Optimization of extraction of phenolics from Inga edulis leaves using response surface methodology (original) (raw)
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International Journal of Food Science and Technology, 2010
Pink guava puree industry produces huge amount of by-products that have potential as sources for polyphenols. Response surface methodology was implemented to optimise the extraction conditions for phenolics (Y1) and flavonoids (Y2) from a by-product of the guava industry. A three-factor inscribed central composite design was employed to determine the effects of three independent variables, namely pH (X1: 2–6), temperature (X2: 40–60 °C) and time (X3: 1–5 h), on the response variables. The corresponding predicted values for phenolics and flavonoids were 336.30 and 427.35 mg 100 g−1, respectively. Predicted values for extraction rates of phenolics agreed well with experiment values; R2 of 0.902. However, the model derived for flavonoids extraction was less reliable; R2 of 0.983. Increase in time and temperature was found significant in increasing the extraction rate. The optimum conditions for extracting phenolics by ethanolic solvent occurred at a pH of 2 and 60 °C for a 5-h extraction.
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2016
Extraction of polyphenols from Inulaviscosa (L.) leaves has been studied using water as a green solvent. Optimization of the process was performed using response surface methodology (RSM) in order to investigate the effects of three operating parameters, temperature, solid to liquid ratio and stirring speed (ω) in the following ranges : (28-56 ° C), (2-58 g.L-1) and (60-341 rpm), respectively. The efficiency of extraction was assessed by measuring polyphenols, flavonoids, and anthocyanins contents as well as antiradical activity. The conditions optimizing the yield of polyphenols and antiradical activity were established (T=50°C, S/L= 3 g.L-1, ω= 217 rpm). Under these conditions, polyphenols content was estimated to 291 mg GAE .g DW-1, and antiradical power was 83%. Purification of the extract obtained under these optimal extraction conditions increased the antiradical activity to 90%. This antiradical activity is medium (Antiradical efficiency = 10-3 g DPPH°. (mg AO. min)-1) with a...
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South African Journal of Chemistry
The main goal was to optimize and establish the kinetics and the thermodynamics of the extraction process. An investigation into the effects of ethanol concentration (0-100 %), liquid to solid ratio (30-60 mL g-1), extraction temperature (25-65 °C), and extraction time (40-200 min) on the extraction of total phenols (TP) and total flavonoids (TF) from linden (Tilia cordata M.) flowers was performed using single-factor experiments. Experimental results showed that extraction conditions had a significant effect on the extraction of phenolic compounds. The optimized conditions were 50 % ethanol, liquid to solid ratio 60 mL g-1 for 120 min at 55 °C, with values of 17.05 mg GAE g-1 dry weight (d.w.) for TP and 13.32 mg CE g-1 d.w. for TF. Extracted phenolic compounds were analyzed by HPLC. The antioxidant activity of the extracts was evaluated by DPPH and ABTS assays. The applicability of different mathematical models (model based for the unsteady diffusion through the plant material, mo...
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2021
Background: The recovery of phenolic compounds is seen as an arduous task because phenolic compounds are available as free aglycones, as sugar or ester conjugates, or as polymers with several monomeric components. This study looks at the optimization of factors that affect the efficiency for the extraction of phenolic compounds from the stem-bark of Funtumia elastica. Methods: Five independent variables (solvent concentration, time, the temperature, solid-liquid ratio, and pH) of the extraction process were selected. Single factor analysis as well as the response surface method was used to evaluate the impact of the selected factors on the total phenolic content. The effect of the extraction factors on the phenolic content was tested for its statistical significant (p <0.05). For the response surface method, a five/factor, five/level central composite design was used, and a fitted second-order polynomial regression model equation was used to show how the extraction parameters aff...
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