Effect of high and low acyl gellan on growth parameters of Lactobacillus delbrueckii
DOI:
https://doi.org/10.24054/limentech.v21i2.2608Keywords:
High and low acyl gellan, Huang model, Gompertz model, ViscoelasticityAbstract
The aim of this study was evaluate the growth parameters of Lactobacillus delbrueckii in viscoelastic system made from gellan gum. Initially dispersions of high (HAG), low acyl gum (LAG) and their mixture HAG/LAG at 5 % w/v were incorporated with inulin and gelled by calcium ions addition. The viscoelastic study of these systems was performed through dynamic oscillatory. The counts of L. delbrueckii grown on gellan systems were adjusted to Huang and Gompertz models in order to determinate the growth parameters. All gellan systems studied showed a predominantly elastic behavior, where the elastic modulus (G’) was greater than viscous modulus (G’’). G’ is inversely proportional to maximum growth rate. HAG and LAG had significant effect mainly on latency phase and growth rate, while no influence was observed for initial count cells (Y0) and final count cells (Ymax) parameters. The high value of growth rate found on HAG system indicate that L. delbrueckii grows faster at HAG than LAG and HAG/LAG systems. These findings can be useful to develop new alimentary products.
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