食品科学 ›› 2022, Vol. 43 ›› Issue (20): 352-360.doi: 10.7506/spkx1002-6630-20211224-280

• 安全检测 • 上一篇    下一篇

基于咖啡碱和氨基酸中碳氮稳定同位素比率的茶叶地理溯源

刘洪林,张凯,黎娇,李照,杨天来,王强   

  1. (1.重庆第二师范学院 脂质资源利用及儿童日化品研发重点实验室,重庆 400067;2.重庆第二师范学院旅游与服务管理学院,重庆 400067;3.重庆市农业技术推广总站,重庆 401121;4.重庆市规划和自然资源调查监测院,重庆 400014;5.西南大学食品科学学院,重庆 400715)
  • 出版日期:2022-10-25 发布日期:2022-10-26
  • 基金资助:
    2022年重庆市教育委员会人文社会科学研究项目规划项目(22SKGH450); 2022年重庆市自然科学基金项目(2022NSCQ-MSX5393);2022年重庆市教育委员会科学技术研究项目(KJQN202201619); 重庆市人文社科重点研究基地“重庆市统筹城乡教师教育研究中心”专项(JDKT202209); 重庆第二师范学院科研平台(区域旅游产业发展研究协同创新中心)项目(2021XJPT07); 重庆第二师范学院第三批校级研究所(川渝地区乡村旅游产业发展研究所)项目; 重庆市教委科学技术研究计划项目(KJQN201901603;KJQN202001603); 重庆市高等教育教学改革研究项目(213374;213367); 重庆市教育科学“十四五”规划重点课题项目(2021-GX-146)

Geographical Traceability of Tea Based on Carbon and Nitrogen Stable Isotope Ratios in Caffeine and Amino Acids

LIU Honglin, ZHANG Kai, LI Jiao, LI Zhao, YANG Tianlai, WANG Qiang   

  1. (1. Key Laboratory of Lipid Resource Utilization and Children’s Daily Chemical Products, Chongqing University of Education, Chongqing 400067, China; 2. College of Tourism and Service Management, Chongqing University of Education, Chongqing 400067, China; 3. Chongqing Agricultural Technology Extension Station, Chongqing 401121, China; 4. Chongqing Planning and Natural Resources Survey and Monitoring Institute, Chongqing 400014, China; 5. College of Food Science, Southwest University, Chongqing 400715, China)
  • Online:2022-10-25 Published:2022-10-26

摘要: 采用咖啡碱和氨基酸中碳氮稳定同位素比率分析方法,基于气相色谱-燃烧-同位素比值质谱(gas chromatography combustion isotope ratio mass spectrometry,GC-C-IRMS)开展不同产地茶叶地理溯源技术研究。结果表明,基于GC-C-IRMS特异性化合物稳定同位素比值分析方法可以用于茶叶地理溯源;化学计量学分析表明,本方法可以对不同产地茶叶进行有效区分,预测和验证准确率均达到85%以上,BP人工神经网络认证性能最优,预测和验证准确率均达到100%;经过进一步筛选和鉴定,得到不同产地秀芽的2 种特征标识化合物——δ15N丙氨酸和δ13C茶氨酸。本研究可为茶叶地理溯源提供一定技术支撑,有利于茶叶产品的认证体系的建立和完善。

关键词: 茶叶;地理溯源;咖啡碱;氨基酸;碳氮稳定性同位素比率

Abstract: The geographical traceability of tea from different production areas was studied by gas chromatography combustion isotope ratio mass spectrometry (GC-C-IRMS) based on carbon and nitrogen stable isotope ratios in caffeine and amino acids. The results showed that GC-C-IRMS combined with compound specific stable isotope ratio analysis could be used to trace the geographical origin of tea. Chemometrics analysis showed that this method could effectively distinguish tea from different production areas, with accuracy of prediction and verification more than 85%. BP artificial neural network had the best authentication performance, with accuracy of prediction and verification of 100%. After further screening and identification, two characteristic marker compounds, δ15Nalanine and δ13Ctheanine, were obtained for Xiuya green tea from different production areas. This study can provide some technical support for geographical traceability of tea and help to establish a sound certification system for tea products.

Key words: tea; geographical traceability; caffeine; amino acids; carbon and nitrogen stable isotope ratios

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