Linalool from Lippia alba: study of the reproducibility of the essential oil profile and the enantiomeric purity.
A new chemotype of the aromatic Verbenaceae species Lippia alba Mill. N. E. Br. from southeastern Brazil has recently been shown to have a high content of linalool in the leaf essential oil. Vegetative propagation of this chemotype was conducted at six different locations in Brazil, and the variation of the content and the optical purity of linalool in the oils were verified. Yields (0.6-0.9%, hydrodistillation), chemical composition, linalool content, and optical purity of the oils from all the plants were compared, using GC-FID, GC-MS, chiral chromatography, and retention index calculation. No plant exceeded the matrix in linalool content (46.5 to 90.7%), and the chemical profile of the oils was the same for all the samples. Purification of linalool to a content close to 100% was effected by vacuum distillation of the crude oil. Chiral analysis showed exclusively the presence of S-linalool in all the crude oils and in the distilled samples.
Siani
Antonio C
AC
Laboratório de Química de Produtos Naturais, Instituto de Tecnologia em Fármacos, Fundação Oswaldo Cruz, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro, RJ, Brazil, 21041-250. siani@far.fiocruz.br
Tappin
Marcelo R R
MR
Ramos
Mônica F S
MF
Mazzei
José L
JL
Ramos
Maria Conceição K V
MC
De Aquino Neto
Francisco R
FR
Frighetto
Nélson
N
D000080462:Acyclic Monoterpenes; D001938:Brazil; D002849:Chromatography, Gas; D039821:Monoterpenes; D009822:Oils, Volatile / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry*; D013237:Stereoisomerism; D013729:Terpenes / Q000032:analysis / Q000737:chemistry*; D029648:Verbenaceae / Q000737:chemistry*
D000080462:Acyclic Monoterpenes; D039821:Monoterpenes; D009822:Oils, Volatile; D010938:Plant Oils; D013729:Terpenes; C018584:linalool