Abstract
Alstonia scholaris (L.) R. Br, commonly known as saptaparna is an evergreen tropical tree of medicinal value. In this study, the floral volatile oil composition and antibacterial activity of A. scholaris collected in the morning and evening times were investigated. A total of thirty-six constituents, forming 81.1-83.7 % of total composition were identified. The oil was characterised by the presence of a higher amount of oxygenated monoterpenes (60.3-66.7 %), followed by benzenoids (9.2-9.9 %). Major components of the oil were linalool (13.6-14.3%), cis-linalool oxide (furanoid) (7.3-12.2 %), trans-linalool oxide (furanoid) (7.0-7.5 %), cis-linalool oxide (pyranoid) (3.3-7.2 %), trans-linalool oxide (pyranoid) (3.8-4.7 %), terpinen-4-ol (7.9-10.6 %), and α-terpineol (6.3-6.6 %). The oil showed moderate to good activity against Salmonella typhimurium (MTCC 98), while it showed moderate activity against Escherichia coli (MTCC 739). It can be concluded that the collection time influenced the yield and chemical composition of A. scholaris floral volatiles.
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