Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode

Table 1

Summary of concentration of caffeine in aqueous coffee extract and corresponding amount of caffeine per gram of roasted coffee of coffee samples from different localities of Ethiopia.

Locality of coffee sample	DPV oxidative peak current (μA)	Caffeine concentration (μA)	Caffeine
Wonbera	1.45	44.41	10.78
Wolega	1.17	36.18	8.78
Finoteselam	0.83	26.18	6.35
Zegie	0.76	24.12	5.85

Caffeine content per gram mass of powdered coffee sample.