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Table 2 Carboxylic acids composition of sunflower oil before and after extractive chain elongation at different pH conditions

From: Reactor microbiome enriches vegetable oil with n-caproate and n-caprylate for potential functionalized feed additive production via extractive lactate-based chain elongation

Compound Initial sunflower oil R1 R2
pH 5.0 (period II-b) pH 7.0 (period III) pH 5.0 (period II-b) pH 7.0 (period III)
Back-extraction estimations
% n-caproic acid (C6:0)a 0 8.20 ± 0.05 0.07 ± 0.07 6.33 ± 0.43 0.08 ± 0.08
% n-caprylic acid (C8:0)a 0 0.27 ± 0.07 0 0.11 ± 0.04 0
wt% MCC   8.22 ± 0.12 0.06 ± 0.06 6.48 ± 0.23 0.08 ± 0.08
nC8-to-nC6 [% mol C] N.A 3.5 ± 0.1 N.A 1.9 ± 0.5 N.A
ISO 15885 standard
% n-caproic acid (C6:0) 0 0.84 ± 0.11 0 0.40 ± 0.03 0
% n-caprylic acid (C8:0) 0 0 0 0 0
% Oleic acid (C18:1, cis 9) 34.85 ± 0.03 34.29 ± 0.1 35.08 ± 0.01 34.58 ± 0.21 35.07 ± 0.11
% Linoleic acid (C18:2, cis 9, 12) 52.92 ± 0.06 52.78 ± 0.22 53.14 ± 0.05 52.95 ± 0.18 53.06 ± 0.08
% Saturated carboxylic acids (SCA) 10.64 ± 0.02 11.34 ± 0.11 10.19 ± 0.02 10.95 ± 0.01 10.28 ± 0.21
% Unsaturated carboxylic acids (UCA) 89.36 ± 0.02 88.66 ± 0.11 89.81 ± 0.02 89.05 ± 0.01 89.72 ± 0.21
% Conjugated linoleic acids (CLA) 0 0 0 0 0
% Ω-3 carboxylic acids 0.14 ± 0.01 0.13 ± 0.01 0.14 ± 0.01 0.13 ± 0.01 0.13 ± 0.01
% Ω-6 carboxylic acids 52.92 ± 0.07 52.78 ± 0.22 53.14 ± 0.05 52.95 ± 0.18 53.06 ± 0.08
% Monounsaturated carboxylic acids (MUCA) 35.74 ± 0.02 35.16 ± 0.10 35.95 ± 0.02 35.43 ± 0.20 35.95 ± 0.12
% Polyunsaturated carboxylic acids (PUCA) 53.06 ± 0.6 52.91 ± 0.21 53.28 ± 0.04 53.08 ± 0.19 53.19 ± 0.08
% Unnamed carboxylic acids 0.56 ± 0.03 0.59 ± 0.01 0.58 ± 0.01 0.54 ± 0.01 0.58 ± 0.01
  1. Values from last two samples of each operational period are averaged
  2. Error represents average absolute deviation from actual values (n = 2)
  3. aAssuming carboxylic acids make 97 wt% of sunflower oil