Navigation Links
Creating new healthy ingredients by innovative milling techniques and processes for cereal grains
Date:5/5/2010

The bioactive compounds of cereals are concentrated in the peripheral layers of the grains (bran) but most of them have a low bio-accessibility. In the HEALTHGRAIN project of the European Union, new tools for process monitoring were developed that support commercial implementation of innovative milling techniques including partial grain debranning, fine grinding and classification of grain fractions, resulting in flours and ingredients with enhanced nutritional properties.

The wheat grain is a heterogeneous structure with bio-active compounds unevenly distributed within its different parts. The bioactive compounds (fibres, micronutrients and phytochemicals) are mostly concentrated in the grain outer layers, each having its own compositional profile. Therefore levels of bioactive compounds in whole meal flour are at least two times higher than those in white flour. However, some of the bioactive compounds have a low bio-accessibility in peripheral layers as they are trapped in strong cell wall structures which resist conventional milling. They can also be localized close to undesirable contaminants such as microbes, mycotoxins, pesticide residues, heavy metals. Therefore novel technologies have been developed for the transformation of the grains to better exploit their nutritional potential and to ensure food safety requirements.

In order to develop new dry processing techniques, new tools based on new insights in grain tissue composition, structure and properties have been obtained. Biochemical markers of the different grain tissues (pericarp, intermediate layers, aleurone layers, germ) have been identified and allow to determine the tissue composition of the technological fractions and deduce the behaviour of the different grain parts upon fractionation operations. More rapid methods for fractionation monitoring using spectral signature of tissues are on the way. New mechanical devices coupled with microscopy and microspectroscopy have been developed to determine the local properties of tissues and of their interfaces to help the development of fractionation with improved resolution. Especially, the effects of temperature, water content and enzymatic pre-treatments have been investigated.

A way to enrich cereal products with bioactive compounds is to manufacture flours with high levels of selected parts of the outer layers. To remove the very outermost layers, partial debranning of grains in using friction (peeling) or abrasion (pearling), was combined with milling (grinding and sieving) to produce flours with tailored tissue composition and thus controlled in content of bioactive compounds, as monitored by the marker methodology. Flours made from peeled grains, peeled and pearled grains and grains with removed outermost layer and crease parts exhibited high contents of bioactive compounds and improved nutritional effects as compared to common flours.

Another way of exploiting cereal potential is to use the miller's bran, a by-product of the milling industry, as a source of healthy ingredients. Careful limited grinding and sieving of the bran allowed to prepare a concentrate of aleurone cells and aleurone layer, where most of the bioactive compounds of the grain are located. Further purification by electrostatic classification yielded practically pure aleurone cells that exhibited excellent nutritional properties.

Another approach used ultrafine grinding of the bran in ambient or cryogenic conditions, to provoke a full dissociation of the material at a sub-cellular level. This resulted in an increase in bioactive compounds bioaccessibility. Classification of the fine particles in using a electrostatic separator made it possible to prepare fractions of very contrasted compositions in starting from bran. One of these ingredients, concentrated in fine aleurone particles, showed a good accessibility of anti-oxidants and mineral compared to bran and untreated aleurone. These technologies have been experimented at large-scale by industrial partners, to determine their feasibility and economics.

The work was conducted by INRA, in close collaboration with difent partners in charge of analyses (VTT, KU Leuven, University of Helsinki, University of Uppsala, Puratos, TNO), development of analytical equipment (Branscan) and industrial demonstration and cost evaluation (Barilla, Buhler, SD-Tech).


'/>"/>

Contact: Xavier Rouau
rouau@supagro.inra.fr
33-499-614-477
VTT Technical Research Centre of Finland
Source:Eurekalert

Related biology news :

1. Creating a dream breed
2. Melting tundra creating vast river of waste into Arctic Ocean
3. VAI researchers find long awaited key to creating drought resistant crops
4. Forest deal at Copenhagen must avoid creating carbon refugees
5. Scientists are first to unlock the mystery of creating cultured pearls from the queen conch
6. Stimulus-funded university research addressing issues from climate change to cancer, creating jobs and training a new generation of scientists
7. Marine microbes creating green waves in industry
8. Marine microbes creating green waves in industry
9. Creating ideal neural cells for clinical use
10. Argonne scientists discover possible mechanism for creating handedness in biological molecules
11. Better beer: College team creating anticancer brew
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/22/2016)... and SANDY, Utah , March ... operates the highest sample volume laboratory in ... and UNIConnect, leaders in clinical sequencing informatics and molecular ... of a project to establish the informatics infrastructure for ... NSO has been contracted by the Ontario Ministry ...
(Date:3/15/2016)... March 15, 2016 Yissum Research Development ... technology-transfer company of the Hebrew University, announced today the ... sensing technology of various human biological indicators. Neteera Technologies ... million from private investors. ... the detection of electromagnetic emissions from sweat ducts, enables ...
(Date:3/10/2016)... , March 10, 2016 ... market research report "Identity and Access Management Market by ... Compliance, and Governance), by Organization Size, by Deployment, by ... published by MarketsandMarkets, The market is estimated to grow ... Billion by 2020, at a Compound Annual Growth Rate ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... ... May 25, 2016 , ... The American Medical Informatics ... of the National Coordinator for Health IT (ONC) outlining a measurement approach to ... were available when and where it was needed. The organization of health informatics ...
(Date:5/24/2016)... ... May 24, 2016 , ... ... and traumatic injuries, will be accelerated by research at Worcester Polytechnic Institute (WPI) ... of wound healing and tissue regeneration. , The novel method, developed by WPI ...
(Date:5/23/2016)... ... May 23, 2016 , ... PrecisionAg® Media has released ... and Beyond. The paper outlines the key trends that are creating both opportunities ... witnessed a lot of highs and lows as the precision agriculture market has ...
(Date:5/23/2016)... ... May 23, 2016 , ... ... on molecular nanotechnology, announced the winners for the 2015 Foresight Institute Feynman Prizes. ... are given in two categories, one for experiment and the other for theory ...
Breaking Biology Technology: