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Volumn 17, Issue 3, 2007, Pages 636-639

Natural dibenzoxazepinones from leaves of Carex distachya: Structural elucidation and radical scavenging activity

Author keywords

Carex distachya; Dibenzoxazepinones; Radical scavenging activity; Spectroscopic analysis

Indexed keywords

1,1 DIPHENYL 2 PICRYLHYDRAZYL; DIBENZOXAZEPINE DERIVATIVE; HERBACEOUS AGENT; NITRIC OXIDE; SUPEROXIDE;

EID: 33846242210     PISSN: 0960894X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.bmcl.2006.11.002     Document Type: Article
Times cited : (30)

References (16)
  • 7
    • 33846231752 scopus 로고    scopus 로고
    • note
    • 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.
  • 8
    • 33846242498 scopus 로고    scopus 로고
    • note
    • 2O (2:2:1) to give pure 2 (3 mg).
  • 9
    • 33846259685 scopus 로고    scopus 로고
    • note
    • 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.
  • 10
    • 33846203279 scopus 로고    scopus 로고
    • note
    • 3OD): Table 1.
  • 11
    • 58149364663 scopus 로고    scopus 로고
    • note
    • 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.
  • 12
    • 3042698412 scopus 로고    scopus 로고
    • note
    • 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.
  • 13
    • 0034882481 scopus 로고    scopus 로고
    • note
    • 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.
  • 16
    • 33846241640 scopus 로고    scopus 로고
    • Peters, J.-U.; Goodnow R. A., Jr.; Galley, G. U.S. Patent WO 01/98282 WO Dec., 2001.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.