Research Article
Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode
Table 2
Summary of percentage recoveries of spiked standard caffeine in aqueous coffee extract.
| | Sample | Initial
μM | Spiked standard (μM) | Expected,
μM | % recovery |
| | Coffee extract (a) | 26.31 | — | — | — | | Coffee extract (b) | 26.31 | 5.43 | 5.45 | 99.63 | | Coffee extract (c) | 26.31 | 8.00 | 7.83 | 102.17 | | Coffee extract (d) | 26.31 | 12.99 | 13.85 | 93.79 | | Coffee extract (e) | 26.31 | 15.33 | 15.56 | 98.52 |
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