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Feeding dried purple laver (nori) to vitamin B12-deficient rats significantly improves vitamin B12 status

Published online by Cambridge University Press:  09 March 2007

Shigeo Takenaka*
Affiliation:
Laboratory of Nutrition and Food Science, Hagoromo-gakuen College, Sakai 592-8344, Japan
Sumi Sugiyama
Affiliation:
Laboratory of Nutrition and Food Science, Hagoromo-gakuen College, Sakai 592-8344, Japan
Shuhei Ebara
Affiliation:
Department of Applied Biological Chemistry, Osaka Prefecture University, Sakai 599-8531, Japan
Emi Miyamoto
Affiliation:
Department of Health Science, Kochi Women's University Kochi 780-8515, Japan
Katsuo Abe
Affiliation:
Department of Health Science, Kochi Women's University Kochi 780-8515, Japan
Yoshiyuki Tamura
Affiliation:
Laboratory of Nutrition and Food Science, Hagoromo-gakuen College, Sakai 592-8344, Japan
Fumio Watanabe
Affiliation:
Department of Health Science, Kochi Women's University Kochi 780-8515, Japan
Shingo Tsuyama
Affiliation:
Department of Veterinary Science, Osaka Prefecture University, Sakai 599-8531, Japan
Yoshihisa Nakano
Affiliation:
Department of Applied Biological Chemistry, Osaka Prefecture University, Sakai 599-8531, Japan
*
*Corresponding author: Dr Shigeo Takenaka, present address Department of Veterinary Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan, fax + 81 722 54 9489, email takenaka@vet.osakafu-u.ac.jp
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Abstract

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To clarify the bioavailability of vitamin B12 in lyophylized purple laver (nori; Porphyra yezoensis), total vitamin B12 and vitamin B12 analogue contents in the laver were determined, and the effects of feeding the laver to vitamin B12-deficient rats were investigated. The amount of total vitamin B12 in the dried purple laver was estimated to be 54.5 and 58.6 (SE 5.3 and 7.5 respectively) ΜG/100 g dry weight by lactobacillus bioassay and chemiluminescent assay with hog intrinsic factor respectively. the purple laver contained five types of biologically active vitamin b12 compounds (cyano-, hydroxo-, sulfito-, adenosyl- and methylcobalamin), in which the vitamin b12 coezymes (adenosyl- and methylcobalamin) comprised about 60 % of the total vitamin b12. when 9-week-old vitamin b12-deficient rats, which excreted substantial amounts of methylmalonic acid (71.7(se 20.2) μmol/d) in urine, were fed the diet supplemented with dried purple laver (10 μg/kg diet) for 20 d, urinary methylmalonic acid excretion (as an index of vitamin B12 deficiency) became undetectable and hepatic vitamin B12 (especially adenosylcobalamin) levels were significantly increased. These results indicate that vitamin B12 in dried purple laver is bioavailable to rats.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2001

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Feeding dried purple laver (nori) to vitamin B12-deficient rats significantly improves vitamin B12 status
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