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Solar drying of rose (Rosa sp.) petals

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  • Balladin, D.a
  • Headley, Oliver

Abstract

The rose (Rosa sp.) petals can be dried after 2 days at about 30°C reaching an equilibrium moisture content after 16 h using the solar wire basket dryer. The initial moisture content (wet wt basis) and final moisture content (dry wt basis), determined by the Dean–Stark toluene were 65.7 and 25.2% respectively. The intensity of the rose red coloured pigment (pelargonidin) decreased by a factor of 2.5 after drying. The pelargonidin ethanoic extract as an acid-base indicator, has a Ka value of 1×10−4 mol l−1 and pH of end point 4 and imbibed on filter paper and allowed to air dry for 5 min showed excellent properties as acid-base test tapes.

Suggested Citation

  • Balladin, D.a & Headley, Oliver, 1999. "Solar drying of rose (Rosa sp.) petals," Renewable Energy, Elsevier, vol. 18(2), pages 249-255.
    • Handle: RePEc:eee:renene:v:18:y:1999:i:2:p:249-255
    DOI: 10.1016/S0960-1481(98)00765-4
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    Cited by:

    1. 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.

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