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Inhibitory effect of linoleic acid on chain elongation and desaturation of 18∶2 c,t isomers in lactating and neonatal rats

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Lipids

Abstract

The previous studies showed that dietary 18∶2 c,t isomers could be chain-elongated and desaturated to produce unusual 20∶4 isomers. The present study was undertaken to determine the minimal amount of 18∶2n−6 required to suppress the chain elongation and desaturation of 18∶2 c,t isomers in the lactating and neonatal rats when animals were fed 15% partially hydrogenated canola oil diet containing 1.72% energy as 18∶2 c,t isomers and varying amounts of free 18∶2n−6. These diets induced marginal essential fatty acid (EFA) deficiency states (0.56% energy 18∶2n−6) to EFA adequacy (2.56% energy 18∶2n−6). After feeding for 50 d, the female animals were mated with males by overnight pairing. After conception, the lactating rats were killed, together with one pup from each dam, at term and day 26 of lactation. Two unusual 20∶4 isomers in both maternal and neonatal liver phospholipids were identified as 20∶4Δ5c,8c,11c,14t and 20∶4Δ5c,8c,11c,15t, which were derived from 18∶2Δ9c,12t, and 18∶2Δ9c,13t, respectively. The results showed that 18∶2n−6 at about 2.0% of total energy in maternal diet was required to block the production of 20∶4Δ5c,8c,11c,14t and 20∶4Δ5c,8c,11c,15t in the maternal liver, whereas 18∶2n−6 at about 2.5% of total energy in maternal diet was required to suppress production of these unusual 20∶4 isomers in the neonatal liver.

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Abbreviations

DMOX:

2-alkenyl-4,4-dimethyloxazoline

EFA:

essential fatty acid

FAME:

fatty acid methyl ester

GLC:

gas-liquid chromatography

PHCO:

partially hydrogenated canola oil

PL:

phospholipid

TLC:

thin-layer chromatography

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Authors and Affiliations

  1. Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong

    Kwok Yiu Kwan, Li-Ya Wang, Kwok Pan Chan & Zhen Yu Chen

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  1. Kwok Yiu Kwan
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  2. Li-Ya Wang
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Correspondence to Zhen Yu Chen.

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Kwan, K.Y., Wang, LY., Chan, K.P. et al. Inhibitory effect of linoleic acid on chain elongation and desaturation of 18∶2 c,t isomers in lactating and neonatal rats. Lipids 33, 409–416 (1998). https://doi.org/10.1007/s11745-998-0222-x

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  • DOI: https://doi.org/10.1007/s11745-998-0222-x

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