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Evaluation of solar dried thyme (Thymus vulgaris Linné) herbs

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  • Balladin, Derrick A
  • Headley, Oliver

Abstract

Thyme (Thymus vulgaris Linné) herbs can be dried at about 50°C reached an equilibrium moisture content after 12 h and 9.5 h using the wire basket solar dryer and oven drying method respectively. The initial moisture content (wet wt. basis), (final moisture content, dry wt. basis (dwb)) determined by the Dean–Stark toluene method, oven and microwave were 75.15% (10.0%), 75.12% (11.85%) and 72.31% (12.50%) respectively. Paired t-test (α = 0.05, 10 degrees of freedom) showed no significant difference between the Dean–Stark toluene and the oven methods, but a significant difference between these two methods and the microwave method. The % essential oils extracted after drying by the oven and the wire basket solar methods were 0.5 and 0.6% (per 100 g dwb) respectively. The % oleoresin and ash content were 27% for both drying methods and 1.60, 2.03 and 2.25% for the fresh, oven dried and the wire basket solar dried herb respectively.

Suggested Citation

  • Balladin, Derrick A & Headley, Oliver, 1999. "Evaluation of solar dried thyme (Thymus vulgaris Linné) herbs," Renewable Energy, Elsevier, vol. 17(4), pages 523-531.
    • Handle: RePEc:eee:renene:v:17:y:1999:i:4:p:523-531
    DOI: 10.1016/S0960-1481(98)00757-5
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    Cited by:

    1. Gungor, Aysegul & Erbay, Zafer & Hepbasli, Arif, 2011. "Exergetic analysis and evaluation of a new application of gas engine heat pumps (GEHPs) for food drying processes," Applied Energy, Elsevier, vol. 88(3), pages 882-891, March.
    2. Murthy, M.V. Ramana, 2009. "A review of new technologies, models and experimental investigations of solar driers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(4), pages 835-844, May.
    3. Ndukwu, M.C. & Onyenwigwe, D. & Abam, F.I. & Eke, A.B. & Dirioha, C., 2020. "Development of a low-cost wind-powered active solar dryer integrated with glycerol as thermal storage," Renewable Energy, Elsevier, vol. 154(C), pages 553-568.

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