Optimisation of ultrasound-assisted extraction of phenolic antioxidants from <i>Ilex guayusa</i> Loes. leaves using response surface methodology.

Heliyon · 2020 · PMC6939111 · PMID 31909247

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highly significantno p-value reported

Fisher's F test value was 65.23, considered very high, and a low P < 0.0001, which showed that the model was highly significant.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.