液相色谱串联质谱法测定豆芽中2种植物生长调节剂
来源:用户上传
作者:崔敏
摘 要:目的:建立了豆芽中4-氯苯氧乙酸(4-CPA)和6-苄基腺嘌呤(6-BAP)的液相色谱-质谱联用仪的测定方法。方法:豆芽样品经酸化乙腈提取,LC-C18柱净化后,以甲醇和含5 mmol/L乙酸铵的0.1%甲酸的流动相,经C18色谱柱分离,在UPLC-MS/MS的多反应监测模式下进行定性定量分析。结果:在10~200 ng/mL,
2种植物生长调节剂有良好线性关系(R2≥99.7%),回收率为84.3%~94.6%,精密度为2.6%~10.3%,4-CPA的检出限和定量限分别为1.54 ?g/kg和4.28 ?g/kg,6-BAP的检出限和定量限分别为0.237 ?g/kg和0.459 ?g/kg。结论:该方法前处理简单快速、线性良好,回收率和精密度高,可以准确测定豆芽中4-CPA和6-BAP的含量,满足国内外豆芽中对4-CPA和6-BAP限量的检测需求。
关键词:豆芽;液相色谱串联质谱法;植物生长调节剂;4-氯苯氧乙酸;6-苄基腺嘌呤
Determination of Two Plant Growth Regulators in Bean Sprouts Using Liquid Chromatography-tandem Mass Spectrometry
CUI Min
(Rongcheng Inspection and Testing Center, Rongcheng 264300, China)
Abstract: Objective: To develop a determination method for 4-chlorophenoxyacetate (4-CPA) and 6-benzyl Adenine (6-BA) in bean sprouts by liquid chromatography tandem mass spectrometry (HPLC-MS/MS). Method: the samples were extracted using acidified acetonitrile, and purified through an LC-C18 SPE column. Then the sample solution was separated on a C18 chromatographic column with gradient elution using methanol and 0.1% formic acid containing 5 mmol/L ammonium acetate as the mobile phase, and detected by HPLC-MS/MS under the multiple reaction monitoring(MRM). Result: The two plant growth regulators in range of 10~200 ng/mL with good line (R2≥99.7%). The recoveries ranged from 84.3% to 94.6%, and the RSD was 2.6%~10.3%. The limits of detection and quantification for 4-CPA were 1.54 ?g/kg and 4.28 ?g/kg, and for 6-BaP were 0.237 ?g/kg and 0.459 ?g/kg, respectively. Conclusion: This method is simple and rapid, with the advantages of good linearity, high recovery and precision. It can accurately determine the contents of 4-CPA and 6-BaP in bean sprouts, and meet the requirements of 4-CPA and 6-BAP detection in bean sprouts at home and abroad.
Keywords: bean sprouts; liquid chromatography tandem mass spectrometry (LC-MS/MS); plant growth regulator; 4-chlorophenoxyacetate; 6-benzyl adenine
豆芽是餐桌上常的美食,含有蛋白质、维生素和粗纤维等丰富的营养物质,具有补充人体所需氨基酸、降低胆固醇、促进肠胃蠕动和消肿利尿等作用,深受人们喜爱[1-3]。近年来,不法商贩为了缩短豆芽的生长周期和增加产量,在加工过程中使用了植物生长调节剂,促进植物细胞分裂、生长以及豆芽下胚轴增粗,抑制轴长和根部萌发,以达到加粗豆芽颈部生长的目的[4-6]。人们食用后,能引起恶心、呕吐等胃部不良反应,损害人体皮肤、食道、胃黏膜等,给人们的身体健康造成巨大危害[7-9]。市场监督管理局、农业部、国家卫生和计划生育委员会发布了《关于豆芽生产过程中禁止使用6-苄基腺嘌呤等物质的公告》(2015年第11号),明确规定在豆芽生产过程中禁止使用4-氯苯氧乙酸和6-苄基腺嘌呤等物质[10],并将其列为食品监管领域重点工作,在每年的国家食品安全监督抽检实施细则中均有体现。基于豆芽中植物生长调节剂的测定(BJS 201703)方法[11],采用QuEChERS离心管净化样品时,会损失部分样品提取液,影响试验准确度,因此本研究建立了LC-C18固相萃取柱净化法,净化提取液时抽干萃取柱,损失极少,且操作简单快速,能够准确测定豆芽中4-CPA和6-BAP的含量。
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