First report of antioxidant abeo-labdane type diterpenoid from intertidal red seaweed Gracilaria salicornia with 5-lipoxygenase inhibitory potential

Abstract

Phytochemical investigation on the biologically active compounds of seaweed Gracilaria salicornia {(C. Agardh) E.Y. Dawson} (family Gracilariaceae) guided to the separation of a previously unreported abeo-labdane class of diterpenoid. The compound was characterized as methyl-16(13→14)-abeo-7-labdene-(12-oxo) carboxylate by extensive spectroscopic experiments, and comparison with the related compounds. The studied compound registered significantly greater activities against pro-inflammatory 5-lipoxygenase (IC₅₀ 0.86 mg/mL) than that exhibited by non-steroidal anti-inflammatory agent ibuprofen (IC₅₀ 0.92 mg/mL, P < 0.05). Likewise, this compound exhibited comparable radical quenching (1, 1-diphenyl-2-picryl-hydrazil) activity (IC₅₀ 0.66 mg/mL) as standard antioxidant agent α-tocopherol (IC₅₀ 0.62 mg/mL).

GRAPHICAL ABSTRACT

Keywords:

• Gracilaria salicornia {(C. Agardh) E.Y. Dawson}
• Gracilariaceae
• 16(13→14)-abeo labdane
• anti-inflammatory
• antioxidant

Acknowledgements

The authors thank the Director, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute (ICAR-CMFRI), and Head, Marine Biotechnology Division, ICAR-CMFRI for guidance and support.

Disclosure statement

The authors declare no competing financial interest.

Funding

This work was funded by Science and Engineering Research Board (grant number SR/S1/OC-96A/2012) scheme of the Department of Science and Technology, New Delhi, India.