article · Journal of Chemistry
Phenolic compounds from plants have wide applications in medicine and industry, but recovering them efficiently depends heavily on extraction conditions. This research established optimal settings for ultrasound-assisted extraction of polyphenols from the plant Lavandula stoechas. Testing focused on three key operational variables: processing time, ethanol concentration, and the liquid-to-solid solvent ratio. The highest overall extraction yield of 31.88 percent was achieved using 40 percent ethanol, a ratio of 30 millilitres per gram, and a treatment time of 32.62 minutes. Securing the maximum total polyphenol concentration of 190.14 milligrams of gallic acid equivalents per gram required 21.5 minutes under the same solvent and ratio conditions. Operating at 21.5 minutes simultaneously delivered this peak polyphenol concentration alongside an extraction yield of 24.9 percent. Experimental results matched predicted values closely, confirming the validity of the ultrasound extraction model.
Plant-derived polyphenols are valuable ingredients across medical and industrial sectors. Extracting these beneficial compounds can be inefficient and sensitive to processing conditions. Determining precise parameters for ultrasound-assisted extraction allows processors to maximise polyphenol concentration while reducing processing time, supporting more efficient and reliable methods for obtaining natural plant extracts.
This work provides validated operating parameters that could assist industrial and medical manufacturers seeking to isolate polyphenols from Lavandula stoechas. By specifying the exact solvent ratio, ethanol concentration, and processing duration, it provides a protocol for ultrasound extraction. However, the findings represent applied laboratory research, meaning further pilot testing and scale-up work are necessary before commercial implementation.
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Secondary plant metabolites, in particular phenolic compounds, are characterized by great diversity in the plant kingdom and are widely used in the medical and industrial fields. The extraction of these compounds represents a critical step, and the differences in extraction conditions strongly affect the yields and the total concentrations of polyphenols in the extracts. In this way, the objective of the present study was to optimize the extraction parameters of the polyphenols from Lavandula stoechas using the extraction technique assisted by ultrasound. Yield and the total concentration of polyphenols have been optimized, taking into account three variables, the extraction time (min), the ethanol concentration (%), and the solvent/extract ratio (ml/g). The optimum extraction yield (31.88%) was obtained by ensuring the following parameters: an ethanol concentration of 40%, a liquid/solid ratio of 30 ml/g, and a time processing of 32.62 min. The maximum concentration of total polyphenols (190.14 mg gallic acid equivalents (GAE)/g) was obtained after 21.5 min of extraction, with a liquid/solid ratio of 30 ml/g and a concentration of ethanol at 40%. In order to obtain the maximum yield (24.9%) and the total concentration of polyphenols (190.14 mg GAE/g) simultaneously, the following parameters must be adjusted: an extraction time of 21.5 min, a liquid/solid ratio of 30 ml/g, and a concentration of ethanol at 40%. The experimental values of the yield and the total concentration of the polyphenols were in good agreement with the predicted values, which suggests that the ultrasonic extraction model adopted in this study is validated.
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DOI: 10.1155/2021/8830902
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