scholarly journals Effects of secondary metabolites from the tropical Brazilian brown alga Dictyota menstrualis on the amphipod Parhyale hawaiensis

2000 ◽  
Vol 205 ◽  
pp. 95-100 ◽  
Author(s):  
RC Pereira ◽  
DN Cavalcanti ◽  
VL Teixeira
Keyword(s):  
Secondary Metabolites ◽  
Brown Alga ◽  
Dictyota Menstrualis ◽  
Parhyale Hawaiensis

scholarly journals Effects of storage and solvent type in a lipophylic chemical profile of the seaweed Dictyota menstrualis

2008 ◽  
Vol 56 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Diana Negrão Cavalcanti ◽  
Marcelo Augusto Vasconcelos Gomes ◽  
Angelo Cunha Pinto ◽  
Claudia Moraes de Rezende ◽  
Renato Crespo Pereira ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Chemical Analysis ◽  
Bioactive Compounds ◽  
Mass Production ◽  
Brown Seaweed ◽  
Selective Extraction ◽  
Chemical Profile ◽  
Dictyota Menstrualis ◽  
Crude Extracts ◽  
Solvent Type

Crude extracts from specimens of the brown seaweed Dictyota menstrualis, known to produce diterpenes as their major secondary metabolites, were analyzed according to storage procedures before extraction, and the solvent types used to obtain the crude extracts. The specimens of D. menstrualis were submitted to three types of storage procedures, such as wet, dry, and frozen and were extracted with a mixture of dichloromethane:methanol (2:1) and acetone. Qualitative differences were not observed by GC/MS analyses of all crude extracts containing mainly the diterpenes pachydictyol A (I), 6-hydroxy-dichotoma-3,14-diene-1,17-dial (II), 6-hydroxy-2,7-cycloxenia-3,14-diene-1,17-dial (III), and 6-acetoxy-dichotoma-3,14-diene-1,17-dial (IV). The most efficient and selective extraction of the compounds with intermediate polarity produced by D. menstrualis was obtained using acetone, but with less mass production. In general, the storage procedures produced very similar results, but the frozen samples furnished low amount of total diterpenes. According to these results on chemical analysis of crude extracts of seaweeds, the choice of solvent to extraction should be considered as important aspect to better screening bioactive compounds.

Slightly polar secondary metabolites from the far-eastern brown alga Dictyota dichotoma

2007 ◽  
Vol 43 (6) ◽  
pp. 751-752
Author(s):  
S. A. Kolesnikova ◽  
A. I. Kalinovskii ◽  
V. A. Stonik
Keyword(s):  
Secondary Metabolites ◽  
Brown Alga ◽  
Dictyota Dichotoma ◽  
Far Eastern

scholarly journals Chemotaxis and chemical defenses in seaweed susceptibility to herbivory

2000 ◽  
Vol 60 (3) ◽  
pp. 405-414 ◽  
Author(s):  
R. C. PEREIRA ◽  
R. DONATO ◽  
V. L. TEIXEIRA ◽  
D. N. CAVALCANTI
Keyword(s):  
Chemical Defense ◽  
Brown Alga ◽  
Sea Urchins ◽  
Feeding Preference ◽  
Chemical Defenses ◽  
Feeding Deterrent ◽  
Limited Mobility ◽  
Dictyota Menstrualis ◽  
Close Relationship ◽  
Herbivore Species

Recent studies have show that small marine herbivores with limited mobility (mesograzers) often feed on macroalgae chemically defended against fishes or sea-urchins. In order to verify the involved mechanisms of chemotaxis or chemical defense into this process in Brazilian littoral, two species of brown alga Dictyota menstrualis and Dictyota mertensii were studied against the limited mobility herbivores, the amphipod Parhyale hawaiensis and the crab Pachygrapsus transversus. These two species were studied in order to verify the action of their crude extracts in the defense and chemotaxis processes related to limited mobility of these herbivores. Feeding preference assays revealed that P. hawaiensis do not eaten these Dictyota species. P. transversus do not eaten D. menstrualis either, but consumed large amounts of D. mertensii. Chemical deterrence assays showed that extracts of these species act as feeding deterrent to both species of herbivores. In addition, chemotaxis assays demonstrated that both herbivores are significantly negative chemotactic probably due to the presence of complementary metabolites into artificial foods. Considering that both Dictyota species exhibit active extracts against these small herbivores, we suppose that the non-occurrence of these herbivore species in close relationship with the seaweeds D. menstrualis and D. mertensii may explain the defense action of both extracts related to these mesograzers.

