Abstract
After the appearance of “Etudes sur le vin” by Pasteur, in enology lactic acid bacteria have been considered as deteriorating agents for more than 50 years. About 1920, Ferré in Burgundy and Ribéreau-Gayon in Bordeaux demonstrated the enological importance of the transformation of malic to lactic acid. This notion is now generally accepted in most vinicultural areas. Malolactic fermentation is encouraged, especially for red wines, for two reasons: a) it eliminates the taste of malic acid and lowers the acidity of the wine, b) it assures the biological stability of wines conserved with a minimum of sulphurous anhydride.
In traditional vinification, malolactic fermentation is the result of bacterial growth. It is spontaneous, that means induced by the endogenous lactic acid bacteria of grapes and winery equipment. In the must, yeasts and bacteria develop simultaneously; in the antagonism between yeasts and bacteria the bacterial population is more often becoming dominant than being suppressed. The grapes are sulphited so that bacterial growth occurs only after complete exhaustion of sugars by the yeasts. Consequently, alteration of the wine, as a result of sugar fermentation by the bacteria, is prevented. In a well-controlled vinification lactic acid bacteria can complete their growth cycle in the wine. Wine, however, is a poor culture medium and the bacteria multiply under restricted nutritional, physical and chemical conditions. As a consequence, malolactic fermentation is difficult to control in practice, in spite of all the research done for more than 30 years.
For a long time, one has tried to stimulate malolactic fermentation by inoculating wine with bacteria. Until now, the problem has been to determine the biomass of bacteria, sufficient for fermentation to take place as well as the quality required. The desired physiological state of the bacteria in the inoculum is also not known.
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Lafon-Lafourcade, S., Lonvaud-Funel, A. & Carre, E. Lactic acid bacteria of wines: stimulation of growth and malolactic fermentation. Antonie van Leeuwenhoek 49, 349–352 (1983). https://doi.org/10.1007/BF00399509
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DOI: https://doi.org/10.1007/BF00399509