Abstract
Aflatoxin (AFT) contamination, commonly in foods and grains with extremely low content while high toxicity, has caused serious economic and health problems worldwide. Now researchers are making an effort to develop nanomaterials with remarkable adsorption capacity for the identification, determination and regulation of AFT. Herein, we constructed a novel hollow-structured microporous organic networks (HMONs) material. On the basis of Fe3O4@MOF@MON, hydrofluoric acid (HF) was introduced to remove the transferable metal organic framework (MOF) to give hollow MON structures. Compared to the original Fe3O4@MOF@MON, HMON showed improved surface area and typical hollow cavities, thus increasing the adsorption capacity. More importantly, AFT is a hydrophobic substance, and our constructed HMON had a higher water contact angle, greatly enhancing the adsorption affinity. From that, the solid phase extraction (SPE-HPLC) method developed based on HMONs was applied to analyze four kinds of actual samples, with satisfied recoveries of 85–98%. This work provided a specific and sensitive method for the identification and determination of AFT in the food matrix and demonstrated the great potential of HMONs in the field of the identification and control of mycotoxins.
Highlights
Food is the basis of all human life activities
Compared with the existing methods for detecting AFT based on HPLC-SPE, the LODs of this method we reported were lower than average, indicating the hollow-structured microporous organic networks (HMONs)-SPE-HPLC is highly sensitive
A larger surface area was detected for HMONs compared with Fe3O4@metal organic framework (MOF)@microporous organic networks (MONs), which increased from 468.7 to 897.3 m2 g−1
Summary
Food is the basis of all human life activities. In recent years, the frequent occurrence of malignant events caused by food safety problems, especially the biotoxin residues in food, resulted in inestimable harm and loss [1]. With the rapid development of science and technology, functional micro-/nano-materials have gradually entered people’s vision, especially in the field of food safety [19,20,21,22,23,24]. Some porous morphologies, such as MOFs and microporous organic networks (MONs), are widely utilized in food sample pretreatment. A novel type of hybrid materials, Fe3O4@MOF@MON, was reported by Li et al in 2019 [23] It exhibited good magnetic separation ability, which effectively simplified pretreatment steps and could be applied. BBEETT aannaallyyssiiss ooff tthhee MMOONNss ((AA)) aanndd HHMMOONNss ((BB));; ((CC)) CCoommppaarriissoonn ooff tthhee ppaarrttiiccllee ssiizzee aanndd ssuurrffaaccee zzeettaapoptoetnetniatilaolfoMf OMNOsNansdaHndMOHNMsO; SNtrsu; cStutrruacl tsutarbalilistytaebvilaitluyaetivoanluoaf ttihoendoevf etlhoepeddeHveMloOpNeds HpmaMircirOsoosNnpshomef rtiehcserovpsiaoprhpeeavrretoislcuvlemiaseipzoaefr(tMDic)lOeaNsnidszeasn(uDdrf)aHacnMedaOrseNuarsfm.acoenaitroerainmgoantidtoifrfienrgenatt pdHiffe(Ere);n(tFp)HCo(Em)p; (aFr)isCoonmo-f the pore volume of MONs and HMONs
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