A note on distribution of human plasma levels of ascorbic and dehydroascorbic acid

Area of Science:

• Biochemistry
• Human Physiology
• Nutritional Science

Background:

• Ascorbic acid (vitamin C) is an essential nutrient vital for numerous physiological functions.
• Understanding plasma ascorbic acid concentrations is crucial for assessing nutritional status and overall health.
• Previous research indicates variability in vitamin C levels, necessitating further investigation into influencing factors.

Purpose of the Study:

• To quantify ascorbic acid concentrations in a cohort of human plasma samples.
• To investigate the presence and levels of dehydroascorbic acid in relation to ascorbic acid.
• To assess the stability of plasma ascorbic acid concentrations over extended periods.

Main Methods:

• Analysis of ascorbic acid and dehydroascorbic acid levels in 102 human plasma samples.
• Measurement of ascorbic acid concentrations in four individuals at two time points, four years apart.
• Statistical analysis to determine mean concentrations and identify correlations.

Main Results:

• Plasma ascorbic acid concentrations ranged from 1 to 15 µg/mL, with a mean of approximately 8 µg/mL.
• Dehydroascorbic acid was detected only in trace amounts, showing no correlation with ascorbic acid levels.
• Longitudinal analysis revealed no significant changes in plasma ascorbic acid over a four-year interval for the studied individuals.

Conclusions:

• Human plasma ascorbic acid levels exhibit a defined concentration range, consistent with existing literature.
• The stability of plasma ascorbic acid over time suggests that long-term dietary habits are the predominant determinant of vitamin C status.
• Further research into specific dietary patterns and their impact on vitamin C homeostasis is warranted.