Table 3.

Standard curve test and polyphenols constituents of lemon peel (n = 3).

Component	Regression equation	Determination coefficient (R2)	Content (mg/g)
Protocatechic acid	y = 0.063x−0.5747	0.9883	20.625 ± 0.452
Caffeic acid	y = 0.0474x−0.4885	0.9889	102.795 ± 1.371
Neochlorogenic acid	y = 0.0312x−0.7432	0.9838	25.575 ± 0.553
(+)-Catechin	y = 0.0285x−0.2828	0.9875	50.82 ± 0.479
Gallic acid	y = 0.1034x−1.0159	0.9854	17.49 ± 0.226
(−)-Catechin gallate	y = 0.0467x−0.5053	0.9854	110.715 ± 1.105
Isochlorogenic acid A	y = 0.0244x−0.6093	0.9250	69.96 ± 1.007
Rosmarinic acid	y = 0.0386x−0.5622	0.9848	255.915 ± 1.821