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. 2020 Apr 9;15(4):e0231177. doi: 10.1371/journal.pone.0231177

Fig 4. Change of pH due to hydrolysis of triglyceride by mutants of GTL indicated by phenol red.

Fig 4

Wells in red rectangle are positive controls (pH <6, without lipase), in green rectangle are negative controls (pH 9.5, without any lipase) and in blue rectangle are with GTL. Acidic samples are yellow in colour (due to activity of lipase) and alkaline samples are purple in colour.