Bark characterization of Tachigali guianensis and Tachigali glauca from the Amazon under a valorization perspective

Barks of Tachigali guianensis and glauca, from the Brazilian Amazon rainforest, were studied regarding anatomy chemical composition. The barks similar, with a narrow rhytidome, ring sclerified cells below periderm, widely dilated nonconducting phloem, septate crystal strands, extensive phenolic deposits in cells. Differences between species mainly sclerenchyma. Proportions cell types T. glauca were, respectively: 27.8% 28.3% axial parenchyma, 15.6% 15.1% sieve tube elements, 11.6% 13.4% radial 8.7% sclereids, 30.5% 34.5% fibers. Chemical analysis showed that included, 18.0% 15.3% extractives, 1.8% 1.0% suberin, 26.8% 27.9% lignin, 3.5% 4.5% ash. predominant polysaccharides glucose (72.8% 82.8% total neutral sugars) xylose (17.9% 11.6%). Ethanol-water extracts high phenolics (total 441.0 mg gallic acid equivalents (GAE) / g extract 641.7 GAE extract), moderate antioxidant activities (IC50 values 7.3 µg mL 5.6 mL). bark and, particularly, may be sources compounds.