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. 2021 May 12;6(20):13057–13065. doi: 10.1021/acsomega.1c00685

Table 1. Experimental Ranges and Levels of the ECH Dosages of the First (X1) and Second Cross-Linking (X3) and Imprinting pH (X2).

  range and level
independent variables low (−1) center (0) high (+1)
first cross-linking ECH, % (X1) 0.10 0.55 1.00
imprinting pH (X2) 1.0 1.7 2.4
second cross-linking ECH, % (X3) 0.10 0.55 1.00