Abstract
We analysed the haemagglutinating activity of algal extracts from 44 species of freshwater microalgae against native and trypsin/papain-treated cow, pig, sheep, and human A-, B-, and O-type erythrocytes. Algal extracts obtained with aqueous ethanol exhibited higher haemagglutinating activity than those obtained with aqueous acetone. Most of the algal extracts agglutinated at least one of the erythrocyte types analysed. Human erythrocytes were the most sensitive of the cell types analysed. In the other species, the sensitivity of algal haemagglutinating activity for erythrocytes was pig > sheep > cow. Pre-treating erythrocytes with trypsin and papain improved the detection of most algal agglutinins and increased the haemagglutination titre; pre-treatment with papain was most effective for pig erythrocytes. Algal extracts stored at −20 °C for 4 months lost their haemagglutinating activity. Algal extracts also exhibited strong antibiotic activity against food pathogenic bacteria, especially against Bacillus. Our numerical taxonomy data showed that these microalgae might be grouped into several clusters according to their haemagglutinating activity. The detection of haemagglutinating activity may provide an efficient biochemical or physiological character to classify and differentiate microalgae. Our results suggest that freshwater microalgae might provide a potent source of haemagglutinins and antibacterial compounds for biochemical and medical studies and applications.
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Chu, C., Liao, W., Huang, R. et al. Haemagglutinating and antibiotic activities of freshwater microalgae. World Journal of Microbiology and Biotechnology 20, 817–825 (2004). https://doi.org/10.1007/s11274-004-8712-6
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DOI: https://doi.org/10.1007/s11274-004-8712-6