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Table 3 Quadratic polynomial equations for the three responses in terms of coded factors

From: Effects of temperature, time, and solvent ratio on the extraction of phenolic compounds and the anti-radical activity of Clinacanthus nutans Lindau leaves by response surface methodology

Responses

Equations

Extraction yield

\(Y = 20.33 - 0.95A - 1.08B - 0.35C - 3.33AB - 1.68AC - 0.80BC + 0.082A^{2} - 1.36B^{2} + 0.75C^{2}\)

(3)

DPPH radical scavenging activity

\(Y = 74.41 - 8.49A - 5.43B - 1.52C - 5.32AB - 1.72AC - 3.08BC - 5.01A^{2} - 1.17B^{2} - 0.80C^{2}\)

(4)

TPC

\(Y = 118.39 - 4.24A + 0.84B - 1.30C - 4.69AB - 2.17AC + 6.11BC - 5.13A^{2} - 0.0027B^{2} - 0.46C^{2}\)

(5)

  1. In these equations, Y is the predicted response, A, B and C are the values of the independent variables, extraction temperature (°C), extraction time (min) and solvent ratio (water: ethanol) (v/v%), respectively