液相色谱-串联质谱法测定水稻中生长素及其氨基酸结合物

建立了同时测定水稻中吲哚-3-丁酸(IBA)、吲哚-3-乙酸(IAA)及其7种氨基酸结合物的液相色谱-串联质谱( HPLC - MS/MS)检测方法.样品在4℃下于80％甲醇中浸提12 h后,经混合阴离子交换反相固相萃取(MAX)净化,以5 mmol/L的甲酸铵溶液和甲醇为流动相,在C18柱上进行液相色谱分离,电喷雾正...

Analysis of Auxins and Their Amino Acid Conjugates in Rice by Liquid Chromatography Tandem Mass Spectrometry

A liquid chromatography-tandem mass spectrometric(LC-MS/MS) method was developed for the simultaneous determination of indole-3-butyric acid(IBA),indole-3-acetic acid(IAA) and its 7 amino acid conjugates including IAA-Asp,IAA-Ala,IAA-Val,IAA-Trp,IAA-Leu,IAA-Ile and IAA-Phe in rice.The sample was extracted with 80% methanol for 12 h at 4 ℃.The extract was cleaned up on an Oasis MAX cartridge(60 mg×3 mL),and eluted with methanol contained 0.5% formic acid.9 analytes were separated on a C18 column(1.8 μm,100 mm×2.1 mm i.d.) using 5 mmol/L ammonium formate(A)-acetonitrile(B) as mobile phase by gradient elution.The analytes were detected by positive-ion electrospray ionization-mass spectrometry under multiple reaction monitoring(MRM) mode.The recoveries of 9 analytes from the matrixes of root,sheath,leaf and seed in rice tissue ranged from 75% to 106% with relative standard deviations(RSDs) of 3.6%-15.2%.The detection limits(S/N=3) ranged from 0.01 μg/kg to 25 μg/kg.The method was sensitive and reliable,and could meet the requirements for quantification of auxins and their amino acid conjugates in rice at the physiological level.