中国农业科学 ›› 2020, Vol. 53 ›› Issue (3): 612-631.doi: 10.3864/j.issn.0578-1752.2020.03.013

• 食品科学与工程 • 上一篇    下一篇

超高效液相色谱-串联质谱法鉴定和分析稻米中 酚酸类化合物的组成及分布

赵珊1,仲伶俐1,周虹1,李曦1,雷欣宇1,黄世群1,郑幸果1,冯俊彦2,雷绍荣1,郭灵安1()   

  1. 1 四川省农业科学院分析测试中心/农业部农产品质量安全风险评估实验室(成都),成都 610066
    2 四川省农业科学院生物技术核技术研究所, 成都 610061
  • 收稿日期:2019-06-27 接受日期:2019-11-20 出版日期:2020-02-01 发布日期:2020-02-13
  • 通讯作者: 郭灵安
  • 作者简介:赵珊,Tel:028-84504142;E-mail:zhaoshan11@126.com。
  • 基金资助:
    国家农产品质量安全风险评估重大专项(GJFP201701502);四川省财政创新工程(2017QNJJ-021);四川省财政创新工程(2017QNJJ-001)

Identification and Analysis of Phenolic Acids in Rice Using Ultra-High Performance Liquid Chromatography-Tandem Mass Spectrometry

ZHAO Shan1,ZHONG LingLi1,ZHOU Hong1,LI Xi1,LEI XinYu1,HUANG ShiQun1,ZHENG XingGuo1,FENG JunYan2,LEI ShaoRong1,GUO LingAn1()   

  1. 1 Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences/Risk Assessment Laboratory of Agricultural Products Quality and Safety (Chengdu), Ministry of Agriculture, Chengdu 610066
    2 Institute of Biotechnology and Nuclear Technology, Sichuan Academy of Agricultural Sciences, Chengdu 610061
  • Received:2019-06-27 Accepted:2019-11-20 Online:2020-02-01 Published:2020-02-13
  • Contact: LingAn GUO

摘要:

【目的】水稻是世界上最重要的作物之一,也是人们饮食中酚酸类营养成分的重要来源。建立稻米中酚酸类化合物鉴定与分析的超高效液相色谱-串联质谱(UPLC-MS/MS)检测方法,以深入了解和挖掘稻米的功能性营养。【方法】采用UPLC-MS/MS法对四川收集的白米、红米、紫米和黑米等14份材料中的19种酚酸进行定性和定量分析。优化碱水解、酸水解和净化萃取方法等前处理条件,同时优化色谱柱、流动相条件和质谱条件,并采用电喷雾电离和多反应监测模式进行检测。最后利用优化的分析方法分别测定糙米样品中的游离型、可溶性酯型、可溶性糖苷型、不溶性结合型和不溶性糖苷型酚酸的含量。【结果】通过对前处理条件的比对优化,获得的最优条件为:在含1%抗坏血酸和10 mmol·L -1 EDTA的2 mol·L -1 NaOH浓度下碱水解4 h,在1 mol·L -1 HCl溶液下酸水解1 h;所有净化萃取都使用含0.2% BHA的乙酸乙酯;采用HSS T3色谱柱,乙腈-0.01%甲酸水溶液为流动相进行梯度洗脱;除反式肉桂酸采用正离子模式,其余均为负离子模式,各化合物峰形好、分离度和灵敏度高。19种酚酸的线性范围良好(R 2≥0.9997),检出限在0.023—4.728 μg·L -1,定量限在0.076—15.759 μg·L -1。19种酚酸游离型酚酸提取回收率为55.3%—98.0%,18种酚酸(绿原酸除外)的碱水解和酸水解回收率分别为90.8%—103.1%、51.7%—100.3%。该方法测定的14份稻米中共鉴定出14种酚酸,定量的有12种,酚酸总含量范围为356.3—1 234.5 mg·kg -1,含量较高的有阿魏酸、原儿茶酸、香草酸、4-香豆酸、芥子酸和对羟基苯甲酸,其中原儿茶酸和香草酸主要存在于紫米和黑米中,主要为不溶性结合型、可溶性酯型和可溶性糖苷型酚酸。【结论】该方法准确且灵敏度高。在提取和测定过程中保护剂的加入能有效抑制酚酸的降解,增加游离型和糖苷型酚酸的鉴定与定量分析,能更精确、全面地呈现出稻米中酚酸的分布情况。

关键词: 酚酸, 超高效液相色谱, 串联质谱, 稻米

Abstract:

【Objective】 Rice is one of the most important crops in the world, and it is also an important source of phenolic acids in people’s diet. To further understand and explore the functional nutrition of rice, an ultra-high performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method was established for identification and analysis of rice phenolic acids in the present study. 【Method】 The qualitative and quantitative analysis of 19 phenolic acids in 14 samples of white rice, red rice, purple rice and black rice from Sichuan province, was carried out by UPLC-MS/MS. The pretreatment conditions, including alkali hydrolysis, acid hydrolysis and purification extraction, were optimized, besides, the chromatographic column, mobile phase condition and mass spectrometry conditions were optimized too. Furthermore, all detection was carried out by electrospray ionization and multi reaction monitoring mode. Finally, the content of free ester, soluble ester, soluble glycoside, insoluble binding and insoluble glycoside phenolic acid in brown rice samples was determined by using the optimized analytical method. 【Result】 The optimal conditions were obtained through the comparison and optimization of the pre-treatment conditions. It was as follows: alkaline hydrolysis was 4 hours at the concentration of 1% ascorbic acid and 10 mmol·L -1 EDTA, and acid hydrolysis was 1 hour at the concentration of 1 mol·L -1 HCl; all purification and extraction were carried out with ethylacetate containing 0.2% BHA; HSS T3 column was used, acetonitrile-0.01% formic acid aqueous solution was used as mobile phase for gradient elution; except trans-cinnamic acid adopts positive ion mode, the rest were negative ion mode. The compounds had good peak shape, high resolution and sensitivity. The linear range of 19 phenolic acids was good (R 2≥0.9997), the detection limit was 0.023-4.728 μg·L -1, and the quantitative limit was 0.076-15.759 μg·L -1. Recoveries of 19 phenolic acids in direct extraction were 55.3%-98.0%. Recoveries of 18 phenolic acids (except chlorogenic acid) in alkali hydrolysis and acid hydrolysis were 90.8%-103.1% and 51.7%-100.3%, respectively. In total, there were 14 phenolic acids in 14 rice samples determined using this method, 12 of which were quantitative. The total content range of phenolic acids was 356.3-1 234.5 mg·kg -1. Ferulic acid, protocatechuic acid, vanillic acid, p-coumaric acid, sinapic acid and p-hydroxybenzoic acid had higher content. Protocatechuic acid and vanillic acid could be mainly found in purple rice and black rice, most of which were insoluble binding type, soluble ester type and soluble glycosidic phenolic acid. 【Conclusion】 The method obtained in this study was accurate and sensitive. The addition of protectors effectively inhibited the degradation of phenolic acid and increased the identification and quantitative analysis of free and glycosidic phenolic acid during extraction and determination. Therefore, distribution of phenolic acid could be presented more accurately and comprehensively in rice.

Key words: phenolic acids, ultra-high performance liquid chromatography, tandem mass spectrometry, rice