Effect of extraction procedures on the chemical structure, antitumor and anticoagulant properties of ulvan from Ulva lactuca of Tunisia coast

Carbohydr Polym. 2021 Feb 1:253:117283. doi: 10.1016/j.carbpol.2020.117283. Epub 2020 Oct 23.

Abstract

The effect of extraction procedures on chemical composition, structural, antitumor and anticoagulant properties of the sulphated polysaccharide 'ulvan' from the green seaweed Ulva lactuca were investigated. The structural features of ulvans were carried out by FTIR and by one- and two- dimensional 1H and 13C NMR spectroscopic. The ulvans were mainly composed of rhamnose, xylose, and uronic acid. Chemical and spectroscopic analyses demonstrated that ulvans were constituted of (1→4)-β-glucuronic acid, (1→3,4)-α-L-rhamnose-3-sulphate and (1→4)-α-xylose. The extraction procedures effect were observed in chemical structure, Mw and biological activities. Cytotoxic activity of enzymatic-chemical extract on cervical cancer cells (HeLa) (IC50 = 1000 μg/mL) was higher than on normal peripheral blood lymphocytes cells (PBL). Acid extracts promoted to reduce HeLa cells and to grow PBL cells. At high concentrations, acid extracts showed the highest APTT and TT clotting time. Antitumoral and anticoagulant activities of ulvans from Ulva lactuca promote their use as effective therapeutic agent.

Keywords: Anticoagulant activity; Cytotoxic activity; Extraction procedures; FTIR; NMR; Ulvans.

MeSH terms

  • Anticoagulants / chemistry*
  • Anticoagulants / isolation & purification
  • Anticoagulants / pharmacology*
  • Antineoplastic Agents / chemistry*
  • Antineoplastic Agents / isolation & purification
  • Antineoplastic Agents / pharmacology*
  • Blood Donors
  • Carbon-13 Magnetic Resonance Spectroscopy
  • Cell Proliferation / drug effects
  • Cell Survival / drug effects
  • HeLa Cells
  • Humans
  • Leukocytes, Mononuclear / drug effects
  • Partial Thromboplastin Time
  • Plant Extracts / chemistry*
  • Plant Extracts / isolation & purification
  • Plant Extracts / pharmacology*
  • Polysaccharides / chemistry*
  • Polysaccharides / isolation & purification
  • Polysaccharides / pharmacology*
  • Seaweed / chemistry
  • Spectroscopy, Fourier Transform Infrared
  • Thrombin Time
  • Tunisia
  • Ulva / chemistry*

Substances

  • Anticoagulants
  • Antineoplastic Agents
  • Plant Extracts
  • Polysaccharides
  • ulvan