Xylanase production through solid state fermentation and
zymogram analysis
Initially, experiments were set to determine the time when
A. lentulus showed highest xylanase production in solid state
fermentation using wheat bran as the substrate and yeast extract as
the nitrogen source. The time profile showed a gradual increase in
xylanase production from 24 h (2.1 U/g) to 72 h (76.3 U/g) which
reached its maximum value after 96 h (135.9 IU/g). After this the
activity started to decline (123.3 U/g after 120 h) exhibiting 90.3 U/g
activity after 144 h of incubation.Zymogram analysis of the partially purified enzyme extract of
A. lentulus grown on wheat bran is given in Fig. 1a. Lane AeE represents
the protein markers (18.4, 20.1, 43.0, 67.0, 240.0 KDa in size)
obtained after the Coomassie Brilliant Blue R-250 staining of the
gel. Lane F represents the zymogram of the partially purified
enzyme obtained after Congo Red staining. The molecular weight of
the active enzyme, as calculated using the Rf value (Fig 1b) was