Ultrasonic extraction combined with fast furnace analysis as an improved methodology for total selenium determination in seafood by electrothermal-atomic absorption spectrometry

Méndez, Hortensia; Alava, Fausto; Lavilla, Isela; Bendicho, Carlos

doi:10.1016/s0003-2670(01)01475-1

Cited by 45 publications

(23 citation statements)

References 21 publications

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“…Ultrasound-assisted extraction uses high-frequency sound to disrupt the target compound from the plant materials. Recently, there have been several reports on the application of ultrasonic methods in the extraction of various phytochemicals (Me´ndez et al 2002;Hromadkov & Ebringerov 2003). Microwave-assisted extraction of biologically active compounds has many advantages over other extraction methods such as shortened extraction time and lower consumption of solvents.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Techniques for the Extraction of Flavonoids from Cultured Cells of Saussurea medusa Maxim

Gao

Liu

2005

World J Microbiol Biotechnol

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Room temperature, heat reflux, Soxhlet, ultrasound-assisted and microwave-assisted extractions were employed to extract flavonoids from dry cell cultures of Saussurea medusa Maxim. 24, 20, 6, 0.5 and 0.1 h exposures were necessary for room temperature, Soxhlet, heat reflux, ultrasound-assisted and microwave-assisted extractions to obtain the maximum yield of flavonoids of 3.0%, 4.1%, 3.9%, 3.5% and 4.1%, respectively. Microwave-assisted extraction showed obvious advantages in short duration and high efficiency to extract flavonoids from S. medusa cultured cells.

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Section: Introductionmentioning

confidence: 99%

Comparison of Techniques for the Extraction of Flavonoids from Cultured Cells of Saussurea medusa Maxim

Gao

Liu

2005

World J Microbiol Biotechnol

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“…It is interesting that cathodic stripping voltammetry in the square wave mode (SQWCSV) gave about two times higher current peaks for each of the two organoselenium compounds in comparison with the differential pulse mode, which is normally used in the literature for the voltammetric determination of Se(IV) [17,18,19,30,31]. The effect of increasing the drop size is more substantial for the determination of Se-U.…”

Section: Resultsmentioning

confidence: 99%

“…The analytical techniques used for the determination of total selenium content of a sample include instrumental neutron activation analysis (INAA) [16], hydride generation atomic absorption spectrometry (HG-AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), electrothermal atomic emission spectrometry (ET-AAS), and differential pulse cathodic stripping voltammetry (DPCSV) after appropriate digestion of the sample [17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Separation of organoselenium compounds and their electrochemical detection

Ochsenkühn-Petropoulou

Tsopelas

2004

Anal Bioanal Chem

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A simplified procedure based on ion-exchange separation of selenourea (Se-U) and selenocystamine (Se-CM), which have very close half-wave potential when they are simultaneously analyzed by voltammetric techniques, has been developed and optimized. Thus, selenocystamine remains in the cation exchanger Purolite C 100 H, whereas selenourea is found in the effluent and is determined by square wave cathodic stripping voltammetry using Na(2)CO(3 )as electrolyte. Selenocystamine is then eluted from the cation exchanger using 4 M HCl and analyzed by square wave cathodic stripping voltammetry in the HCl solution. For each voltammetric determination the corresponding parameters were investigated and optimized; the obtained detection limits were 0.3 ng Se mL(-1) for Se-CM and 2 ng Se mL(-1) for Se-U. A flow sheet for the separation of inorganic (Se(IV) and Se(VI)) and organoselenium compounds (Se-U, Se-CM, (CH(3))(2)Se(2), and (CH(3))(2)Se) developed for their electrochemical detection is presented and it was successfully applied to a certified reference material, an environmental soil sample, and a urine sample.

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“…Ultrasound-assisted extractions of metals from environmental [5][6][7][8][9][10], biological [11][12][13], and food [14,15] samples have been successfully performed using ultrasonic baths. Remarkable increases of efficiency and consequent reductions of time were obtained for US-assisted extractions employing ultrasonic horns [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 97%

Ultrasound assisted pseudo-digestion for determination of iron and manganese in citric acid fermentation mediums by electrothermal atomic absorption spectroscopy

Pourhossein¹,

Madani²,

Shahlaei³

et al. 2009

Open Chemistry

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A sensitive, simple and rapid method for ultra-trace determination of iron and manganese based on ultrasound assisted pseudodigestion in citric acid fermentation medium samples (beet and cane molasses and raw sugar based mediums) is described. Parameters influencing pseudo-digestion, such as sonication time, sample mass and solvent system were fully optimized. Final solutions obtained upon sonication were analyzed by electrothermal atomic absorption spectrometry (ETAAS). The best conditions for metal pseudo-digestion were as follows: a 25, 30 and 20 min sonication time for beet molasses, cane molasses and raw sugar based medium samples, respectively, 0.7 g sample mass of raw sugar based samples, 0.5 g sample mass of molasses based samples and an extraction mixture of concentrated HNO 3 -H 2 O 2 , in 25 mL of solvent. Analytical results obtained for the two metals by ultrasound assisted pseudo-digestion and conventional wet digestion methods showed a good agreement. This method reduces the time required for all treatments (heating to dryness, cooling and separation) in comparison with conventional wet digestion method. The accuracy of the method was tested by comparing the obtained results with that of conventional wet digestion method.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Ultrasonic extraction combined with fast furnace analysis as an improved methodology for total selenium determination in seafood by electrothermal-atomic absorption spectrometry

Cited by 45 publications

References 21 publications

Comparison of Techniques for the Extraction of Flavonoids from Cultured Cells of Saussurea medusa Maxim

Comparison of Techniques for the Extraction of Flavonoids from Cultured Cells of Saussurea medusa Maxim

Separation of organoselenium compounds and their electrochemical detection

Ultrasound assisted pseudo-digestion for determination of iron and manganese in citric acid fermentation mediums by electrothermal atomic absorption spectroscopy

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