Occurrence of Vitamin B12 in Green, Blue, Red, and Black Tea Leaves

• KITTAKA-KATSURA Hiromi

  Department of Food and Nutrition, Kyoto Women's University

• WATANABE Fumio

  Department of Health Science, Kochi Women's University

• NAKANO Yoshihisa

  Department of Applied Biological Chemistry, Osaka Prefecture University

Abstract

Vitamin B₁₂ contents of green (0046-0263 and 0, 125-0535μg/ 100g dry weight), blue (0.068-0.081 and 0.525-0.528μg/100g dry weight), red (0.061 and 0.663μg/100g dry weight), and black (0.104-0.859 and 0.305-1.20μg/100g dry weight) tea leaves were obtained by intrinsic factor-chemiluminescence and microbiological methods, respectively. Although vitamin Bit was found in all tea leaves tested by both assay methods, the higher values by the microbiological method were not due to occurrence of both deoxyribosides and deoxynucleotides (known as an alkali-resistant factor), but may have been due to that of inactive corrinoid compounds for mammals in the tea leaves.

Journal

• Journal of Nutritional Science and Vitaminology

  Journal of Nutritional Science and Vitaminology 50 (6), 438-440, 2004

  Center for Academic Publications Japan

Keywords

• cobalamin
• tea
• vegetarians
• vitamin B₁₂

Details

• CRID: 1390001206324411776
• NII Article ID: 110002704028
• NII Book ID: AA00703822
• DOI: 10.3177/jnsv.50.438
• COI: 1:CAS:528:DC%2BD2MXivFGgtLc%3D
• ISSN: 18817742
• ISSN: 03014800
• ISSN: http://id.crossref.org/issn/03014800
• NDL BIB ID: 7281096
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7281096
• Web Site: https://search.jamas.or.jp/link/ui/2006193042
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed