Fig. 2From: Method development for the quantitative determination of short chain fatty acids in microbial samples by solid phase extraction and gas chromatography with flame ionization detectionComparison of chromatograms of the eluent through SPE cartridge for the spiking control sample with SCFA standard (50 μg/mL) (a) DB-WAX, (b) Nukol™ column. Peak identities were as follows: (1) acetic acid, (2) propionic acid, (3) pivalic acid (IS), (4) butyric acid, (5) valeric acidBack to article page