TY - JOUR

T1 - Analysis of oxylipins by high-performance liquid chromatography with evaporative light-scattering detection and particle beam-mass spectrometry

AU - Rehbock, Bettina

AU - Gansser, Dietmar

AU - Berger, Ralf G.

N1 - Funding information: The authors are greatly indebted to H.W. Gardner, National Center for Agricultural Utilization Research, Peoria, Illinois, USA, for providing mass spectrometry spectra and to M. Hamberg, Karolinska Institutet, Stockholm, Sweden, for helpful correspondence. This work was supported by the EU project AIR3-CT94-2060 and by the Fonds der Chemischen Industrie, Frankfurt.

PY - 1997/9/1

Y1 - 1997/9/1

N2 - The metabolism of 13S-hydroperoxy-9Z, 11E, 15Z-octadecatrienoic acid was investigated in a crude enzyme extract from mung bean seedlings (Phaseolus radiatus L.). Hydroperoxide-metabolizing activity was mainly due to a hydroperoxide lyase and, to a lesser extent, to an allene oxide synthase and a peroxygenase. Oxylipins originating from hydrolysis and cyclization of the allene oxide synthase product 12,13-epoxy-9Z, 11, 15Z-octadecatrienoic acid and from peroxygenase catalysis were identified by high-performance liquid chromatography (HPLC) particle beam-mass spectrometry (PB-MS) and quantified by normal-phase HPLC with an evaporative light-scattering detector (ELSD). An advantage of this methodology was the possibility to avoid extensive derivatization procedures commonly used for the gas chromatographic analysis of oxylipins. Owing to a comparable sample inlet system, the ELSD served an important analytical pilot function for the PB-MS: Qualitatively identical chromatographic patterns were obtained with both detection systems. The HPLC system enabled the separation of methyl 12-oxo-phytodienoate, methyl 11- hydroxy-12-oxo-9Z, 15Z-octadecadienoate, methyl 12-oxo-13-hydroxy-9Z, 15Z- octadecadienoate, methyl 9-hydroxy-12-oxo-10E, 15Z-octadecadienoate, methyl 13-hydroxy-9Z, 11E, 15Z-octadecatrienoate, methyl 15,16-epoxy-13-hydroxy-9Z, 11E-octadecadienoate, and methyl 13-hydroperoxy-9Z, 11E, 15Z- octadecatrienoate on a Lichrospher DIOL column within 33 rain. Compared with a diode array detector, the ELSD proved to be more sensitive in the case of methyl 12-oxo-13-hydroxy-9Z, 15Z-octadecadienoate by a factor of about 15. In addition volatile metabolites were analyzed by capillary gas chromatography. The yield of the hydroperoxide lyase product 2E-hexenal was 49%, whereas the sum of oxylipins reached about 15%.

AB - The metabolism of 13S-hydroperoxy-9Z, 11E, 15Z-octadecatrienoic acid was investigated in a crude enzyme extract from mung bean seedlings (Phaseolus radiatus L.). Hydroperoxide-metabolizing activity was mainly due to a hydroperoxide lyase and, to a lesser extent, to an allene oxide synthase and a peroxygenase. Oxylipins originating from hydrolysis and cyclization of the allene oxide synthase product 12,13-epoxy-9Z, 11, 15Z-octadecatrienoic acid and from peroxygenase catalysis were identified by high-performance liquid chromatography (HPLC) particle beam-mass spectrometry (PB-MS) and quantified by normal-phase HPLC with an evaporative light-scattering detector (ELSD). An advantage of this methodology was the possibility to avoid extensive derivatization procedures commonly used for the gas chromatographic analysis of oxylipins. Owing to a comparable sample inlet system, the ELSD served an important analytical pilot function for the PB-MS: Qualitatively identical chromatographic patterns were obtained with both detection systems. The HPLC system enabled the separation of methyl 12-oxo-phytodienoate, methyl 11- hydroxy-12-oxo-9Z, 15Z-octadecadienoate, methyl 12-oxo-13-hydroxy-9Z, 15Z- octadecadienoate, methyl 9-hydroxy-12-oxo-10E, 15Z-octadecadienoate, methyl 13-hydroxy-9Z, 11E, 15Z-octadecatrienoate, methyl 15,16-epoxy-13-hydroxy-9Z, 11E-octadecadienoate, and methyl 13-hydroperoxy-9Z, 11E, 15Z- octadecatrienoate on a Lichrospher DIOL column within 33 rain. Compared with a diode array detector, the ELSD proved to be more sensitive in the case of methyl 12-oxo-13-hydroxy-9Z, 15Z-octadecadienoate by a factor of about 15. In addition volatile metabolites were analyzed by capillary gas chromatography. The yield of the hydroperoxide lyase product 2E-hexenal was 49%, whereas the sum of oxylipins reached about 15%.

UR - http://www.scopus.com/inward/record.url?scp=0030885365&partnerID=8YFLogxK

U2 - 10.1007/s11745-997-0130-0

DO - 10.1007/s11745-997-0130-0

M3 - Article

C2 - 9307943

AN - SCOPUS:0030885365

VL - 32

SP - 1003

EP - 1010

JO - LIPIDS

JF - LIPIDS

SN - 0024-4201

IS - 9

ER -