Long-chain polyene status of preterm infants with regard to the fatty acid composition of their diet: Comparison between absolute and relative fatty acid levels in plasma and erythrocyte phospholipids

• Published in: British journal of nutrition Vol. 73; no. 3; pp. 405 - 422
• Main Authors: Drongelen, Magritha M. H. P. Foreman-Van, Houwelingen, Adriana C. V., Kester, Arnold D. M., Jong, André E. P. De, Blanco, Carlos E., Hasaart, Tom H. M., Hornstra, Gerard
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01.03.1995
• Subjects: Arachidonic acid; Biological and medical sciences; Dietary Fats - administration & dosage; Dietary Fats - metabolism; Docosahexaenoic acid; Effects of fatty acid composition of the diet; Erythrocytes - metabolism; Fatty Acids - administration & dosage; Fatty Acids - metabolism; Feeding. Feeding behavior; Formula milk; Fundamental and applied biological sciences. Psychology; Human milk; Humans; Infant Food; Infant, Newborn; Infant, Premature - blood; Milk, Human; Phospholipids - metabolism; Polyenes - blood; Preterm infant; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Human milk; Preterm infant; Docosahexaenoic acid; Arachidonic acid; Formula milk; Human; Premature; Long chain; Polyunsaturated fatty acid; Lipids; Feeding; Newborn diseases; Diet; Infant food; Infant formula; Nutritional status; Breast milk
• ISSN: 0007-1145; 1475-2662
• DOI: 10.1079/BJN19950043

The long-chain polyene (LCP) status of thirty-nine premature infants (birth weight < 1800 g) was evaluated. Twenty-seven infants were fed on an artificial formula, twelve received their own mother's breast milk. Fatty acid compositions of both plasma and erythrocyte (RBC) phospholipids (PL) were determined in umbilical venous blood and in weekly postnatal blood samples until the 28th day of life. Individual fatty acid levels were expressed as absolute quantities (mg fatty acid/I plasma or RBC suspension) and as relative (mg/100 mg total fatty acids) values. The changes with time in the absolute values for 22:6n-3 and 20:4n-6 in plasma were strikingly different from those of the relative values for these fatty acids. In plasma PL the inter-group differences in the absolute postnatal values for 22:6n-3 (P < 0·0005) and 20:4n-6 (P < 0·05) and the relative values for 22:6n-3 (P < 0·02) were significant, with lower fatty acid values in the formula-fed infants. In RBC PL, no significant inter-group differences in the postnatal 22: 6n-3 and 20: 4n-6 values were found. Based on the assumption that it is desirable for formula-fed infants to achieve postnatal plasma LCP values at least comparable with those found in infants fed on human milk, the findings of the present study indicate that both n-3 and n-6 LCP should be added to preterm infant formulas. Moreover, the additional importance of absolute fatty acid levels was demonstrated, although analytical procedures need to be standardized to enable effective comparison of results from different research groups.