To improve the extraction rate of soluble dietary fiber (SDF) from moso bamboo leaves, the extraction rates, structural and functional characteristics of soluble dietary fiber from bamboo leaves extracted by hot water extraction method, steam explosion method, sodium hexametaphosphate extraction method, and steam explosion-assisted sodium hexametaphosphate extraction method were compared and analyzed.Results showed that the extraction efficiency of the steam explosion-assisted sodium hexametaphosphate extraction method was the highest (51.15%), followed by the sodium hexametaphosphate method, steam explosion method, and hot water extraction method.The structure and composition of SDF were different between the steam explosion and the sodium hexametaphosphate explosion.The SDF with the combined method had the most complex structure, the smallest particle size and the highest absolute value of zeta-potential, which were 434.90 nm and -20.37 mV, respectively.The SDF extracted by the combined method had better functional properties and glucose adsorption capacity, cholesterol adsorption capacity, and ·OH radical scavenging capacity were the best, which were (52.04±0.19)%, (57.14±0.73)% (pH=2), (62.53±5.31)% (pH=7), and (95.50±1.46)%, respectively.The results provide a theoretical basis and data support for the extraction and application of soluble dietary fiber from moso bamboo leaves.
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