<Tr> <Td> C5: 0 </Td> <Td> Valeric acid </Td> <Td> Pentanoic acid </Td> <Td> Valerate </Td> <Td> Pentanoate </Td> <Td> C H O </Td> <Td> CH (CH) COOH </Td> <Td> 102.13 </Td> <Td> </Td> </Tr> <Tr> <Td> C5: 0 </Td> <Td> Isovaleric acid </Td> <Td> 3 - Methylbutanoic acid </Td> <Td> Isovalerate </Td> <Td> 3 - Methylbutanoate </Td> <Td> C H O </Td> <Td> (CH) CHCH COOH </Td> <Td> 102.13 </Td> <Td> </Td> </Tr> <P> Short - chain fatty acids are produced when dietary fiber is fermented in the colon . </P> <P> Short - chain fatty acids and medium - chain fatty acids are primarily absorbed through the portal vein during lipid digestion, while long - chain fatty acids are packed into chylomicrons and enter lymphatic capillaries, and enter the blood first at the subclavian vein . </P>

Where do short chain fatty acids in the colon come from