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2021, Number 4

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Rev Cubana Plant Med 2021; 26 (4)

Adsorption isotherm of water molecules in dry leaves of Justicia Pectoralis Jacq. (linden)

Hernández FYO, Socorro GA, Vega LM

Language: Spanish
References: 18
Page:
PDF size: 277.00 Kb.


ABSTRACT

Introduction: Water molecules in plant materials are held together through attractive forces or are strongly bound to an adsorbent substance. Because of this, the term adsorption is used to denote the water-adsorbent interaction. Linden is a plant species of the Acanthaceae family and for its drying the knowledge of the sorption processes of this species is not always taken into account. Therefore, describing the equilibrium isotherm of this plant is of paramount importance in predicting its shelf life.
Objective: To determine the adsorption isotherm of water molecules in the leaves of Justice pectoralis Jacq. (linden).
Methods: To obtain the isotherm, the analytical technique of hygroscopic equilibrium was used at a temperature of 27±2 ºC. The experimental values were adjusted using the equations of GAB (Guggenheim, Anderson and Boer), BET (Brunauer, Emmett and Teller), Henderson, Smith, DAW (D ́ Arcy-Watt), Halsey, Peleg and Caurie and the curve obtained was classified.
Conclusions: The model that best adjusts the equilibrium moisture content values is that of GAB, which describes the sigmoid behavior of the isotherm and classifies it as Type III. It is shown that dried linden leaves have few adsorption points with relatively strong bonds, so the process of moisture extraction during drying can be carried out in a short time. The results indicate that to be stored safely in the climatic conditions of Cuba, plant material must be dried to humidity between 5 and 8%.


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