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

Relação entre composição química de Grateloupia doryphora (Montagne) Howe, Gymnogongrus griffithsiae (Turner) Martius e parâmetros abióticos

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

Relação entre composição química de Grateloupia doryphora (Montagne) Howe, Gymnogongrus griffithsiae (Turner) Martius e parâmetros abióticos

Paulo Nelo Medeiros Perfeto

Departamento de Oceanografia, Universidade do Rio Grande, Caixa Postal 474, CEP 96201-560, Rio Grande, RS, Brasil

ABSTRACT

In Grateloupia doryphora and Gymnogongrus griffithsiae 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 detected during the winter, 28.88% in G. doryphora and 26.68% in G. griffithsiae, corresponding to the maximum period of ammonium concentration in the marine environment. 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. griffithsiae, 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. griffithsiae, 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 11.85%, 0.20%, 1.27% in G. doryphora, and 14.46%, 0.14%, 1.41% in G. griffithsiae.

Key words: algae, proteins, carbohidrates, lipids, ashes, nitrogen, phosphorus, potassium

RESUMO

Foi estudado em Grateloupia doryphora e Gymnogongrus griffithsiae 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. griffithsiae, 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. griffithsiae, 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. griffithsiae, 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. griffithsiae.

Palavras-chave: algas, proteínas, carboidratos, lipídeos, cinzas, nitrogênio, fósforo, potássio

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Acknowledgments

I wish to express sincere appreciation to Dr. José Levy Sabaj, who provided invaluable insight and guidance through of this study. I am also grateful to Dr. Eurico Cabral de Oliveira Filho for valuable suggestions on the first version of the manuscript. My best thank is also due to Dr. João Sarkis Yunes for reading the manuscript, making constructive comments, to Prof. Silvia Fresteiro Barbosa and Prof. Maria Mercedes Solis Rivero by the grammatical correction of the text.

Recebido em 5/5/97

Aceito em 11/3/98

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Publication Dates

• Publication in this collection
  06 June 2011
• Date of issue
  Apr 1998

History

• Received
  05 May 1997
• Accepted
  11 Mar 1998