title: Cultural condition affecting the growth and production of beta-galactosidase by Bifidobacterium longum CCRC 15708 in a jar fermenter.
abstract: In the present study, the growth and production of beta-galactosidase by Bifidobacterium longum CCRC 15708 in a 5-L jar fermenter as influenced by cultivation temperature (27-42 degrees C), medium pH (4.5-7.5) and agitation speed (5-200 rpm) were evaluated. In general, it was found that a cultivation temperature of 37 degrees C proved optimal for both growth and beta-galactosidase production by the test organism. Although the growth of the test organism was the highest in the culture with pH controlled at 4.5-6.5, the culture with pH controlled at 6.5 resulted in the highest production of beta-galactosidase. Further, agitation at 100 rpm or more was found to enhance both the growth and production of beta-galactosidase. Fermentation conducted in a jar fermenter having the pH of the culture medium, the cultivation temperature, and the agitation speed controlled at 6.5, 37 degrees C, and 100 rpm, respectively, a maximum beta-galactosidase activity of 36.7 U/ml and a maximum transgalactosylation activity of 0.49 U/ml was achieved in 10 h of fermentation. There are ca 2.0 and 12.3 fold greater than the reported maximum beta-galactosidase and transgalactosylation activity, respectively, produced by B. longum CCRC 15708 in a flask culture system.
authors.affiliation: Graduate Institute of Food Science and Technology, National Taiwan University 59, lane 144, Keelung Rd., Sec. 4, Taipei, Taiwan.
authors.forename: C A
authors.initials: CA
authors.lastname: Hsu
authors.forename: R C
authors.initials: RC
authors.lastname: Yu
authors.forename: S L
authors.initials: SL
authors.lastname: Lee
authors.forename: C C
authors.initials: CC
authors.lastname: Chou
mesh_terms: D001644:Bifidobacterium / Q000201:enzymology* / Q000254:growth & development*; D015169:Colony Count, Microbial; D003470:Culture Media / Q000737:chemistry*; D005285:Fermentation; D005516:Food Microbiology; D006863:Hydrogen-Ion Concentration; D019936:Probiotics; D013696:Temperature; D001616:beta-Galactosidase / Q000096:biosynthesis*
chemical_list: D003470:Culture Media; D001616:beta-Galactosidase