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Table 3 Linear regression equation of phlorizin, astragalin and afzelin (Additional file 1: Table S1–S3)

From: Dynamic changes of secondary metabolites and tyrosinase activity of Malus pumila flowers

Compound

Regression equation

r

Linear range (μg)

Phlorizin

Y = 643736X + 158998

0.9987

0.4080–14.28

Astragalin

Y = 518051X + 145776

0.9979

0.3920–13.72

Afzelin

Y = 835408X − 359973

0.9942

0.3980–13.93