Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2752

Full Length Research Paper

Seasonal variation of the growth, chemical composition and carrageenan extracted from Hypnea musciformis (Wulfen) Lamouroux harvested along the Atlantic coast of Morocco

Mouradi Aziza1 , Thiery Givernaud2 , Meryem Chikhaoui-khay1 and Laila Bennasser1*
1Laboratoire de Biochimie et Biotechnologies marines, Faculté des sciences, B.P. 133, 14 000 Kenitra, Maroc. 2Setexam, B. P 210, 14000-Kénitra, Morocco. 3Faculté des Sciences BP 1014 Rabat Maroc.
Email: [email protected]

  •  Accepted: 24 September 2007
  •  Published: 31 October 2008

Abstract

 

Hypnea musciformis is a common species of the Moroccan Atlantic coast. Both biology and chemical composition of the carrageenan extracted were studied on samples collected monthly during two years on the jetty of Mehdia in the Northwest of the country. The growth of the alga was at its maximum in summer and autumn. Chlorophyll a and R-phycoerythrin (maximum in winter) was the main pigments of the alga. The ash content presented significant fluctuations between 11 to 55% of dry matter. The carrageenan content could reach up to 41% of the dry matter in winter and then decreased in autumn. Its chemical composition did not show marked seasonal variations. Galactose and 3,6-anhydrogalactose were the main components of the carrageenan and varied respectively between 53.79 and 63.79 mole %  for galactose and 31.69 and 41.41 mole % for 3,6-anhydrogalactose. The sulphates oscillated between 15 and 23% of carrageenan dry matter. I.R and NMR13C Spectra showed that the native phycocolloïd extracted from H. musciformiswas formed by the repetition of the disaccharidic unit of kappa carrageenan.

 

Key words: Biology, carrageenans, chemical composition, pigments, Hypnea musciformis, seasonal variation.