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Ghafoor, Kashif; Al Juhaimi, Fahad; Özcan, Mehmet Musa; Uslu, Nurhan; Babiker, Elfadıl E.; Mohamed Ahmed, Isam A.
Food science & technology, 20/May , Volume: 126Journal Article
This study was conducted to evaluate total phenolic content, antioxidant activity, total carotenoids and phenolic compounds of ginger (Zingiber officinale) rhizomes dried using different drying methods (oven, microwave, freeze and room-air drying). Freeze-dried ginger rhizomes exhibited significantly (p < 0.05) higher total phenolics (931.94 mgGAE/100 g), antioxidant activity (82.00%) and total carotenoids (13.17 μg/g) than those dried using other techniques. Oven-dried ginger showed higher values for all individual phenolic compounds detected in this study as compared to those dried using other methods. The dominant phenolic compounds of dried ginger included (+)-catechin (250.02 mg/100 g), gallic acid (197.03 mg/100 g) and 3, 4-dihydroxybenzoic acid (116.07 mg/100 g). Drying of ginger rhizome using oven and freeze-drying methods my result in improved contents of bioactive compounds and higher antioxidant activity. Correlation analyses for biochemical composition of ginger rhizomes showed that total phenolics were positively correlated with antioxidant activity (r2 = 0.973, p < 0.001). •Ginger rhizome contains valuable bioactive compounds with health properties.•Drying of ginger may affect its biologically important chemical constituents.•A comparative study of oven, microwave, freeze and air drying of ginger.•Freeze dried ginger had higher total phenolics and total carotenoids.•Oven dried ginger showed improved phenolic compounds availability.
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