Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina
Seasonal variation of agar from specimens of a commercially exploited population of Gracilaria gracilis (Stackhouse) Steentoft, Irvine & Farnham in the Patagonian coast of Argentina was studied. For each seasonal harvest, random samples of plants were pooled for subsequent polysaccharide ext...
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2013
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13220829_v61_n3_p163_Martin http://hdl.handle.net/20.500.12110/paper_13220829_v61_n3_p163_Martin |
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paper:paper_13220829_v61_n3_p163_Martin2023-06-08T16:10:23Z Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina Rodriguez, María Cecilia Matulewicz, María Cristina Fissore, Eliana Noemí Gerschenson, Lía Noemí Agar Gracilaria gracilis Rheological behavior Seasonal variation agar algal culture biochemical composition biotechnology commercial species harvesting marine technology physicochemical property red alga seasonal variation spore Argentina Atlantic Ocean Patagonian Shelf algae Bacteria (microorganisms) Gracilaria Gracilaria gracilis Gracilariales Rhodophyta Seasonal variation of agar from specimens of a commercially exploited population of Gracilaria gracilis (Stackhouse) Steentoft, Irvine & Farnham in the Patagonian coast of Argentina was studied. For each seasonal harvest, random samples of plants were pooled for subsequent polysaccharide extraction at different water temperatures and agar physico-chemical properties and composition were determined. Both spring and summer plants yielded 30% and 41% of agar, respectively, which differed slightly in their at rest rheological behavior. Spring and summer plants produced strong gels (238 and 218gcm-2, respectively), but the latter gels had nil adhesiveness. In autumn plants, agar yield decayed to 19%, though the product still maintained similar gel strength (210gcm-2). Adhesiveness in this product was at least an order of magnitude higher than in the others, concomitant with a peak in the formation of tetraspores and carpospores. This suggests a biological role for the galactan in the initial attachment of spores to the substrate. But since fall corresponds to the settling of reproductive structures, caution should be taken to harvest the algae once spores have been shed from mother plants. © 2013 Japanese Society of Phycology. Fil:Rodríguez, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Matulewicz, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fissore, E.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gerschenson, L.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13220829_v61_n3_p163_Martin http://hdl.handle.net/20.500.12110/paper_13220829_v61_n3_p163_Martin |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Agar Gracilaria gracilis Rheological behavior Seasonal variation agar algal culture biochemical composition biotechnology commercial species harvesting marine technology physicochemical property red alga seasonal variation spore Argentina Atlantic Ocean Patagonian Shelf algae Bacteria (microorganisms) Gracilaria Gracilaria gracilis Gracilariales Rhodophyta |
| spellingShingle |
Agar Gracilaria gracilis Rheological behavior Seasonal variation agar algal culture biochemical composition biotechnology commercial species harvesting marine technology physicochemical property red alga seasonal variation spore Argentina Atlantic Ocean Patagonian Shelf algae Bacteria (microorganisms) Gracilaria Gracilaria gracilis Gracilariales Rhodophyta Rodriguez, María Cecilia Matulewicz, María Cristina Fissore, Eliana Noemí Gerschenson, Lía Noemí Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina |
| topic_facet |
Agar Gracilaria gracilis Rheological behavior Seasonal variation agar algal culture biochemical composition biotechnology commercial species harvesting marine technology physicochemical property red alga seasonal variation spore Argentina Atlantic Ocean Patagonian Shelf algae Bacteria (microorganisms) Gracilaria Gracilaria gracilis Gracilariales Rhodophyta |
| description |
Seasonal variation of agar from specimens of a commercially exploited population of Gracilaria gracilis (Stackhouse) Steentoft, Irvine & Farnham in the Patagonian coast of Argentina was studied. For each seasonal harvest, random samples of plants were pooled for subsequent polysaccharide extraction at different water temperatures and agar physico-chemical properties and composition were determined. Both spring and summer plants yielded 30% and 41% of agar, respectively, which differed slightly in their at rest rheological behavior. Spring and summer plants produced strong gels (238 and 218gcm-2, respectively), but the latter gels had nil adhesiveness. In autumn plants, agar yield decayed to 19%, though the product still maintained similar gel strength (210gcm-2). Adhesiveness in this product was at least an order of magnitude higher than in the others, concomitant with a peak in the formation of tetraspores and carpospores. This suggests a biological role for the galactan in the initial attachment of spores to the substrate. But since fall corresponds to the settling of reproductive structures, caution should be taken to harvest the algae once spores have been shed from mother plants. © 2013 Japanese Society of Phycology. |
| author |
Rodriguez, María Cecilia Matulewicz, María Cristina Fissore, Eliana Noemí Gerschenson, Lía Noemí |
| author_facet |
Rodriguez, María Cecilia Matulewicz, María Cristina Fissore, Eliana Noemí Gerschenson, Lía Noemí |
| author_sort |
Rodriguez, María Cecilia |
| title |
Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina |
| title_short |
Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina |
| title_full |
Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina |
| title_fullStr |
Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina |
| title_full_unstemmed |
Seasonal variation in agar composition and properties from Gracilaria gracilis (Gracilariales, Rhodophyta) of the Patagonian coast of Argentina |
| title_sort |
seasonal variation in agar composition and properties from gracilaria gracilis (gracilariales, rhodophyta) of the patagonian coast of argentina |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13220829_v61_n3_p163_Martin http://hdl.handle.net/20.500.12110/paper_13220829_v61_n3_p163_Martin |
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