Ether-Linked Lipids: Chemistry and Methods of Measurement

Hanahan, Donald J.

doi:10.1016/b978-0-12-654150-2.50009-9

Cited by 8 publications

(7 citation statements)

References 67 publications

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“…The (4-7%). These values compare to ranges of 1.5-2.5% reported in some experimental sheep herds [14,66], to 2-4% in others [17,67,68], and values as high as 5-6% [15,69]. The high lipid content in the Sarda sheep appears to be related mainly to their age, with older sheep showing higher fat levels [16], and less to diet supplementation [14].…”

Section: Discussionsupporting

confidence: 73%

“…Aldehydes released from the dietary plasmalogenic lipids in meats are readily oxidized to their corresponding FAs and enter the general FA pool. Characterization and analysis of plasmalogenic lipids is generally based on their stability to basecatalyzed methanolysis, and rapid conversion to their dimethylacetals under acid-catalyzed methanolysis conditions [28,48,69].…”

Section: Acyl and Plasmalogenic Lipids In Meatmentioning

confidence: 99%

See 1 more Smart Citation

Total Lipids of Sarda Sheep Meat that Include the Fatty Acid and Alkenyl Composition and the CLA and Trans‐18:1 Isomers

Santercole

Mazzette

Santis

et al. 2007

Lipids

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The total lipids of the longissimus dorsi muscle were analyzed from commercial adult Sarda sheep in Sardina taken from local abattoirs, and in the subsequent year from three local farms in the Sassari region that provided some information on the amount and type of supplements fed to the pasture-fed sheep. The complete lipid analysis of sheep meat included the fatty acids from O-acyl and N-acyl lipids, including the trans- and conjugated linoleic acid (CLA) isomers and the alk-1-enyl ethers from the plasmalogenic lipids. This analysis required the use of a combination of acid- and base-catalyzed methylation procedures, the former to quantitate the O-acyl, N-acyl and alkenyl ethers, and the latter to determine the content of CLA isomers and their metabolites. A combination of gas chromatographic and silver-ion separation techniques was necessary to quantitate all of the meat lipid constituents, which included a prior separation of the trans-octadecenoic acids (18:1) and a separation of fatty acid methyl esters and the dimethylacetals (DMAs) from the acyl and alk-1-enyl ethers, respectively. The alk-1-enyl moieties of the DMAs were analyzed as their stable cyclic acetals. In general, about half of the meat lipids were triacylglycerols, even though excess fat was trimmed from the meat. The higher fat content in the meat appears to be related to the older age of these animals. The variation in the trans-18:1 and CLA isomer profiles of the Sarda sheep obtained from the abattoirs was much greater than in the profiles from the sheep from the three selected farms. Higher levels of 10t-18:1, 7t9c-18:2, 9t11c-18:2 and 10t12c-18:2 were observed in the commercial sheep meat, which reflected the poorer quality diets of these sheep compared to those from the three farms, which consistently showed higher levels of 11t-18:1, 9c11t-18:2 and 11t13c-18:2. In the second study, sheep were provided with supplements during the spring and summer grazing season, which contributed to higher levels of 11t-18:1 and 9c11t-18:2. The farm that provided a small amount of supplements during the spring had the better lipid profile at both time periods. The polyunsaturated fatty acid (PUFA) content was higher in the meat from Sarda sheep from the three farms than in the meat from those sheep obtained from commercial slaughter operations. The plasmalogenic lipid content ranged from 2 to 3% of total lipids, the alk-1-enyl ethers consisted mainly of saturated and monounsaturated moieties, and the trans-18:1 profile was similar to that of the FA. The n-6 (6-8%) and n-3 PUFA (2-3%) contents, the n-6/n-3 ratio (3:1), as well as the saturated fatty acid (SFA) content (42-45%) and the SFA to PUFA ratio (4:1 to 5:1) of the Sarda sheep from the three farms were comparable to sheep meat lipids found in similar commercial operations in Europe. Inclusion of small amounts of supplements for the grazing Sarda sheep resulted in improved quality of sheep meat lipids.

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Section: Discussionsupporting

confidence: 73%

Section: Acyl and Plasmalogenic Lipids In Meatmentioning

confidence: 99%

Total Lipids of Sarda Sheep Meat that Include the Fatty Acid and Alkenyl Composition and the CLA and Trans‐18:1 Isomers

Santercole

Mazzette

Santis

et al. 2007

Lipids

View full text Add to dashboard Cite

show abstract

“…In the present day 21 is consistent with previous observations in investigation, however, the acidic extraction conthe rabbit [3] and in man [21] and is compatible ditions that were employed resulted in the hydrowith the proposition that late in gestation there is lysis of ethanolamine plasmalogen and so it would a decreasing availability of myo-inositol for PI not have contributed to the measured amounts of biosynthesis in fetal rat lung, myo-inositol avail-phosphatidylethanolamine [16]. ability to the fetal lung may therefore be an The presence of myo-inositol in increased concenimportant regulator of the developmental change trations in maternal and fetal rat serum resulted in from the production of a surfactant rich in PI to a significantly reduced PG/PI ratio in lung tissue one rich in PG.…”

Section: Discussionsupporting

confidence: 80%

Effect of myo-inositol on the glycerophospholipid composition of adult and fetal rat lung tissue

Quirk¹,

Baumgarten²,

Bleasdale³

1984

Journal of Perinatal Medicine

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“…73,142,179,186,187 In particular the bands in the region 1040 to 1070 cm Ϫ1 arising from the C-O-C antisymmetric stretching vibrations and bands at 1108 to 1120 cm Ϫ1 arising from the C-O vibration of the ether linkage as well as characteristic bands at ca. 1455 to 1470 cm Ϫ1 attributed to C-H bending (deformation) skeletal vibrations can be identified.…”

Section: Propertiesmentioning

confidence: 99%

“…The chemical properties of these ethers are typical of their structures, 179,180 and only brief mention is warranted here. The ether bond is relatively unreactive and stable to alkaline hydrolysis, e.g., compared to acyl glycerols.…”

Section: Propertiesmentioning

confidence: 99%

Glyceryl-ether monooxygenase [EC 1.14.16.5]. A microsomal enzyme of ether lipid metabolism

Taguchi¹,

Armarego²

1998

Med. Res. Rev.

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Ether-Linked Lipids: Chemistry and Methods of Measurement

Cited by 8 publications

References 67 publications

Total Lipids of Sarda Sheep Meat that Include the Fatty Acid and Alkenyl Composition and the CLA and Trans‐18:1 Isomers

Total Lipids of Sarda Sheep Meat that Include the Fatty Acid and Alkenyl Composition and the CLA and Trans‐18:1 Isomers

Effect of myo-inositol on the glycerophospholipid composition of adult and fetal rat lung tissue

Glyceryl-ether monooxygenase [EC 1.14.16.5]. A microsomal enzyme of ether lipid metabolism

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