The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Marie Magnusson - One of the best experts on this subject based on the ideXlab platform.
-
spatial seasonal and within plant variation in total fatty acid content and composition in the brown seaweeds dictyota bartayresii and Dictyopteris australis dictyotales phaeophyceae
Journal of Applied Phycology, 2015Co-Authors: Bjorn J Gosch, Nicholas A Paul, Marie MagnussonAbstract:We investigated the spatial, seasonal, and within-plant variation in total fatty acids (TFA) and fatty acid (FA) composition in the brown seaweeds Dictyota bartayresii sampled from Nelly Bay, Orpheus Island, and Kissing Point (Northern Queensland, Australia) and Dictyopteris australis sampled from Nelly Bay. Both species were present year round, but with no consistent seasonal pattern in plant size, and had an annualized mean content of TFA of 5 % dry weight (dw) that is among the highest recorded for seaweeds. For Dictyota, larger plants had a higher content of TFA and a higher proportion of polyunsaturated omega-3 FA (PUFA(n-3)) than smaller plants, while for Dictyopteris, the TFA content and the proportion of PUFA(n-3) were unrelated to plant size. TFA in Dictyota varied considerably between locations (~40 %) (3.5–5.5 % dw) and to a lesser degree between seasons (~10 %) with a lower content of TFA and higher proportion of PUFA(n-3) in winter. Dictyopteris had an ~10 % higher content of TFA in winter but with no seasonal pattern in the composition of FA. There was also within-plant variation in FA, as TFA decreased from the tips toward the base in both species, and in Dictyopteris, the tips had a higher proportion of saturated FA (SFA) and PUFA(n-3) than the base. The presence of site- and species-specific variation in the content and composition of fatty acids reinforces the need for detailed analyses of the biochemical profile of seaweed biomass, including their extracts or purified compounds, if the focus is nutritional applications based on lipids.
Takamitsu Nagakura - One of the best experts on this subject based on the ideXlab platform.
-
3s 4s 3 butyl 4 vinylcyclopentene in brown algae of the genus Dictyopteris
Phytochemistry, 1997Co-Authors: Tadahiko Kajiwara, Yoshihiko Akakabe, Kenji Matsui, Kazuya Kodama, Harunobu Koga, Takamitsu NagakuraAbstract:Abstract (−)-( 3R,4R )-3-Butyl-4-vinylcyclopentene [(−)- 1 ] was synthesized via (+)-( 1S,5R )-3-oxabicyclo [3,3,0] oct-6-en-2-one. Synthetic (−)- 1 coincided with the peak with later retention time of racemic (±)- 1 in a chiral GC (CP-Cyclodex 236M), while the natural 1 in essential oils from the marine brown algae, Dictyopteris prolifera and D . sp. was identical with the earlier retention time peak. Thus, the absolute configuration of the natural product in Dictyopteris oils was determined as (+)-( 3S,4S ) with ca 100% enantiomeric excess.
-
(+)-(3S,4S)-3-butyl-4-vinylcyclopentene in brown algae of the genus Dictyopteris
Phytochemistry, 1997Co-Authors: Tadahiko Kajiwara, Yoshihiko Akakabe, Kenji Matsui, Kazuya Kodama, Harunobu Koga, Takamitsu NagakuraAbstract:Abstract (−)-( 3R,4R )-3-Butyl-4-vinylcyclopentene [(−)- 1 ] was synthesized via (+)-( 1S,5R )-3-oxabicyclo [3,3,0] oct-6-en-2-one. Synthetic (−)- 1 coincided with the peak with later retention time of racemic (±)- 1 in a chiral GC (CP-Cyclodex 236M), while the natural 1 in essential oils from the marine brown algae, Dictyopteris prolifera and D . sp. was identical with the earlier retention time peak. Thus, the absolute configuration of the natural product in Dictyopteris oils was determined as (+)-( 3S,4S ) with ca 100% enantiomeric excess.
Bjorn J Gosch - One of the best experts on this subject based on the ideXlab platform.
