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. 2020 Feb 26;10(1):149–170. doi: 10.1016/j.jcmgh.2020.02.005

Table 2.

BA-Specific Parameters

Parameter Process uCA uCDCA uDCA tCA tCDCA tDCA gCA gCDCA gDCA Dimension Estimation
ksyn Synthesis 27 18 umol/h Taken21,36
ksol Solubilization 0.04 1/h Estimated, pooled data
kconj Conjugation 4.8 4.8 4.8 1/h Taken17
ksecLIV Biliary secretion 12 12 12 12 12 12 1/h Taken15
fdcjIL Scaling factor for tBA and gBA deconjugation 1 1 1 4 4 4 Set based on previous estimations17
kdcjCOL Colonic deconjugation 5 5 5 5 5 5 1/h Selected based on sensitivity analysis
kdhx Dehydroxylation 0.33 0.6285 1/h Estimated, pooled data
kex Fecal excretion 0.07 1/h Calculated from colonic transit time6
kabsUINT UINT absorption 0.09 0.09 1/h Taken15
fabsLINT Scaling factor for LINT absorption 2.5 3 3 2.5 1 1 7.5 1 1 Set based on perfusion studies27
fabsCOL Scaling factor for COL absorption 0.02 0.2 0.13 Set based on perfusion studies28
khupt Hepatic uptake 724 243 190 2016 848 720 2016 848 720 1/h Taken9
fFXR Scaling factor for EC50BAFXR 4 8 5 1.7 1.7 5 1.7 1.7 Set based on in vitro data29

COL, colon; gBA, glycine-conjugated BAs; LINT, lower intestine; tBA, taurine-conjugated BAs; UINT, upper intestine.