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Short-term biological reproducibility of serum fatty acid composition in children
Insights
Serum lipid fatty acid composition shows high day-to-day reproducibility in children, especially in cholesteryl esters (CE) and phospholipids (PL). Triglycerides (TG) and free fatty acids (FFA) exhibit lower short-term biological reproducibility.
Area of Science:
- Biochemistry
- Pediatric Nutrition
- Analytical Chemistry
Background:
- Understanding the biological variability of serum fatty acids is crucial for nutritional studies in children.
- Habitual diets can influence short-term changes in fatty acid profiles.
- Previous research has not fully elucidated the day-to-day reproducibility across different serum lipid fractions.
Purpose of the Study:
- To evaluate the short-term biological reproducibility of fatty acid composition in various serum lipid fractions (CE, TG, FFA, PL) in healthy children.
- To compare the reproducibility of fatty acid profiles over 2-day and 7-day intervals.
- To identify which lipid fractions demonstrate higher stability in fatty acid composition.
Main Methods:
- Fasting serum samples were collected from healthy 8- to 9-year-old boys at 2-day and 7-day intervals.
- Fatty acid percentage compositions in serum cholesteryl esters (CE), triglycerides (TG), free fatty acids (FFA), and phospholipids (PL) were analyzed using gas chromatography.
- Reproducibility was assessed by calculating linear correlation coefficients between measurements at different time points.
Main Results:
- Generally higher correlations were observed for CE and PL compared to TG and FFA.
- In CE, 7-day interval correlations for major fatty acids were only slightly lower than 2-day intervals.
- TG and FFA showed a marked decrease in reproducibility between the 2-day and 7-day intervals, indicating lower stability.
Conclusions:
- Serum CE and PL exhibit high short-term biological reproducibility in terms of fatty acid composition in children on habitual diets.
- Serum TG and FFA demonstrate significantly lower day-to-day reproducibility, suggesting greater variability.
- These findings have implications for the design of nutritional studies and the interpretation of fatty acid data in pediatric populations.
Abstract:
To assess the biological day-to-day reproducibility of the fatty acid composition in serum lipid fractions in children on their habitual diets, fasting serum specimens were collected from healthy 8- to 9-year-old boys at 2-day (n = 21) or 7-day (n = 19) intervals. Percentage compositions of fatty acids in serum cholesteryl esters (CE), triglycerides (TG), free fatty acids (FFA) and phospholipids (PL) were analyzed by gas chromatography. The reproducibility was estimated by calculating linear correlation coefficients between the values obtained at the two time-points. Generally the correlations were higher in CE and PL than in TG and FFA. In CE the 7-day correlations of major fatty acids were only slightly lower than the 2-day ones. In PL the impairment of correlations was somewhat greater than in CE, but in TG and FFA there was a marked drop in reproducibility from 2- to 7-day intervals. The 2-day correlation coefficients of the percentages of linoleate, dihomo-gamma-linolenate, arachidonate and eicosapentaenoate in CE were 0.95, 0.84, 0.91 and 0.92, respectively. In PL, the respective values were 0.86, 0.82, 0.95 and 0.90. The present results indicate high short-term biological reproducibility of fatty acid composition in serum CE and PL and clearly lower in those of TG and FFA.
