Table 7 Penalty points of the proposed CZE-DAD method according to the Analytical Eco-scale in comparison with three previously reported methods
Evaluation Points | The proposed CZE methods | The reported 1st Spectrophotometric method [39] | The reported 2nd Spectrophotometric method [34] | The reported HPLC method [30] |
|---|---|---|---|---|
1—Chemicals |  |  |  |  |
Water | 0 | 0 | – | 0 |
Borate buffer | 1 | – | – | – |
Methanol | – | – | 6 | 6 |
2—Energy | 0 | 0 | 0 | 1 |
3—Occupational hazards | 0 | 0 | 0 | 0 |
4—Waste | 1 | 3 | 3 | 3 |
PPs | 2 | 3 | 9 | 10 |
Eco-scale score | 98 | 97 | 91 | 90 |