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Table 1 Regression equations of phenolic acid standard samples using external standard method

From: Physiological and transcriptomic analyses to reveal underlying phenolic acid action in consecutive monoculture problem of Polygonatum odoratum

Phenolic acid standard sample Regression equation R2 Retention time (min)
p-hydroxybenzoic acid y = 19.394x + 0.5019 0.999 15.42
Vanillic acid y = 19.040x + 0.0441 0.999 19.29
Syringic acid y = 29.678x - 0.0005 0.999 21.84
Cumaric acid y = 42.687x + 0.3221 0.999 27.16
Ferulic acid y = 27.663x - 0.0114 0.999 28.94