Phenolic compound

Linear range (ppm)

Linear equation

R coefficient

R² coefficient

LOD (ppm)

LOQ (ppm)

Caffeic acid

0.10 - 20

y = 258.156x + 198.750

0.993

0.985

2.732

9.106

Ferulic acid

0.10 - 20

y = 211.196x + 70.825

0.993

0.987

1.730

5.766

Sinapic acid

0.10 - 20

y = 123.085x + 74.989

0.994

0.989

3.705

12.352

p-coumaric acid

0.10 - 20

y = 130.054x + 100.156

0.992

0.983

3.617

12.056

Chlorogenic acid

0.10 - 20

y = 274.309x ? 44.400

0.999

0.999

0.459

1.529

Gallic acid

0.10 - 20

y = 121.185x + 72.692

0.994

0.988

2.261

7.538

Vanillic acid

0.10 - 20

y = 97.610x + 36.396

0.995

0.989

1.278

4.260

Ellagic acid

0.10 - 20

y = 32.644x + 22.078

0.995

0.990

1.736

5.787

p-hydroxybenzoic acid

0.10 - 20

y = 50.425x + 31.859

0.997

0.995

1.264

4.214

Protocatechuic acid

0.10 - 20

y = 92.879x + 70.475

0.993

0.987

2.412

8.038

Pyrogallic acid

0.10 - 20

y = 104.227x + 51.756

0.995

0.991

2.616

8.721

3,5-dimethoxybenzoic acid

0.10 - 20

y = 120.380x + 56.541

0.994

0.990

1.477

4.922

Quercetin

0.10 - 20

y = 993.424x + 551.770

0.994

0.988

1.343

4.476

Naringenin

0.10 - 20

y = 1440.661x + 754.607

0.992

0.984

1.253

4.177