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--- inga_marginata_willd [2021/06/08 13:03]
andreas angelegt
+++ inga_marginata_willd [2021/06/08 13:17] (aktuell)
andreas
@@ Zeile 10: / Zeile 10: @@
 {{:4mmp.png| 4-mercapto-4-methylpentane-2-one}}  4-mercapto-4-methylpentane-2-one (4-MMP)
-"The bottle-brush-like white inflorescences covering these trees emit an extremely diffusive fruity-floral scent which is characterised by a strong blackcurrant note, the latter showing a tendency to cat urine, if the nose is too close. This note could be localised by sniffing at the exit of the GC and, after pre-concentration of the corresponding region, a mass spectrum could be recorded which was identical to that of 4-mercapto-4-methyl-pentan-2-one, the adduct of hydrogen sulfide to mesityloxide. This mercapto-ketone     shows an extremely low perception threshold of around 0.05ng/l air and has been described as an aroma impact product of sauvignon wines. Furthermore, it has been identified as one of the many compounds formed during Maillard reactions involving cysteine, ribose and phospholipid." \\
+"The bottle-brush-like white inflorescences covering these trees emit an extremely diffusive fruity-floral scent which is characterised by a strong blackcurrant note, the latter showing a tendency to cat urine, if the nose is too close. This note could be localised by sniffing at the exit of the GC and, after pre-concentration of the corresponding region, a mass spectrum could be recorded which was identical to that of 4-mercapto-4-methyl-pentan-2-one, the adduct of hydrogen sulfide to mesityloxide. This mercapto-ketone     shows an extremely low perception threshold of around 0.05ng/l air and has been described as an aroma impact product of sauvignon wines. Furthermore, it has been identified as one of the many compounds formed during Maillard reactions involving cysteine, ribose and phospholipid." Main components of the floral scent, trapped on Porapak, were caryophyllene (47.2%), E-ocimene (17.0%), linalool (6.9%), and the linalool oxides (cis+trans furanoid and pyranoid). Minor components were e.g. mesityl oxide (0.2), 4-mercapto-4-methylpentane-2-one (0.00001%), 2-methyl butyraldehyde oxime (0.3%), 2-methyl butyraldehyde oxime methyl ether (0.2%), 2-methyl butyronitrile (0.05%), and 2-methylpropionaldehyde oxime methyl ether (0.2%).  \\
 [Kaiser, Roman. „Scents from rain forests.“ CHIMIA International Journal for Chemistry 54.6 (2000): 346-363]

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