Carotenes concentration was 1576 mg L−1. These results are similar to those found in studies performed by Silva et al. (2009) where Buriti oil was analysed, presenting 1517 mg L−1 of total tocols and β-tocopherol was the most important homologue. However, it was followed by α-tocopherol and γ-tocopherol respectively, probably due to the different post-harvest treatments of the oil (Silva et al., 2009). Patawa oil presented only α-homologues in both detections: 38.20 and 40.63 mg L−1, VX-770 cell line by PDA and Fluorescence, respectively
of α-tocopherol and 35.17 and 32.84 mg L−1 of α-tocotrienol (Table 5). The α-tocopherol content obtained was similar to that found by Rodrigues et al. (2010), however they did not analyse tocotrienols. The same authors also found β- + γ-tocopherols (7.8 mg L−1) and δ-tocopherol (7.7 mg L−1) in very low concentrations that were not detected in the analyses of Patawa oil done in this work (Table 5). Total tocol content was 73.38 and 73.47 mg L−1, by PDA and Fluorescence, respectively. Carotenes was not detected in Patawa oil. In Patawa chromatogram (Fig. 1D) the interfering peak (retention time approximately 26 min) is higher
than peaks of the tocols. Comparing it with Buriti chromatogram it can be noted that interfering compound has a different retention time of all other analysed compounds, so it do not disturb the analysis. Tucuma oil presented all tocopherol homologues in both Androgen Receptor Antagonist detections. The most important was α-tocopherol (241.05 and 233.60 mg L−1, by PDA and Fluorescence, respectively), followed by γ-tocopherol (68.14 and 64.66 mg L−1), β-tocopherol (37.15 and 39.86 mg L−1) and δ-tocopherol (18.92 and 21.77 mg L−1). The oil also
presented δ-tocotrienol (24.56 and 24.86 mg L−1). Rodrigues et al. (2010) found only α-tocopherol and β- + δ-tocopherols. Total tocol content was 389.82 and 384.75 mg L−1, by PDA and Fluorescence, respectively. Carotenes content was 1934 mg L−1, a result in accordance with those found by Rodriguez-Amaya (1996). Note many that tucuma oil presents higher carotenes content than Buriti oil (Silva et al., 2009). Mean concentration values obtained by PDA and Fluorescence were compared using the Tukey test. There was no significant difference between mean values of each tocopherol/tocotrienol (0.95 confidence level) measured by both detectors. From that, it can be concluded that there is no interfering compound in samples that is detected with tocols and both detectors can be used to quantify tocopherols and tocotrienols in these oils. Although, it can be noted by Table 5 that fluorescence detector has in general lower values of SD, so its use may be preferred. The analytical procedure used by Rodrigues et al. (2010) required several sample preparation steps, including saponification. Besides being time consuming, the sequence of several preparation steps may increase uncertainty of the results. Despite the fact that the samples used in this work and those analysed by Rodrigues et al.
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