Critical analysis of research trends and issues in microwave assisted extraction of phenolics: Have we really done enough

Kala, Harneet Kaur; Mehta, Rajendra; Sen, Kamal; Tandey, Roshni; Mandal, Vivekananda

doi:10.1016/j.trac.2016.09.007

Cited by 101 publications

(45 citation statements)

References 68 publications

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“…The basic concept of the preliminary experiments, for MAE and UAE systems, is to assure that the experimental domain of the operating conditions, for the optimization procedure, will be properly defined to maximize the responses (Kala et al, 2016;Tiwari, 2015). It is well known that several variables can affect the extraction of compounds from natural sources (Bhuyan et al, 2015;Dahmoune et al, 2015;Routray and Orsat, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Water mixtures with polar solvents such as methanol, ethanol, acetone, among others, are the most commonly used in the extractions of natural compounds from plants (Prieto and Vázquez, 2014). Aqueous mixtures are preferable due to the range of the polarity degrees associated with the molecules to be extracted; it increases the microwave/ultrasound extraction efficiency, also allowing a better heat dissipation (Kala et al, 2016). In this sense, considering the principles of green chemistry, binary mixtures ethanol:water were selected as the extraction solvent.…”

Section: Resultsmentioning

confidence: 99%

“…It is well know that the contact surface of the sample with the extraction solvent will influences the efficiency of the extraction process (Kala et al, 2016;Tiwari, 2015). Lower S/L ratios can facilitate the extraction process, but generates a high waste of solvent (10-30 g/mL, Maran et al, 2015;Thirugnanasambandham and Sivakumar, 2015), demanding its recovery and recycling.…”

Section: Resultsmentioning

confidence: 99%

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Modern extraction techniques optimized to extract betacyanins from Gomphrena globosa L.

Roriz

Barros

Prieto

et al. 2017

Industrial Crops and Products

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A B S T R A C TGomphrena globosa L. is a source of betacyanins, molecules with high colorant power. In order to replace conventional extraction techniques, microwave (MAE) and ultrasound assisted extraction (UAE) processes were optimized by the response surface methodology (RSM) to maximize the recovery of betacyanins from G. globosa. A five-level full factorial design of 24 combinations and 4 replicates was implemented for MAE and UAE. The optimum processing conditions for MAE (t = 8 min; T = 60°C; Et = 0%; and S/L = 5 g/L) conducted to an extraction yield of 39.6 ± 1.8 mg/g dry weight, while for UAE (t = 22 min; P = 500%; Et = 0%; and S/ L = 5 g/L) a value of 46.9 ± 4.8 mg/g was achieved, validating the UAE more suitable to obtain the target compounds. This technique can provide extracts rich in betacyanins and with high potential to be used as natural colorants.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Modern extraction techniques optimized to extract betacyanins from Gomphrena globosa L.

Roriz

Barros

Prieto

et al. 2017

Industrial Crops and Products

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“…MAE is also frequently used for extraction of active compounds from vegetal raw materials (Albuquerque et al, 2017;Kala, Mehta, Sen, Tandey, & Mandal, 2016;Zekovi c et al, 2017). In this technique the extraction process is influenced by the solubility of the active compounds in the solvent, partition coefficient, and diffusion.…”

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confidence: 99%

Optimization of ultrasound and microwave assisted oil extraction from sea buckthorn seeds by response surface methodology

Isopencu

Stroescu

Brosteanu

et al. 2018

J Food Process Engineering

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Sea buckthorn (SB) seeds were used as raw material to obtain SB oil using two extraction methods: ultrasound and microwave assisted extraction. The favorable experimental conditions that maximize the extraction efficiency were investigated by applying response surface methodology (RSM). The selected key independent variables were ultrasonic intensity (UI), temperature, and time for ultrasound assisted extraction (UAE) and microwave power, time, and solid/liquid ratio for microwave assisted extraction (MAE). The results obtained for extraction efficiency under optimal conditions are comparable for the two extraction methods (89.2 ± 0.50% for MAE and 87.4 ± 0.44% for UAE). The operation conditions for maximum extraction efficiency were: 13.77 W/cm2 UI, 40 °C temperature, and 10 min extraction time for UAE and 225 W microwave power, 15 ml/ g solid/liquid ratio, and 20 min extraction time for MAE. The extraction kinetics was characterized using a second order model for optimal conditions for UAE and MAE of SB seed oil. Practical applications This article describes two modern methods of sea buckthorn seed oil extraction: ultrasound assisted extraction (UAE) and microwave assisted extraction. Both methods offer many advantages if they are likened with conventional oil extraction. The results illustrated that both methods give comparable values for extraction efficiency, but with an advantage for UAE. The extraction time for UAE is shorter in comparison with MAE (10 min in comparison with 20 min).

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“…Studies on extraction of natural antioxidants proved that the ethanol-water mixtures are suited to penetrate the hydrophobic areas of the vegetal matrix facilitating further extraction processes [16,17]. Methods used for extracting phenolic compounds include both conventional techniques (maceration, reflux) and alternative one using high pressure solvents or the benefits of ultrasounds or microwaves [12,18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of different extraction techniques for the evaluation of polyphenols content in Summer savory extracts

Casoni¹,

Oláh²,

Soran³

et al. 2017

Studia UBB Chemia

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ABSTRACT. Efficiency of conventional solvent extraction (maceration and normal refluxing) and novel extraction techniques (ultrasound-assisted extraction-UAE and microwave-assisted extraction-MAE) were compared in order to obtain an enhanced content of total flavonoid, total phenolic compounds and rosmarinic acid from the Satureja hortensis L. (Summer savory) herb. Different mixtures of ethanol-water ratio were used for extraction of these compounds from dry plant material. High level of total flavonoid content was determined for a solvent system consisted of 40% respectively 50% ethanol (extraction systems ES6 and ES5) while the most efficient techniques were normal refluxing (R) and ultrasound-assisted extraction when sweep mode (UAE1) was selected. For the same solvent systems (ES6 and ES5), a high content of total phenolic compounds was determined when the normal refluxing (R) and microwave-assisted extraction (MAE1, with a duty coefficient of 40% and microwave action time1 min) were used for the extraction procedure. For the rosmarinic acid extraction, the maceration technique (M) combined with an ethanol-water system consisted of 60% ethanol (ES4) was found as the most efficient procedure.

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Critical analysis of research trends and issues in microwave assisted extraction of phenolics: Have we really done enough

Cited by 101 publications

References 68 publications

Modern extraction techniques optimized to extract betacyanins from Gomphrena globosa L.

Modern extraction techniques optimized to extract betacyanins from Gomphrena globosa L.

Optimization of ultrasound and microwave assisted oil extraction from sea buckthorn seeds by response surface methodology

Comparison of different extraction techniques for the evaluation of polyphenols content in Summer savory extracts

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