Doses (mg/L) LA 0 325 650 1300 AA 0 325 650 1300 PA 0 100 200 400 BA 0 75 150 300   Composition (mg/L)   LA AA PA BA Control 0 0 0 0 SSM1 1300 1300 400 300 SSM2 650 1300 400 300 SSM3 325 650 200 150 SSM4 325 325 100 75

Table 2: Doses of single SCFAs and the composition of SCFA mixtures to be tested on Caco-2 and CRL-1831 colon cells.