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Thermophysical characterization by solar convective drying of thyme conserved by an innovative thermal-biochemical process

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  • Lahnine, Lamyae
  • Idlimam, Ali
  • Mostafa Mahrouz,
  • Mghazli, Safa
  • Hidar, Nadia
  • Hanine, Hafida
  • Koutit, Abbes

Abstract

The solar drying for preservation of food products is the most attractive and promising application. It leads to reduce the water activity in the product and thereby prolongs its shelf life by decreasing the microbial contamination. Thymus satureioides, a medicinal and aromatic plant, was conserved using a nondestructive innovative preservation process integrating sustainable energy. The process is based on a combination of pretreatment by aqueous solutions of natural organic acid followed by a partial solar convective drying. Therefore, it is overridden to understand the mechanisms influencing the treated thyme drying process compared with the drying kinetics of witness thyme. The effect of drying conditions (season, temperature ranging from 50 to 80 °C and drying volume flow rates of 150 and 300 m3/h) and the pretreatment conditions (concentration and volume of citric acid) on the process efficiency were studied. Furthermore, the effects of temperature, season, drying volume flow rates and citric acid on drying rate and total phenolic content were also investigated. Moreover, nine mathematical models have been used to describe the drying curves. The best mathematical models which represented treated and witness thyme were Wang-Singh and Midilli-Kucuk models. Hence, the characteristic drying curve of the pretreated product was determined.

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  • Lahnine, Lamyae & Idlimam, Ali & Mostafa Mahrouz, & Mghazli, Safa & Hidar, Nadia & Hanine, Hafida & Koutit, Abbes, 2016. "Thermophysical characterization by solar convective drying of thyme conserved by an innovative thermal-biochemical process," Renewable Energy, Elsevier, vol. 94(C), pages 72-80.
    • Handle: RePEc:eee:renene:v:94:y:2016:i:c:p:72-80
    DOI: 10.1016/j.renene.2016.03.014
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    1. Bahammou, Younes & Lamsyehe, Hamza & Kouhila, Mounir & Lamharrar, Abdelkader & Idlimam, Ali & Abdenouri, Naji, 2019. "Valorization of co-products of sardine waste by physical treatment under natural and forced convection solar drying," Renewable Energy, Elsevier, vol. 142(C), pages 110-122.
    2. Hidar, Nadia & Ouhammou, Mourad & Mghazli, Safa & Idlimam, Ali & Hajjaj, Abdessamad & Bouchdoug, Mohamed & Jaouad, Abderrahim & Mahrouz, Mostafa, 2020. "The impact of solar convective drying on kinetics, bioactive compounds and microstructure of stevia leaves," Renewable Energy, Elsevier, vol. 161(C), pages 1176-1183.
    3. Hamza, Lamsyehe & Mounir, Kouhila & Younes, Bahammou & Zakaria, Tagnamas & Haytem, Moussaoui & Hind, Mouhanni & Abdelkader, Lamharrar & Ali, Idlimam, 2020. "Physicochemical study of the conservation of Moroccan anchovies by convective solar drying," Renewable Energy, Elsevier, vol. 152(C), pages 44-54.
    4. Mghazli, Safa & Ouhammou, Mourad & Hidar, Nadia & Lahnine, Lamyae & Idlimam, Ali & Mahrouz, Mostafa, 2017. "Drying characteristics and kinetics solar drying of Moroccan rosemary leaves," Renewable Energy, Elsevier, vol. 108(C), pages 303-310.
    5. Moussaoui, Haytem & Bahammou, Younes & Tagnamas, Zakaria & Kouhila, Mounir & Lamharrar, Abdelkader & Idlimam, Ali, 2021. "Application of solar drying on the apple peels using an indirect hybrid solar-electrical forced convection dryer," Renewable Energy, Elsevier, vol. 168(C), pages 131-140.
    6. Amer, Baher M.A. & Gottschalk, Klaus & Hossain, M.A., 2018. "Integrated hybrid solar drying system and its drying kinetics of chamomile," Renewable Energy, Elsevier, vol. 121(C), pages 539-547.
    7. Yahya, M. & Fudholi, Ahmad & Sopian, Kamaruzzaman, 2017. "Energy and exergy analyses of solar-assisted fluidized bed drying integrated with biomass furnace," Renewable Energy, Elsevier, vol. 105(C), pages 22-29.

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