Ultrasound extracted flavonoids from four varieties of Portuguese red grape skins determined by reverse-phase high-performance liquid chromatography with electrochemical detection

Novak, Ivana; Janeiro, Patricia; Šeruga, Marijan; Oliveira-Brett, Ana Maria

doi:10.1016/j.aca.2008.10.002

Cited by 130 publications

(78 citation statements)

References 43 publications

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“…In effect, Tao et al [26] found that in the first 10-20 min of extraction the dissolution of the soluble components on the surfaces of the matrix occurs and it is at this stage that up to 90% of the recovery of the total content of the phenolic compounds can be achieved, thus indicating a considerable rapid extraction rate. Probably, the exposure of an ultrasonic irradiation of 30 min caused negative effects like oxidation, degradation, and/or polymerization of the phenolic and flavonoid compounds [27,28,29]. As consequence, the derived secondary compounds could not be estimated by Folin-Ciocalteu reagent assay that, according to several authors, is not specific only for phenols [30,31,32].…”

Section: Optimization Of Uae Timementioning

confidence: 99%

Study of the Efficacy of Two Extraction Techniques from Crithmum maritimum and Salicornia europaea

Costa¹,

Padalino²,

Spinelli³

et al. 2018

JFNR

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The aim of this work was to study the characteristics of the extracts from two halophytes, sea fennel (Crithmum maritimum L.) and marsh samphire (Salicornia europaea L.) that naturally grow on the Mediterranean coast, by using ultrasound-assisted extraction (UAE) and supercritical fluid extraction (SFE). Best conditions for UAE were found at temperature 50°C, 20 min extraction time, 1:30 ratio solid:solvent and 40% (v/v) ethanol concentration. For SFE best conditions were at 50°C and 300 bar pressures with 40% (v/v) ethanol concentration. Total extract yield, total phenolic content, total flavonoid content and antioxidant capacity of the extracts were measured. For both species the best results were obtained with UAE technique. Between the two halophytes, the C. maritimum extract was the richest one in antioxidant compounds (total phenol = 23.44 mg GAE s g dw -1); under the best conditions the S. europea extract allowed recording only 9.31 mg GAE s g dw -1 of total phenol.

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Section: Optimization Of Uae Timementioning

confidence: 99%

Study of the Efficacy of Two Extraction Techniques from Crithmum maritimum and Salicornia europaea

Costa¹,

Padalino²,

Spinelli³

et al. 2018

JFNR

View full text Add to dashboard Cite

show abstract

“…Many analytical methods have been described for determination of flavonols in wines. The most selective methods involve often liquid or gas chromatography coupled to detection by mass or tandem mass spectrometry [35][36][37][38][39][40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

A sensitive microextraction by packed sorbent-based methodology combined with ultra-high pressure liquid chromatography as a powerful technique for analysis of biologically active flavonols in wines

Silva

Gonçalves

Câmara

2012

Analytica Chimica Acta

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“…Up to now, several conventional extraction techniques have been used to extract flavonoids like hot water extraction [9], alkaline extraction [13], microwave-assisted extraction [14], supercritical fluid extraction accelerated solvent extraction [15], and ultrasonic-assisted extraction [16,17]. Among these, ultrasonic-assisted extraction has been successful and widely used owing to its high efficiency, time-saving, simplified manipulation, and is environmental-friendly [18,19].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Ultrasonic-Assisted Extraction of Flavonoid Compounds and Antioxidants from Alfalfa Using Response Surface Method

2015

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Ultrasonic-assisted extraction (UAE) was used to extract flavonoid-enriched antioxidants from alfalfa aerial part. Response surface methodology (RSM), based on a four-factor, five-level central composite design (CCD), was employed to obtain the optimal extraction parameters, in which the flavonoid content was maximum and the antioxidant activity of the extracts was strongest. Radical scavenging capacity of the extracts, which represents the amounts of antioxidants in alfalfa, was determined by using 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonicacid) (ABTS) and 2,2′-diphenyl-1-picrylhydrazyl (DPPH) methods. The results showed good fit with the proposed models for the total flavonoid extraction (R 2 = 0.9849), for the antioxidant extraction assayed by ABTS method (R 2 = 0.9764), and by DPPH method (R 2 = 0.9806). Optimized extraction conditions for total flavonoids was a ratio of liquid to solid of 57.16 mL/g, 62.33 °C, 57.08 min, and 52.14% ethanol. The optimal extraction parameters of extracts for the highest antioxidant activity by DPPH method was a ratio of liquid to solid 60.3 mL/g, 54.56 °C, 45.59 min, and 46.67% ethanol, and by ABTS assay was a ratio of liquid to solid 47.29 mL/g, 63.73 °C, 51.62 min, and 60% ethanol concentration. Our work offers optimal extraction conditions for total flavonoids and antioxidants from alfalfa.

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Ultrasound extracted flavonoids from four varieties of Portuguese red grape skins determined by reverse-phase high-performance liquid chromatography with electrochemical detection

Cited by 130 publications

References 43 publications

Study of the Efficacy of Two Extraction Techniques from <i>Crithmum maritimum</i> and<i> Salicornia europaea</i>

Study of the Efficacy of Two Extraction Techniques from <i>Crithmum maritimum</i> and<i> Salicornia europaea</i>

A sensitive microextraction by packed sorbent-based methodology combined with ultra-high pressure liquid chromatography as a powerful technique for analysis of biologically active flavonols in wines

Optimization of Ultrasonic-Assisted Extraction of Flavonoid Compounds and Antioxidants from Alfalfa Using Response Surface Method

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