Relation between chemical composition of Grateloupia doryphora (Montagne) Howe, Gymnogongrus griffithsiae (Turner) Martius, and abiotic parameters

Abstract

Recebido em 5/5/97. Aceito em 1113/98 RESUMO -(Relação entre composição química de Grate/oL/pia doryphora (Montagne) Howe, GymnogongrL/s grijfithsiae (Turner) Martius e parâmetros abióticos). Foi estudado em Grate/oL/pia doryphora e Gyll1nogongrL/s grijfithsiae a variação sazonal de seus compostos químicos, estabelecendo uma relação com os parâmetros físico-químicos da água do mar. Durante o inverno foram detectados valores altos de proteína nas espécies estudadas, com 28 ,88 % em G. doryphora e 26,68 % em G. grijfithsiae, correspondendo ao período de concentração máxima de amônio no ambiente marinho. A variação no conteúdo de carboidratos apresentou relação inversa à de proteínas. Os valores máximos de 54,72 % em G. doryphora e de 55,36 % em G. grijfithsiae, ocorreram no verão, correlacionados positivamente com salinidade e temperatura da água do mar. Os conteúdos de lipídeos foram baixos em ambas as espécies. Em G. doryphora os valores variaram entre 0,81 e 1,30 % e em G. grijfithsiae, de 0,71 a 1,50 % do peso seco, mostrando relação direta com a quantidade de nitrogênio na água do mar. O conteúdo máximo de cinzas, fósforo e potássio ocorreu no outono e inverno, respectivamente com 11,85 %, 0,20 % e 1,27 % em G. doryphora e 14,46 %, 0,14 % e 1,41 % em G. grijfithsiae.Palavras-chave: algas, proteínas, carboidratos, lipídeos, cinzas, nitrogênio, fósforo, potássio ABSTRACT -(Relation between chemical composition 01' Grate/oL/pia doryphora (Montagne) Howe, Gyl11nogongrL/s grijfithsiae (Turner) Martius, and abiotic parameters). In Grate/oL/pia doryphora and Gyll1nogongrL/s grijfithsiae the seasonal variation of their chemical compounds was studied, establishing a relation with the physical and chemical properties of seawater. High values of proteins in the studied species were delecled during the winler, 28.88% in G. doryphora and 26.68% in G. grijfithsiae, corresponding to the maximum period of ammonium concentration in the marineenvironment. The variation in carbohydrates content showed an inverse relation with the proteins, with a maximum of 54.72% in G. doryphora and of 55.36% in G. grijfithsiae, both in summer, positively correlated with salinity and temperature of sea water. Lipids content was low in both species. In G. doryphora the values ranged between 0.81 and 1.30% and, in G. grijfithsiae, from 0.71 to 1.50% of dry weight, showing a direct relation with the amount of nitrogen in the seawater. The maximum content of ashes, phosphorus and potassium occurred in autumn and winter, respectively, with I 1.85%,0.20%, 1.27% in G. doryphora , and 14.46%,0.14%, 1.41 % in G. griffithsiae.

Seasonal variation in the biochemical composition of red seaweed (Catenella repens) from Gangetic delta, northeast coast of India

“…The values were highest in premonsoon and lowest in post-monsoon indicating the role of surface water temperature to be vital for photosynthesis. The positive influence of water temperature, salinity and pH on carbohydrate synthesis was confirmed by several workers (Munda and Kremer 1977;Perfeto 1998). Significant positive correlation between salinity and surface water temperature and carbohydrate values in our study also supports the above results (table 3).…”

Biogas production from algal biomass: A review

“…The highest ash content value was found in winter and early spring in conjunction with a reduction of carbohydrate synthesis. The opposite behaviour was observed during summer ( [17][18][19][20]74]). Therefore, it was concluded that the ash fraction is inversely correlated to the carbohydrates level [17].…”

Gross Chemical Profile and Calculation of Nitrogen-to-Protein Conversion Factors for Five Tropical Seaweeds

“…Despite this, several authors continue to use the factor 6.25 to estimate seaweed protein content (e.g. [30][31][32][33]). …”