Compositional and biochemical activity evaluation of highly polymerized tea pigments in black tea based on natural deep eutectic solvent extraction

IF 6.5 1区农林科学 Q1 CHEMISTRY, APPLIED

Food Chemistry: X Pub Date : 2025-04-01 DOI:10.1016/j.fochx.2025.102413

Di Wang , Yang Liu , Bin Zeng , Yuqin Xu , Sheng Cao , Yuanyan Luo , Shuangling Xiao , Jie Teng

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引用次数: 0

Abstract

Highly polymeric tea pigments (HPTPs) in black tea have not been comprehensively analyzed because of the complex composition of their structural components. 14 natural deep eutectic solvents (NADESs) were evaluated for extracting HPTPs from black tea, and choline chloride-urea (ChCl-UA) was selected as the best candidate. The HPTPs were separated from the NADES using a dialysis membrane. Microstructural analysis was conducted by XRD, SEM, and AFM, combined with thermal property analysis using TG-DSC and Py-GC–MS determination of biochemical components, and structural analysis through UV–visible, FT-IR, NMR, and SERS spectroscopies. The antioxidant activity analyzed using ABTS, DPPH, and FRAP assays. The results revealed that the extract obtained using the ChCl-UA has a higher tea pigment content, greater polymerization degree, and simpler impurities. The extraction of HPTPs using a NADES and the analysis of the chemical composition and structural characteristics of the extract are helpful for understanding the macromolecular pigments in tea.

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来源期刊

Food Chemistry: X CHEMISTRY, APPLIED-

CiteScore

4.90

自引率

6.60%

发文量

315

审稿时长

55 days

期刊介绍： Food Chemistry: X, one of three Open Access companion journals to Food Chemistry, follows the same aims, scope, and peer-review process. It focuses on papers advancing food and biochemistry or analytical methods, prioritizing research novelty. Manuscript evaluation considers novelty, scientific rigor, field advancement, and reader interest. Excluded are studies on food molecular sciences or disease cure/prevention. Topics include food component chemistry, bioactives, processing effects, additives, contaminants, and analytical methods. The journal welcome Analytical Papers addressing food microbiology, sensory aspects, and more, emphasizing new methods with robust validation and applicability to diverse foods or regions.