Explain the enzymatic processes involved in cold soaking and their effect on wine aroma precursors.

Cold soaking, also known as pre-fermentation maceration, involves holding crushed red grapes at a low temperature (typically 4-15°C) for several days before the onset of alcoholic fermentation. During this period, several enzymatic processes occur, impacting the extraction of aroma precursors and other phenolic compounds. Pectic enzymes, naturally present in grape skins, are active during cold soaking. These enzymes break down pectin, a structural component of plant cell walls. By degrading pectin, the cell walls become more permeable, facilitating the release of anthocyanins (color pigments) and aroma precursors from the grap....