Development and application of an analytical method for the determination of storage lipids, fatty acids and fatty alcohols in Calanus finmarchicus.
A method was developed for the determination of the major storage lipids, wax ester and triglycerides, in the copepod Calanus finmarchicus. A variation of the Folch method was used to extract the lipid. The method was scaled down to enable the extraction of either pooled (-1 mg) or individual (approximately 200 microg) copepods. The major lipid classes were identified using TLC and quantified using HPLC coupled with evaporative light scattering detection. Analysis of laboratory reference materials indicated that this method underestimated the minor triglyceride component, but gave a good estimate of the major wax ester component. The fatty acid and fatty alcohol composition of the C. finmarchicus were determined following trans-esterification of the lipid extract in methanol. Fatty acids and fatty alcohols were initially identified by comparison with authentic standard and by mass spectroscopy. Using GC with flame ionisation detection the normalised area percentage of the fatty alcohols and fatty acid methyl esters was determined simultaneously in one run for either pooled or individual copepod samples. These methods were applied to C. finmarchicus collected from the Irminger Sea, North Atlantic in 2001 and 2002.
Webster
Lynda
L
FRS Marine Laboratory, Aquatic Environment, PO Box 101, 375 Victoria Road, Aberdeen AB11 9DB, UK. websterl@marlab.ac.uk
Walsham
Pam
P
Ahmed
Yusuf
Y
Richards
Sarah
S
Hay
Steve
S
Heath
Mike
M
Moffat
Colin F
CF
D000818:Animals; D002138:Calibration; D002849:Chromatography, Gas / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002855:Chromatography, Thin Layer / Q000379:methods*; D033342:Copepoda / Q000737:chemistry*; D004952:Esters / Q000737:chemistry; D005227:Fatty Acids / Q000032:analysis*; D005233:Fatty Alcohols / Q000032:analysis*; D005395:Fish Oils / Q000737:chemistry; D008055:Lipids / Q000032:analysis*
D004952:Esters; D005227:Fatty Acids; D005233:Fatty Alcohols; D005395:Fish Oils; D008055:Lipids