Merck

The iron content and ferritin contribution in fresh, dried, and toasted nori, Pyropia yezoensis.

Bioscience, biotechnology, and biochemistry (2014-10-16)
Taro Masuda, Ami Yamamoto, Haruhiko Toyohara
RESUMEN

Iron is one of the essential trace elements for humans. In this study, the iron contents in fresh, dried, and toasted nori (Pyropia yezoensis) were analyzed. The mean iron content of fresh, dried, and toasted nori were 19.0, 22.6, and 26.2 mg/100 g (dry weight), respectively. These values were superior to other food of plant origin. Furthermore, most of the iron in nori was maintained during processing, such as washing, drying, and toasting. Then, the form of iron in fresh, dried, and toasted nori was analyzed. As a result, an iron storage protein ferritin contributed to iron storage in raw and dried nori, although the precise rate of its contribution is yet to be determined, while ferritin protein cage was degraded in the toasted nori. It is the first report that verified the ferritin contribution to iron storage in such edible macroalgae with commercial importance.

MATERIALES
Referencia del producto
Marca
Descripción del producto

Sigma-Aldrich
Hydrogen peroxide solution, contains ~200 ppm acetanilide as stabilizer, 3 wt. % in H2O
Sigma-Aldrich
Hydrogen peroxide solution, 50 wt. % in H2O, stabilized
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 35 wt. % in H2O
Sigma-Aldrich
Ammonium-14N2,sulfate-16O4, 99.99 atom % 14N, 99.99 atom % 16O
Sigma-Aldrich
Hydrogen peroxide solution, 30 % (w/w) in H2O, contains stabilizer
Sigma-Aldrich
Ammonium-14N2 sulfate solution, 40 wt. % in H2O, 99.99 atom % 14N
Sigma-Aldrich
Hydrogen peroxide solution, contains potassium stannate as inhibitor, 30-32 wt. % in water, semiconductor grade, 99.999% trace metals basis
Supelco
Hydrogen peroxide solution, ≥30%, for trace analysis
Sigma-Aldrich
Hydrogen peroxide solution, 34.5-36.5%
Millipore
Hydrogen peroxide solution, 3%, suitable for microbiology
Sigma-Aldrich
Ammonium sulfate-14N2 solution, 40 wt. % in H2O, 99.99 atom % 14N
Sigma-Aldrich
Hydrogen peroxide solution, tested according to Ph. Eur.
Sigma-Aldrich
Hydrogen Peroxide Solution, 30% (w/w), puriss. p.a., reag. ISO, reag. Ph. Eur.
Sigma-Aldrich
Hydrogen peroxide solution, purum p.a., ≥35% (RT)
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, ACS reagent
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, meets USP testing specifications
Supelco
Hydrogen peroxide solution, 30 % (w/w), for ultratrace analysis
Sigma-Aldrich
Nitric-14N acid solution, ~10 N in H2O, 99.99 atom % 14N
Sigma-Aldrich
Ammonium sulfate, BioXtra, ≥99.0%
Sigma-Aldrich
Ammonium sulfate, for molecular biology, ≥99.0%
Sigma-Aldrich
Ammonium sulfate, suitable for plant cell culture, ≥99.0%
Sigma-Aldrich
Nitric acid, 70%, purified by redistillation, ≥99.999% trace metals basis
Sigma-Aldrich
Ammonium sulfate, BioUltra, ≥99.0% (T)
Sigma-Aldrich
Nitric acid, ACS reagent, 70%
Sigma-Aldrich
Nitric acid, puriss. p.a., 65.0-67.0%
Sigma-Aldrich
Nitric acid, puriss. p.a., ≥65% (T)
Sigma-Aldrich
Ammonium sulfate, ACS reagent, ≥99.0%
Sigma-Aldrich
Ammonium sulfate, ReagentPlus®, ≥99.0%
Sigma-Aldrich
Nitric acid, puriss. p.a., reag. ISO, reag. Ph. Eur., for determinations with dithizone, ≥65%
Sigma-Aldrich
Nitric acid, red, fuming, HNO3 >90 %