Polar and Neutral Lipid Composition in the Pelagic Tunicate

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1、Lipids(2007)42:647–657DOI10.1007/s11745-007-3066-0ORIGINALARTICLEPolarandNeutralLipidCompositioninthePelagicTunicatePyrosomaatlanticumPatrickMayzaudÆMarcBoutouteÆRenzoPerissinottoÆPeterNicholsReceived:6February2007/Accepted:17April2007/Publishedonline:2June2007Ó

2、AOCS2007AbstractStructureandfunctioningofcolonialpyro-5,24(28)E-dien-3b-olaccountedfor11%ofthetotalster-somesarelargelyundescribedandtheirlipidcharacteris-ols.Thelowlevelsoftriacylglycerolsandfreefattyacids,ticshavereceivedlimitedattention.Theaimofthispapercoupl

3、edwithhighconcentrationsofglycolipidsandphy-istofillthisgapononeofthedominantspeciesPyrosomatoplankton-deriveddegradedchloropigments,isevidenceatlanticum.Lipidcontentistightlycoupledtosizeandofadirectlinkwiththedigestiveactivityandsubstantiateweight.Lipidcomposit

4、ionshowsalargedominanceoftheideaofahighphysiologicalturnoverasanalternativestructuralpolarlipids.Neutrallipidsweredominatedbytolargelipidaccumulation.Thefattyacidandsterolpro-sterolswithlowlevelsofacylglycerolsandfreefattyacids.filesareconsistentwithadiversephyto

5、planktondiet,andaPhospholipidsshowadominanceofPCwithintermediatestrongcontributionofphospholipidclassestoenergypercentagesofPEandDPG.Otherconstituents(PS,PI,needs,includinglocomotion.LPC,sphingolipids)werepresentatlowerlevels.FattyacidcompositionofDAGandTAGshowe

6、dadominanceofsaturatedacids(16:0,14:0),DHAandintermediatelevelsofMUFA.PhospholipidsweredominatedbyDHAIntroductionwithvaluesexceeding30%oftotalFAinallcategoriesexceptforPI,wherelowerpercentagesoccurred.SaturatedPyrosomasareasmallgroupofholoplanktonictunicates,aci

7、dsweresecondinabundancewithMUFAshowingcurrentlyincludingonly8describedspeciesand3generaintermediateconcentrations.Sterolsweredominatedby24-[1].Theyarerestrictedtothewarmeropenoceanwaters,omethylcholesta-5,22E-dien-3b-olwithmorethan22%ofbetweenapproximately50°Nan

8、d50Sinalloceans[2].thetotalsterol.Cholesterol(cholest-5-en-3b-ol)repre-Ourknowledgeofthelipidcompositionintunicatesre-sentedonly12%ofthetotalwhile24-methylcholesta-ma