Tea polysaccharides (TPS) are natural polysaccharides with significant physiological activities. Chemically selenized tea polysaccharides (CSe-TPS) exhibit higher concentration of selenium (Se) and physiological activity compared to naturally selenized tea polysaccharides (NSe-TPS). However, limited research has explored their digestion and fermentation properties. Three kinds of CSe-TPS are prepared, which are hot water-assisted chemical selenization of tea polysaccharides (HCSe-TPS), ultrasound-assisted chemical selenization of tea polysaccha...