As emphasized by Sampaio, Ceriani, Silva, Taham, and Meirelles (2010), crop seasonality and fruit ripeness are responsible for fluctuations in the composition of vegetable see more oils. We have developed a simple, sensitive and reproducible HPLC method for simultaneously quantification of tocols and total carotenes. The lower limit of quantification (LOQ) was 5.0 mg L−1 for the tocols and 0.1 mg L−1 for carotenes, inasmuch the lower limit of detection (LOD) was 2.50 mg L−1 for tocols and 0.05 mg L−1 for carotenes. There was no significant solvent evaporation
during samples storage in autosampler, allowing the solubilisation of a large number of oil samples for each analytical run. The methodology was applied for the quantification of these compounds in Amazon oils, concluding that both PDA and Fluorescence can Ion Channel Ligand Library purchase be used to quantify tocopherols and tocotrienols in these vegetable oils. R. Ceriani and A.J.A. Meirelles acknowledge FAPESP (2008/56258-8; 2010/16634-0) and CNPq (306250/2007-1; 301999/2010-4) for the financial support. K.A. Sampaio and S.M. Silva acknowledge CNPq (140283/2009-9) and CAPES (0099-11-2) for scholarships. “
“Fructans, otherwise known as fructooligosaccharides,
are important as storage components in many plant species, including several Asteraceae, Liliaceae and Poaceae, which are of great importance as forage grass cereals. The most common sources are underground organs of chicory, Jerusalem artichoke, asparagus, and members of the onion family (Wack & Blaschek, 2006). They contain (2→1)- and/or (2→6)-linked β-d-fructofuranosyl units with one internal or external glucosyl
unit (Waterhouse & Chatterton, 1993). Some non-digestible fructans, namely those containing (2→1)-linkages, such as inulin and inulin-like oligosaccharides (Fig. 1), confer potentially interesting prebiotic properties in human and pet foods, and non-food applications (Fuchs, 1991). Although there is a growing interest Urease in fructans and fructan-producing species, there is little information on their biological proprieties. Some studies have shown the role of fructooligosaccharides (FOS) in defence functions (Buddington et al., 2002 and Letellier et al., 2000), lipid metabolism (Delzenne, Daubioul, Neyrinck, Lasa, & Taper, 2002), control of diabetes (Luo et al., 2000), and anti-cancer activity (Pool-Zobel, Loo, Rowland, & Roberfroid, 2002). Stevia rebaudiana (Bert.) Bertoni belongs to the family Asteraceae and contains, in substantial quantities, several highly potent low-calorie sweeteners in its leaves ( Brandle, 1998). The commercial exploitation of this plant has increased since the 1970’s, when Japanese researchers developed a process for extraction and refinement of its components ( Dacome et al., 2005).