Journal of
Stored Products and Postharvest Research

  • Abbreviation: J. Stored Prod. Postharvest Res.
  • Language: English
  • ISSN: 2141-6567
  • DOI: 10.5897/JSPPR
  • Start Year: 2010
  • Published Articles: 147

Full Length Research Paper

Evaluation of the storage and drying processes of Melissa officinalis L. leaves

Rosana Gonçalves Rodrigues-das-Dores1*, Juliana Cristina Santos Almeida Bastos1, Viviane Flores Xavier1, Fernanda de Souza Marques1, Fernando Luis Finger2 and Vicente Wagner Dias Casali2  
1Laboratory of Medicinal Plants and Phytotherapy, Health Center. Federal University of Ouro Preto, Ouro Preto, Minas Gerais, Brazil. 2Departmento of de Plant Science, Agricultural Science Center, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil.  
Email: [email protected]

  •  Received: 01 September 2018
  •  Accepted: 25 September 2018
  •  Published: 31 October 2018

Abstract

Melissa officinalis L. (Lamiaceae), medicinal plant used as sedative commercialized in natura and as dry plant in Brazil. The aim of this study was to determine the postharvest life and drying processes of Melissa leaves in function of essential oil contents. Leaves (10 g) were stored at room temperature (RT=19.6°C) and refrigeration temperature (10°C, AR), measured daily loss of fresh mass. In the evaluation, the drying processes used were microwave equipment (MW), thin-layer drying (TLD) and conventional oven (CO). The essential oil was obtained by the Clevenger apparatus. All treatments were done with four replicates and the data compared at 5% significance. The efficiency of the storage process was more effective in RT (ŷ=9.5222x2-51.271x+98.981; R2=0.99) with shelf-life of three days. AR had chilling causing a loss of essential oil and making commercialization impossible. The ideal wet mass was estimated to be between 2.70 and 2.83 g (ideal theoretical drying point) and the best dryings occurred in CO and TLD. The essential oil contents decreased in function of inadequate drying (MW), in relation to TLD and CO. The most suitable drying was in conventional oven (CO) and the major shelf-life time at room temperature (RT) and both processes had the best biomarker preservation.

Key words: Postharvest, shelf-life, medicinal plant, drying process, quality control, bio-actives.