Composition of the essential oil of Ocimum canum grown in Rwanda

ArticleinPharmaceutisch Weekblad Scientific Edition 7(6):273-6 · January 1986with27 Reads
DOI: 10.1007/BF01959201 · Source: PubMed
Abstract
The essential oil from leaves and flowers of Ocimum canum Sims, growing wild in Rwanda, was investigated by LSC, GLC and GC-MS. All samples were characterized by a high content of linalool (60-90%). Neither camphor nor citral and methyl cinnamate, compounds reported to be characteristic for different types of O. canum, could be detected. All monoterpene hydrocarbons were present in minor amounts (less than 1.5%). The oil samples with the lowest linalool content consisted of relatively large amounts of sesquiterpene hydrocarbons such as bergamotene (about 10%) and beta-caryophyllene (about 5%). Oct-1-en-3-ol and 3-octanol were the only oxygen-containing components, besides linalool, that amounted to more than 1% in most of the oil samples.

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  • ... In this respect, both the Sierra Leone and Nigeria O. americanum L. leaf materials were thus identified as the linalool chemotype, constituting 49.1% and 39.6% respectively, in the present study. This chemotype of O. americanum L. is consistent with those previously reported in Benin[14], Rwanda[15], Cameroon[6]and Brazil[16]. The high content of linalool in some varieties of O. ...
  • ... The More recently, the two chemotypes (thymol and eugenol) were described from samples collected in Cameroon and assessed for the antioxidant and antifungal activities of their essential oils (Hzounda Fokou et al. 2014). Various chemotypes were previously described for O. canum samples from different geographical origins; the most often described were rich in camphor that explains a previous appellation of this species as "camphor basil" (Chagonda et al. 2000); nevertheless, some samples with a high content of linalool were described in Cameroon ( Tchoumbougnang et al. 2009) and Rwanda ( Ntezurubanza et al. 1985); methyl cinnamate was the major component of a sample from Sao Tome ( Martins et al. 1999) while citral characterized a sample from Thailand ( Bunrathep et al. 2007); finally, methyl chavicol and linalool were the main chemical components of a Brazilian sample (Nascimento Jeferson et al. 2011). The essential oil of O. canum described in this study is completely different, characterized by a high content of 1,8-cineole (70.2 %); a similar composition was previously described by our team with a sample collected in Cameroon which differed nevertheless by a high content of (Z)-β-ocimene ( Tchoumbougnang et al. 2006); an essential oil obtained from leaves and flowers of O. canum from Burkina Faso contained 60.1 % of 1,8-cineole ( Bassole et al. 2005); finally, three chemotypes were described for O. canum collected in different localities of Ivory Coast, among which two were characterized by 1,8-cineole/camphor and 1,8-cine- ole/bornyl acetate, respectively ( Tonzibo et al. 2008). ...
  • ... Some of such chemotypic entries include terpenen-4-ol type from O. canum and thymol type from O. gratissimum (Sanda et al. 1998; Yusuf et al. 1998; Keita et al. 2000); geranyl acetate type from O. minimum (Ozcan and Chalchat, 2002); citral and camphor types from O. americanum (Mondello et al. 2002); and p-cymene type from O. suave (Keita et al. 2000). A report on the chemical constituents in O. canum from Rwanda indicated the oil to be composed of 60-90 percent linalool (Ntezurubanza et al. 1985). There is a substantial wealth of literature on the chemical composition and biological activities of basil. ...
  • ... While trans-β-bergamotene (8.2 %), terpinen-4-ol (5.9 %) and epi-α-muurolol (5.4 %) were noted as minor components. Although, The last chemotype is comparable to the oils composition noted by several authors [14][15][16][17][24][25][26] , the presence of eugenol as main component in our sample markes a chemical difference. ...
