Dem IPB wird erneut ein beispielhaftes Handeln im Sinne einer chancengleichheitsorientierten Personal- und Organisationspolitik bescheinigt. Das Institut erhält zum 6. Mal in Folge das TOTAL E-QUALITY…
Die Plant Science Student Conference (PSSC) wird seit 20 Jahren im jährlichen Wechsel von Studierenden der beiden Leibniz-Institute IPK und IPB organisiert. Im Interview erläutern Christina Wäsch…
Conjugates of 3,7‐trans cucurbic acid isomers with either (S )‐ or (R )‐isoleucine were synthesised from the diastereomeric conjugate of (3R , 7R )‐jasmonic acid and (3S , 7S )‐jasmonic acid by sodium borohydride reduction. The resulting diastereomers were characterised by nuclear magnetic resonance spectra. The authentic substances were subjected to liquid chromatography using a reversed‐phase C18 matrix and the chiral stationary phase Chiralpak AS. For all (6RS )‐hydroxy epimeric pairs, a baseline separation could be observed. The elution sequences obtained indicate that the 3,6‐trans oriented epimers with (S )‐isoleucine elute prior to the 3,6‐cis configured individuals independent of the mode of chromatography. In contrast, the elution pattern of the conjugates containing (R )‐isoleucine was reversed on the chiral stationary phase. The epimers with a 3,6‐cis configured hydroxy group and the acid side chain eluted faster than those with the 3,6‐trans configuration. The chromatographic conditions described are suitable for resolving mixtures of isomeric N‐(cucurbinoyl)‐isoleucines in order to assign their stereochemistry and to obtain chiral reference materials on a preparative scale.