Microbial and enzymatic modification of wheat bran properties at reduced water content

Outi Santala, Pekka Lehtinen, Emilia Selinheimo, Kati Katina, Kaisa Poutanen

Research output: Contribution to journalOther journal contributionScientific

Abstract

Cereal bran is high in dietary fibre and a good source of health promoting compounds. Enzymatic or microbiological methods offer means to improve the technological properties of bran. Water content is an important parameter in such modifications, influencing f.ex. the diffusion of components and rheological properties of the material. In studies concerning enzymatic or microbial modification of bran, the reactions have often been conducted at high water content. In industrial scale applications, low water content may be advantageous, especially in processes followed by drying as a post-treatment procedure. The aim was to study the effects of water content ranging from about 30–90%, on yeast fermentation and xylanase treatment of peeled wheat bran. Yeast was metabolically active also at low water activity, as shown by carbon dioxide production. Folate content and the amount of free ferulic acid approximately doubled in yeast fermentations at high water content, but did not markedly change in yeast fermentations at low water content. Instead, the amount of soluble arabinoxylan increased significantly also at low water content. In the enzymatic xylanase treatments, arabinoxylan solubilization was highest at the water content of about 40%, where material was transformed from powder like material into a plastic mass. The effects of water content on the kinetics of xylanase action are being further studied.
Original languageEnglish
Article numberP4P08
JournalCereal Foods World
Volume54
Issue number2
Publication statusPublished - 2009
MoE publication typeB1 Article in a scientific magazine
EventC&E Spring Meeting 2009 : Whole Grain Global Summit - Newcastle upon Tyne, United Kingdom
Duration: 25 Mar 200927 Mar 2009

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Dietary Fiber
wheat bran
water content
Water
bran
xylanases
Yeasts
yeasts
Fermentation
arabinoxylan
fermentation
ferulic acid
health promotion
rheological properties
solubilization
water activity
folic acid
Folic Acid
Carbon Dioxide
Powders

Cite this

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title = "Microbial and enzymatic modification of wheat bran properties at reduced water content",
abstract = "Cereal bran is high in dietary fibre and a good source of health promoting compounds. Enzymatic or microbiological methods offer means to improve the technological properties of bran. Water content is an important parameter in such modifications, influencing f.ex. the diffusion of components and rheological properties of the material. In studies concerning enzymatic or microbial modification of bran, the reactions have often been conducted at high water content. In industrial scale applications, low water content may be advantageous, especially in processes followed by drying as a post-treatment procedure. The aim was to study the effects of water content ranging from about 30–90{\%}, on yeast fermentation and xylanase treatment of peeled wheat bran. Yeast was metabolically active also at low water activity, as shown by carbon dioxide production. Folate content and the amount of free ferulic acid approximately doubled in yeast fermentations at high water content, but did not markedly change in yeast fermentations at low water content. Instead, the amount of soluble arabinoxylan increased significantly also at low water content. In the enzymatic xylanase treatments, arabinoxylan solubilization was highest at the water content of about 40{\%}, where material was transformed from powder like material into a plastic mass. The effects of water content on the kinetics of xylanase action are being further studied.",
author = "Outi Santala and Pekka Lehtinen and Emilia Selinheimo and Kati Katina and Kaisa Poutanen",
note = "Poster abstract",
year = "2009",
language = "English",
volume = "54",
journal = "Cereal Foods World",
issn = "0146-6283",
publisher = "AACC International",
number = "2",

}

Microbial and enzymatic modification of wheat bran properties at reduced water content. / Santala, Outi; Lehtinen, Pekka; Selinheimo, Emilia; Katina, Kati; Poutanen, Kaisa.

In: Cereal Foods World, Vol. 54, No. 2, P4P08, 2009.

Research output: Contribution to journalOther journal contributionScientific

TY - JOUR

T1 - Microbial and enzymatic modification of wheat bran properties at reduced water content

AU - Santala, Outi

AU - Lehtinen, Pekka

AU - Selinheimo, Emilia

AU - Katina, Kati

AU - Poutanen, Kaisa

N1 - Poster abstract

PY - 2009

Y1 - 2009

N2 - Cereal bran is high in dietary fibre and a good source of health promoting compounds. Enzymatic or microbiological methods offer means to improve the technological properties of bran. Water content is an important parameter in such modifications, influencing f.ex. the diffusion of components and rheological properties of the material. In studies concerning enzymatic or microbial modification of bran, the reactions have often been conducted at high water content. In industrial scale applications, low water content may be advantageous, especially in processes followed by drying as a post-treatment procedure. The aim was to study the effects of water content ranging from about 30–90%, on yeast fermentation and xylanase treatment of peeled wheat bran. Yeast was metabolically active also at low water activity, as shown by carbon dioxide production. Folate content and the amount of free ferulic acid approximately doubled in yeast fermentations at high water content, but did not markedly change in yeast fermentations at low water content. Instead, the amount of soluble arabinoxylan increased significantly also at low water content. In the enzymatic xylanase treatments, arabinoxylan solubilization was highest at the water content of about 40%, where material was transformed from powder like material into a plastic mass. The effects of water content on the kinetics of xylanase action are being further studied.

AB - Cereal bran is high in dietary fibre and a good source of health promoting compounds. Enzymatic or microbiological methods offer means to improve the technological properties of bran. Water content is an important parameter in such modifications, influencing f.ex. the diffusion of components and rheological properties of the material. In studies concerning enzymatic or microbial modification of bran, the reactions have often been conducted at high water content. In industrial scale applications, low water content may be advantageous, especially in processes followed by drying as a post-treatment procedure. The aim was to study the effects of water content ranging from about 30–90%, on yeast fermentation and xylanase treatment of peeled wheat bran. Yeast was metabolically active also at low water activity, as shown by carbon dioxide production. Folate content and the amount of free ferulic acid approximately doubled in yeast fermentations at high water content, but did not markedly change in yeast fermentations at low water content. Instead, the amount of soluble arabinoxylan increased significantly also at low water content. In the enzymatic xylanase treatments, arabinoxylan solubilization was highest at the water content of about 40%, where material was transformed from powder like material into a plastic mass. The effects of water content on the kinetics of xylanase action are being further studied.

M3 - Other journal contribution

VL - 54

JO - Cereal Foods World

JF - Cereal Foods World

SN - 0146-6283

IS - 2

M1 - P4P08

ER -