Technological, rheological and sensory characterizations of a yogurt containing an exopolysaccharide extract from Lactobacillus fermentum Lf2, a new food additive

YANINA PAVON; NORA AIMARETTI; ANA G. BINETTI; YANINA PAVON; NORA AIMARETTI; ANA G. BINETTI; MARCOS PEREZLINDO; SILVIA COSTA; JORGE REINHEIMER; MARCOS PEREZLINDO; SILVIA COSTA; ELISA ALE; JORGE REINHEIMER; D.M.GUGLIELMOTTI; CARINA BERGAMINI; ELISA ALE; D.M.GUGLIELMOTTI; CARINA BERGAMINI

FOOD RESEARCH INTERNATIONAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 90 p. 259 - 267

0963-9969

Lactobacillus fermentum Lf2, an autochthonous strain isolated as a non starter culture in Cremoso cheese, produceshigh EPS levels (~1 g/L) in optimized conditions (SDM broth, pH 6.0, 30 °C, 72 h). Technological (textureprofile and rheological analysis) and sensory properties of non-fat yogurts with 300 and 600 mgEPS/L were studiedat 3 and 25 days after manufacture. Yogurtswith different EPS concentrations showed higher hardness valuesthan the control group at both periods of time, being the only significant difference that remained stable duringtime. The consistency index was also higher for the treated samples at both times evaluated, being significantlydifferent for samples with 300 mg/L of EPS extract, while the flow behavior index was lower for EPS-added yogurts.The thixotropic index was lower (P b 0.05) for samples with the highest EPS extract concentration at theend of the storage time. Regarding the sensory analysis, those yogurts with 600 mg/L of EPS extract presentedthe highest values of consistency at 3 days of storage. No considerable differences for defects (milk powder,acid, bitter and cooked milk flavors) were perceived between treated and control samples at both times evaluated.Syneresis was also studied and sampleswith 600 mg/L of EPS extract presented the lowest syneresis values at25 days of storage, which considerably decreased with the time of storage.In conclusion, the EPS from L. fermentum Lf2, used as an additive, provided yogurt with creamy consistency andincreased hardness, without the presence of unwanted defects and improving the water holding capacity of theproduct. All the analysis done showed the potential of this extract to be used as a technofunctional natural ingredient,and it should be considered its positive impact on health, according to previous studies.