Occurrence of vitamin B12 in green, blue, red, and black tea leaves

• Published in: Journal of Nutritional Science and Vitaminology Vol. 50; no. 6; pp. 438 - 440
• Main Authors: Kittaka Katsura, H. (Kyoto Women's Univ. (Japan)), Watanabe, F, Nakano, Y
• Format: Journal Article
• Language: English
• Published: Tokyo Center for Academic Publications Japan 2004
• Subjects: BIOLOGICAL ANALYSIS; Biological and medical sciences; Camellia sinensis - chemistry; cobalamin; Feeding. Feeding behavior; Fermentation; Fundamental and applied biological sciences. Psychology; Lactobacillus delbrueckii; LEAVES; Luminescent Measurements; Plant Leaves - chemistry; TEA; VEGETARIANS; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Vitamin B 12 - analysis; vitamin B12; VITAMINS B; tea; Vertebrata; Mammalia; cobalamin; vegetarians; B-Vitamins; Plant leaf; vitamin B12; Black tea; Green tea; Cyanocobalamin
• ISSN: 0301-4800; 1881-7742
• DOI: 10.3177/jnsv.50.438

Vitamin B sub(12) contents of green (0.046-0.263 and 0.125-0.535 Microg/l0O g dry weight). blue (0.068-0.081 and 0.525-0.528 Microg/l0O g dry weight). red (0.061 and 0.663 Micro g/100 g dry weight), and black (0.104-0.859 and 0.305-1.20 Microg/1O0 g dry weight) tea leaves were obtained by intrinsic factor-chemiluminescence and microbiological methods, respectively. Although vitamin B12 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 deox-yribosides and deoxynucleotldes (known as an alkali-resistant factor), hut may have been due to that of inactive corrinoid compounds for mammals in the tea leaves.