![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
ABSTRACT
Composition of the heartwood oil of Thuja occidentalis L. was investigated by a combination of capillary GC (retention indices) and GC/MS. The oil was obtained by steam distillation of various lots of waste residues from cedar shingle industries. Twelve out of 20 observed compounds were identified. Monooxygenated sesquiterpene compounds are the most important components (80% of the total). Occidentalol is the main component: its relative concentration varies between 20% and 50%, depending on the isolation parameters. This concentration decreased as the isolation proceeded, typically from 40–50% to 10–20% between 1 and 5 hours of distillation. Three occidol isomers, occidenol, and α-, β- and gamma;-eudesmols were also observed in relative concentrations of 4% to 12%. The monoterpene family is represented by terpinen-4-ol, and carvacrol. α-Thujaplicin, a tropolone derivative, is also among the products. The relative concentration of thujaplicin decreased from 5% to 0% between 1 and 5 hours of distillation.