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3.1. Isolation, phenotypic characterization and identification ofacetic acid bacteriaOne of the most abundant prokaryotes cells in traditionalkombucha is AAB family which responsible for GlcUA and microbialcellulose membrane producing. Thereby, our experiments aimed toobtain AAB with the ability of GlcUA production for further functionalfood applications. Four bacterial strains which showed gramnegative,rod shape, transparent and round colonies were screenedfor their behaviors in different culture mediums (Table 2). Only twostrains (AAB2, AAB3) showed both abilities of microbial celluloseand glucuronic acid production then they were sequenced. Thecomparisons of sequenced nucleotide of these bacteria gave in thesame name of Gluconacetobacter intermedius then was coded as G.intermedius KN89. Our results agreed with those have been reportedin other studies.In many kombucha samples from Canada, UK, and US, Gluconacetobacterfamily was found to be predominant over 85% inpopulation of acetic acid bacteria (Marsh, Sullivan, Hill, Ross, &Cotter, 2014). G. intermedius has been used in a wide range offood, industrial and pharmaceutical applications since it is not onlyknown as high ethanol and acetic acid tolerance but also as anexopolysaccharide, nanofibrillated cellulose, and glucuronic acidproducer (Kose, Sunagawa, Yoshida, & Tajima, 2013). Therefore,G. intermedius KN89 gathers enough useful characteristics to becombined with yeast strain for glucuronic acid production in ourfurther designed experiment.
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