期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 241, 期 -, 页码 19-32出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.10.013
关键词
Combinatorial chemistry; Iron; Hydrogel; Ligands; Colorimetric; Sensor; Water quality
资金
- PRIS Nanopymes (EU-MCTIP(AR))
- FAN
- CONICET (PIP)
- SPU (Programa Amilcar Herrera)
- PDTS-CIN-CONICET
- SeCyT-UNRC (PPI- Programa Nanomateriales)
- EU [318903]
A combinatorial library of hydrogels is produced by radical polymerization and tested for retention of iron (II) complexes, using a simple colorimetric high throughput screening (HTS). Six acrylamide monomers are used to produce a library of 21 cross-linked hydrogel matrixes. The swelling of all hydrogels is determined and related with the structure of each monomer unit present. The HTS shows that some materials are able to retain the tris(phenanthroline)iron(II) (Fe(Phen)(3)(2+)) complex. The partition coefficient of Fe(H2O)(6)(2+) and Fe(Phen)(3)(2+) in all hydrogels is determined by UV-vis spectrophotometry and related with the presence of anionic (e.g. -SO3-, hydrophobic (e.g. isopropyl) and hydrophilic (e.g. -NH2 of acrylamide) groups. Hydrogels with sulfonic (-SO3-) groups show large values of partition coefficients of Fe2+ into the hydrogel (>500). Based on the data and HTS, poly(acrylamide-co-50%(2-acrylamido-2-methylpropansulfonic acid)) (PAAm-co-50%AMPS) is selected to build a colorimetric sensor. Since the phenanthroline could be released from the hydrogel, bathophenanthroline (BPhen) which is not released is used as ligand. The hydrogel is loaded with BPhen and exposed to Fe2+ in water. The visual detection of color gives a detection limit of 0.1 ppm. Little interference of different common ions is found. A special set-up is made which allows spectrophotometric measurement of the complex inside the gel. The detection limit is found to be of ca. 0.01 ppm by spectrophotometry. Using the sensor, the iron content in milk is measured directly demonstrating the use of the sensor to measure free iron in opaque liquids where solution spectrophotometry is not effective without complex sample pretreatments. The non-covalent retention of ligands and complexes inside polymeric hydrogels seems to be a suitable method for building specific ion sensors. (C) 2016 Elsevier BM. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据