Abstract

The usage of ginger (Zingiber officinale) has increased in recent years due to its positive effect on human health affiliated with its richness in gingerols and shogaols. This study optimized the Ultrasound-assisted extraction (UAE) for better phenolic compounds isolation from ginger herbal dust (GHD), a filter tea industry by-product. The extraction was performed using raw and defatted GHD-previously processed by Supercritical fluid extraction – CO2. An additional advantage was using COSMOtherm software for 71 natural deep eutectic solvents (NADES) screening, to select the optimal one for GHD 6-gingerol recovery. As an optimal NADES, Malic acid:Glucose (MA:Glc) in the 1:1 ratio was determined. The optimal MA: Glc-based extract with a 6-gingerol content of 1.90±0.05 mg/g, an antioxidant activity of 321.28±5.09 μmol TE/g, and a favorable toxicological profile was obtained in 2 min of UAE under the sonication amplitude of 20 %, approving the benefits and the sustainability of the present study.

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