Fig. 1From: Development of isotope dilution-liquid chromatography tandem mass spectrometry for the accurate determination of vitamin K1 in spinach and kimchi cabbageSRM chromatograms of a vitamin K1 in spinach, b vitamin K1 in kimchi cabbage, and c vitamin K1-d7. The SRM transitions were m/z 452 → 187 for vitamin K1 and m/z 459 → 194 for vitamin K1-d7Back to article page