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Titolo:
Cross-linking of maize walls by ferulate dimerization and incorporation into lignin
Autore:
Grabber, JH; Ralph, J; Hatfield, RD;
Indirizzi:
USDA ARS, US Dairy Forage Res Ctr, Madison, WI 53706 USA USDA ARS MadisonWI USA 53706 Dairy Forage Res Ctr, Madison, WI 53706 USA
Titolo Testata:
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
fascicolo: 12, volume: 48, anno: 2000,
pagine: 6106 - 6113
SICI:
0021-8561(200012)48:12<6106:COMWBF>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
CELL-WALLS; MODEL COMPOUNDS; DIFERULIC ACID; STRUCTURAL REACTIVITY; ENZYMATIC DEGRADATION; CYNODON-DACTYLON; SYNTHETIC LIGNIN; PHENOLIC-ACIDS; GRASS WALLS; IN-VITRO;
Keywords:
Gramineae; Zea mays; ferulic acid; diferulic acids; cell wall; lignin; dehydrogenation polymer; cross-linking;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Grabber, JH USDA ARS, US Dairy Forage Res Ctr, 1925 Linden Dr W, Madison, WI 53706 USA USDA ARS 1925 Linden Dr W Madison WI USA 53706 n, WI 53706 USA
Citazione:
J.H. Grabber et al., "Cross-linking of maize walls by ferulate dimerization and incorporation into lignin", J AGR FOOD, 48(12), 2000, pp. 6106-6113

Abstract

Cross-linking of xylans and lignin by ferulates was investigated with primary maize walls acylated with 2% ferulate and with ferulate ethyl esters. Peroxidase-mediated coupling of wall ferulate and ethyl ferulate yielded mostly 8-coupled products, including three new dehydrodimers. Significant quantities of 5-5-coupled diferulate formed only within walls, suggesting that matrix effects influence dimer formation. Over 60% of wall ferulate dimerized upon H2O2 addition, suggesting that xylan feruloylation is highly regulated during wall biosynthesis to permit extensive dimer formation at the onset of lignification. During lignification, ferulate and 5-5-coupled diferulate copolymerized more rapidly and formed fewer ether-linked structures with coniferyl alcohol than 8-5-, 8-O-4-, and 8-8-coupled diferulates. The potential incorporation of most ferulates and diferulates into lignin exceeded90%. As a result, xylans become extensively cross-linked by ferulate dimerization and incorporation to lignin, but only a small and variable proportion of these cross-links is measurable by solvolysis of lignified walls.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/10/20 alle ore 23:20:54