The chromatographic analysis was carried out in a gas chromatograph
(Agilent GC-6890N) equipped with a split–splitless
injector and an automatic sampler (Agilent 7683B Series) coupled
to a mass selective detector (Agilent MSD-5975N, Agilent, Palo
Alto, CA, USA), according to Soares et al. (2006).