The objective of the present study was to investigate the adsorption behaviours by use of activated carbon (AC) for the removal of benzoic acid (BA),
valeric acid (VA), butyric acid (BUA) and propionic acid (PA) from aqueous solutions by changing their initial concentration.
Although common SCFAs include formic, acetic, propionic, butyric, isobutyric,
valeric, isovaleric, and caproic acids [22], 90-95% of the SCFAs present in the colon are constituted by acetate, propionate, and butyrate [8], with intraluminal concentrations of about 60% acetate (C2), 25% propionate (C3), and 15% butyrate (C4) [23].
4,4,-Bis(4-hydroxyphenyl)
valeric acid and 4-fluoro benzoic acid were purchased from Sigma-Aldrich and used as received.
Chemicals Acrylic acid (Aldrich, Germany), N-vinyl-2pyrrolidone (Fluka), tetrahydrofuran (Riedel-de Haen), ethyl acetate (Fluka) and 4,4'-azobis(4-cyano
valeric acid) (Fluka) were of analytical grade reagents.
Giuseppina Ciulla (a),
Valeric. Lo Brano (a), Antonio Messineo (b), Giorgia Peri (a)
Samples collected in deionized water were sent to an outside laboratory for analysis by liquid chromatography (LC) for organic acids formic, pyruvic, DL-lactic, acetic, propionic, butyric, isovaleric, and
valeric. The amount of a compound leaving the dryer is determined from a ratio of the gas flow through the impingers to the total gas flow leaving the dryer.
The SCFA (acetic, propionic, isobutyric, butyric, isovaleric,
valeric, and caproic acids) and one MCFA (medium chain fatty acid, heptanoic acid) in the intestinal content (caecum, proximal and distal colon) were analysed using a GLC method [34].
Contact:
Valeric Barron, Valerie.Barron@nuigal way.ie
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Among them were alkanes, 4 phenyl
valeric acid, 5 isopentyl picolinic acid, 3 hydroxylauric acid, (5 a, 3[beta]) 3-hydroxy-11-androstanone, 5[alpha]-2-en-11 androstenone, squalene, terpinol (a terpineol), menthol derivatives, palmitic, oleic and eicosanoic acids, and isoprenoid phytane.
The complexes of acetovaleric acid hydrazone [AVAH], acetylaldehyde
valeric acid hydrazone [AAVAH], acetyl isovaleric acid hydrazone [AIVA] and acety aldehyde varaleric acid hydrazone [AAIVAH] complexes with Cu(II) and Ni(II) sulphate have been reported to be of distorted octahedral symmetry with a promising antibacterial activity (4).