title: Characterization of a vitamin B12 compound from unicellular coccolithophorid alga (Pleurochrysis carterae).
abstract: A unicellular coccolithophorid alga, Pleurochrysis carterae, contained 125.4 +/- 1.2 microg of vitamin B12 per 100 g dry cell weight of the lyophilized algal cells. A vitamin B12 compound was purified from the lyophilized algal cells and partially characterized. The silica gel 60 TLC and reversed-phase HPLC patterns of the purified pink-colored compound were identical to those of authentic vitamin B12, but not those of vitamin B12 analogues inactive for humans. When 22-week-old B12-deficient rats which excreted substantial amounts of methylmalonic acid (75.5 +/- 12.3 mg/day) in urine were fed the P. carterae (10 g per kg diet)-supplemented diet for 12 d, urinary methylmalonic acid excretion (as an index of vitamin B12 deficiency) of the rats became undetectable and hepatic vitamin B12 level of the rats was significantly increased.
authors.affiliation: Department of Health Science, Kochi Women's University, Kochi 780-8515, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Miyamoto
authors.forename: F
authors.initials: F
authors.lastname: Watanabe
authors.forename: S
authors.initials: S
authors.lastname: Ebara
authors.forename: S
authors.initials: S
authors.lastname: Takenaka
authors.forename: H
authors.initials: H
authors.lastname: Takenaka
authors.forename: Y
authors.initials: Y
authors.lastname: Yamaguchi
authors.forename: N
authors.initials: N
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Inui
authors.forename: Y
authors.initials: Y
authors.lastname: Nakano
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid; D056890:Eukaryota / Q000378:metabolism*; D008764:Methylmalonic Acid / Q000652:urine; D051381:Rats; D013997:Time Factors; D014805:Vitamin B 12 / Q000031:analogs & derivatives / Q000032:analysis / Q000302:isolation & purification* / Q000627:therapeutic use; D014806:Vitamin B 12 Deficiency / Q000188:drug therapy*
chemical_list: D008764:Methylmalonic Acid; D014805:Vitamin B 12