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Visual Analysis of L-Theanine Research and Progress in Its Functional Activity and Food Application
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Jiayin FU1, Longhua WANG1, Ruirui YAN1, Hanyue YANG1, Yongkun LI1, Fei YAN1, 2, 3, *, Dong QU1, 3, *
Science and Technology of Food Industry | 2026, 47(1) : 477 - 487
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Science and Technology of Food Industry | 2026, 47(1): 477-487
• Reviews •
Visual Analysis of L-Theanine Research and Progress in Its Functional Activity and Food Application
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Jiayin FU1, Longhua WANG1, Ruirui YAN1, Hanyue YANG1, Yongkun LI1, Fei YAN1, 2, 3, *, Dong QU1, 3, *
Affiliations
  • 1Shaanxi Key Laboratory Bio-resources, College of Biological Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China
  • 2Qinling-Bashan Mountains Bioresources Comprehensive Development Collaborative Innovation Center, Shaanxi University of Technology, Hanzhong 723001, China
  • 3Qinba State Key Laboratory of Biological Resources and Ecological Environment, Shaanxi University of Technology, Hanzhong 723001, China
Published: 2026-01-01 doi: 10.13386/j.issn1002-0306.2024120316
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L-Theanine (LTA), a distinctive free amino acid in tea, is the major contributor to the sweet and fresh taste in tea infusions. As a novel food ingredient, it exhibits a wide range of biological activities. This study screens the Web of Science Core Collection and China National Knowledge Infrastructure databases of LTA-related literature from 2014 to 2024 and utilizes Citespace and VOSviewer for a visual analysis. Keyword density and contribution mapping indicate that LTA research predominantly centers on tea varieties, stress responses, and the biological activities of LTA. Consequently, this review synthesizes the factors influencing LTA content in tea and elucidates the mechanisms underlying LTA's biological activities, including antioxidant, heat stress resistance, antidepressant, metabolic regulation, anti-cancer, immune regulation, gut microbiota modulation, neuroprotective, hepatoprotective and intestinal protective effects. The collective evidence indicates that LTA mediates its biological functions primarily through the modulation of signaling pathways such as nuclear factor kappa B (NF-κB), c-Jun N-terminal kinase (JNK), signal transducer and activator of transcription (STAT) and mitogen-activated protein kinase (MAPK). Furthermore, the current applications of LTA in the food industry are summarized. This review aims to provide direction for LTA research and development and offer a reference for the formulation of LTA-based functional foods.

L-theanine  /  visual analysis  /  functional activity  /  mechanism of action  /  food application
付佳音, 王龙华, 闫瑞瑞, 杨涵越, 李永焜, 燕飞, 曲东. L-茶氨酸研究的可视化分析及其功能活性和食品应用研究进展. 食品工业科技, 2026 , 47 (1) : 477 -487 . DOI: 10.13386/j.issn1002-0306.2024120316
Jiayin FU, Longhua WANG, Ruirui YAN, Hanyue YANG, Yongkun LI, Fei YAN, Dong QU. Visual Analysis of L-Theanine Research and Progress in Its Functional Activity and Food Application[J]. Science and Technology of Food Industry, 2026 , 47 (1) : 477 -487 . DOI: 10.13386/j.issn1002-0306.2024120316
Appendix
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Year 2026 volume 47 Issue 1
93
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doi: 10.13386/j.issn1002-0306.2024120316
  • Receive Date：2024-12-26
  • Online Date：2026-10-24
  • Published：2026-01-01
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  • Received：2024-12-26
Affiliations
    1Shaanxi Key Laboratory Bio-resources, College of Biological Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China
    2Qinling-Bashan Mountains Bioresources Comprehensive Development Collaborative Innovation Center, Shaanxi University of Technology, Hanzhong 723001, China
    3Qinba State Key Laboratory of Biological Resources and Ecological Environment, Shaanxi University of Technology, Hanzhong 723001, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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