As external standard, a composed solution of acetic, propionic, butyric and valeric
acid was used.
Changes in the concentrations of straight-chain (acetic, propionic, butyric, valeric
, and hexanoic) and branched chain (isobutyric, isovaleric) VFAs were monitored (Table 2).
These monomers, in the acidogenic phase, are transformed into volatile fatty acids (VFA) such as butyric, valeric
and propionic acids.
From decomposed sewage or wastewater in these cesspits, inorganic acids including hydrogen sulfide or organic acids including acetic acid and valeric
acid may be produced, and these acids accelerate corrosion of concrete.
Source Valproic acid (VPA) 99-66-1 1 2-Ethylhexanoic acid 149-57-5 2 Octanoic acid 124-07-2 3 Valeric
acid 109-52-4 4 2-Methyl butyric acid 623-42-7 5 trans-2-Pentenoic acid 13991-37-2 No.
Samples R-MA-11 to MA-20-R (with the exception of sample MA-R-15), contained valeric
aldehyde and hexyl.
acid has been widely used in perfumes and cosmetics industries due to its pleasant odour.
Also, it has to be mentioned that the valproic acid is a carboxylic acid and a valeric
acid analog, known as an antidepressant and anticonvulsive agent, being used in the treatment of epilepsy, various bipolar disorders or depression.
biofuels: a platform of cellulosic transportation fuels.
In most cases, 3HV production requires the application of structurally related precursor substrates like propionic acid or valeric
acid; these precursors significantly raise the production costs.