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Oxidation of polyphenols in phytate-reduced high-tannin cereals: Effect on different phenolic groups and on in vitro accessible iron

Erika Matuschek (Institutionen för kemi och biovetenskap, Livsmedelsvetenskap) ; Elifatio Towo (Institutionen för kemi och biovetenskap, Livsmedelsvetenskap) ; Ulf Svanberg (Institutionen för kemi och biovetenskap, Livsmedelsvetenskap)
Journal of Agricultural and Food Chemistry Vol. 49 (2001), 11, p. 5630-5638.
[Artikel, refereegranskad vetenskaplig]

After reduction of phytate with phytase, water-slurries of two high-tannin cereal flours were incubated with polyphenol oxidase (mushroom tyrosinase) and the effects on different phenolic groups and on in vitro accessible iron were studied. Enzyme incubation was also performed after cooking, soaking and germination of the cereals. Phytase incubation significantly decreased the phytate content and incubation with polyphenol oxidase had a reducing effect on the total phenol content, as well as on the amount of catechol and resorcinol groups. The in vitro accessible iron increased when the cereals were incubated with phytase and polyphenol oxidase, and the highest accessibility of iron was obtained when the germinated samples were incubated. The results from this study imply that oxidation of polyphenols in high-tannin cereals, after reduction of phytate, may be used to increase the bioavailability of iron in foods prepared from these cereals.

Nyckelord: Sorghum, finger millet, polyphenols, condensed tannins, tyrosinase, polyphenol oxidase, in vitro iron accessibility, iron availability

Denna post skapades 2006-08-29.
CPL Pubid: 2007


Institutioner (Chalmers)

Institutionen för kemi och biovetenskap, Livsmedelsvetenskap (1900-2004)



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