Volatile Components of Bartlett Pear. V.

Abstract

SUMMARY The volatile essence of fresh, ripe Bartlett pears was separated into individual compounds by repetitive gas‐liquid chromatography. Techniques used for characterization included retention data; infrared, ultraviolet, nuclear magnetic resonance, and mass spectroscopy; melting points, and formation of appropriate derivatives. The compounds identified include: ethanol, n‐propanol, n‐butanol, n‐pentanol, n‐hexanol, n‐octanol; methyl, ethyl, n‐propyl, n‐hutyl, n‐pentyl; n‐hexyl, n‐heptyl, and n‐octyl acetate; and the methyl and ethyl esters of n‐octanoic, 3‐hydroxyoctanoic, trans :2‐octenoic, n‐decanoic, cis:4‐decenoic, trans:2‐decenoic, trans :2‐cis:4‐decadienoic, and trans:2‐trans:4‐decadienoic acids. Possible biosynthetic pathways for the formation of the higher‐boiling methyl and ethyl esters are discussed.

Changes in the volatile composition of La France pear during maturation

“…Ethyl (E), (Z)-deca-2,4-dienoate was found to be a character impact compound (Jennings et al 1964). The methyl and ethyl esters of 3-hydroxyoctanoic, (Z)-oct-4-enoic, (E)-oct-2-enoic, (Z)-dec-4-enoic and (E)-dec-2-enoic acids were identified as characteristic compounds of Bartlett pear fruit (Heinz and Jennings 1966). Changes in the composition of aroma compounds during maturation of Bartlett and Passe Crassane pears were studied, and 19 components (including 14 esters) were measured at several maturation stages (Strandjev 1975).…”

Sulphur Compounds and some Uncommon Esters in Durian (Durio zibethinus Murr.)

“…Butyl ethyl disulphide (5) 1-(Methylthi0)-1 -(propylthio)ethane (19) 3,5-Dime1hyl-1,2,4-trithiolane (2 isomers. 40)…”

Über die Biogenese von Aromastoffen bei Pflanzen und Früchten, XVII* Anabole Leistung von Erdbeerfruchtgewebe bei der Biosynthese von Aromastoffen / On the Biogenesis of Aroma Compounds in Plants and Fruits, XVII * Anabolic Properties of Strawberry Fruit Tissue for the Biosynthesis of Aroma Compounds

“…Während der Seneszenz von Früchten ist der Ablauf von Reaktionsketten offenbar zunehm end gestört, so daß auch Interm ediate der /7-Oxidation der Fettsäuren in freier Form auftreten können [20]. Tressl u. Drawert haben bei Erdbeerscheibchen eine Resorption von [8-l4C]Octansäure und anschließende Metabolisierung zu 2-Heptanon, 1-Octanol und zu Octansäureestern beobachtet [21].…”