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Changes in Selected Quality Indices in Microbially Fermented Commercial Almond and Oat Drinks

(1) Background: Interest in plant analogues for food of animal origin is increasing. There are some pro-healthy food ingredients, such as odd-chain, cyclic, and branched fatty acids, that are perceived to be characteristic for food of animal origin or fermented. The purpose of the present study was to determine whether commercial plant drinks can be valuable nutrient mediums for the multiplication of lactic acid bacteria and yeasts. The goal was also to determine their potential for the production of the above-mentioned groups of fatty acids; (2) Methods: Commercial almond and oat beverages were used to produce 16 new variants of fermented beverages using 3 strains of lactic acid bacteria and 5 strains of yeasts. The apparent viscosity, volatile compounds (e-nose), and fatty acids composition (GC-MS) were analyzed; (3) Results: After 48 h of fermentation, acidity increased in both types of drinks. The gelation of proteins in the majority of the almond beverages increased the apparent viscosity. The highest content of minor fatty acids was determined in oat beverages fermented by Lactiplantibacillus plantarum PK 1.1 and Kluyveromyces marxianus KF 0001 and in the almond beverage fermented by Candida lipolytica CLP 0001. Among the used strains, Yarrowia lipolytica YLP 0001 was found to be a major producer of aromas in both beverages.