Afraa Masri (1)*, Rhamez Mohammad (1) and Lina Rayya(2)
(1). Department of Food Sciences, Faculty of Agriculture , Tishreen University, Lattakia. Syria.
(2). General Commission for Scientific Agriculture Research, Damas, Syria.
(*Corresponding author: Afraa Masri. E-Mail: afraamasri90@gmail.com).
Received: 24/04/2022 Accepted: 24/07/2022
Abstract:
This study was carried out in Scientific Agricultural Research Center in Lattakia- Tishreen University in the period between 2021-2022, The study aimed to study the optimal conditions for extracting of mucilage from the root of the Althaea sp by applying six treatments in the extraction, at a rate of three replicates, which are (Water at room temperature + isopropanol A, water at 40 °C + isopropanol B, water at 60 °C + isopropanol C, room temperature water + ethanol D, water at 40 °C ˚ + ethanol E, water at 60 °C ˚ + ethanol F), where the effect of two variables was studied. They are the extraction temperature and the type of solvent used, and the effect of these variables on the yield, organoleptic properties and some physicochemical indicators of the resulting powder. The study and the results of the statistical analysis at the level of significance (1%) showed the effect of the extraction temperature on the color of the resulting powder, as it reached the lowest evaluation with treatments (C, F). اRegarding the physicochemical properties, it was found that they were moderately acidic, and the values ranged between (5.45) for treatment (F) and 6.20)) for treatment (C). Also, all mucilage solutions prepared at 1% concentration were characterized by a high viscosity, which recorded the highest value ((4.562 centipoise for treatment B).therefore the effect of the extraction temperature was negative on the viscosity of the mucilage solutions. In terms of yield, it was observed that there was a joint effect of temperature and type of solvent on the yield percentage. The treatment using isopropanol and incubation at 40°C was superior to obtaining the highest yield (25.82 g/100 g dry weight).
Key words: mucilage, Althaea sp, sensory properties, yield, type of solvent, viscosity.
Full paper in Arabic: pdf