Application of response surface methodology and quantitative NMR for the optimum extraction, characterization, and quantitation of Antrodia cinnamomea triterpenoids

Figures

Figure 1

The ergostane epimers and lanostane…

Figure 1

The ergostane epimers and lanostane triterpenoids.

Figure 1 The ergostane epimers and lanostane triterpenoids.

Figure 2

Plot and comparison of 1…

Figure 2

Plot and comparison of 1 H NMR profiles of EEAC, zhankuic acid A,…

Figure 2 Plot and comparison of 1H NMR profiles of EEAC, zhankuic acid A, and dehydroeburicoic acid (400 MHz).

Figure 3

The three-dimensional response surface profiles…

Figure 3

The three-dimensional response surface profiles of the integration area ratios of EEAC total…

Figure 3 The three-dimensional response surface profiles of the integration area ratios of EEAC total ergostane and lanostane triterpenoids affected by three independent variables.

Figure 4

The prediction profile of the…

Figure 4

The prediction profile of the optimized extraction conditions of each factor utilizing the…

Figure 4 The prediction profile of the optimized extraction conditions of each factor utilizing the central composite design.