cold soak is higher than 10°C(50°F), inoculation of your Saccharomyces yeast should be done at 2 days. Gaia MF98.3 is able to grow in low pH and high sugar musts as well as being able to tolerate an initial SO2 addition up to 50ppm.
Rehydration of Gaia MF98.3 is done at 30°C(86°F) and does not require a rehydration nutrient. Inoculate at 25g/hL (2lb/1000gal). After 15 minutes, stir gently. Slowly combine an equal amount of juice into rehydration solution to avoid cold shock. Total rehydration time should not exceed 45 minutes. After cold soak, add selected Saccharomyces cerevisiae with standard yeast rehydration protocol. Use of Gaia needs to be followed by a strain to complete alcoholic fermentation. Storage Store for up to 24 months at 4°C(39°F). Use immediately once opened.