Comparisons of Microwave-Assisted Extraction, Simultaneous Distillation-Solvent Extraction, Soxhlet Extraction and Ultrasound Probe for Polycyclic Musks in Sediments: Recovery, Repeatability, Matrix Effects and Bioavailability

Hu, Xiangang; Zhou, Qixing

doi:10.1007/s10337-011-2084-5

Cited by 28 publications

(12 citation statements)

References 34 publications

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“…The choice of solvent must take into account not only the ainity to the target phytochemicals but also the ability to absorb microwave energy [81]. For example, solvents like hexane or dichloromethane, which are transparent to microwaves, do not heat up under microwave [82,83]; thus, they should not be used in this system. Others, such as ethanol, methanol, or even water, have good microwave absorbing capacity [83], and they get heated up faster; thus, the length of the time and microwave power must be adapted to the solvent to enhance the extraction process without any deleterious efect on thermolabile components.…”

Section: Grape Residues (Vitis Vinifera)mentioning

confidence: 99%

Phenolics in Foods: Extraction, Analysis and Measurements

Aires¹

2017

Phenolic Compounds - Natural Sources, Importance and Applications

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The increasing consumers demands to acquire healthier fruits and vegetables as well as the urgency in looking to natural compounds with antioxidant activity and enhanced antimicrobial activity against antibiotic-resistant pathogenic bacterial strains have encouraged a quick expansion of research studies about enhanced phenolic extraction and identiication methods. Considering the importance of phenolics as natural compounds with antioxidant and antimicrobial activity, this chapter aims to present the most updated information about extraction methods, ranging from the traditional to the most advanced processes, as well as the access to the modern methods used in the identiication and quantiication of phenolics. The main goal of this chapter is to provide the reader with a broad view on the diferent protocols used to extract, identify and quantify phenolic compounds from diferent kinds of foods, including fruits and vegetables.Keywords: phytochemicals, extraction, determination, colorimetric methods, HPLC, HPLC-MS IntroductionThe growing resistance of pathogenic bacterial isolates against the traditional chemical antibiotics as well as the resurgent of old disappeared diseases associated with the constant consumers' demanding of healthier, nutritious and safe food has led the researchers to focus on searching for new, safe and efective molecules. One class of such molecules is the class of polyphenols. Polyphenols are a ubiquitous class of compounds largely present in plants as their secondary metabolites, which are synthesized during their normal development [1] in response to several stressful biotic and abiotic factors [2,3]. This class of compounds are a much diversiied group derived from the amino acids phenylalanine and tyrosine and The results from the last decade's research have shown that polyphenols have important beneicial properties for human health, including antioxidative, antiaging, antibacterial and antimutagenic [7][8][9][10][11]. Moreover, the recent evidence of their interaction with proteins, DNA and other biological molecules has enhanced their exploitation for the production of new natural product-derived therapeutic agents. Despite these advantages, several limitations still persist, particularly those related with their extraction eiciency, which afects the large-scale use of some of these substances. The diiculties in screening, extracting, separation and purifying these compounds have increased the development of new and modern methods to address these limitations. In this context, the aim of this chapter is to present an updated review about sources, technologies and methods that have been developed until now to improve the extraction, detection, separation and full characterization of such beneicial compounds, with special emphasis to their possible application in the design of nutraceuticals and functional food products. Foods as natural resources of phenolicsPolyphenols have been exhaustively studied in their diferent natural matrices such as fruits, vegetables, teas, algae a...

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Section: Grape Residues (Vitis Vinifera)mentioning

confidence: 99%

Phenolics in Foods: Extraction, Analysis and Measurements

Aires¹

2017

Phenolic Compounds - Natural Sources, Importance and Applications

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“…13 For the preparation of solid samples, there are traditional extraction techniques such as mechanical agitation and extraction by Soxhlet. 11 Alternatives techniques have been studied to improve the performance of extraction of analytes, such as pressurized liquid extraction (PLE), 27,28 also known as accelerated solvent extraction (ASE), 29,30 microwave assisted extraction (MAE) 31,32 and ultrasound assisted extraction (UAE). [33][34][35] Solid phase extraction (SPE) technique has been chosen for purification of extracts due to its efficiency and availability of phases.…”

Section: Introductionmentioning

confidence: 99%

Aqueous Ultrasound-Assisted Extraction for the Determination of Fluoroquinolones in Mangrove Sediment by High-Performance Liquid Chromatography and Fluorescence Detector

Neves¹,

Silva²,

Brito³

et al. 2017

J. Braz. Chem. Soc.

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A method for simultaneous analysis of ciprofloxacin (CIP), levofloxacin (LEV) and norfloxacin (NOR) in mangrove sediment was developed using aqueous ultrasound-assisted extraction (UAE), solid phase extraction (SPE) and high-performance liquid chromatography with fluorescence detection (HPLC-FD). The method showed excellent linear correlation coefficient for the three fluoroquinolones (r 2 > 0.999) using external calibration curve and good recovery in real sediment samples ranging from 73.73 to 88.85%. The precision showed a relative standard deviation lower than 20% and detection limits of 1.10, 3.33 and 0.26 µg kg -1 to CIP, LEV and NOR, respectively. There was no presence of interfering. After validation, the method was applied in the determination of pharmaceuticals in mangrove sediment in the Paciência River, Maranhão Island, Brazil. Only the CIP antibiotic was found in three of six samples analyzed, with values ranging 56.55-70.45 µg kg -1 .

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“…The leastsquares linear regression analysis showed good linearity within the concentration range from LOQ to 2000 μg kg −1 in the matrix with correlation coefficients (r 2 ) higher than 0.99 for these tested compounds. The LODs ranged from 1.8 to 18.0 μg kg −1 , which were much below the reported concentrations in manure and the maximum residue limits (MRLs) in muscle [4,5]. The intra-day and inter-day RSDs ranged from 0.6 to 7.8 %, suggesting good reproducibility of the fully automatic online SPE protocol.…”

Section: Methods Validationmentioning

confidence: 64%

“…Various methods have been developed to analyze veterinary drug residues in animal tissues [4], animal manure [5] and soil [6]. The procedure of the analytical methodology usually consists of extracting antibiotics from sludge/bio-solid, cleaning up extracts and analyzing with liquid or gas chromatography.…”

Section: Introductionmentioning

confidence: 99%