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The effect of inulin addition and starters (Kefir grains or commercial starter culture) on the microbial viability, texture, and chemical characteristics of Kefir beverages prepared with whole or skim milk was evaluated during refrigerated storage. The type of starter did not influence microbial viability during the storage of the beverages, but the chemical and textural changes (decreases in pH, lactose concentration, and inulin and increased acidity, firmness, and syneresis) were more pronounced in the formulations fermented with grains than those fermented with the starter culture. The addition of inulin did not influence acidity or viability of lactic acid bacteria, but in general, its effect on the survival of acetic acid bacteria, Lactococcus and yeasts, firmness, and syneresis depended on the type of milk and starter culture used. Generally, the yeast, acetic acid bacteria, and Leuconostoc counts increased or remained unchanged, while the total population of lactic acid bacteria and Lactococcus were either reduced by 1 to 2 logs or remained unchanged during storage.

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The aim of this study was to develop a gluten-free fresh pasta formulation with addition of yellow passion fruit peel flour (PPF). A control formulation containing a mixture of rice flour and corn flour and formulations with 10 and 20% of PPF addition were produced. Sensory analysis, physicochemical characterization and technological properties were assessed. The PPF addition to gluten-free pasta increased cooking time, soluble solids loss and water absorption; it also modified the color of the formulations. The control formulation and the formulation containing 10% PPF had the best sensory parameters, leading to an acceptability index over 70%. The 10% PPF addition increased fiber (3.25%) and ashes (2.15%) content and also lowered percentage of carbohydrates (41.19%) and energy value (223.26 kcal/80g); content of proteins and lipids were similar between the formulations. Principal component analysis showed that the control formulation stands out due to its sensory properties while the formulation containing 10% PPF improved nutritional properties. Therefore, the increase in nutritional value of gluten-free fresh pasta due to the PPF addition can be considered an alternative to meet market demands for healthier food choices.