Figure 7.

Relative, average amperometric current response of skin covered oxygen electrode (SCOE) immersed in citrate buffer saline (CBS) (pH 5.5) upon the addition of CA in different forms. Arrow #1 marks the addition of H₂O₂ (0.5 mM; n = 19), arrow #2 marks the addition of Sol-CA (CA 0.5 mM, black triangles, n = 3); ETHO-CA (CA 0.5 mM, blue closed circles, n = 6), unloaded ETHO (blue open circles, n = 4), SLN-CA (CA 0.5 mM, red closed squares, n = 3), and unloaded SLN (red open squares, n = 3). Time scale is adjusted by assigning t = 0 min to the moment when the formulations have been introduced to the measurement cell. The relative response is calculated, assigning a baseline current of the SCOE in CBS to zero and the current response to 0.5 mM H₂O₂ equal to 1.