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<p>Ginger (<i>Zingiber officinale</i>) is a spice with a unique nutritional composition and a range of bioactive compounds. It enhances food value by improving its flavor and preventing health problems through its bioactive compounds. The effect of drying on the nutritional and antioxidant properties of Ethiopian Boziab ginger genotype was investigated to select the most preferred drying method that retains the most nutritional value and bioactive compounds in its postharvest management. The four drying methods used in the study were fluid bed, hot-air oven, solar tunnel, and open-air sun energy. The nutrient, phytochemical, and antioxidant values showed significant differences (<i>p</i> &lt; 0.05) depending on the drying method. The moisture values ranged from 5.99 ± 0.29% to 7.47 ± 0.34% for the solar tunnel and open-air sun drying methods, respectively. Generally, the highest value of crude protein (9.47 ± 0.43%), crude fat (10.55 ± 0.26%), crude fiber (12.13 ± 0.19%), and ash (7.19 ± 0.06%) was reported from the fluid-bed dryer. However, the highest value of carbohydrate (69.07 ± 0.20%) and gross energy (402.19 ± 4.01&#xa0;kcal) was reported from the solar tunnel dryer. The highest mineral contents (µg/g): Ca (679.33 ± 1.53), Na (297.83 ± 1.90), and Z (16.33 ± 1.53) were reported from both fluid-bed and solar tunnel dryers. The value of K (564.67 ± 2.52), and Fe (33.45 ± 2.31) were reported from solar tunnel dryer. The highest value of total phenolic content (45.7 ± 0.43&#xa0;mg GAE/g), total flavonoid content (81.73 ± 0.26&#xa0;mg CE/g), and antioxidant activity of the ferric reducing power (83.1 ± 1.84&#xa0;mg AAE/g) was obtained from the fluid-bed dryer. The antioxidant potential by the DPPH method from the solar tunnel dryer had the highest value of (93.8 ± 1.84%) with the strongest free radical scavenging. Thus, the superiority of fluid-bed drying for retaining nutrients and strongest antioxidants, combined with the cost-effectiveness of solar drying, is significant for ginger growers, small-scale processors, and all users of ginger products. Both drying methods exhibited higher nutritional, phytochemical, and antioxidant content compared to the others, with fluid-bed drying showing superiority. The future development and processing of ginger for medicinal benefits requires selecting a method that retains its nutrients and bioactive compounds. It must be accompanied by other methods that meet standard quality requirements for both exports and domestic consumption.</p>

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Effect of drying on nutritional content and antioxidant activity of ginger (Zingiber officinale) genotype from Ethiopia

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Temesgen Laelago Ersedo,
  • Tilahun A. Teka,
  • Sirawdink Fikreyesus Forsido,
  • Engida Dessalegn

摘要

Ginger (Zingiber officinale) is a spice with a unique nutritional composition and a range of bioactive compounds. It enhances food value by improving its flavor and preventing health problems through its bioactive compounds. The effect of drying on the nutritional and antioxidant properties of Ethiopian Boziab ginger genotype was investigated to select the most preferred drying method that retains the most nutritional value and bioactive compounds in its postharvest management. The four drying methods used in the study were fluid bed, hot-air oven, solar tunnel, and open-air sun energy. The nutrient, phytochemical, and antioxidant values showed significant differences (p < 0.05) depending on the drying method. The moisture values ranged from 5.99 ± 0.29% to 7.47 ± 0.34% for the solar tunnel and open-air sun drying methods, respectively. Generally, the highest value of crude protein (9.47 ± 0.43%), crude fat (10.55 ± 0.26%), crude fiber (12.13 ± 0.19%), and ash (7.19 ± 0.06%) was reported from the fluid-bed dryer. However, the highest value of carbohydrate (69.07 ± 0.20%) and gross energy (402.19 ± 4.01 kcal) was reported from the solar tunnel dryer. The highest mineral contents (µg/g): Ca (679.33 ± 1.53), Na (297.83 ± 1.90), and Z (16.33 ± 1.53) were reported from both fluid-bed and solar tunnel dryers. The value of K (564.67 ± 2.52), and Fe (33.45 ± 2.31) were reported from solar tunnel dryer. The highest value of total phenolic content (45.7 ± 0.43 mg GAE/g), total flavonoid content (81.73 ± 0.26 mg CE/g), and antioxidant activity of the ferric reducing power (83.1 ± 1.84 mg AAE/g) was obtained from the fluid-bed dryer. The antioxidant potential by the DPPH method from the solar tunnel dryer had the highest value of (93.8 ± 1.84%) with the strongest free radical scavenging. Thus, the superiority of fluid-bed drying for retaining nutrients and strongest antioxidants, combined with the cost-effectiveness of solar drying, is significant for ginger growers, small-scale processors, and all users of ginger products. Both drying methods exhibited higher nutritional, phytochemical, and antioxidant content compared to the others, with fluid-bed drying showing superiority. The future development and processing of ginger for medicinal benefits requires selecting a method that retains its nutrients and bioactive compounds. It must be accompanied by other methods that meet standard quality requirements for both exports and domestic consumption.