New Spatane-Derived Diterpenoids From the Australian Brown Alga Dictyota fenestrata

1992 ◽  
Vol 45 (3) ◽  
pp. 541 ◽  
Author(s):  
IA Vanaltena ◽  
J Mcgivern
Keyword(s):  
Secondary Metabolites ◽  
Brown Alga

The secondary metabolites of the brown alga Dictyota fenestrata were investigated. It was shown that two of the major metabolites were the previously unknown acetylated spatane (1) and the secospatane (5). Their structures were determined by spectroscopic and chemical means.

scholarly journals Inhibitory Effects against Pasture Weeds in Brazilian Amazonia of Natural Products from the Marine Brown Alga Dictyota menstrualis

2013 ◽  
Vol 8 (12) ◽  
pp. 1934578X1300801
Author(s):  
Rainiomar Raimundo Fonseca ◽  
Antonio Pedro Silva Souza Filho ◽  
Roberto Campos Villaça ◽  
Valéria Laneuville Teixeira
Keyword(s):  
Brown Alga ◽  
Acetone Extract ◽  
Sulfated Polysaccharides ◽  
Mimosa Pudica ◽  
Inhibitory Effects ◽  
Water Fraction ◽  
Dictyota Menstrualis ◽  
The One ◽  
Tlc Analysis ◽  
Marine Brown Alga

Fractions of the acetone extract and a mixture of two diterpenes from the marine brown alga Dictyota menstrualis were prepared with the aim of identifying potential effects on the germination of seeds and on elongation of the radicle and hypocotyl of the weeds Mimosa pudica and Senna obtusifolia. The bioassay on seed germination was performed in controlled conditions of 25°C temperature and a 12 hour photoperiod, while the one concerning radicle and hypocotyl elongation was performed at the same temperature, though adopting a photoperiod of 24 hours. The results varied according to the receptor species, the fraction utilized, and its concentration. TLC analysis of the fractions and comparison with isolated products indicated that the diterpenes pachydictyol A and isopachydictyol A were the most abundant compounds in fraction HE, whereas the diterpene 6-hydroxy-dichotomano-2, 13-diene-16, 17-dial (3) was the most abundant compound in fractions DC and EA. Analysis of less polar fractions (in n-hexane, dichloromethane and ethyl acetate) revealed values of less than 30% inhibition. On the other hand, the ethanol/water fraction was the most active in all instances. The biological activity of these fractions must be due to the presence of known diterpenes and/or sulfated polysaccharides isolated in earlier studies.

Variability of a diterpene with potential anti-HIV activity isolated from the Brazilian brown alga Dictyota menstrualis

2010 ◽  
Vol 23 (5) ◽  
pp. 873-876 ◽  
Author(s):  
Diana Negrão Cavalcanti ◽  
Meire-Anne Rezende de Oliveira ◽  
Joel Campos De-Paula ◽  
Leandro Silva Barbosa ◽  
Tamara Fogel ◽  
...  
Keyword(s):  
Brown Alga ◽  
Dictyota Menstrualis ◽  
Anti Hiv

scholarly journals Chemical Variation in the Diterpenes from the Brazilian Brown Alga Dictyota Menstrualis (Dictyotaceae, Phaeophyceae)

2008 ◽  
Vol 3 (11) ◽  
pp. 1934578X0800301 ◽  
Author(s):  
Fredy Augusto Ortiz-Ramírez ◽  
Diana Negrão Cavalcanti ◽  
Roberto Campos Villaça ◽  
Joel Campos de Paula ◽  
Yocie Yoneshigue-Valentin ◽  
...  
Keyword(s):  
Brown Alga ◽  
Rio De Janeiro ◽  
Sao Paulo ◽  
São Paulo ◽  
Chemical Variation ◽  
Dictyota Menstrualis ◽  
Geographic Patterns

All the chemical HRGC/MS profiles of samples of Dictyota menstrualis, collected in Buzios, Rio de Janeiro and São Pedro and São Paulo Archipelago, Brazil, presented diterpenes as major constituents. The samples contained either prenylated guaiane or xeniane derivatives as their major diterpenes. However, there was a variation concerning the quantity of these components. Taking this into consideration, it is possible to establish typical geographic patterns.

