Low-cost humic acid-bonded silica as an effective solid-phase extraction sorbent for convenient determination of aflatoxins in edible oils

Zhou, Neng-Zhi; Liu, Ping; Xiao-chuan, SU; Yan-hua, Liao; Lei, Ning-Sheng; Liu, Yonghong; Zhou, Shaohuan; Lin, Wensi; Chen, Jie; Feng, Yu‐Qi; Tang, Yang

doi:10.1016/j.aca.2017.02.029

Cited by 67 publications

(18 citation statements)

References 36 publications

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“…The physical entrapment of humic molecules into silica matrices provides a simple but effective route to obtain HA-SiO 2 composites with a high sorption capacity towards heavy metals cations [26] as well as organic hydrophobic contaminants [27]. Alternatively, chemical immobilization has been exploited to bind humic acids onto the silica surface [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Tuning Functional Behavior of Humic Acids through Interactions with Stöber Silica Nanoparticles

et al. 2020

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Humic acids (HA) exhibit fascinating multifunctional features, yet degradation phenomena as well as poor stability in aqueous environments strongly limit their use. Inorganic nanoparticles are emerging as a powerful interface for the development of robust HA bio-hybrid materials with enhanced chemical stability and tunable properties. Hybrid organic-inorganic SiO 2 /HA nanostructures were synthesized via an in-situ sol-gel route, exploiting both physical entrapment and chemical coupling. The latter was achieved through amide bond formation between carboxyl groups of HA and the amino group of 3-aminopropyltriethoxysilane (APTS), as confirmed by Fourier-Transform Infrared (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopy. Monodisperse hybrid nanoparticles about 90 nm in diameter were obtained in both cases, yet Electron Paramagnetic Resonance (EPR) spectroscopy highlighted the different supramolecular organization of HA. The altered HA conformation was reflected in different antioxidant properties of the conjugated nanoparticles that, however, resulted in being higher than for pure HA. Our findings proved the key role of both components in defining the morphology of the final system, as well as the efficacy of the ceramic component in templating the HA supramolecular organization and consequently tuning their functional features, thus defining a green strategy for bio-waste valorization.

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Section: Introductionmentioning

confidence: 99%

Tuning Functional Behavior of Humic Acids through Interactions with Stöber Silica Nanoparticles

et al. 2020

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“…The analytical performance of the proposed method was compared with that of some other reported methods for the determination of AFs in various matrices. It is evident from Table S1 (supporting information) that the present method shows wider linearity and shorter extraction time than the other methods.…”

Section: Resultsmentioning

confidence: 99%

Integrated in‐syringe magnetic sheet solid‐phase extraction and dispersive liquid–liquid microextraction for determination of aflatoxins in fresh and moldy breads

2019

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BACKGROUND: Magnetic three-dimensional graphene-based nanoadsorbents have unique characteristics such as large surface area, good thermal and chemical stability, and high adsorption capacity that make them efficient materials in sorbent-based extraction techniques. In this study, four aflatoxins (AFs) were analyzed in bread samples using magnetic three-dimensional graphene as the adsorbent phase in dispersive micro solid-phase extraction. RESULTS AND CONCLUSIONS: In-syringe magnetic sheet solid-phase extraction based on magnetic three-dimensional graphene in tandem with dispersive liquid-liquid microextraction was used for the extraction and preconcentration of the target AFs.The effect of significant parameters of the method was investigated and the optimum conditions were determined as follows: adsorbent dosage, 20 mg; desorption/disperser solvent (methanol) volume, 700 L; desorption solvent flow rate, 0.7 mL min −1 ; pH, neutral; salt (NaCl) concentration, 10% (w/v); extraction solvent (chloroform) volume, 250 L; and centrifugation rate (and time), 4000 rpm (5 min). The limits of detection and quantification were in the ranges 0.043-0.083 and 0.14-0.28 g kg −1 , respectively. The extraction method was followed by the HPLC technique with fluorescence detection and applied to the determination of the AFs in four different Iranian fresh and moldy bread samples. The relative recoveries were in the range 84-107% with relative standard deviations of 3.9-8.6%.

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“…Therefore, an appropriate pretreatment step is necessary to purify the sample and enrich for AFs. Liquid-liquid extraction (LLE) ( Afzali et al, 2012 ; Campone et al, 2011 ; Andrade et al, 2013 ), matrix solid-phase dispersion (MSPD) ( Alessandra et al, 2016 ), solid-phase extraction (SPE) ( Blesa et al, 2003 ; Alcaide-Molina et al, 2009 ; Luca et al, 2015 ; Zhou et al, 2017 ), quick easy cheap effective rugged and safe (QuEChERS) pretreatment ( Desmarchelier et al, 2014 ) and immunoaffinity column (IAC) methods ( Ma et al, 2013 ; Rhemrev et al, 2015 ; Wilcox et al, 2015 ; Xie et al, 2015 ) have been carried out for multi-matrix cleanup prior to analysis of AFs to eliminate matrix interference. Due to the high selectivity and efficiency, the introduction of IAC can overcome the shortcomings of non-specificity, solvent consumption, and poor efficiency of other cleanup techniques, which has been recommended by the Association of Official Analytical Chemists (AOAC) ( Rhemrev et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Development of an Ultrasonication-Assisted Extraction Based HPLC With a Fluorescence Method for Sensitive Determination of Aflatoxins in Highly Acidic Hibiscus sabdariffa

et al. 2018

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The high acidity and complex components of Hibiscus sabdariffa have provided major challenges for sensitive determination of trace aflatoxins. In this study, sample pretreatment of H. sabdariffa was systematically developed for sensitive high performance liquid chromatography-fluorescence detection (HPLC-FLD) after ultrasonication-assisted extraction, immunoaffinity column (IAC) clean-up and on-line post-column photochemical derivatization (PCD). Aflatoxins B1, B2, G1, G2 were extracted from samples by using methanol/water (70:30, v/v) with the addition of NaCl. The solutions were diluted 1:8 with 0.1 M phosphate buffer (pH 8.0) to negate the issues of high acidity and matrix interferences. The established method was validated with satisfactory linearity (R > 0.999), sensitivity (limits of detection (LODs) and limits of quantitation (LOQs) of 0.15–0.65 and 0.53–2.18 μg/kg, respectively), precision (RSD <11%), stability (RSD of 0.2–3.6%), and accuracy (recovery rates of 86.0–102.3%), which all met the stipulated analytical requirements. Analysis of 28 H. sabdariffa samples indicated that one sample incubated with Aspergillus flavus was positive with aflatoxin B1 (AFB1) at 3.11 μg/kg. The strategy developed in this study also has the potential to reliably extract and sensitively detect more mycotoxins in other complex acidic matrices, such as traditional Chinese medicines, foodstuffs, etc.

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Low-cost humic acid-bonded silica as an effective solid-phase extraction sorbent for convenient determination of aflatoxins in edible oils

Cited by 67 publications

References 36 publications

Tuning Functional Behavior of Humic Acids through Interactions with Stöber Silica Nanoparticles

Tuning Functional Behavior of Humic Acids through Interactions with Stöber Silica Nanoparticles

Integrated in‐syringe magnetic sheet solid‐phase extraction and dispersive liquid–liquid microextraction for determination of aflatoxins in fresh and moldy breads

Development of an Ultrasonication-Assisted Extraction Based HPLC With a Fluorescence Method for Sensitive Determination of Aflatoxins in Highly Acidic Hibiscus sabdariffa

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