SPECIAL SECTION : Food Biotechnology

Prebiotic Activity of Xylooligosaccharides from Corncob

Lorena Pedraza, Héctor Toribio, Rebeca Romo, Silvana Arreola, Mirely Guevara

ABC2456A12

Prebiotics are substances that promote the growth of beneficial microorganisms (probiotics) inthe gut. Probiotics are microorganisms such as bacteria or yeast that is believe to improve health.The xylooligosaccharides (XOS) are a type of prebiotic substances, these compounds are oligomers formed by xylose units and can be obtained by enzymatic hydrolysis of xylan. In this work the xylan was obtained through thermochemical pretreatment of the corncob, which is a by-product from corn processing. To analyse the prebiotic activity of XOS obtained from corncob and reagent grade xylan, they were tested in L. brevis, L. plantarum, L. acidophilus, L. rhamnosus cultures, and in a co-culture with Escherichia coli as a challenge microorganism to prove the bacteriostatic activity of lactobacilli strains.Xylooligosaccharides stimulated L. brevis and L. plantarumgrowth: these microorganisms grew faster than the other lactobacilli strains. L. acidophilus grew better in the presence of XOS and maintained the absorbance of the culture.biotec

In the co-culture in presence of both XOS the challenge microorganism did not grow; lactobacilli colonies appeared in MRS agar. No colonies of E. coli grew in EMB plaques.

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Journal of Chemical, Biological and Physical Sciences