title: The iron content and ferritin contribution in fresh, dried, and toasted nori, Pyropia yezoensis.
abstract: 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.
authors.affiliation: a Laboratory of Food Quality Design and Development, Division of Agronomy and Horticultural Science, Graduate School of Agriculture , Kyoto University , Kyoto , Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Masuda
authors.forename: Ami
authors.initials: A
authors.lastname: Yamamoto
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Toyohara
mesh_terms: D020418:Algal Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D000595:Amino Acid Sequence; D003296:Cooking; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005293:Ferritins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D005502:Food; D005504:Food Analysis; D015870:Gene Expression; D006801:Humans; D007501:Iron / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D044664:Porphyra / Q000737:chemistry*; D011485:Protein Binding; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012624:Seaweed / Q000737:chemistry*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D020418:Algal Proteins; D011994:Recombinant Proteins; D005293:Ferritins; D007501:Iron
keywords: ferritin; iron; macroalgae; nori; red algae