Composition and niticidal activity of essential oils of three chemotypes of Rosmarinus officinalis L. acclimatized in Morocco

Abstract

The essential oils of three chemotypes of rosemary (Rosmarinus officinalis L.) (Lamiaceae) were investigated in vitro for niticidal activity on Pediculus humanus capitis using two methods: microatmosphere and direct application. The results revealed the potent effectiveness of the oil of chemotype 1 (Rabat origin) using the two techniques mentioned, successively followed by the oils from chemotypes 2 (Errachidia origin) and 3 (Oujda origin). Chemical analysis (GC and GC-MS) of these oils was different. Among the main components identified, alcoholic and ketonic compounds were found the most effective on nits using the two methods. The difference in niticidal activity observed is related either to the technique used and to the chemical composition of the oils tested which is in direct relation to the geographical distribution of these chemotypes.

Plant extracts and their components as potential control agents against human head lice

“…Again, these results do not follow the expected trend in regards to lipophilicity at least for the two first compounds (Table 2). Finally, a study of the niticidal activity (by direct contact) of EO components of Rosmarinus officinalis (Lamiaceae) showed 100% mortality for linalool, borneol, b-caryophyllene, limonene and camphor, and lower activity for a-pinene and bornyl acetate (Lahlou and Berrada 2003), which have K ow values in the range of those of the more active compounds (Table 2).…”

“…Therefore, it is important to develop standardized methods of extraction, and general knowledge of important (essential) components. Several individual components of EOs, particularly monoterpenes, have been tested against lice, providing data that permit to draw preliminary conclusions about structural requirements and structure-activity relationships for anti-lice compounds (Downs et al 2000;Mougabure-Cueto et al 2002;Lahlou and Berrada 2003;Yang et al 2003Yang et al , 2004aYang et al , b, 2005. The structure, octanol-water partitioning coefficient (K ow ) and vapour pressure (Pv) of tested compounds (SciFinder Scholar 2006) are shown in Table 2.…”

Commercial opportunities for pesticides based on plant essential oils in agriculture, industry and consumer products

“…Some of the major commercial sources of essential oils (e.g., thyme, Thymus vulgaris, rosemary, Rosmarinus officinalis, and lavender, Lavendula spp.) exist as chemically distinct races, ecotypes or chemotypes (e.g., Lahlou and Berrada 2003;Kaloustian et al 2005).…”

Chemical composition and antifungal activity of <i>Piper capense</i> oil against mycotoxigenic <i>Aspergillus, Fusarium</i> and <i>Penicillium</i> species

“…Linalool has also been known to inhibit spore germination. The inhibition of sporulation appeared to arise from respiratory suppression of aerial mycelia (Lahlou and Berrada, 2001). F. avenaceum 14.3 ± 0.58 9.7 ± 0.58 9.7 ± 0.58 6.3 ± 0.58 0 ± 0.00 14 ± 0.00 66.3 F. oxysporum 11.7 ± 0.58 8.7 ± 0.58 6.3 ± 0.58 6 ± 0.00 0 ± 0.00 11 ± 1.41 66.3 F. proliferatum 17.3 ± 0.58 11.7 ± 0.58 11 ± 0.58 9 ± 0.00 6 ± 0.00 10 ± 1.41 33.1 F. merismoides 9.3 ± 0.58 8 ± 0.00 6 ± 0.00 0 ± 0.00 0 ± 0.00 13.5 ± 0.71 132.5 F. solani 14.7 ± 0.58 10.3 ± 0.58 6.3 ± 0.58 0 ± 0.00 0 ± 0.00 28 ± 1.41 132.5 F. chlamydosporum 7.7 ± 0.58 6.7 ± 0.58 6.3 ± 0.58 0 ± 0.00 0 ± 0.00 11 ± 1.41 132.5 F. subglutinans 13.7 ± 0.58 10 ± 0.00 8 ± 0.00 6 ± 0.00 0 ± 0.00 19 ±0.00 66.3 F. semitectum 10.7 ± 0.58 9 ± 0.00 7 ± 0.00 6 ± 0.00 0 ± 0.00 21 ± 2.12 66.3 F. nivale 15.3 ± 0.58 10.3 ± 0.58 8 ± 0.00 6 ± 0.00 0 ± 0.00 9 ± 0.00 66.3 F. culmorum 10.3 ± 0.58 8.3 ± 0.58 7 ± 0.00 6 ± 0.00 0 ± 0.00 12 ± 1.41 66.3 F. lateritium 7.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 0 ± 0.00 15.5 ± 0.71 265 F. scirpi 9.7 ± 0.58 7.3 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 20.5 ± 0.71 132.5 F. sporotrichoides 13.3 ± 0.58 11.3 ± 0.58 9.7 ± 0.58 7.7 ± 0.58 6 ± 0.00 12 ± 0.00 33.1 F. crookwellence 16.3 ± 0.58 9.7 ± 0.58 7.7 ± 0.58 6 ± 0.00 0 ± 0.00 34 ± 1.41 66.3 F. graminearum 10.7 ± 1.15 8.7 ± 0.58 7.3 ± 0.58 7 ± 0.00 6 ± 0.00 10 ± 0.00 33.1 F. moniliforme 15.3 ± 0.58 9.3 ± 0.58 8 ± 0.00 7 ± 0.00 6 ± 0.00 9 ±0.00 33.1 19.7 ± 1.53 6 ± 0.00 0 ± 0.00 0 ± 0.00 0 ± 0.00 17 ± 1.41 265 P. rubrum 27 ± 1.00 6.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 19 ± 0.00 132.5 P. viridicatum 10.7 ± 1.15 8.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 17.5 ± 0.71 132.5 P. rugulosum 20.3 ± 0.58 6.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 16 ± 0.00 132.5 P. cyclopium 8.3 ± 0.58 6.7 ± 0.58 0 ± 0.00 0 ± 0.00 0 ± 0.00 19 ± 0.00 265 P. expansum 11.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 0 ± 0.00 17.5 ± 0.71 265 P. claviforme 9.7 ± 0.58 8.3 ± 0.58 7 ± 0.00 6.7 ± 0.58 6 ± 0.00 17 ± 1.41 33.1 P. paxilli 9.3 ± 0.58 7 ± 0.00 0 ± 0.00 0 ± 0.00 0 ± 0.00 15 ± 0.00 265 P. ochraceum 11 ± 1.00 6 ± 0.00 0 ± 0.00 0 ± 0.00 0 ± 0.00 15 ± 0.00 265 P. digitatum 13.3 ± 2.08 6 ± 0.00 0 ± 0.00 0 ± 0.00 0 ± 0.00 18.5 ± 0.71 265 P. palitans 12.3 ± 0.58 9.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 15.5 ± 0.71 132.5 P. wortmanni 9.7 ± 0.58 7.3 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 18 ± 0.00 132.5 P. isladicum 7 ± 0.00 6.3 ± 0.58 0 ± 0.00 0 ± 0.00 0 ± 0.00 15 ± 0.00 265 P. purpurogenum 18.7 ± 0.58 9.7 ± 0.58 6 ± 0.00 0 ± 0.00 0 ± 0.00 17.5 ± 0.00 132.5…”