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Gas production of in vitro fermentation samples. O stands for blank control group. HWE, UE, SWE, and ME stand for dietary fiber extracted with hot water, ultrasonic assisted, subcritical water, and microwave assisted methods, respectively. INU stands for inulin. Different letters a and b indicate significant differences (p < 0.05), the same letters indicate that the differences are not significant (p > 0.05).
