Abstract
The composition of seed and cake volatiles of Pongamia pinnata (L) Pierre extracted by solid phase micro extraction was analyzed by GC and GC-MS. A total of 84 and 81 volatile compounds were identified from the headspace samples of seed and cake, respectively. The volatiles belonged to ten major groups of compounds comprising hydrocarbons (aliphatic and aromatic), terpenoids, alcohols, phenols, aldehydes and ketones, acids, esters, oxo compounds, sulphur compounds and nitrogen compounds. The most abundant individual compound present in the volatile fraction of both seed and cake was 2-chloroacetophenone (19.58% and 19.47%, respectively). Significant differences in the proportion of sulphur compounds, phenols and nitrogenous compounds between seed and cake were observed while there were little differences in others. The study found several compounds in the volatile fractions of both seed and cake reported to have an adverse effect on pests and pathogens of crops. This finding provides the first experimental evidence for the use of Pongamia volatiles as a bio-pesticide for crop protection.
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