Effects of hot air drying method on hypericin extracted content of Hypericum perforatum L. leaves.

Document Type : Research Paper

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Abstract

Drying is considered as one of the important stages after plant harvesting which plays an important role in maintaining the quantity and quality of their active ingredients. St. John's wort (Hypericum perforatum L.) is an important medicinal plant that high percentages of hypericin in its leaves and flowers are considered as the most important feature of the Iranian species. In this research, effect of three treatments including the temperature at three levels of 40, 50 and 60°C, the air velocity at two levels of 0.3 and 1 m/s and the bed depth at two levels of 1 and 2cm were investigated in terms of the effect on extraction of hypericin. Considering the results the highest amount of hypericin was obtained during the drying process at 40°C and in a hot air velocity of 1 m/s and in the bed depth of 1cm and with the amount of 865.41 μg/g dry weight and the lowest was obtained during the drying process at 60°C and the hot air velocity of 0.3 m/s and in the bed depth of 2 cm and with the amount of 587.31 μg/g dry weight.

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References

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Iranian Journal of Biosystems Engineering
Volume 47, Issue 2 - Serial Number 2
September 2016
Pages 301-306

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History

  • Receive Date: 11 August 2015
  • Revise Date: 27 November 2015
  • Accept Date: 02 January 2016

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