ArticleSoapy Taste, Wine Pumps, and Testing SulfiteWritten by Alison CroweI suspect you’ve got a fatty acid issue caused by your stuck/sluggish fermentation. S. cerevisiae can emit fatty acids when under fermentive stress . . .Already a member? Log InYou'll Also Like Article MEMBERS ONLY Late Malolactic, Wine Kit Ingredients, and Color Questions Your Zinfandel probably had a good reason (in the wine’s opinion, anyway) why it didn’t go through ML fermentation. Article MEMBERS ONLY Avoiding Sulfites, Adding Copper Pasteurization operates on a sliding scale and its effectiveness depends on a coefficient between time and temperature.