Physical, microscopic and chemical characterisation of industrial rye and wheat brans from the Nordic countries.
BACKGROUND
Epidemiological studies show inverse relationship between intake of wholegrain cereals and several chronic diseases. Components and mechanisms behind possible protective effects of wholegrain cereals are poorly understood.


OBJECTIVE
To characterise commercial rye bran preparations, compared to wheat bran, regarding structure and content of nutrients as well as a number of presumably bioactive compounds.


METHODS
Six different rye brans from Sweden, Denmark and Finland were analysed and compared with two wheat brans regarding colour, particle size distribution, microscopic structures and chemical composition including proximal components, vitamins, minerals and bioactive compounds.


RESULTS
Rye brans were generally greener in colour and smaller in particle size than wheat brans. The rye brans varied considerably in their starch content (13.2-;28.3%), which reflected variable inclusion of the starchy endosperm. Although rye and wheat brans contained comparable levels of total dietary fibre, they differed in the relative proportions of fibre components (i.e. arabinoxylan, beta-glucan, cellulose, fructan and Klason lignin). Generally, rye brans contained less cellulose and more beta-glucan and fructan than wheat brans. Within small variations, the rye and wheat brans were comparable regarding the contents of tocopherols/tocotrienols, total folate, sterols/stanols, phenolic acids and lignans. Rye bran had less glycine betaine and more alkylresorcinols than wheat brans.


CONCLUSIONS
The observed variation in the chemical composition of industrially produced rye brans calls for the need of standardisation of this commodity, especially when used as a functional ingredient in foods.
Kamal-Eldin
Afaf
A
Department of Food Science, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden.
Lærke
Helle Nygaard
HN
Knudsen
Knud-Erik Bach
KE
Lampi
Anna-Maija
AM
Piironen
Vieno
V
Adlercreutz
Herman
H
Katina
Kati
K
Poutanen
Kaisa
K
Man
Per
P