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2 edition of Elucidation of the composition and structure of a complex maize bran heteroxylan found in the catalog.

Elucidation of the composition and structure of a complex maize bran heteroxylan

Pawadee Methacanon

Elucidation of the composition and structure of a complex maize bran heteroxylan

by Pawadee Methacanon

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Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Chemistry, Faculty of Science, 1999.

Statementby Pawadee Methacanon.
ID Numbers
Open LibraryOL18315743M

Maize (Zea mays or corn) has a wide variety of uses and broad economic is a significant food source for humans, a chief ingredient in livestock feed, and is the source of a wide range of manufactured products, including sweeteners, fuel, and adhesives. It has previously been reported that DCB‐habituated maize cells constitute a suitable cellular model to investigate heteroxylan metabolism, since their coping strategies are based on altered arabinoxylan networks, which show a certain degree of response plasticity depending on the habituation level (Mélida et al. ; de Castro et al. ).

Waterstraat, M.; Bunzel, M.* A stable isotope dilution approach to analyze ferulic acid oligomers in plant cell walls using liquid chromatography - tandem mass spectrometry.   Little data are available in literature on microbial composition of maize and maize bran: to our knowledge up to now researches were carried out on the evolution of fermenting microbiota in wheat or rye brans (Katina et al. ; Manini et al. ) and in ethnic food products, such as tarhana (Settanni et al. ). Very lacking information.

DNA methylation can play important roles in the regulation of transposable elements and genes. A collection of mutant alleles for 11 maize (Zea mays) genes predicted to play roles in controlling DNA methylation were isolated through forward- or reverse-genetic approaches. Low-coverage whole-genome bisulfite sequencing and high-coverage sequence-capture bisulfite sequencing .   Overall, this new population of maize inbred lines harbors substantial phenotypic and genotypic diversity that can be exploited efficiently for maize improvement through association analysis. While population structure has a persistent effect in this diverse maize population, the effect is one of reasonable magnitude that can be controlled.


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Elucidation of the composition and structure of a complex maize bran heteroxylan by Pawadee Methacanon Download PDF EPUB FB2

Three complex heteroxylan side-chains acylated with ferulate and one arabinosyl ester of p-coumaric acid have been isolated from maize bran insoluble fibre after acidic hydrolysis and fractionation by gel permeation chromatography and semi-preparative RP-HPLC.

The complete structural elucidation of all isolated compounds was achieved by 1D/2D NMR spectroscopy Cited by:   Three complex heteroxylan side-chains acylated with ferulate and one arabinosyl ester of p-coumaric acid have been isolated from maize bran insoluble fibre after acidic hydrolysis and fractionation by gel permeation chromatography and semi-preparative complete structural elucidation of all isolated compounds was achieved by 1D/2D NMR Cited by: Three complex heteroxylan side-chains acylated with ferulate and one arabinosyl ester of p-coumaric acid have been isolated from maize bran insoluble fibre after acidic hydrolysis and fractionation by gel permeation chromatography and semi-preparative RP-HPLC.

The complete structural elucidation of all isolated compounds was achieved by 1D/2D NMR spectroscopy. Isolation and structural identification of complex feruloylated heteroxylan side-chains from maize bran Ella Allerdings a, John Ralph b,c, Hans Steinhart a, Mirko Bunzel a,* a Institute of Biochemistry and Food Chemistry, Department of Food Chemistry, University of Hamburg, GrindelalleeHamburg, Germany b US Dairy Forage Research Center, USDA.

Three complex heteroxylan side-chains acylated with ferulate and one arabinosyl ester of p-coumaric acid have been isolated from maize bran insoluble fibre after acidic hydrolysis and.

Maize bran heteroxylan samples were extracted in various conditions of severity. Their ferulate and diferulate content was investigated by GC–MS of methyl ester-TMSi derivatives. When extracted by M NaOH in mild conditions, the heteroxylan sample contained a low level of ferulic acid (% by wt.) and the main diferulate surviving.

The starch in maize is made up of two glucose polymers: amylose, an essentially linear molecule, and amylopectin, a branched form. The composition of maize starch is genetically controlled.

