DIGEST JOURNAL OF NANOMATERIALS AND BIOSTRUCTURES, ISSN: 1842-3582, Volume: 9, Issue: 3, Pages: 935-941, Published: JUL-SEP 2014

Abstract: The aim of the study was the recording and interpretation of the MS fragmentation spectrum for alpha-zingiberene [S-(R*,S*)]-5-(1,5-dimethylhexen-4-yl)-2-methyl-1,3-cyclohexa-1,3-diene. The mass spectra are line spectra (peaks) which contain signals, such as the line of the molecular ion, isotopic lines, base line, and lines generated by the fragmentation of the molecular ion (fragmentation peaks). The highest peak of the mass spectra of this research is alpha-zingiberene; base peak that corresponds to the long life ions which reach the detector in the highest amount. Alpha-zingiberene is identical to the molecular peak (it can be a peak generated through the fragmentation of the molecular ion M+). The relative percentage intensity I% is considered 100% for alpha-zingiberene, and the relative intensities of the other peaks are determined relative to the base peak. Knowing the relative percentage intensity allows knowing the relative percentage abundance for each species of ions in the mass spectra. For spectra obtaining was used an ion trap spectrometer, capable of recording sequential ionization spectra, before reaching the MS11. It was recorded and interpreted the fragmentation spectrum for alpha-zingiberene. For each fragment, the ionic or radical-ionic character was indicated.