International Journal of Analytical Chemistry / 2010 / Article / Tab 1

Research Article

Occurrence and Sources of Triterpenoid Methyl Ethers and Acetates in Sediments of the Cross-River System, Southeast Nigeria

Table 1

Sediment samples, environmental characteristics, and triterpenoid markers in the extracts from the Cross-River estuary, Nigeria.

ZonesIIIIIIIVV

Sample codeCR-1CR-2CR-3CR-4CR-5CR-6CR-7CR-8CR-9CR-10UCR 1–10, range (ave.)GKR 1–11, range (ave.)

Location nameOron beachOku Iboku beachItu beachUpper Calabar RiverGreat Kwa River

Sample coordinates4°43.961N
8°21.327E
4°46.531N
8°18.908E
4°49.927N
8°15.501E
4°52.675N
8°12.742E
4°56.879N
8°09.334E
5°00.437N
8°07.062E
5°04.318N
8°06.250E
5°08.198N
8°04.303E
5°12.726N
8°03.491E
5°12.258N
8°00.222E
Environmental characteristicsNypa frutican with sparsely distributed Elaeis guineensis and Andropogoneae Rizophoria with sparsely distributed Elaeis guineensis and Andropogoneae Avicennia with sparsely distributed Elaeis guineensis and Andropogoneae

TOC (%)4.033.644.354.564.204.382.771.272.664.26nana
EOM (mg/kg)3000368019202950371041402650151011401850nana
THC (mg/kg)329511227185148609944162nana

Compounds (mg/kg dw)MWFormula

Taraxer-14-en-3-one424C30H48O1.92.639.61.343.81.11.050.30.391.360.3–12.8 (4.9)0.15–21.4 (10.7)

Taraxer-14-en-3β-ol methyl ether440C31H52O0.160.210.140.180.510.180.280.260.880.970.2–1.2 (0.4)0.1–0.6 (0.25)

Germanicol methyl ether440C31H52O0.050.110.070.060.17nd0.420.110.400.520.3–2.1 (0.7)0.04–1.07 (0.29)

β-Amyrin methyl ether440C31H52O0.120.170.040.060.040.080.320.180.220.36nd0.26–1.80 (0.44)

Fern-9(11)-en-3β-ol methyl ether440C31H52O0.300.320.310.380.210.22nd0.120.380.940.4–2.2 (1.1)0.01–2.35 (0.68)

α β-Amyrinyl acetates468C32H52O20.574.731.600.060.150.020.590.313.120.970.8–2.1 (0.9)0.13–1.05 (0.23)

Lupeyl acetate468C32H52O20.191.31ndndndndndnd3.05ndndnd

Germanicyl acetate468C32H52O20.110.860.05ndndndndnd0.180.02ndnd

α β-Amyrinyl hexanoates524C36H60O2nd0.320.480.03ndndndnd0.210.03ndnd

Lupeyl hexanoate524C36H60O2nd0.020.070.01ndndndnd0.02ndndnd

Abbreviations: EOM: extractable organic matter; THC: total hydrocarbons; nd: not detected (minimum detection limit = 0.002 mg/kg); na: not analyzed.