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. 2021 May 26;9:e11507. doi: 10.7717/peerj.11507

Table 1. The levels of parameters of BBD for extraction experimental.

Parameters Codes Levels
−1 0 1
PSC Ratio of water/M. citrifolia fruit powder (mL/g) X1 70 80 90
Extraction temperature (°C) X2 40 45 50
Extraction time (min) X3 5 10 15
PPN Ratio of water/M. citrifolia fruit powder (mL/g) X′1 70 80 90
Extraction temperature (°C) X′2 85 90 95
Extraction time (min) X′3 5 10 15