In previous studies, 5.0 mg/mL aqueous dextran from Pediococcus pentosaceus and L. mesenteroides NRRL B-640 have shown non-Newtonian pseudoplastic behavior when shear rates of 0.05-500 [s.sup.-1] and 0.1-1000 [s.sup.-1] were applied, respectively [14,15].
confusa R003 dextran was composed of 2.6% [alpha] (1 [right arrow] 3) branch linkages while L. mesenteroides NRRL B-640 was a linear chain of [alpha] (1 [right arrow] 6) linkages.
The molecular weight of 1.0 x 10 kDa correlates with previous reports of some dextrans produced from LAB such as L. mesenteroides KIBGE-IB22 and its mutant strain L.
To study the growth kinetics of L. mesenteroides (V1)in pure and mixed cultures with the alterations and/or pathogens strains (Staphylococcus aureus ATCC 43300, Listeria inocoua ATCC 33090 and Listeria ivanovii ATCC 19119).
L. mesenteroides strains were cultured in MRS broth at 30[degrees]C for 18h and were then adjusted to a 0.5 McFarland scale and smeared homogeneously on MRS culture plate.
This result are in agreement with by , The L. mesenteroides strain Z8 isolated from Algerian camel milk was not viable at pH 2, but marked an increases of 7.49% and 2.43% at pH3 and 4, respectively and according to other authors for other probiotic strains,  The strains of Pediococcus acidilactici (P2), Lactobacillus curvatus (RM10), and P.
On the other hand, definite esterase activity was observed for L. mesenteroides
"We showed that L. mesenteroides
starts the fermentation process in the root mass, which then creates a pathway for other organisms to come in and cause spoilage,"Strausbaugh says.
Model for predicting infection by L. mesenteroides
Besides finding a way to quickly identify microbes whose enzymes prodigiously produce alternan, the scientists have identified improved strains of L. mesenteroides. And they have identified bacteria and enzymes that break down alternan.
Leathers has found that an abundant coproduct of ethanol--corn condensed distillers' solubles, or CCDS--works as well as much more costly materials as a nutrient for L. mesenteroides. Now, CCDS, which sells at about 2 cents per pound, is put in animal feeds.
From an L. mesenteroides strain, the researchers hope to clone the gene responsible for producing alternan and to genetically engineer another microorganism to produce greater quantities of the enzyme.