VITAMINS
Online ISSN : 2424-080X
Print ISSN : 0006-386X
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Volume 78, Issue 8
Displaying 1-3 of 3 articles from this issue
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  • The Contents of Biotin, Pantothenic Acid and Niacin in Mature Milk of Japanese Women
    Toshiaki WATANABE, Ayumi TANIGUCHI, Tooru FUKUI, Mari OTA, Tsutomu FUK ...
    Article type: Article
    2004 Volume 78 Issue 8 Pages 399-407
    Published: August 25, 2004
    Released on J-STAGE: October 10, 2017
    DOIhttps://doi.org/10.20632/vso.78.8_399
    JOURNAL FREE ACCESS
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    To clarify the concentration of water-soluble vitamins in the mature milk of Japanese women who had delivered a healthy, full-term infant, the contents of biotin, pantothenic acid and niacin were measured in the present study. Milk samples were obtained from 25 healthy nursing women for 21 to 89 days and for 90 to 180 days of lactation in summer and winter, respectively. Total biotin and pantothenic acid were quantified microbiologically using Lactobacillus plantarum, and niacin was measured by HPLC. The biotin content in mature milk was 3.87ng/ml on average, which was lower than those reported previously. The average content of pantothenic acid was 5.30μg/ml, which was nearly double the value used to set the Adequate Intake in 6^<th> revised National Reference Intake in Japan. On the other hand, the mean concentration of niacin was 2.22μg/ml, which was not markedly different from the value in other studies. It is suggested that these values are of importance in the setting of an Estimated Average Requirement for these vitamins.
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  • Estimated Conversion Efficiency of Tryptophan-Nicotinamide Using an Activity Ratio of 3-Hydroxyanthranilate 3,4-dioxygenase to Aminocarboxymuconate-semialdehyde Decarboxylase in Fishes
    Tsutomu FUKUWATARI, Kozue MATO, Mari OHTA, Ryuzo SASAKI, Katsumi SHIBA ...
    Article type: Article
    2004 Volume 78 Issue 8 Pages 409-411
    Published: August 25, 2004
    Released on J-STAGE: October 10, 2017
    DOIhttps://doi.org/10.20632/vso.78.8_409
    JOURNAL FREE ACCESS
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    In order to estimate the conversion efficiency of tryptophan-nicotinamide in freshwater fishes, carp and crucian, the liver 3-hydroxyanthranilate 3,4-dioxygenase (3-HAO) and aminocarboxymuconate-semialdehyde decarboxylase (ACMSD) activities were measured. The activity ratios of 3-HAO/ACMSD in carp and crucian were both around 5. These values were extremely low compared with that of rat (650), which can synsthesize a significant amount of nicotinamide from tryptophan. The activities of quinolinate phosphoribosyltransferase in carp and crucian were below the limit of detection. From these results, it was suggested that fishes cannot biosynthesize nicotinamide from tryptophan.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    2004 Volume 78 Issue 8 Pages 413-420
    Published: August 25, 2004
    Released on J-STAGE: October 10, 2017
    DOIhttps://doi.org/10.20632/vso.78.8_413
    JOURNAL FREE ACCESS
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    [in Japanese]
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