Identification of Conjugated Triene Oxidation Products of .alpha.-Farnesene in Apple Skin

摘要: Conjugated triene oxidation products of the sesquiterpene α-farnesene, implicated as causal agents storage disorder superficial scald, were extracted from apple skin wax and separated by GC-MS normal reversed phase HPLC. 2,6,10-Trimethyldodeca-2,7(E),9(E),11-tetraen-6-ol (2b) was major (88-95% total) present in HPLC but accounted for only 12-35% concentration washes measured UV spectroscopy. Concentrations 2b up to 1.2 μg/cm 2 surface area on five varieties examined. The 9Z isomer constituted remaining 5-11% content most samples. 6-Hydroperoxy-2,6,10-trimethyldodeca-2,7(E),9(E),11-tetraene (2a) its isolated autoxidized samples α-farnesene identified at minor contributors (<5%) skin. On standing, 2a converted a more polar uncertain structure which identical with (0-4%) found