Phytochemical and antimicrobial studies on Artemisia monosperma

Antibacterial Ellagic Acid Derivatives and Other Constituents from Pancovia pedicellaris

“…(Table 1) which were connected by a 1 H-1 H COSY spectrum. In addition, the set of chemical shifts observed at δ = 100.7, 70.9, 70.8, 72.3, 69.0, and 18.5 (C-1 to C-6 ) resembled the corresponding signals of substituted rhamnose glycosides [18]. The anomeric protons (H-1 , H-1 ) of the sugar units were observed at δ = 5.46 (d, J = 7.5 Hz, H-1 ) and 5.26 (d, J = 1.3 Hz, H-1 ) and attributed to glucose and rhamnose, respectively.…”

“…It responded positively to the Molish test, suggesting its glycoside nature. Its UV spectrum (λ max = 255, 360 nm) was similar to that of ellagic acid derivatives, suggesting that compound 2 like compound 1 had an ellagic acid skeleton [18,19]. The IR spectrum displayed characteristic absorptions for hydroxy groups (3430 cm −1 ) and lactone functions (1749 cm −1 ), aromatic C=C groups (1600 cm −1 ), and glycosidic C-O bonds (1090 cm −1 ).…”

“…This process yielded tives, suggesting that this compound has an ellagic acid skeleton [18,19]. The IR spectrum displayed characteristic absorptions for hydroxy groups (3420 cm −1 ), lactone functions (1748 cm −1 ), aromatic C=C groups (1611 cm −1 ), and glycosidic C-O bonds (1085 cm −1 ).…”

“…The anomeric protons (H-1 , H-1 ) of the sugar units were observed at δ = 5.46 (d, J = 7.5 Hz, H-1 ) and 5.26 (d, J = 1.3 Hz, H-1 ) and attributed to glucose and rhamnose, respectively. The values of the coupling constants suggest the β configuration for glucose [8] and α for rhamnose [18]. The junction between the rhamnose and glucose and between the glucose and the ellagic acid moiety were made using the correlations observed in the HMBC spectrum (Fig.…”

Dialiumoside, an Olean-18-ene Triterpenoid from Dialium excelsum

“…The sugar unit was easily determined as L-rhamnose by analysis of chemical shifts and coupling constant patterns of its proton signals (Table 1) determined in a 1 H-1 H COSY spectrum. In addition, the set of chemical shifts observed at δ = 103.2, 71.9, 71.5, 73.4, 68.8, and 17.3 (C-1 to C-6 respectively) ( Table 1) resemble those of the corresponding signals of rhamnose glycoside [17]. The anomeric proton (H-1 ) of the rhamnose sugar unit was observed at δ = 4.75 (d, J = 1.3 Hz).…”