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7
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33846231752
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note
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Plants of Carex distachya Desf. (Cyperaceae) were collected in June 2004 in Castel Volturno, near Caserta (Campania, Italy), and identified by Dr. Assunta Esposito of the Department of Scienze della Vita of Second University of Naples (SUN). A voucher specimen (CE278) has been deposited at the herbarium of the Dipartimento di Scienze della Vita of SUN.
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8
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33846242498
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2O (2:2:1) to give pure 2 (3 mg).
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9
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33846259685
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note
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13C on a Varian Mercury 300 spectrometer Fourier transform NMR. Electronic impact mass spectra (EI-MS) were obtained with an HP 6890 instrument equipped with a MS 5973 N detector. HR mass spectra were obtained with a ESI-MS Waters 2690-ZMD instrument.
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10
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33846203279
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note
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3OD): Table 1.
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11
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58149364663
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note
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Brand-Williams, W.; Cuvelier, M. E.; Berset, C. Lebensm.-Wiss. Technol. 1995, 28, 25. The method is based on the reduction of methanolic DPPH in the presence of a hydrogen-donating antioxidant. DPPH radical solution showed an absorption band at 517 nm and was intensely violet colored. The DPPH radical (2 mg) was dissolved in 54 ml MeOH. The investigated metabolites were prepared by dissolving 0.1 mg of each compound in 1 ml MeOH. Then, 38 μl of each solution containing compound was added to 1.462 ml DPPH radical solution at room temperature. The absorbance at 517 nm was measured in a cuvette at 30 min versus blank (38 μl MeOH in 1.462 ml DPPH radical solution) using a UV-1601 Shimadzu spectrophotometer. The results are expressed in terms of the percentage reduction of the initial DPPH radical adsorption by the test compounds.
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12
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3042698412
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note
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Nabasree, D.; Bratati, D. Food Chemistry, 2004, 88, 219. The assay of superoxide radical scavenging activity was based on the capacity of the isolated metabolite (0.1 mg/ml) to inhibit the photochemical reduction of nitroblue tetrazolium (NBT) in the riboflavin-light-NBT system. Each 3 ml reaction mixture contained 50 mM sodium phosphate buffer (pH 7.8), 13 mM methionine, 2 μM riboflavin, 100 μM EDTA, 75 μM NBT, and 100 μl sample solution. The production was followed by monitoring the increase in absorbance at 560 nm after 10-min illumination from a fluorescent lamp.
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13
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0034882481
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note
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4). The absorbance of the chromophore formed during the diazotination of nitrite with sulfanilamide and subsequent coupling with naphthylethylen-diamine was read at 540 nm and referred to the absorbance of standard solution of sodium nitrite treated in the same way with Griess reagent.
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16
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33846241640
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Peters, J.-U.; Goodnow R. A., Jr.; Galley, G. U.S. Patent WO 01/98282 WO Dec., 2001.
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