Effect of drying methods on physical and chemical properties of Ilex guayusa leaves

• Published in: Revista Facultad Nacional de Agronomía, Medellín Vol. 71; no. 3; pp. 8617 - 8622
• Main Authors: Patricia Manzano Santana, Quijano-Avilés, María, Chóez-Guaranda, Ivan, Ana Barragán Lucas, Espinoza, Rafael Viteri, Martínez, Daysi, Camacho, Cinthia, Migdalia Miranda Martinez
• Format: Journal Article
• Language: English
• Published: Bogota Universidad Nacional de Colombia 01-09-2018; Facultad de Ciencias Agrarias - Universidad Nacional de Colombia; Universidad Nacional de Colombia, Sede Medellín
• Subjects: AGRONOMY; Air drying; Alkaloids; Ashes; Bioactive compounds; Biological activity; Caffeine; Chemical properties; Convection; Conventional oven; Drying; Drying ovens; Ethanol; Fats; Flavonoids; Ilex guayusa; Leaves; Metabolites; Organic chemistry; Phenols; Physical analysis; Quinones; Saponins; Secondary metabolites; Solar drying; Steroid hormones; Steroids; Sugar; Tannins; Secado al aire; Air drying; Cafeína; Secado solar; Solar drying; Ilex guayusa; Horno convencional; Conventional oven; Caffeine
• ISSN: 0304-2847; 2248-7026; 2248-7026
• DOI: 10.15446/rfnam.v71n3.71667

The influence of air-drying (AD), convection oven (CO) and solar drying (SOD) on the physical and chemical properties of Ilex guayusa leaves is discussed. Total ash (%), acid-insoluble ash (%), watersoluble ash (%), residual moisture (%) and caffeine content (%) were estimated. Additionally, alkaloids, flavonoids, reducing sugars, saponins, steroids, quinones, fats, phenols and tannins detection of dry leaves extracts were assessed. The results revealed that parameters of physical analysis were not affected by the drying techniques. The highest amount of secondary metabolites in ethanol and aqueous extracts were detected. In general, convection oven dried leaves showed the highest caffeine content (3.71%) and the lowest drying time (13 h) compared to other drying methods. The results revealed a fast method to dry Ilex guayusa leaves and indicate that this species possess a variety of bioactive compounds beneficial for health. Our results revealed an effective quick method to dry Ilex guayusa leaves without altering the content of beneficial bioactive components.