A New Tetrahydropyrano[3,4-c]pyran-1(3H)-one Iridoid from Viburnam cylindricum

Abstract

From ethanolic extract of Viburnam cylindricum plant a (4aS, 5R, 6S)-6-(3,4,5-trihydroxy-6(hydroxymethyl) tetrahydro-2H-pyran-2-yloxy)-5-vinyl-4,4a,5,6-tetrahydropyrano[3,4-c]pyran-1(3H)-one Iridoid have been isolated and characterized with help of 1 H, 13 C NMR, 1 H-1 H COSY, DEPT and HMQC studies. This is new studies in chemical analysis of Viburnam cylindricum.

Comparative Study of Antioxidant Activity of Different Extracts and Essential Oil Compositions Obtained from Artemisia sieberi Besser using Two Different Methods

“…The major components in the HDEO were found to be verbenol (16.09 %), myristicin (13.76%,), E-epoxy ocimen (9.77%) and α-phellandren-8-ol (7.44%). These are very different from the other reported components detected in A. siberi of other locations (10,11,13) these components are also , very different from those of SDEO with E-epoxy ocimen (14.02 %), verbenol (13.93%), artemiseole (10.25%) and camphor (8.89%) as the majors. As can be seen, although total number of components detected in both mentioned essential oils were almost equal, their types and percentages were very different (Table 1); for example some compounds such as lavandulol (0.78%), cis chrysanthenol (1.83%), p-cymen-8-ol (0.92%), cis carvone oxide (1.65%) caryophyllene oxide (1.17%) and 6,10,14-trimethyl 2-pentadecanone, (1.35%) detected in HDEO, were not seen in SDEO.…”

“…Antidiabetic, antimalarial and antimicrobial effects of this plant have been reported previously [7][8][9][10][11] .…”

Extraction of Essential Oil from Cinnamon (Cinnamomum zeylanicum)

“…Analytes with medium to low volatility which may play a role for the aroma and quality of oil extracted from the plant material are extracted with this technique [5][6][7] . The correct choice of solvent is important in order to obtain a good yield from the extraction as well as to prevent the loss of volatiles.…”

“…The recovered sample is diluted and has to be concentrated further, by evaporation. It is during this step that loss of volatiles can take place [5][6][7] .…”

Biological activity and isolation of compounds from stem bark of Plumeria acutifolia

“…[ 33 34 ] The signal at d 4.35 (2H, m , H-7) was assigned to the proton of C-7 by comparative analysis with reported data. [ 35 36 ] In addition, there are two double doublets at d 5.31 (1H, dd , J = 2.0, 16.8 Hz, H-10a, trans ) and d 5.26 (1H, dd , J = 2.0, 9.0 Hz, H-10b, cis ) that were assigned to two protons of methylene group. Furthermore, resonances for sugar moiety include an anomeric proton signal at d 4.67 (1H, d , J = 8.0 Hz, H-1`), together with five proton signals for the remaining sugar protons.…”