International audienceFive mixtures of milk and pea protein (0-40 g pea protein/100 g total protein) were fermented by ten starter cultures of lactic acid bacteria (LAB)(2) to select the cocktails that can lead to products similar to a conventional yoghurt. Generally speaking, an increase in pea concentration leads to products with higher acidity, higher syneresis and lower firmness. From the sensory perspective, up to 30 g pea protein/100 g total protein, starter cultures show either positive or negative effects. A principal component analysis (PCA)(3) and a hierarchical cluster analysis (HCA)(4) carried out on all variables revealed five groups of products. Two groups of products of 0 g or 10 g pea protein/100 g total protein seemed to be the most similar to conventional dairy products. The third group included products fermented with two starters with negative characteristics such as astringency and bitterness. The last two groups included members made of 10 g, 20 g, 30 g and 40 g pea protein/100 g total protein, among them one group showing a positive sensory profile. From this group, four starter cultures seem promising for the fermentation of milk and pea protein mixtures
Ten starter cultures of lactic acid bacteria were used to ferment five mixtures of milk and pea protein (0%, 10%, 20%, 30% and 40% of pea) to select the cocktail that can lead to products similar to traditional yogurt. Product quality evaluation was performed by comparing the sensory profile of 49 formulated products with the profile of a milk fermented by commercial lactic ferments. The sensory profiles were analyzed by means of three-way ANOVAs and a principal component analysis (PCA). Substitution of cow milk protein with 40% of pea proteins reduce starter cultures effects and decrease product quality. In contrast, until 30% of pea protein, starter cultures show positive and negative effects. For example, products fermented by Streptococcus thermophilus + Lactobacillus acidophilus with 30% pea protein have positive characters like creamy and smooth, but Lactobacillus delbrueckii subsp. Bulgaricus + Lactobacillus rhamnosus caused bad quality and negative characters like bitter and astringent even with 100% cow milk.
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