Igarapé do Quarenta (IgQ), a stream located in the Manaus-AM, BR, has directly experienced the impacts of urban expansion over the last five decades, which contributed for its contamination. As an affluent of Rio Negro, IgQ also affects the water quality of this important river that bathes Manaus. However, the stress caused by the prolonged exposition to chemical agents may have selected microorganisms that exhibit great bioremediation potential. In the present study, bacteria isolated from four distinct sites of the IgQ were identified, and their potential to degrade hexavalent chromium (Cr(VI)) was investigated using the s-diphenylcarbazide method. Among the investigated isolates, 14 exhibited resistance against Cr(VI) at a concentration of 300 mg/L and eight isolates reduced over 50% (53.5–97.4%) chromium ratios after 72 h of incubation. Those isolates were identified by gene sequencing and classified in 10 genera (Acidovorax sp., Acinetobacter sp., Alicycliphilus sp., Bacillus sp., Comamonas sp., Enterobacter sp., Micrococcus sp., Proteus sp., Serratia sp., and Vagococcus sp.). Under control conditions, the isolate of Vagococcus sp. genus, in only 24 h of incubation, reduced 96.8% of the rate of Cr(VI) added to the culture medium at the concentration of 10 mg/L. Obtained results indicate that the Vagococcus sp. exhibits a great potential to be used in the bioremediation of areas contaminated with chromium. The mechanisms of action of microorganisms should be investigated for more specific applications in the decontamination of effluents and direct use of its by-products to bioremediate polluted environments.Electronic supplementary materialThe online version of this article (10.1007/s11270-018-3903-1) contains supplementary material, which is available to authorized users.

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This study reported for the first time the chemical profile of the petiole of Victoria amazonica (Poepp.) J.C. Sowerby, a non-conventional edible plant (NCEP), and demonstrated its nutritional and functional potential. Its proximate composition was determined by verifying the fiber, lipid, protein, ash, and carbohydrate contents in fresh samples. V. amazonica petiole has a high moisture content (97.62%), while has low amounts of protein, crude fiber and carbohydrates (3.10%, 1.81%, and 5.78%, respectively). At 19.5 kcal g− 1, this NCEP can be classified as a low-calorie food, especially due to low lipid content of 1.47%. Amongst the extracts and solvent-partitioned fractions, the ethyl acetate fraction showed the highest total phenolic content (25.47 GAE mg 100 g− 1) and antioxidant potential (IC50: 13.67 µg mL− 1), which were evaluated using the Folin-Ciocalteu and DPPH methods, respectively. In comparison with well-known conventional fruits and plants, based on results obtained for the methanolic extract, the petiole showed a low total phenolic content (13.61 GAE mg 100 g− 1) and also an antioxidant potential (IC50: 50.12 µg mL− 1) that was 10-fold higher than the gallic acid reference standard. Five phenolic acids were identified by dereplication using liquid chromatography coupled to mass spectrometry (LC-DAD-ESI-Q-TOF-MS). Gallic, ferulic, p-coumaric and 3,4-dihydroxybenzoic acids, as well the flavonoid quercetin-3-O-rhamnoside, were identified in methanolic extract. As a low-carb and low-fat food, this unconventional edible plant can be incorporated into diets with dietary restrictions and can be classified as a functional food since it is a source of bioactive compounds.

This study reported for the rst time the chemical pro le of the petiole of Victoria amazonica (Poepp.) J.C. Sowerby, a non-conventional edible plant (NCEP), and demonstrated its nutritional and functional potential. Its proximate composition was determined by verifying the ber, lipid, protein, ash, and carbohydrate contents in fresh samples. V. amazonica petiole has a high moisture content (97.62%), while has low amounts of protein, crude ber and carbohydrates (3.10%, 1.81%, and 5.78%, respectively).At 19.5 kcal g − 1 , this NCEP can be classi ed as a low-calorie food, especially due to low lipid content of 1.47%. Amongst the extracts and solvent-partitioned fractions, the ethyl acetate fraction showed the highest total phenolic content (25.47 GAE mg 100 g − 1 ) and antioxidant potential (IC 50 : 13.67 µg mL − 1 ), which were evaluated using the Folin-Ciocalteu and DPPH methods, respectively. In comparison with wellknown conventional fruits and plants, based on results obtained for the methanolic extract, the petiole showed a low total phenolic content (13.61 GAE mg 100 g − 1 ) and also an antioxidant potential (IC 50 : 50.12 µg mL − 1 ) that was 10-fold higher than the gallic acid reference standard. Five phenolic acids were identi ed by dereplication using liquid chromatography coupled to mass spectrometry (LC-DAD-ESI-Q-TOF-MS). Gallic, ferulic, p-coumaric and 3,4-dihydroxybenzoic acids, as well the avonoid quercetin-3-Orhamnoside, were identi ed in methanolic extract. As a low-carb and low-fat food, this unconventional edible plant can be incorporated into diets with dietary restrictions and can be classi ed as a functional food since it is a source of bioactive compounds.