-
spatial seasonal and within plant variation in total fatty acid content and composition in the brown seaweeds dictyota bartayresii and Dictyopteris australis dictyotales phaeophyceae
Journal of Applied Phycology, 2015Co-Authors: Bjorn J Gosch, Nicholas A Paul, Marie MagnussonAbstract:We investigated the spatial, seasonal, and within-plant variation in total fatty acids (TFA) and fatty acid (FA) composition in the brown seaweeds Dictyota bartayresii sampled from Nelly Bay, Orpheus Island, and Kissing Point (Northern Queensland, Australia) and Dictyopteris australis sampled from Nelly Bay. Both species were present year round, but with no consistent seasonal pattern in plant size, and had an annualized mean content of TFA of 5 % dry weight (dw) that is among the highest recorded for seaweeds. For Dictyota, larger plants had a higher content of TFA and a higher proportion of polyunsaturated omega-3 FA (PUFA(n-3)) than smaller plants, while for Dictyopteris, the TFA content and the proportion of PUFA(n-3) were unrelated to plant size. TFA in Dictyota varied considerably between locations (~40 %) (3.5–5.5 % dw) and to a lesser degree between seasons (~10 %) with a lower content of TFA and higher proportion of PUFA(n-3) in winter. Dictyopteris had an ~10 % higher content of TFA in winter but with no seasonal pattern in the composition of FA. There was also within-plant variation in FA, as TFA decreased from the tips toward the base in both species, and in Dictyopteris, the tips had a higher proportion of saturated FA (SFA) and PUFA(n-3) than the base. The presence of site- and species-specific variation in the content and composition of fatty acids reinforces the need for detailed analyses of the biochemical profile of seaweed biomass, including their extracts or purified compounds, if the focus is nutritional applications based on lipids.
Svetlana V Khotimchenko - One of the best experts on this subject based on the ideXlab platform.
-
uncommon 16 1 n 5 acid from dictyota dichotoma and fatty acids of some brown algae of dictyotaceae
Phytochemistry, 1995Co-Authors: Svetlana V KhotimchenkoAbstract:Abstract The detailed fatty acid composition of the brown algae, Dictyota dichotoma, Dictyopteris divaricata and Dictyota cervicornis are reported. About 35 fatty acids were identified, of which 16:0, 18:4 (n-3), 18:1(n-9), 14:0 and 20:4(n-6) predominated in each sample. A high content of an uncommon 16:1(n-5) and the occurrence of C 22 polyunsaturated fatty acids in minute amounts are characteristic features of algae from the genus Dictyota and Dictyopteris divaricata . The structure of 16:1(n-5) was confirmed by GC and mass spectrometry of its derivatives. The distribution of fatty acids among the polar lipids of Dictyota dichotoma are reported. The 16:1(n-5) acid was identified in glycolipids and betaine lipid.
Qin-zhao Xue - One of the best experts on this subject based on the ideXlab platform.
-
A New Epoxy-cadinane Sesquiterpene from the Marine Brown Alga Dictyopteris divaricata
Marine drugs, 2009Co-Authors: Yuan-yuan Qiao, Wei Wen, Xiu-li Yin, Qin-zhao XueAbstract:A new epoxy-cadinane sesquiterpene, 4β,5β-epoxycadinan-1β-ol (1), and six known cadinane sesquiterpenes: cadinan-1,4,5-triol (2), 4α,5β-dihydroxycubenol (3), cubenol (4), cadinan-3-ene-1,5-diol (5), cubenol-3-one (6), and torreyol (7), were isolated from a sample of marine brown alga Dictyopteris divaricata collected off the coast of Yantai (China). Their structures were established by detailed MS and NMR spectroscopic analysis, as well as comparison with literature data.
-
Brominated Selinane Sesquiterpenes from the Marine Brown Alga Dictyopteris divaricata
Marine drugs, 2009Co-Authors: Wei Wen, Qin-zhao Xue, Hua-ling Xiao, Bin-gui WangAbstract:Two new brominated selinane sesquiterpenes, 1-bromoselin-4(14),11-diene (1) and 9-bromoselin-4(14),11-diene (2), one known cadinane sesquiterpene, cadalene (3), and four known selinane sesquiterpenes, α-selinene (4), β-selinene (5), β-dictyopterol (6), and cyperusol C (7), were isolated from a sample of marine brown alga Dictyopteris divaricata collected off the coast of Yantai (China). Their structures were established by detailed MS and NMR spectroscopic analysis, as well as comparison with literature data.