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Table 1 Variables factors considered for T. peruviana oil extraction

From: Brette Pearl Spar Mable (BPSM): a potential recoverable catalyst as a renewable source of biodiesel from Thevetia peruviana seed oil for the benefit of sustainable development in West Africa

Variable

Symbol

Coded factor levels

  

-1

0

+1

Extraction time (min)

X1

40

50

60

Solvent volume (ml)

X2

200

225

250

Sample weight (g)

X3

40

45

50