Fermentation of wheat bran with lactic acid bacteria is a
promising strategy to usefully incorporate wheat bran in bread
through a technologically simple pre-treatment procedure. However,
particle size reduction appears to be a key requirement to
reduce haptic problems such as grittiness that were perceived as
highly problematic with unprocessed wheat bran. Although particle
size reduction was also reported to be detrimental for baking
performance, especially concerning loaf volume and dough stability
(Noort et al., 2010), such effects can be partially compensated for
by pre-moistening of bran (Lai et al., 1989). Our study implies that
pre-moistening positively influences factors like bread loaf volume,
phytate and (bitter) alkylresorcinol contents and increases the
levels of free phenolic acids. However, moist incubation also increases
the risk of microbial spoilage, and a tailored fermentation
step is beneficial to repress the development of contaminating
microorganisms.
While our results provide an interesting view on the carbohydrate
metabolism of the included strains, sensory description did
not show clear differences in perceived bitterness and bran specific
aftertaste. In agreement with previous findings and based on statistical
analyses, we hypothesize that acetic acid as produced by
obligately heterofermentative species (L. sanfranciscensis, L. brevis)
could have an influence on perceived bitterness/aftertaste, and
further investigation in this regard is warranted. We conclude that
in addition to more traditional sourdough species such as
L. sanfranciscensis and L. brevis, also the facultatively heterofementative
species L. plantarum and L. pentosus possess potential
for industrial wheat bran fermentations and should be considered
in further investigations
Fermentation of wheat bran with lactic acid bacteria is apromising strategy to usefully incorporate wheat bran in breadthrough a technologically simple pre-treatment procedure. However,particle size reduction appears to be a key requirement toreduce haptic problems such as grittiness that were perceived ashighly problematic with unprocessed wheat bran. Although particlesize reduction was also reported to be detrimental for bakingperformance, especially concerning loaf volume and dough stability(Noort et al., 2010), such effects can be partially compensated forby pre-moistening of bran (Lai et al., 1989). Our study implies thatpre-moistening positively influences factors like bread loaf volume,phytate and (bitter) alkylresorcinol contents and increases thelevels of free phenolic acids. However, moist incubation also increasesthe risk of microbial spoilage, and a tailored fermentationstep is beneficial to repress the development of contaminatingmicroorganisms.While our results provide an interesting view on the carbohydratemetabolism of the included strains, sensory description didnot show clear differences in perceived bitterness and bran specificaftertaste. In agreement with previous findings and based on statisticalanalyses, we hypothesize that acetic acid as produced byobligately heterofermentative species (L. sanfranciscensis, L. brevis)could have an influence on perceived bitterness/aftertaste, andfurther investigation in this regard is warranted. We conclude thatin addition to more traditional sourdough species such asL. sanfranciscensis and L. brevis, also the facultatively heterofementativespecies L. plantarum and L. pentosus possess potentialfor industrial wheat bran fermentations and should be consideredin further investigations
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