Determination of Flavonoid Compounds in Shanxi Aged Vinegars Based on Hydrophobic Deep Eutectic Solvent VALLME-HPLC Method: Assessment of the Environmental Impact of the Developed Method

• Published in: Molecules (Basel, Switzerland) Vol. 28; no. 14; p. 5619
• Main Authors: Bai, Baoqing, Guo, Yanli, Meng, Siyuan, Chen, Shujun, Bo, Tao, Zhang, Jinhua, Shen, Dan, Liu, Yifei, Yang, Yukun, Fan, Sanhong
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 24.07.2023; MDPI
• Subjects: Acetic Acid; Analysis; Analytical chemistry; Chloride; Chromatography; Chromatography, High Pressure Liquid - methods; Deep Eutectic Solvents; Efficiency; Environment; flavonoid; Flavonoids; green analysis; High performance liquid chromatography; Hydrogen bonds; hydrophobic deep eutectic solvent; Isoflavones; Limit of Detection; Liquid Phase Microextraction - methods; Methods; NMR; Nuclear magnetic resonance; Reproducibility of Results; Shanxi aged vinegar; Solvent extraction processes; Solvents - chemistry; Viscosity; vortex-assisted liquid–liquid microextraction; China; hydrophobic deep eutectic solvent; flavonoid; green analysis; vortex-assisted liquid–liquid microextraction; Shanxi aged vinegar
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules28145619

This research presents a novel, eco-friendly, vortex-assisted liquid-liquid microextraction (VALLME) approach, integrating hydrophobic deep eutectic solvents (DESs) with HPLC for the identification and quantification of nine specific flavonoids in Shanxi aged vinegar (SAV). The parameters of DES-VALLME, including the ratio of trioctylmethylammonium chloride to 1,4-butanediol (1:6), DES volume (150 μL), vortex duration (5 min), the concentration of NaCl (0.40 g), and centrifugation time (10 min), were optimized to achieve the maximum extraction efficiency of target substances. Under these optimal conditions, quantitative analyses performed via HPLC demonstrated a broad linear range of 0.20-50.00 μg/mL and correlation coefficients (r ) greater than 0.9944 for all nine calibration curves. The limits of detection (LOD) and limits of quantitation (LOQ) were 0.09-0.18 μg/mL and 0.30-0.60 μg/mL, respectively, ensuring high sensitivity. The relative standard deviations for intra-day and inter-day variability were within the acceptable range, 2.34-3.77% and 3.04-4.96%, respectively, demonstrating the method's reliability. The recovery rates ranged from 85.97% to 108.11%, underscoring the method's precision. This technique exhibited a significant enrichment effect (enrichment factor: 43 to 296) on SAV flavonoids. Notably, the eco-friendliness of this procedure was evaluated using the Analytical Eco-Scale, Green Analytical Procedure Index, and Analytical Greenness Metric. The results suggested that this technique is a viable green alternative to traditional flavonoid determination methods in SAV. In summary, this novel method provides a theoretical basis for assessing flavonoid content in SAV samples and tracing SAV products. This contribution has significant implications for enhancing analytical techniques in food chemistry and environmental science and the sustainable development of the food industry.