Diurnal and seasonal variation of the essential oil labdanes and clerodanes from Cistus monspeliensis L. leaves

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

“…São relatadas, por ex., variações sazonais no conteúdo de praticamente todas as classes de metabólitos secundários, como óleos essenciais [11][12][13][14][15] , lactonas sesquiterpênicas 16,17 , ácidos fenólicos 16,18 , flavonóides [19][20][21][22][23][24][25] , cumarinas 21 , saponinas [26][27] , alcalóides 1,[28][29][30][31] , taninos [32][33][34][35][36] , graxas epicuticulares 37 , iridóides 22,38,39 , glucosinolatos 40,41 e glicosídeos cianogênicos 42,43 .…”

“…Existem, também, cada vez mais estudos mostrando que a composição de metabólitos secundários de uma planta pode variar apreciavelmente durante o ciclo dia/noite, tendo sido descritas, por ex., variações circadianas nas concentrações de óleos voláteis 12,14,[56][57][58] , iridóides 38 , alcalóides 1,2,59-61 , glucosinolatos 62 , glicosídeos cianogênicos e tiocianatos 63 .…”

Diurnal Effects on Chinese Wild <i>Ledum palustre</i> L. Essential Oil Yields and Composition

“…However, in a diurnal study with Rosa damascena Mill., Kumar et al [15] found the highest essential oil content at 04:00 AM and the lowest at 2:00 PM. Angelopoulou et al [19] reported that in Cistus monspeliensis L. leaves during the months of May, August, and February, oil yield was the highest at 6:00 PM, whereas in November, the oil yield was the highest at 12:00 PM. Indeed, Lawrence [32] …”

“…[17], oil-bearing rose (Rosa damascene Mill. ) [18], dill Cistaceae (Cistus monspeliensis) [19], lavender (Lavandula angustifolia Mill. ) [20], Eucalyptus spp.…”

Quantitative HPLC analysis of sesquiterpene lactones and determination of chemotypes in Eremanthus seidelii MacLeish & Schumacher (Asteraceae)

“…[3][4][5][6][7][8][9] Some of the SL isolated from the Eremanthus genus posses important biological activities, 3,[6][7][8]10 like the antiproliferative effects on some cancer cell lines 11 and the modulation of the inflammatory process in vitro, by inhibiting the NF-κβ transcriptor factor. 12 Seasonal, [13][14][15][16] circadian [17][18][19] and populational [20][21][22][23][24] variations in the content of almost all classes of secondary metabolites, including SL, [25][26][27][28][29] were reported. The recognition of variations in secondary metabolite production can be helpful in chemotaxonomic studies, specially for the determination of qualitative and quantitative chemical markers that could be applied to establish chemotypes and as additional taxonomic characters for the definition of complex taxa.…”