Optimization of the sonication extraction method of Hibiscus tiliaceus L. flowers

Abstract

The influence of several experimental parameters on the ultrasonic extraction of Hibiscus tiliaceus L. flowers were investigated: extraction time, solvent polarity, sample amount, solvent volume and sample particle size. It was concluded that the most influential variables were extraction time and solvent polarity. The optimized procedure employed 5 g of ground flowers, 150 mL of methanol and 140 min of extraction. The extracts were fractionated using preparative silica columns and the resulting fractions were analyzed by GC/MS. Some saturated hydrocarbons, fatty acids, fatty acid methyl esters, phytosterols, and vitamin E were identified in the plant extracts.

Comparison of Free Radical Scavenging Activity of Siamese Neem Tree (<i>Azadirachta indica</i> A. Juss var. <i>siamensis</i> Valeton) Leaf Extracts Prepared by Different Methods of Extraction

“…As it is economical, the decoction extraction method can be used in other countries, especially in developing countries. However, many modern extraction methods have been studied and developed for preparation of plant extracts; these include ultrasonic extraction [7] , microwaveassisted extraction [8] and pressurized liquid extract [9] . These methods have different advantages that include improvement of the penetration of solvent into plant particles and using low extraction temperature that effects the stability of active components for ultrasonic extraction [7] .…”

“…However, many modern extraction methods have been studied and developed for preparation of plant extracts; these include ultrasonic extraction [7] , microwaveassisted extraction [8] and pressurized liquid extract [9] . These methods have different advantages that include improvement of the penetration of solvent into plant particles and using low extraction temperature that effects the stability of active components for ultrasonic extraction [7] . The microwave-assisted method promotes better yield and fast-speed extraction process of specifi c active components such as glycyrrhizic acid in liquorice [8] .…”

Comprehensive two-dimensional gas chromatography and three-dimensional fluorometry for detection of volatile and bioactive substances in some berries

“…The results shown in Table 2 slightly differ from the results reported previously [2,12], depending on the solvent used, its ratio to the dry material and also on the time and type of extraction. The optimization of ultrasound operational parameters (solvent polarity, sample particle size), according to a specific plant matrix (leaves, flowers, stems) is also of main importance in order to achieve high extraction efficiency [23]. Sonication time and the temperature were optimized based on our previous results and the highest polyphenol concentration and antioxidant capacity [19].…”

Evaluation of pharmacological activity of Hibiscus tiliaceus

“…Fresh bark soaked in water was used for chest congestion and during birth (Polynesians), whereas the inner bark (with sap) soaked in water was used for labor pains and rubbed on stomach. The slimy sap of the bark, branches and flower buds were used as a mild laxative or as a lubricant in childbirth or labor pains and rubbed on stomach (Melecchi et al 2006; Petard 1986). Before children had teeth, the mothers chewed the buds and gave the chewed material to the children to swallow.…”