Journal of Applied Phycology

, Volume 22, Issue 5, pp 623–627 | Cite as

Preparation of galactans from Gracilaria debilis and Gracilaria salicornia (Gracilariales, Rhodophyta) of Indian waters

  • Gaurav K. Mehta
  • Ramavatar Meena
  • Kamalesh Prasad
  • M. Ganesan
  • A. K. Siddhanta


Superior quality non-methylated and low-sulphated galactans were extracted from two Indian agarophytes namely Gracilaria debilis and G. salicornia growing naturally along the west coast of India, using an eco-friendly method developed in our laboratory. The galactans were characterised by FT-IR, 13C NMR, GC-MS, ICP, GPC and rheological measurements. G. debilis produced exclusively non-methylated galactan exhibiting the greatest gel strength of 650±25 g cm−2 and lowest sulphate of 0.21±0.06%. On the contrary, G. salicornia polysaccharide was composed of non-methylated galactose (major) and mannose (minor), having gel strength of 510±25 g cm−2 and sulphate of 0.45±0.06%. Very low heavy metal contents were determined in both the galactan samples, which may thus be potentially useful in food and biological applications.


Gracilaria debilis Gracilaria salicornia Galactans 13C NMR GC-MS 



Grateful thanks are accorded to CSIR, New Delhi, for the award of a fellowship to GKM. The authors thank the Department of Science & Technology, New Delhi, for financial support (DST Sanction No. SR/FT/CS-001/2008).

Supplementary material

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ESMdoc (DOC 323 kb)


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Gaurav K. Mehta
    • 1
  • Ramavatar Meena
    • 1
  • Kamalesh Prasad
    • 1
  • M. Ganesan
    • 1
  • A. K. Siddhanta
    • 1
  1. 1.Marine Biotechnology & Ecology Discipline, Central Salt & Marine Chemical Research InstituteCouncil of Scientific & Industrial Research (CSIR), G.B. MargBhavnagarIndia

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