Dried Green and Purple Lavers (Nori) Contain Substantial Amounts of Biologically Active Vitamin B<sub>12</sub> but Less of Dietary Iodine Relative to Other Edible Seaweeds
Fumio Watanabe, Shigeo Takenaka, Hiromi Katsura, S. A. M. Zakir Hussain Masumder, Katsuo Abe, Yoshiyuki Tamura +1 more
Journal of Agricultural and Food Chemistry
Abstract
Vitamin B(12) concentrations of dried green (Enteromorpha sp.) and purple (Porphyra sp.) lavers (nori) were determined by both Lactobacillus leichmannii ATCC 7830 microbiological and intrinsic factor chemiluminescence methods. The values determined by using the microbiological method (63.58 +/- 2.90 and 32.26 +/- 1.61 microg/100 g of dry weight) were identical to those found by using the chemiluminescence method (69.20 +/- 2.21 and 25.07 +/- 0.54 microg/100 g of dry weight) in both dried green and purple lavers, respectively. A silica gel 60 thin-layer chromatography of both laver extracts shows that non-coenzyme forms (hydroxo and cyano forms) of vitamin B(12) predominate in both dried lavers. The dried lavers contained lesser amounts of dietary iodine ( approximately 4-6 mg/100 g of dry weight) relative to other seaweeds, suggesting that excessive intake of the dried lavers is unlikely to result in harmful intake of dietary iodine. These results indicate that the dried lavers (nori) are the most excellent source of vitamin B(12) among edible seaweeds, especially for strict vegetarians.
Extracted Claims
7 claims extracted from this paper into the knowledge graph
dried green laver (Enteromorpha sp.) contains vitamin B12 63.58 +/- 2.90 microg/100 g of dry weight
“Vitamin B(12) concentrations of dried green (Enteromorpha sp.) and purple (Porphyra sp.) lavers (nori) were determined by both Lactobacillus leichmannii ATCC 7830 microbiological and intrinsic factor ...”
dried lavers (nori) contain non-coenzyme forms (hydroxo and cyano forms) of vitamin B12
“A silica gel 60 thin-layer chromatography of both laver extracts shows that non-coenzyme forms (hydroxo and cyano forms) of vitamin B(12) predominate in both dried lavers.”
dried lavers (nori) contain dietary iodine 4-6 mg/100 g of dry weight
“The dried lavers contained lesser amounts of dietary iodine ( approximately 4-6 mg/100 g of dry weight) relative to other seaweeds, suggesting that excessive intake of the dried lavers is unlikely to ...”