Abstract
The fatty acid composition and structure of pawpaw fruit (Asimina triloba) triglycerides were examined and found to contain fatty acids ranging from C6 to C20. Octanoate represented 20% of the fatty acids while other medium-chain fatty acids were present in low amounts. Analysis of the intact triglycerides by high-temperature gas-liquid chromatography gave an unusual three-cycle carbon number distribution. Analysis of triglyceride fractions separated according to degree of unsaturation suggested that one octanoate was paired with diglyceride species containing long-chain fatty acids. Determination of the double-bond positions of monoene fatty acids revealed cis Δ9 and cis Δ11 hexadecenoate and cis Δ9, cis Δ11, and cis Δ13 octadecenoate isomers were present in significant quantities. Octanoate and positional monoene fatty acid isomers were found only in the fruit lipids and not in the seed lipids. Phenacyl esters of fatty acids were found to be useful derivatives for structure determination using multiple types of analyses.
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Abbreviations
- Ag+-TLC:
-
silver ion thin-layer chromatography
- GLC:
-
gas-liquid chromatography
- HPLC:
-
high-performance liquid chromatography
- TLC:
-
thin-layer chromatography
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Wood, R., Peterson, S. Lipids of the pawpaw fruit: Asimina triloba . Lipids 34, 1099–1106 (1999). https://doi.org/10.1007/s11745-999-0461-x
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DOI: https://doi.org/10.1007/s11745-999-0461-x