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Chemical and biochemical bleaching of oat hulls : The effect of hydrogen peroxide, laccase, xylanase and sonication on optical properties and chemical composition

Schmitz, Eva LU ; Francis, Juanita ; Gutke, Katarina ; Nordberg Karlsson, Eva LU orcid ; Adlercreutz, Patrick LU orcid and Paulsson, Magnus (2021) In Biotechnology Reports 30.
Abstract

Oat hulls are an excellent dietary fibre source for food supplements due to their rich lignocellulose composition as well as their great abundance as low-value agricultural side stream. For the production of white fibre supplements, a mild, but effective bleaching of the hulls is required. Chemical bleaching with hydrogen peroxide and sodium hydroxide was here found to be a suitable method increasing the CIE L* value (corresponds to a lightness value) above 85. The developed method is mild, retaining the hull's chemical composition. Only a minor decrease in coniferaldehyde structures upon bleaching was detected. Colour and chemical variabilities of oat hulls from different growth seasons did not influence the required bleaching... (More)

Oat hulls are an excellent dietary fibre source for food supplements due to their rich lignocellulose composition as well as their great abundance as low-value agricultural side stream. For the production of white fibre supplements, a mild, but effective bleaching of the hulls is required. Chemical bleaching with hydrogen peroxide and sodium hydroxide was here found to be a suitable method increasing the CIE L* value (corresponds to a lightness value) above 85. The developed method is mild, retaining the hull's chemical composition. Only a minor decrease in coniferaldehyde structures upon bleaching was detected. Colour and chemical variabilities of oat hulls from different growth seasons did not influence the required bleaching conditions to achieve the desired optical properties. The inclusion of biochemical bleaching steps utilizing the xylanase Pentopan Mono BG, the laccase NS51003 and sonication was industrially not feasible as they could not reduce the required amount of subsequently applied bleaching chemicals significantly.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biobleaching, Chemical bleaching, Dietary fibre, Enzymes, Hydrogen peroxide, Oat hulls
in
Biotechnology Reports
volume
30
article number
e00624
publisher
Elsevier
external identifiers
  • pmid:34123735
  • scopus:85107827151
ISSN
2215-017X
DOI
10.1016/j.btre.2021.e00624
language
English
LU publication?
yes
id
7d1a90a0-06ce-4ca6-9dd3-c9e0a7469541
date added to LUP
2021-06-28 14:24:21
date last changed
2024-04-20 08:03:30
@article{7d1a90a0-06ce-4ca6-9dd3-c9e0a7469541,
  abstract     = {{<p>Oat hulls are an excellent dietary fibre source for food supplements due to their rich lignocellulose composition as well as their great abundance as low-value agricultural side stream. For the production of white fibre supplements, a mild, but effective bleaching of the hulls is required. Chemical bleaching with hydrogen peroxide and sodium hydroxide was here found to be a suitable method increasing the CIE L* value (corresponds to a lightness value) above 85. The developed method is mild, retaining the hull's chemical composition. Only a minor decrease in coniferaldehyde structures upon bleaching was detected. Colour and chemical variabilities of oat hulls from different growth seasons did not influence the required bleaching conditions to achieve the desired optical properties. The inclusion of biochemical bleaching steps utilizing the xylanase Pentopan Mono BG, the laccase NS51003 and sonication was industrially not feasible as they could not reduce the required amount of subsequently applied bleaching chemicals significantly.</p>}},
  author       = {{Schmitz, Eva and Francis, Juanita and Gutke, Katarina and Nordberg Karlsson, Eva and Adlercreutz, Patrick and Paulsson, Magnus}},
  issn         = {{2215-017X}},
  keywords     = {{Biobleaching; Chemical bleaching; Dietary fibre; Enzymes; Hydrogen peroxide; Oat hulls}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Biotechnology Reports}},
  title        = {{Chemical and biochemical bleaching of oat hulls : The effect of hydrogen peroxide, laccase, xylanase and sonication on optical properties and chemical composition}},
  url          = {{http://dx.doi.org/10.1016/j.btre.2021.e00624}},
  doi          = {{10.1016/j.btre.2021.e00624}},
  volume       = {{30}},
  year         = {{2021}},
}