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. 2019 Dec 4;19(12):1474–1489. doi: 10.1089/ast.2018.1963

Table 1.

Concentration (μg·g−1) and Compositional Distribution of Lipid Biomarkers and Bulk Stable Isotopes in the Dallol Samples

  D6 D7 D8 D10 D11
TOC (% dw) 0.12 0.35 0.15 0.22 0.14
δ13COC (‰) −23.2 −25.9 −22.6 −24.3 −22.9
δ34S total (‰) 8.2 15.3 18.4 10.9 20.5
δ34S SO4 (‰) 6.5 8.5 9.5 7.3 11.7
n-alkanes 0.08 0.42 0.12 0.25 0.17
branched n-alkanesa 0.05 0.25 0.09 0.16 0.12
ACL n-alkanesb 19 20 19 20 20
LMWn-alkanes/HMWn-alkanesc 3.10 1.62 2.46 1.82 1.53
CPI n-alkanes (c14–C27)d 0.86 1.05 0.98 0.98 1.01
pristanee 0.05 0.10 0.06 0.07 n.d.
phytanef n.d. 0.07 0.03 0.02 n.d.
n-carboxylic acids 0.85 1.77 0.78 0.88 0.68
unsaturated carboxylic acidsg 0.12 0.15 0.12 0.13 0.10
dicarboxylic acids 0.02 0.02 0.01 0.01 0.01
iso/anteiso-carboxylic acidsh 0.01 0.05 0.02 0.02 0.01
MM-carboxylic acidsi n.d. 0.02 0.01 0.03 0.01
Σ carboxylic acidsj 1.01 2.01 0.93 1.07 0.82
ACL n-carboxylic acidsb 18 19 17 17 18
LMWn-acids/HMWn-acidsc 3.12 2.36 63.67 6.40 3.07
CPI n-carboxylic acids (c8–C28)d 7.40 4.34 28.85 3.68 5.74
n-alkanols 0.35 0.83 0.56 0.68 0.42
ACL n-alkanolsb 21 20 20 20 20
LMWn-alkanols/HMWn-alkanolsc 0.70 0.98 0.92 0.98 0.98
CPI n-alkanols (c11–C28)d 6.71 4.38 3.45 4.29 8.25
cholesterolk 0.01 0.02 0.01 0.03 0.01
stigmastanoll 0.22 0.35 0.13 0.15 0.11
β-sitosterolm 0.02 0.03 0.02 0.01 0.01
Σ c32+C34 wax ester n.d. 0.04 0.01 0.03 n.d.
a

Sum of mono-, di-, trimethyl n-alkanes.

b

Average chain length of C14–C27 n-alkanes; C8–C28 n-carboxylic acids and C11–C28 n-alkanols. ACLi-n = Σ(i·Xi + … + n·Xn)/ΣXi + … + Xn), where X is concentration (van Dongen et al., 2008).

c

Low molecular weight (LMW) over high molecular weight (HMW). LMW is the sum of C14–C20 (n-alkanes), C8–C20 (n-carboxylic acids), and C11–C20 (n-alkanols). HMW is the sum of C21–C27 (n-alkanes), C21–C28 (n-carboxylic acids), and C21–C28 (n-alkanols).

d

Carbon preference index, CPIi-n = ½Σ(Xi + Xi+2 + … + Xn)/Σ(Xi−1 + Xi+1 + … + Xn−1) + ½Σ(Xi + Xi+2 + … + Xn)/Σ(Xi+1 + Xi+3 + … + Xn+1), where X is concentration.

e

2,6,10,14-tetramethyl-pentadecane.

f

2,6,10,14-tetramethyl-hexadecane.

g

Sum of monounsaturated n-carboxylic acids (C16 and C18).

h

Sum of iso- and anteiso- n-carboxylic acids (C14–C18).

i

Sum of monomethyl C22 and C24 n-carboxylic acids.

j

Sum of all carboxylic acids (saturated, unsaturated, dicarboxylic, iso/anteiso- and monomethyl-).

k

Cholest-5-en-3b-ol.

l

24-ethyl-5a-cholest-22-en-3b-ol.

m

4-Ethylcholest-5-en-3β-ol.

n.d. = not detected.