Multivariate Optimization of Ultrasound-Assisted Extraction of Phenolic Compounds from Apples.

For TPC, the quadratic model was highly significant (F = 32.20, p = 0.0007; Table 2 ), indicating that the model adequately describes the relationship between extraction variables and phenolic recovery.

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Effect of BBD Independent Variables on TFC For TFC, temperature ( p < 0.0001) and SSR ( p < 0.0001) were identified as highly significant linear variables, whereas citric acid concentration (X 1 ) did not show a statistically significant effect at the 95% confidence level ( p = 0.0888), although a slight trend was observed ( Table 2 ).

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