Extraction optimisation using water/glycerol for the efficient recovery of polyphenolic antioxidants from two Artemisia species

Shehata, Emad; Grigorakis, Spyros; Loupassaki, Sofia; Makris, Dimitris P.

doi:10.1016/j.seppur.2015.06.017

Cited by 68 publications

(38 citation statements)

References 50 publications

(67 reference statements)

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“…26 The FRAP of the extracts was calculated from the regression equation of calibration curve (Y = 0.001x; R 2 = 0.995) and the results were expressed as μmol ascorbic acid equivalents (μmol AAE per g −1 dw) through the calibration curve of ascorbic acid (30-220 μmol). 27 An aliquot of 0.025 mL sample was mixed thoroughly with 0.975 mL DPPH solution (100 μM in methanol) and then shaken vigorously. The absorbance at 515 nm was read immediately (A515(i)).…”

Section: Determination Of Ferric Reducing Antioxidant Power (Frap)mentioning

confidence: 99%

Deep eutectic solvent‐based extraction of polyphenolic antioxidants from onion (Allium cepa L.) peel

2018

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BACKGROUND Biomass waste, including fruit and vegetable residues, poses a serious challenge to the environment. This demands novel approaches for handling and disposing of it in a safe manner. However, such waste is extremely rich in bioactive components, which are considered to have a beneficial impact on health. This has led to the recovery of high‐value compounds from biomass waste before finally disposing of it. The present investigation reveals the use of green solvents such as eutectic mixtures composed of choline chloride with three different hydrogen bond donors like sucrose (4:1), urea (1:2), and sorbitol (3:1) as extractants for recovering valuable phenolic antioxidants from onion peel. RESULTS A deep eutectic solvent system consisting of choline chloride:urea (ChCl:urea) showed the best result for total phenolic content from onion peel while the other two eutectic mixtures showed relatively lower extraction efficiency. Experiments were performed with different molar ratios of ChCl:U (1:1–1:3) and liquid–solid ratios (10:1–60:1) under a temperature range (50–90 °C) and a time range (60–150 min). Taguchi's method was employed to maximize the extraction of polyphenolic antioxidants from onion peel, resulting in optimal conditions: extraction temperature 60 °C, time 120 min, liquid to solid ratio 50:1 and molar ratio of ChCl:U as 1:2. Under optimum conditions, the corresponding TPC value of the extract was found to be highest at 222.97 mg gallic acid equivalent (GAE) g−1 dw. CONCLUSION Major flavonoids – quercetin, kaempferol, and myricetin – were identified and quantified in the extracts. Moreover, high reducing power (PR) value was reported in the case of ChCl:U extract, and 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) radical scavenging activity was found to be higher in ChCl:So extract. © 2018 Society of Chemical Industry

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Section: Determination Of Ferric Reducing Antioxidant Power (Frap)mentioning

confidence: 99%

Deep eutectic solvent‐based extraction of polyphenolic antioxidants from onion (Allium cepa L.) peel

2018

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“…All the LTTMs were used as 70% (v/v) aqueous solutions because water regulates (i) the polarity of the LTTM, providing, in general, higher extraction yields [11], and (ii) the viscosity of the LTTM, allowing for higher diffusivity. Since solid-liquid extraction is governed by diffusion, increased diffusivity results in a shorter time during which the maximum extraction yield can be achieved [20,21].…”

Section: Lttm Synthesismentioning

confidence: 99%

Low-Transition Temperature Mixtures (LTTMs) Made of Bioorganic Molecules: Enhanced Extraction of Antioxidant Phenolics from Industrial Cereal Solid Wastes

2017

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Several low-transition temperature mixtures (LTTMs), based on L-lactic acid and amino acids but also choline chloride, were synthesized and screened for their effectiveness in extracting antioxidant phenolics from industrial cereal solid wastes. In most cases, highly efficient LTTMs were those composed of L-lactic acid and choline chloride, but LTTMs composed of L-lactic acid and glycine or alanine also exhibited comparable extraction capacity. The extract from barley bran was shown to express powerful antioxidant activity, which was significantly higher than all the other extracts examined. This fact was attributed to the particularly high content in total flavanols. The data suggested that the most effective solvents, as revealed herein, merit further investigation as very promising means of extracting valuable chemicals from industrial agri-food residues. Additionally, barley bran should be more thoroughly examined for its prospect as a waste source of effective antioxidants, which could be used as nutritional supplements and active cosmetic ingredients.

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“…Reducing power (P R ) was estimated using the TPTZ methodology [15] and results were expressed as ascorbic acid equivalents (mM AAE). The antiradical activity (A AR ) was measured with the DPPH probe, as described previously [16].…”

Section: Sampling and Determinationsmentioning

confidence: 99%

Accelerated Aging of the Traditional Greek Distillate Tsipouro Using Wooden Chips. Part I: Effect of Static Maceration vs. Ultrasonication on the Polyphenol Extraction and Antioxidant Activity

Taloumi

Makris

2017

Beverages

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Abstract:The Greek traditional grape marc distillate Tsipouro was subjected to accelerated aging, using wooden chips from acacia, cherry, chestnut and oak wood. The processes included treatments under static maceration and ultrasonication and the evolution of the total polyphenol concentration was monitored over a period of 30 days. During this period, leaching of polyphenols from the chips into the distillate was found to obey first-order kinetics, but no statistical differences were shown between the two treatments regarding the enrichment of the liquid in polyphenolic substances. The determination of the antioxidant activity demonstrated that aging with chestnut chips may provide Tsipouro with particularly strong radical scavenging and reducing effects, highlighting its importance as a material that could be used to turn distillates into foods with functional properties.

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Extraction optimisation using water/glycerol for the efficient recovery of polyphenolic antioxidants from two Artemisia species

Cited by 68 publications

References 50 publications

Deep eutectic solvent‐based extraction of polyphenolic antioxidants from onion (Allium cepa L.) peel

Deep eutectic solvent‐based extraction of polyphenolic antioxidants from onion (Allium cepa L.) peel

Low-Transition Temperature Mixtures (LTTMs) Made of Bioorganic Molecules: Enhanced Extraction of Antioxidant Phenolics from Industrial Cereal Solid Wastes

Accelerated Aging of the Traditional Greek Distillate Tsipouro Using Wooden Chips. Part I: Effect of Static Maceration vs. Ultrasonication on the Polyphenol Extraction and Antioxidant Activity

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