scholarly journals HPLC-NMR Chemical Profiling and Dereplication Studies of the Marine Brown Alga, Cystophora torulosa

2013 ◽  
Vol 8 (6) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Sylvia Urban ◽  
Michael Timmers
Keyword(s):  
Mass Spectrometry ◽  
Secondary Metabolites ◽  
Secondary Metabolite ◽  
Brown Alga ◽  
Nmr Assignment ◽  
2D Nmr ◽  
Chemical Profiling ◽  
Line Identification ◽  
On Line ◽  
Marine Brown Alga

A chemical profiling/dereplication exercise, involving the use of HPLC-NMR and mass spectrometry in combination with the MarinLit database, was conducted on the crude dichloromethane extract of the southern Australian marine brown alga Cystophora torulosa. This strategy was successful in identifying a total of nine secondary metabolites representing two principle structure classes, including seven resorcinol (1–7) and two polyene derivatives (8 and 9). Validation of this on-line dereplication strategy was supported by the isolation and complete 2D NMR assignment of the major secondary metabolite (1). This methodology was concluded to be suitable for the rapid on-line identification of the resorcinol and polyene structure classes that are frequently encountered in the genus Cystophora.

scholarly journals Effects of the secondary metabolites from Canistrocarpus cervicornis (Dictyotales, Phaeophyceae) on fertilization and early development of the sea urchin Lytechinus variegatus

2017 ◽  
Vol 41 (2) ◽  
pp. 296-304
Author(s):  
Fredy A. Ortiz-Ramírez ◽  
Magui Aparecida Vallim ◽  
Diana Negrão Cavalcanti ◽  
Valéria Laneuville Teixeira
Keyword(s):  
Natural Products ◽  
Secondary Metabolites ◽  
Early Development ◽  
Sea Urchin ◽  
Brown Alga ◽  
Marine Organisms ◽  
Lytechinus Variegatus ◽  
Male And Female ◽  
Canistrocarpus Cervicornis ◽  
Marine Brown Alga

Marine organisms are rich sources of natural products that, among other activities, help to maintain the species equilibrium. Samples of the marine brown alga Canistrocarpus cervicornis (Kützing) De Paula & De Clerck were collected in Búzios, Rio de Janeiro, Brazil, in June 2006. The extract was obtained in CH2Cl2 and subjected to fractionation by chromatographic methods in order to isolate and purify the compound (4R, 7R, 14S)-4α, 7α-diacethoxy-14-hydroxydolastane-1(15), 8-dien. Then, the effects of the extract and the dolastane diterpene on zygotes and gametes of the sea urchin Lytechinus variegatus were evaluated. The exposure of male and female gametes to the C. cervicornis extract promoted, respectively, a reduction of 10-30% in fertilization and a 20 to 70% decrease in the number of eggs. Furthermore, the exposure of zygotes to the extract inhibited their development up to 86.7 ± 1.6% (at a concentration of 250 µg mL-1), as well as generating abnormalities in 39-50% of zygotes. The results of the dolastane diterpene showed no evidence of inhibition in the zygotes’ development, thought it was proved to induce anomalies. At higher concentrations (25 and 50 µg mL-1), it was possible to observe cell lyses.

scholarly journals Diterpenoid Constituents from the Brown Alga Dictyota Menstrualis (Dictyotaceae, Phaeophyta)

2006 ◽  
Vol 1 (8) ◽  
pp. 1934578X0600100 ◽  
Author(s):  
Diana N. Cavalcanti ◽  
Claudia M. Rezende ◽  
Angelo C. Pinto ◽  
Valéria L. Teixeira
Keyword(s):  
Brown Alga ◽  
Acetone Extract ◽  
Dictyota Menstrualis

The acetone extract of the Brazilian brown alga Dictyota menstrualis (Hoyt) Schnetter, Hörnig & Weber-Peukert was analyzed by HRGC-MS. Eight diterpenoids were identified: pachydictyol A (1), isopachydictyol A (2), dictyol C (3), dictyotadiol (4), dictyoxide (5), 9-hydroxy- and 9-acetoxy-dichotoma-2, 13-diene-16,17-dial (6–7) and 5-hydroxy-1, 6-cycloxenia-2,13-diene-16,17-dial (8). This technique may be an excellent alternative for chemotaxonomic and biogeographic studies.

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