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  Indian J Med Microbiol
 

Figure 1: Response surface for the ultrasound assisted extraction (a ,b and c ) of caffeic acid (Ca) from A. tibourbou (CaY % = 0.027−0.014. X2+0.003. X3+0.007. X22 [Eq. 1])

Figure 1: Response surface for the ultrasound assisted extraction (a ,b and c ) of caffeic acid (Ca) from A. tibourbou (CaY % = 0.027−0.014. X2+0.003. X3+0.007. X<sub>2<sub><sup>2</sup> [Eq. 1])