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<p>Extraction of polyphenolic compounds from African nutmeg (<i>Monodora myristica</i> (Gaertn.)) peels using natural acidic deep eutectic solvents coupled to ultrasound-assisted extraction (NADESs-UAE) followed many factors at a time (MFAT) screening with response surface optimization was investigated. Fourteen different NADESs based on citric acid as hydrogen bond acceptor (HBA) were designed and tested. Sucrose, fructose, xylitol, glycerol, glycine, and glucose were used as hydrogen bond donors (HBDs). The responses studied are total phenolic compounds (TPC), total flavonoid compounds (TFC), and antioxidant activity (AA) based on cupric ion reducing antioxidant capacity (CUPRAC) and ferric reducing antioxidant power (FRAP). The UAE procedure was optimized with the most efficient NADES. Quadratic models produced satisfactory fitting of the experimental data regarding TPC (R<sup>2</sup> = 0.9999, <i>p</i> &lt; 0.0001), TFC (R<sup>2</sup> = 0.9991, <i>p</i> &lt; 0.0001), and AA- CUPRAC (R<sup>2</sup> = 0.9988, <i>p</i> &lt; 0.0001) and FRAP (R<sup>2</sup> = 1.000, <i>P</i> &lt; 0001). Ultrasound temperature 30°c, extraction time 5&#xa0;min, solvent volume 25&#xa0;ml, and solvent concentration 90% (v/v) were considered optimal conditions for the extraction models resulting in TPC 1290.9 ± 5.6&#xa0;mg/g GAE db, TFC 2398.7 ± 23&#xa0;µg/g QE db, CUPRAC 38.46 ± 0.4.4 µmol/g TE db, and FRAP 26.15 ± 0.11µmol/g TE db, respectively.</p>

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The effects of experimental conditions on extraction of polyphenols from African Nutmeg peels using NADESs-UAE: a multifactorial modelling technique

  • 期刊论文

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  • 发表日期：

    2025年2月10日

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  • Udodinma Jude Okeke,
  • Matteo Micucci,
  • Dasha Mihaylova,
  • Achile Cappiello

摘要

Extraction of polyphenolic compounds from African nutmeg (Monodora myristica (Gaertn.)) peels using natural acidic deep eutectic solvents coupled to ultrasound-assisted extraction (NADESs-UAE) followed many factors at a time (MFAT) screening with response surface optimization was investigated. Fourteen different NADESs based on citric acid as hydrogen bond acceptor (HBA) were designed and tested. Sucrose, fructose, xylitol, glycerol, glycine, and glucose were used as hydrogen bond donors (HBDs). The responses studied are total phenolic compounds (TPC), total flavonoid compounds (TFC), and antioxidant activity (AA) based on cupric ion reducing antioxidant capacity (CUPRAC) and ferric reducing antioxidant power (FRAP). The UAE procedure was optimized with the most efficient NADES. Quadratic models produced satisfactory fitting of the experimental data regarding TPC (R2 = 0.9999, p < 0.0001), TFC (R2 = 0.9991, p < 0.0001), and AA- CUPRAC (R2 = 0.9988, p < 0.0001) and FRAP (R2 = 1.000, P < 0001). Ultrasound temperature 30°c, extraction time 5 min, solvent volume 25 ml, and solvent concentration 90% (v/v) were considered optimal conditions for the extraction models resulting in TPC 1290.9 ± 5.6 mg/g GAE db, TFC 2398.7 ± 23 µg/g QE db, CUPRAC 38.46 ± 0.4.4 µmol/g TE db, and FRAP 26.15 ± 0.11µmol/g TE db, respectively.