Chemical Composition and Allelopathyc Activity of Essential Oil of Lippia sidoides Cham

Abstract

The allelopathy is a process for which products of the secondary metabolism, as terpenes phenolic, of a certain vegetal intervene significantly, generally of antagonistic form, in the development of other species of plants. The objective of this work was to chemically characterize the essential oil of Lippia sidoides Cham. growing in the Cariri cearense region, Brazil, and evaluate the allelopathyc effect of this oil on the germination of lettuce (Lactuca sativa L.), arugula (Eruca sativa Mill.), and cauliflower (Brassica oleracea L.), in pre-plantation application. The monoterpene thymol (84.90%) has been identified as the principal constituent in the essential oil. The experiment was done in randomized complete block, in 4 × 3 factorial; being used four essential oil combinations applied in three different species in pre-plantation applications. Emergence velocity index (EVI), germination percentage and mean time to germination (MTG), had been analyzed through daily counting carried out until the 14 th day after sowing. Through qualitative analysis performed by gas chromatography coupled with mass spectrometry (GC/MS) were identified seven chemical constituents representing 97.82% of essential oil of L. sidoides, being that the constituent present in greater concentration in oil was the thymol (84.90%). Could be verified the occurrence of the negative allelopathyc effect of lettuce crop, because its present low EVI and greater MTG, for the other vegetable species there were no allelopathic effect.

Factors Affecting the Retention Efficiency and Physicochemical Properties of Spray Dried Lipid Nanoparticles Loaded with Lippia sidoides Essential Oil

“…Lippia sidoides, belonging to the genus Lippia [37,38], is a typical herb species of Northeast Brazil widespread used in traditional medicine; it is known in Brazil as "alecrim-pimenta" (pepper-rosemary). The main bioactive compounds in the EO of Lippia sidoides are monoterpenes, like thymol, p-cymene, myrcene, and the sesquiterpene, as caryophyllene [39][40][41]. These compounds are responsible for the biological properties of this EO, i.e., antimicrobial, antinociceptive, anti-inflammatory, and antioxidant activities [42][43][44].…”

Using Micropropagation to Develop Medicinal Plants into Crops

“…Lippia origanoides) varied according to cultivation sites. Thymol is the major component of essential oil extracted from crops grown in northeast Brazil [50][51][52], whereas carvacrol is the major component present in L. sidoides harvested from Lavras, Minas Gerais [53] and 1.8-cineole, isoborneol, and bornyl acetate in São Gonçalo do Abaeté, Minas Gerais, Brazil. Standardized essential oil of L. sidoides is recommended for topical applications on skin, mucous membranes, mouth, throat and vaginal washings as antiseptic [45].…”