ACCUMULATION PROCESSES OF NUTRITIONALLY BENEFICIAL MINERALS IN A BROWN ALGAE, HIJIKI (SARGASSUM FUSIFORME), DURING GROWTHFUSIFORME), DURING GROWTH

Background and objectives: The brown algae Hijiki, Sargassum fusiforme, is an important foodstuff for Japanese, and serves as a rich supply of minerals and dietary fiber. Warming of the earth elevates the ocean-water temperature year by year, and exerts ecological influences. Hijiki also seems to ch...

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Bibliographic Details
Published in:Annals of nutrition and metabolism 2017-10, Vol.71 (Suppl. 2), p.1301
Main Authors: Katayama, Masayuki, Sugawa-Katayama, Yohko, Murakami, Kaori
Format: Article
Language:English
Subjects:
Accumulation
Algae
Arsenic
Atomic absorption analysis
Atomic absorption spectrophotometry
Atomic properties
Calcium
Cooking
Dietary fiber
Dietary minerals
Ecological effects
Hydrochloric acid
Iron
Magnesium
Manganese
Minerals
Nitric acid
Nutrition education
Nutritive value
Organs
Perchloric acid
Plant tissues
Spectral analysis
Spectrophotometry
Sulfuric acid
Water temperature
Zinc
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Summary:Background and objectives: The brown algae Hijiki, Sargassum fusiforme, is an important foodstuff for Japanese, and serves as a rich supply of minerals and dietary fiber. Warming of the earth elevates the ocean-water temperature year by year, and exerts ecological influences. Hijiki also seems to change their regular growing processes, becoming chlorotic earlier than before. To know the physiological changes during their growth, we studied the accumulating processes of several nutritionally beneficial minerals in Hijki plants during their growth from the primary leaf stage to their chlorotic state. Although the accumulation of arsenic (As) occurred in plants during their growth, arsenic (As) could be mostly removed during the pre-cooking process of the commercial dried Hijiki products. Methods: Hijiki plants were harvested at the seashore of Kushimoto, Wakayama Prefecture, Japan. The fresh samples of Hijiki plants were lyophilized and decomposed with conc perchloric acid - conc nitric acid, or with conc sulfuric acid - conc nitric acid. The ashed samples were dissolved in 1N hydrochloric acid, and the concentrations of arsenic (As), calcium (Ca), iron (Fe), magnesium (Mg), manganese (Mn), potassium (K), and zinc (Zn) in the plant tissues were determined by atomic absorption spectrophotometry . Results: The concentration of calcium (Ca) per tissue weight increased gradually coming to a rather constant value before the appearance of genital organs on the plants, although the concentration of arsenic (As) continued to increase. Until that time, the concentrations of zinc (Zn) and manganese (Mn) continued to increase further. The concentration of iron (Fe) and magnesium (Mg) increased gradually, expressing a strong correlation between them, but the concentration of magnesium (Mg) was not uniform in the chlorotic plants. Conclusions: From the viewpoint of nutritional value, matured plants of Hijiki had better be harvested, but to keep good quality of the products, fine days under the sunshine should be selected, even before complete maturation.
ISSN:0250-6807
1421-9697
DOI:10.1159/000480486