Table 2 First-order degradation rate constants for (±)-tramadol in aqueous solution exposed to UV irradiation
From: Photostability studies on (±)-tramadol in a liquid formulation
UV-A lamp | UV-B lamp | UV-C lamp | |||||
|---|---|---|---|---|---|---|---|
( n ) | k (h −1 ) | r | k (h −1 ) | r | k (h −1 ) | r | |
(+)-tramadol | (5) | 1.00 × 10−3 | −0.237 | 4.50 × 10−3 | −0.881 | 6.20 × 10−3 | −0.953 |
(−)-tramadol | (5) | 0.40 × 10−3 | −0.127 | 3.70 × 10−3 | −0.921 | 7.10 × 10−3 | −0.970 |