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    • Figure 1. 

      Effects of (a) surfactant concentration, (b) temperature, (c) solvent to solid ratio, and (d) extraction time on the extraction yield of total triterpenoids.

    • Figure 2. 

      (a), (c), (e) Response surface diagrams, and (b), (d), (f) the corresponding contour plots of the total triterpenoid yield.

    • Figure 3. 

      The appearance, morphology, and surface pores observed by electron microscopy morphology of chitosan aerogel spheres prepared at the concentration of (a)−(c) 3 wt%, and (d)−(f) 2.5 wt%.

    • Figure 4. 

      (a) Fourier-transform infrared spectroscopy, (b) thermogravimetric curves, and (c) derivative thermogravimetry curves for chitosan aerogel spheres.

    • Figure 5. 

      Growth curves of (a) E. coli, and (b) S. aureus.