Probiotic Milk Enriched with Protein Isolates: Physicochemical, Organoleptic, and Microbiological Properties (2024)

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Probiotic Milk Enriched with Protein Isolates: Physicochemical, Organoleptic, and Microbiological Properties (1) https://doi.org/10.3390/foods13193160 · Probiotic Milk Enriched with Protein Isolates: Physicochemical, Organoleptic, and Microbiological Properties (2)

Journal: Foods, 2024, №19, p.3160

Publisher: MDPI AG

Authors: Małgorzata Pawlos, Katarzyna Szajnar, Magdalena Kowalczyk, Agata Znamirowska-Piotrowska

Abstract

Incorporating plant protein isolates into milk can enhance probiotic culture growth by providing essential nutrients and altering the physicochemical properties of fermented milk. This study investigated the effects of adding 1.5% or 3.0% soy, pea, and whey protein isolates on the growth of Lacticaseibacillus casei and Lactobacillus johnsonii monocultures, as well as the physicochemical (acidity, syneresis, color) and organoleptic properties of fermented milk during 21 days of refrigerated storage. The results showed that 1.5% SPI and WPI did not significantly alter milk acidity compared to controls. Still, pH increased with 1.5% and 3.0% PPI. Storage time significantly affected pH in L. casei fermented milk. The initial addition of WPI at 1.5% and 3.0% reduced syneresis in L. casei fermented milk compared to other samples. Color components were significantly influenced by isolates. Initial L. casei cell counts were lower with SPI (LCS1.5 and LCS3) and 1.5% PPI (LCP1.5) compared to controls. Increasing isolate concentration from 1.5% to 3% enhanced L. johnsonii growth in WPI-milk but reduced L. casei in LCW3 compared to LCW1.5. Only increased pea protein concentration significantly increased L. casei growth. Probiotic populations generally were reduced during extended storage. Moreover, isolates impacted milk organoleptic evaluation. This research demonstrates the potential of protein isolates in creating health-promoting and diverse fermented products and offers insights into their interaction with probiotic cultures to advance functional food technologies.

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Probiotic Milk Enriched with Protein Isolates: Physicochemical, Organoleptic, and Microbiological Properties (2024)
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