Study on removal of coloured impurity in soybean oligosaccharides extracted from sweet slurry by adsorption resins

► The first study applying resin in decolourisation of soybean oligosaccharides. ► The first study showing adsorption resins performed best in decolourisation. ► The adsorption process agreed with the Freundlich isotherm model. ► Decolourisation process was a chemical mechanism which was the rate-controlling step.