Fig. 3From: Quantification of karrikins in smoke water using ultra-high performance liquid chromatography–tandem mass spectrometryStability of karrikin standards in McIlvaine buffer, pH 5.0. Solutions of KAR1 (black squares) and KAR2 (white diamonds) standards (10−5 M) were incubated for 12 days (short-time treatment; a, b) and 12 weeks (long-time treatment; c, d), at two temperatures: + 22 °C (a, c) and + 4 °C (b, d). Values are mean ± SD (n = 3)Back to article page