食品科学

• 分析检测 • 上一篇    下一篇

HPLC在线检测果汁抗氧化成分

张 强,张京芳,苏印泉   

  1. 西北农林科技大学林学院,陕西 杨凌 712100
  • 出版日期:2013-06-25 发布日期:2013-06-17

On-line HPLC Determination of Antioxidants in Fruit Juice

ZHANG Qiang,ZHANG Jing-fang,SU Yin-quan   

  1. College of Forestry, Northwest A&F University, Yangling 712100, China
  • Online:2013-06-25 Published:2013-06-17

摘要:

为快速检测混合物中抗氧化成分,以ABTS+•为检测自由基,建立了在线HPLC检测方法。以芦丁为模式化合物,信噪比为指标,在线优化系统设置为浓度0.32mmol/L的自由基溶液以0.5mL/min流速经由10.0m长反应圈输送。该方法对芦丁等4种天然抗氧化剂最低检测浓度为0.12~0.37μmol/L。利用该方法在一种果汁的叔丁基甲醚萃取物中发现约20种抗氧化成分,以液质联用仪确定该萃取物最主要的抗氧化成分是绿原酸及其类似物。这种HPLC在线方法简单、便捷、快速,可用于所有可溶性混合物中抗氧化成分的在线检测。

关键词: 抗氧化成分, 自由基, 在线检测

Abstract:

An on-line HPLC method was developed to analyze natural antioxidants in a mixed juice by testing ABTS
radical scavenging activity. Rutin was used as a model antioxidant. Optimized system settings for improved RSN (signal/
noise) were obtained when 0.32 mmol/L ABTS radical solution was flowed through a 10.0 m reaction coil at a flow rate
0.5 mL/min. The limits of detection of the method for rutin, ascorbic acid, quercetin and α-tocopherol were in the range of
0.12-0.37 μmol/L. About 20 antioixdants were detected in the tert-butyl methyl ether of a commercial mixed juice by this
method. The most dominant antioxidants in the extract were chlorogenic acid and a compound similar structure. This method
is simple, convinent, fast and suitable for online assay of soluble antioxidants.

Key words: antioxidant, free radical, on-line detection