Lookup the document at:. Obihiro Univ. Takahashi, Y. Sagisaka, K. High sensitive phenol-sulfuric acid colorimetric method. Takeuchi, K. Dubois et al.
High sensitive phenol-sulfuric acid colorimetric method 
Colorimetric Method for Determination of Sugars and Related Substances | Analytical Chemistry
Biotechnology Letters. Two planktonic cyanobacteria, Anabaena sp. N and Anabaena sp. PC-1, and a green eukaryotic alga, Scene-desmus sp. The flocculant of Anabaena PC-1, when purified, was found to be a macromolecular polysaccharide consisting of neutral sugars, uronic acids, and proteins, but not keto acids, hexosamines nor fatty acids. The flocculant bound a cationic dye, Alcian Blue, indicating it to be polyanionic.
High sensitive phenol-sulfuric acid colorimetric method