Preconcentration of some metal ions with lanthanum-8-hydroxyquinoline co-precipitation system

Protein hydrolysates from two forms of salmon frames named “chunk” and “mince” were produced and characterized. Both samples were subjected to hydrolysis using alcalase and papain at 1%–3% (w/w protein) for 0–240 min. Hydrolysate prepared with either protease at 3% for 180 min had the solid yield of 24.05%–26.39%. Hydrolysates contained 79.20%–82.01% proteins, 6.03%–6.34% fat, 9.81%–11.09% ash, and 4.02%–5.80% moisture. Amino acid profile showed that all hydrolysates had glutamic acid/glutamine (113.45–117.56 mg/g sample), glycine (77.86–86.18 mg/g sample), aspartic acid/asparagine (76.04–78.67 mg/g sample), lysine (61.97–65.99 mg/g sample), and leucine (54.30–57.31 mg/g sample) as the predominant amino acids. The size distributions determined by gel filtration chromatography varied, depending on proteases and the form of frame used for the hydrolysis. Different hydrolysates showed varying antioxidant capacities. Thus, protein hydrolysates from salmon frame could be used as a nutritive supplement in the protein deficient foods. Practical applications Frames of salmon are by‐products from salmon fish processing industries. The frames contained the remaining meat, hence they can be used for the preparation of protein hydrolysates. Generally, hydrolysates from fish by‐products have been regarded as a promising food supplement, because they are rich in amino acids. Additionally, hydrolysates possess antioxidant activity, which is of health benefit. To produce the hydrolysate with less time consumption, the use of frame chunk instead of minced frame can be of better choice. Thus, frame of salmon, especially in chunk form, could be used as a raw material for production of protein hydrolysate using alcalase. The hydrolysate produced from salmon frame could serve as an alternative nutritive supplement to tackle the nutrition inadequacies in foods.

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“…Minerals were determined using the inductively coupled plasma optical emission spectrometer (ICP-OES) as tailored by Feist and Mikula (2014).…”

Section: Determination Of Mineralsmentioning

confidence: 99%

Protein hydrolysate from salmon frames: Production, characteristics and antioxidative activity

et al. 2018

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“…A comparison of the proposed co-precipitation procedure in this study with the other reported preconcentration methods for cadmium, nickel, chromium, lead and cobalt ions extraction from water samples are shown in Table 4 (Bulut et al 2010;Feist and Mikula 2014;Soylak and Aydin 2011;Soylak et al 2007Soylak et al , 2008Tuzen and Soylak 2009). Using similar precipitate dissolving media (HNO 3 ), the coprecipitation procedure for metal ions with 8-hydoxyquinoline as a ligand yielded low precipitation factor (PF) compared to those reported in the literatures for which other ligands were used (Table 4).…”

Section: Effect Of Interference Ions On Metal Recoverymentioning

confidence: 99%

Flame atomic absorption spectrometric determination of heavy metals in aqueous solution and surface water preceded by co-precipitation procedure with copper(II) 8-hydroxyquinoline

Ipeaiyeda

Ayoade

2017

Appl Water Sci

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Co-precipitation procedure has widely been employed for preconcentration and separation of metal ions from the matrices of environmental samples. This is simply due to its simplicity, low consumption of separating solvent and short duration for analysis. Various organic ligands have been used for this purpose. However, there is dearth of information on the application of 8-hydroxyquinoline (8-HQ) as ligand and Cu(II) as carrier element. The use of Cu(II) is desirable because there is no contamination and background adsorption interference. Therefore, the objective of this study was to use 8-HQ in the presence of Cu(II) for coprecipitation of Cd(II), Co(II), Cr(III), Ni(II) and Pb(II) from standard solutions and surface water prior to their determinations by flame atomic absorption spectrometry (FAAS). The effects of pH, sample volume, amount of 8-HQ and Cu(II) and interfering ions on the recoveries of metal ions from standard solutions were monitored using FAAS. The water samples were treated with 8-HQ under the optimum experimental conditions and metal concentrations were determined by FAAS. The metal concentrations in water samples not treated with 8-HQ were also determined. The optimum recovery values for metal ions were higher than 85.0%. The concentrations (mg/L) of Co(II), Ni(II), Cr(III), and Pb(II) in water samples treated with 8-HQ were 0.014 ± 0.002, 0.03 ± 0.01, 0.04 ± 0.02 and 0.05 ± 0.02, respectively. These concentrations and those obtained without coprecipitation technique were significantly different. Coprecipitation procedure using 8-HQ as ligand and Cu(II) as carrier element enhanced the preconcentration and separation of metal ions from the matrix of water sample.

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“…For this purpose, especially for determining low concentrations, a separation or preconcentration technique is required. There are several separation/ preconcentration techniques for removal or detection of heavy metals; solid-phase extraction (SPE), [1,[6][7][8] liquid-liquid extraction, [9,10] ion-exchange, [11][12][13] co-precipitation, [14,15] electrochemical deposition, [16] cloud point extraction, [17,18] membrane filtration, [19,20] and flotation. [21,22] Solid phase extraction (SPE) is the most used technique due to its many advantages such as lower solvent use, low disposal costs, short extraction times, high efficiency, being safe for the environment, using less glassware, isolation of analytes from large sample volumes resulting with less or minimal evaporation losses, reduced exposure of the researchers to organic solvents and more consistent results over other separation techniques.…”

Section: Introductionmentioning

confidence: 99%

Selective Preconcentration of Trace Amounts of Cu(II) With Surface‐Imprinted Multiwalled Carbon Nanotubes

Turan

Canlıdinç

Kalfa

2017

CLEAN Soil Air Water

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In this study, a new sorbent is synthesized using surface imprinting technique. Cu(II)-imprinted multiwalled carbon nanotube sorbent (Cu(II)-IMWCNT) is used as the solid phase in the solid-phase extraction method. After the preconcentration procedure, Cu(II) ions are determined by high-resolution continuum source atomic absorption spectrometry. A total of 0.1 mol L À1 ethylenediaminetetraacetic acid (EDTA) is used to remove Cu(II) ions from the sorbent surface. The optimum experimental conditions for effective preconcentration of Cu(II), parameters such as pH, eluent type and concentration, flow rate, sample volume, sorbent capacity, and selectivity are investigated. The synthesized solid phase is characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The maximum adsorption capacities of Cu(II)-IMWCNT and non-imprinted solid phases are 270.3 and 14.3 mg g À1 at pH 5, respectively. Under optimum experimental conditions for Cu(II) ions, the limit of detection is 0.07 μg L À1 and preconcentration factor is 40. In addition, it is determined to be reusable without significant decrease in recovery values up to 100 adsorption-desorption cycles. Cu(II)-IMWCNT have a high stability. To check the accuracy of the developed method, certified reference materials, and water samples are analyzed with satisfactory analytical results.

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Preconcentration of some metal ions with lanthanum-8-hydroxyquinoline co-precipitation system

Cited by 39 publications

References 21 publications

Protein hydrolysate from salmon frames: Production, characteristics and antioxidative activity

Protein hydrolysate from salmon frames: Production, characteristics and antioxidative activity

Flame atomic absorption spectrometric determination of heavy metals in aqueous solution and surface water preceded by co-precipitation procedure with copper(II) 8-hydroxyquinoline

Selective Preconcentration of Trace Amounts of Cu(II) With Surface‐Imprinted Multiwalled Carbon Nanotubes

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