Plasma pyridoxal phosphate concentrations of men fed different levels of vitamin B-6.
The vitamin B-6 status of 12 white, 3 black, and 7 men of other races was evaluated utilizing plasma pyridoxal phosphate concentrations after the males had been on controlled diets for 8 wk. The diets contained averages of 1.22-1.67 mg/d vitamin B-6 as calculated from food composition tables. The actual mean vitamin B-6 content of these diets as analyzed with Saccharomyces uvarum was 0.75-0.98 mg/d; the mean daily protein intakes were 80.8-84.5 g. All subjects had plasma pyridoxal phosphate concentrations (67.6-125.8 nmol/L) well within the normal range; the values of the different race and dietary groups were similar. Vitamin B-6 requirements were satisfied by the consumption of diets analyzed to contain means of 0.75-0.98 mg/d of the vitamin as demonstrated by plasma pyridoxal phosphate levels indicative of adequate status. Dietary vitamin B-6 intakes should be determined by actual analyses when requirements are being determined.
Driskell
J A
JA
Department of Human Nutrition and Foods, Virginia Polytechnic Institute and State University, Blacksburg 24061.
Chrisley
B M
BM
Thye
F W
FW
Reynolds
L K
LK
D000328:Adult; D000886:Anthropometry; D004032:Diet; D006801:Humans; D008297:Male; D009994:Osmolar Concentration; D011732:Pyridoxal Phosphate / Q000097:blood*; D011736:Pyridoxine / Q000008:administration & dosage* / Q000494:pharmacology; D044469:Racial Groups
D011732:Pyridoxal Phosphate; D011736:Pyridoxine