  • ... Il s'agit des propriétés antimicrobiennes (Janssen, 1989; Baba-Moussa, 1997 ; Oussou et al., 2004), répulsives et larvicides de Ocimum canum Sims (Lukwa, 1994). L'étude de la composition chimique des huiles essentielles a permis de décrire plusieurs chémotypes de la plante dont les plus importants sont: linalol (88%) au Rwanda (Ntezurubanza et al., 1985), eugénol (67%) au Nigeria (Ekundayo et al., 1989 ), αterpinéol/camphre (63,1%) au Mali (Chalchat et al., 1995), camphre (60%) en Guinée (Nianga et al., 1995), 1,8-cinéole (60,1%) au Burkina Faso (Bassole et al., 2001aBassole et al., , 2005b Stewart et al., 2008) ettrans-méthylcinnamate (79,7%) à Sao Tomé (Martins, 1999). Une variété de chémotypes en fonction du lieu de récolte a été décrite au Togo (Sanda et al., 1998) : un type à terpine-4-ol (24,0 à 34,8%)/γ-terpinène (10,1 à 13,2%), un type à linalol (29,4 à 60,6%)/(E)-α-bergamotène (11,3 à 13,6%)/β-caryophyllène (8,9 à 11,6%) et un type à terpine-4-ol (14,5 à 32,2%)/bicyclogermacrène (8,7 à 12,2% ) (E)α-bergamotène (9,2 à 21,4%), et dans l'île de la Grande Comore(Hassane et al., 2011) : un type à 1,8-cinéole (48,88%)/camphre (14,98%) et 1,8-cinéole (34,22%)/camphre (13,69%)/propanoate d'isopropyle (9,13%). ...
    ... Ces différents chémotypes n'ont encore jamais été décrits au Bénin. Cette variation de chémotypes observée sur le même site au cours de la journée peut s'expliquer par l'interconversion d'un composé en un autre sous l'effet des rayons solaires (Poulose and Croteau, 1978; Yayi et al., 2001) et justifie en partie la variété de chémotypes décrit pour cette espèce à travers la littérature au Bénin (Yayi et al., 2001) et dans d'autres pays comme le Togo, le Rwanda (Ntezurubanza et al., 1985), le Nigeria (Ekundayo et al., 1989), le Mali (Chalchat et al., 1995), la Guinée (60%) (Nianga et al., 1995), le Burkina Faso (Bassole et al., 2005; Goretti et al., 2008), Sao Tomé (Martins et al., 1999) et dans l'île de la Grande Comore(Hassane et al., 2011). La variation des composés majoritaires de Ocimum canum est différente de celle décrite pour l'Ocimum gratissimum du Bénin (Yayi et al., 2004) mais proche de celle décrite par De Vasconcelos et al. (1999) pour cette même plante au Brésil. ...
  • ... Antitubercular activity against Mycobacterium spp was found at a concentration of 100 ppm. The oil has antifungal activity against a great number of fungi including some human pathogens (Ntezurubanza et al, 1986). ...
  • ... Some of such chemotypic entries include terpenen-4-ol type from O. canum and thymol type from O. gratissimum (Sanda et al. 1998; Yusuf et al. 1998; Keita et al. 2000); geranyl acetate type from O. minimum (Ozcan and Chalchat, 2002); citral and camphor types from O. americanum (Mondello et al. 2002); and p-cymene type from O. suave (Keita et al. 2000). A report on the chemical constituents in O. canum from Rwanda indicated the oil to be composed of 60-90 percent linalool (Ntezurubanza et al. 1985). There is a substantial wealth of literature on the chemical composition and biological activities of basil. ...
  • ... cological point of view, it was found that the essential oil obtained from, B. subtilis, B. pumilus, Vibrio cholerae, Staph. albus, Sal. paratyphi and Xanth. campestris. Also O. americanum oil showed antifungal activity against a great number of fungi which included some human pathogens. The antimicrobial activity of O. americanum oil was studied . [1] The black cutworm, Agrotis ipsilon ( Huf.) is one of the most severe insect pests in Egypt, this noctuid is polyphagous and attacks a large number of field and vegetable crops. The growers usually use the conventional insecticides, especially organophosphates, in controlling this pest. However, the use of pesticides has resulted in envi ...
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