In common maize, with either the dent or flint type of endosperm, amylose makes up 25 to 30 percent of the starch and amylopectin makes up 70 to 75 percent. The maize bran sample used by these authors contained a FA and di-FA content of and μg/mg, respectively, the 8–5′ and 5–5′ structures being the main diferulates.

In the maize bran sample used in our study FA and di-FA represented and μg/mg, respectively, the most prominent being the 5–5′ diferulate structure. Maize is the third important food grain after wheat and rice, and its demand is increasing because of its increased use for biofuel production.

Starch is the main component of maize, which is produced by wet milling process. Maize starch functionality varies with the starch structure and composition, which vary with genotypes and cultural.

Cereal starch production forms the basis of subsistence for much of the world's human and domesticated animal populations. Starch concentration and composition in the maize (Zea mays ssp mays) kernel are complex traits controlled by many genes.

In this study, an association approach was used to evaluate six maize candidate genes involved in kernel. Maize bran heteroxylan samples were extracted in various conditions of severity.

The structure of the phenolic polymer in maize grain fibers, with. Maize bran as livestock feed — Specification 1 Scope This East African Standard prescribes the requirements for maize bran as a livestock feed. 2 Definition Maize bran is a product of the flourmills and is the coarse portion that is separated on sieving of the crushed maize grain, to yield fine flour.

Bran is composed largely of seed coat. J.-F. Thibault's research works with 6, citations reads, including: Mango (Mangifera indica) and ambarella (Spondia cytherea) peel extracted pectins improve viscoelastic.

FOPS are composed of hydrolysates of the hemicellulosic component of maize bran, which is principally a complex heteroxylan comprised of a (1, 4)-linked β. Cell wall cross‐linking can have a substantial effect on the properties of the wall.

To estimate cross‐linking (between arabinoxylans) in cereal fibres, dehydrodiferulate leve. Maize is the most extensively produced grain worldwide; inabout million tons had been cultivated. Corn bran is a byproduct composed of the outer kernel covering the seed, along with 10–25% of adherent starch.

It can be defined as a heterogeneous complex of carbohydrate polymers and lignin. The multi-unit branches in maize heteroxylan are rare among cereal dietary fibers, as are some of the linkages between sugars on these branches [e.g., (1, 2)-and (1, 3)-linkages between β-D.

Hemicelluloses on the other hand, are more diverse, complex heterosaccharides with many variations in their structure. The most commonly present hemicellulose is xylan. Its backbone is a chain of β-1,4-linked d -xylose residues, and it is modified and branched through connection to l -arabinose, d -galactose, 4- O -methyl-glucuronic acid, and.

Xylans are somewhat complex polysaccharides whose structures vary with the plant and plant tissue source. Corn cobs contain a considerable reservoir of xylan-type hemicelluloses. The estimate for world maize production in / was approximately million tons.

The maize (Zea mays) kernel plays a critical role in feeding humans and livestock around the world and in a wide array of industrial applications. An understanding of the regulation of kernel starch, protein, and oil is needed in order to manipulate composition to meet future needs.

We conducted joint-linkage quantitative trait locus mapping and genome-wide association studies. Maize (Zea mays L.) is a host to numerous pathogenic species that impose serious diseases to its ear and foliage, negatively affecting the yield and the quality of the maize crop.A considerable amount of research has been carried out to elucidate mechanisms of maize-pathogen interactions with a major goal to identify defense-associated proteins.Structure of Maize Grain.

The Maize grain can be taken as an example of monocotyledon seed. The maize grain is a small one-seeded fruit called the maize grain the seed coat (testa) is fused with the fruit wall (pericarp).Externally, the maize grain is yellow in colour and somewhat triangular in shape.

On one side of the grain is a small, opaque, oval and whitish .Mary L Parker, Annie Ng, Keith W Waldron, The phenolic acid and polysaccharide composition of cell walls of bran layers of mature wheat (Triticum aestivum L.

cv. Avalon) grains, Journal of the Science of Food and Agriculture, /jsfa, 85, 15, (), ().