A5029135377- Natural product bioactivities and synthesis
- Phytochemical Studies and Bioactivities
- Polysaccharides and Plant Cell Walls
- Carbohydrate Chemistry and Synthesis
- Phytochemistry and Biological Activities
- Phytochemistry and Bioactive Compounds
- Glycosylation and Glycoproteins Research
- Polysaccharides Composition and Applications
- Toxin Mechanisms and Immunotoxins
- Plant biochemistry and biosynthesis
- Traditional and Medicinal Uses of Annonaceae
- Microbial Metabolites in Food Biotechnology
- Research on Leishmaniasis Studies
- Essential Oils and Antimicrobial Activity
- Antioxidant Activity and Oxidative Stress
- Marine Sponges and Natural Products
- Ginseng Biological Effects and Applications
- Bioactive natural compounds
- Piperaceae Chemical and Biological Studies
- Analytical Chemistry and Chromatography
- Garlic and Onion Studies
- Botany, Ecology, and Taxonomy Studies
- Bioactive Compounds and Antitumor Agents
- Phytochemical compounds biological activities
- Biochemical and Structural Characterization
Universidade Federal do Rio de Janeiro
2009-2022
World Bank
1999
Universidade Federal do Ceará
1987
Laboratoire de Chimie
1982-1986
Centre National de la Recherche Scientifique
1982-1985
École Nationale Supérieure de Chimie de Lille
1982-1985
Utrecht University
1982-1983
A new steroidal saponin was isolated from the bulbs of Allium ampeloprasum var. porrumL. On basis chemical evidence, comprehensive spectroscopic analyses and comparison known compounds, its structure established as (3β,5α,6β,25R)-6-[(β-D-glucopyranosyl)oxy]-spirostan-3-yl O-β-D-glucopyranosyl-(1→2)-O-[β-D-glucopyranosyl-(1→3)]-β-D-galactopyranoside. Results present study indicated that showed haemolytic effects in vitro assays demonstrated antiinflammatory activity gastroprotective property...
From the aqueous extract of Alpinia zerumbet (Pers) B. L. Burttet Smith. (= speciosa K. Schum.) flavonoids and kava pyrones were obtained. The identified as rutin (1), kaempferol-3-O-rutinoside (2), kaempferol-3-O-glucuronide (3), (+)-catechin (4) (−)-epicatechin (5) are well known substances that can contribute to hypotensive, diuretic antiulcerogenic activity plant, while dihydro-5,6-dehydrokawain (6) 5,6-dehydrokawain (7) have been described antithrombotic. compounds from their UV, 1H-...
Hen ovomucoid is characterized by a high degree of microheterogeneity its carbohydrate moieties, as was recently demonstrated hydrazinolysis in combination with performance liquid chromatography (Paz Parente, J., Strecker, G., Leroy, Y., Montreuil, and Fournet, B. (1982) J
The apparently homogenous N ‐glycosidically‐linked glycans 1, 7, 11 and 14 released by hydrazinolysis from hen ovomucoid were analysed fast atom bombardment electron‐impact mass spectrometry after reduction permethylation. spectra support the primary structures established independently [FEBS Letters (1983) 152, 145–152] using methylation analysis, partial acid hydrolysis 500 MHz 1 H NMR spectroscopy. In addition to major constituents present in fractions 14, four minor components not...
This structure is a novel member of the family N ‐glycosidic carbohydrates glycoproteins.
A new steroidal saponin was isolated from the leaves of Agave attenuata Salm-Dyck. Its structure established as (3beta,5beta,22alpha,25S)-26-(beta-D-glucopyranosyloxy)-22-methoxyfurostan-3-yl O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosyl-(1-->2)-O-[beta-D-glucopyranosyl-(1-->3)]-beta-D-glucopyranosyl-(1-->4)-beta-D-galactopyranoside. The structural identification performed using detailed analyses 1H and 13C NMR spectra including 2D spectroscopic techniques (COSY, HETCOR COLOC)...
Descreve-se o aproveitamento do resíduo desfibramento das folhas de Agave sisalana, como um larvicida para combate a mosquitos transmissores doenças tropicais. Durante 24 horas, larvas Aedes aegypti e Culex quinquefasciatus foram expostas concentrações diferentes extrato da planta determinar as letais. Para A. foi constatada CL50 em 322ppm C. 183ppm. Foi investigada ação saponinas existentes na planta, ficando evidenciado que sisalana é ativo através interação vários dos seus componentes....
Abstract A new steroidal saponin was isolated from the leaves of Sansevieria cylindrica . Its structure established as (3β,12β,15α,25 S )‐26‐(β‐ D ‐glucopyranosyloxy)‐22‐hydroxyfurost‐5‐en‐3‐yl 12‐ O ‐ (6‐deoxy‐α‐ L ‐mannopyranosyl)‐15‐ ‐(6‐deoxy‐α‐ ‐mannopyranosyl)‐β‐ ‐glucopyranoside. The structural identification performed using detailed analyses 1 H and 13 C NMR spectra including 2D spectroscopic techniques (COSY, HETCOR, HMBC HMQC) chemical conversions. showed no haemolytic effects in...
Abstract A new steroidal saponin was isolated from the bulbs of Allium ampeloprasum L. var. porrum. On basis chemical evidence, comprehensive spectroscopic analyses, and comparison with known compounds, its structure established as (3 β ,5 α ,6 ,25 R )‐3‐{( O ‐ D ‐glucopyranosyl‐(1→3)‐ ‐glucopyranosyl‐(1→2)‐ ‐[ ‐glucopyranosyl‐(1→3)]‐ ‐glucopyranosyl‐(1→4)‐ ‐galactopyranosyl)oxy}‐6‐hydroxyspirostan‐2‐one ( 1 ). Results present study indicated that exhibited haemolytic activity in vitro...
Alkaline borohydride reductive cleavage (beta-elimination) of glycophorin A isolated from one individual the rare blood group Cad, resulted in release six acidic oligosaccharide-alditols which were separated by high-performance liquid chromatography (HPLC) on an alkyl amine silicagel column. The structure four them has been determined application methanolysis, methylation analysis and 1H-NMR spectroscopy at 500 MHz. structures relative amounts as follows: oligosaccharide 1: NeuAc(alpha...