American Journal of Clinical Nutrition, Vol 50, 100-108, Copyright © 1989 by The American Society for Clinical Nutrition, Inc

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Phylloquinone in plasma from elderly and young adults: factors influencing its concentration

JA Sadowski, SJ Hood, GE Dallal and PJ Garry
USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.

Fasting plasma phylloquinone concentrations were determined by reverse- phase high-performance liquid chromatography in a population of young (n = 131) and elderly (n = 195) human subjects. The distribution of values was non-Gaussian but was converted to Gaussian form after a logarithmic transformation of the data. The normal range derived from the lognormal distribution was 0.29-2.64 nmol/L (geometric means = 0.87 nmol/L, median = 0.86 nmol/L). Young females had significantly decreased plasma phylloquinone concentrations when compared with the elderly females whereas concentrations in young males were slightly higher than those in elderly males. A regression model was constructed and revealed that plasma phylloquinone concentrations were positively correlated with plasma triglycerides and alpha-tocopherol. Although the elderly subjects (means = 1.05 nmol/L) had higher levels of phylloquinone than the young subjects (0.94 nmol/L), when the concentration of phylloquinone in plasma is expressed as nanomoles phylloquinone per millimole of triglyceride, the elderly subjects (0.62 x 10(-6) showed decreased levels for phylloquinone compared with the young subjects (0.82 x 10(-6) (p less than 0.001).

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