Optimization of eco-friendly ultrasonic probe-assisted extraction from <i>Stevia rebaudiana</i> Bertoni using response surface methodology and antioxidant evaluation.

As seen in Figure 2A, 2D, and 2F , the effect of ultrasonic frequency was found to be marginally significant ( F = 5.74; p = 0.0300).

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While extraction time is shown in Figure 4A, 4C, and 4D depicted a positive trend in the graphical analysis, it was not found to be statistically significant ( p > 0.05), though other studies have observed such effects [ 49 ].

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