Thermal Lens Spectrometric Determination of Colloidal and Ionic Silver in Water

Korte, Dorota; Bruzzoniti, Maria Concetta; Sarzanini, Corrado; Franko, Mladen

doi:10.1007/s10765-010-0856-z

Cited by 14 publications

(12 citation statements)

References 20 publications

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“…The same instrumental setup was also employed for FIA determination of Cr(VI), based on reaction with diphenylcarbazide, 287 and with a krypton laser as the excitation beam source for FIA determination of colloidal and ionic silver in drinking water, which is supplied to the International Space Station, and colloidal silver is used as disinfection agent. 288 Determination is based on a light absorption with a maximum close to 400 nm, but as it was shown in a later work, this determination can be affected by the presence of other ions, and should by further optimized. 289 Another example of photothermal detection used in an FIA system was reported with the application of the commercial interferometric photothermal equipment.…”

Section: Molecular Spectroscopy Detectionsmentioning

confidence: 99%

Recent advances in flow injection analysis

Trojanowicz

Kołacińska

2016

Analyst

170

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A dynamic development of methodologies of analytical flow injection measurements during four decades since their invention has reinforced the solid position of flow analysis in the arsenal of techniques and instrumentation of contemporary chemical analysis. With the number of published scientific papers exceeding 20,000, and advanced instrumentation available for environmental, food, and pharmaceutical analysis, flow analysis is well established as an extremely vital field of modern flow chemistry, which is developed simultaneously with methods of chemical synthesis carried out under flow conditions. This review work is based on almost 300 original papers published mostly in the last decade, with special emphasis put on presenting novel achievements from the most recent 2-3 years in order to indicate current development trends of this methodology. Besides the evolution of the design of whole measuring systems, and including especially new applications of various detections methods, several aspects of implications of progress in nanotechnology, and miniaturization of measuring systems for application in different field of modern chemical analysis are also discussed.

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Section: Molecular Spectroscopy Detectionsmentioning

confidence: 99%

Recent advances in flow injection analysis

Trojanowicz

Kołacińska

2016

Analyst

170

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“…Accordingly, we used a modified version of the recently developed ultrasensitive method based on the thermal lens technique to determine the concentration of any possible leaking of Ag 0 NPs from the composites during the bioassay. 49,50 No experiment was carried out accessed by following the link in the citation at the bottom of the page. Vol 8, No.…”

Section: Release Of Ag 0 Nps From the [Cel+ker+ag 0 Nps] Compositesmentioning

confidence: 99%

One-Pot Synthesis of Biocompatible Silver Nanoparticle Composites from Cellulose and Keratin: Characterization and Antimicrobial Activity

Tran

Prosenc

Franko

et al. 2016

ACS Appl. Mater. Interfaces

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A novel, simple method was developed to synthesize biocompatible composites containing 50% cellulose (CEL) and 50% keratin (KER) and silver in the form of either ionic (Ag + ) or Ag 0 nanoparticles (Ag + NPs or Ag 0 NPs). In this method, butylmethylimmidazolium chloride ([BMIm + Cl -]), a simple ionic liquid, was used as the sole solvent and silver chloride was added to the [BMIm + Cl -] solution of [CEL+KER] during the dissolution process. The silver in the composites can be maintained as ionic silver (Ag + ) or completely converted to metallic silver (Ag 0 ) by reducing it with NaBH4. The results of spectroscopy [Fourier transform infrared and X-ray diffraction (XRD)] and imaging [scanning electron microscopy (SEM)] measurements confirm that CEL and KER remain chemically intact and homogeneously distributed in the composites. Powder XRD and SEM results show that the silver in the [CEL+KER+Ag + ] and [CEL+KER+Ag 0 ] composites is homogeneously distributed throughout the composites in either Ag + (in the form of AgClNPs) or Ag 0 NPs form with sizes of 27 ± 2 or 9 ± 1 nm, respectively. Both composites were found to exhibit excellent antibacterial activity against many bacteria including Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, methicillin-resistant S. aureus (MRSA), and vancomycin-resistant Enterococus faecalis (VRE). The antibacterial activity of both composites increases with the Ag + or Ag 0 content in the composites. More importantly, for the same bacteria and the same silver content, the [CEL+KER+AgClNPs] composite is relatively more toxic than [CEL+KER+Ag 0 NPs] composite. Experimental results confirm that there was hardly any Ag 0 NPs release from the [CEL+KER+Ag 0 NPs] composite, and hence its antimicrobial activity and NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page. Vol 8, No. 50 (2016): pg. 34791-34801. DOI. This article is © American Chemical Society and permission has been granted for this version to appear in e-Publications@Marquette. American Chemical Society does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from American Chemical Society. ACS Applied materials & Interfaces,3 biocompatibility is due not to any released Ag 0 NPs but rather entirely to the Ag 0 NPs embedded in the composite. Both AgClNPs and Ag 0 NPs were found to be toxic to human fibroblasts at higher concentration (>0.72 mmol), and for the same silver content, the [CEL+KER+AgClNPs] composite is relatively more toxic than the [CEL+KER+Ag 0 NPs] composite. As expected, by lowering the Ag 0 NPs concentration to 0.48 mmol or less, the [CEL+KER+Ag 0 NPs] composite can be made biocompatible while still retaining its antimicrobial activity against bacteria such as E. coli, S. aureus, P. aeruginosa, MRSA, and VRE. These results, together with our previous finding that [CEL+KER] composites can ...

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“…High-sensitivity measurements for spectroscopic characterization and detection of low-absorption transparent liquid samples are provided by techniques based on the thermal lens (TL) effect [7][8][9]. It is generated by a modulated laser beam heating the sample; as a result temperature gradients (TG) are produced [10,11] and cause an intensity change of the laser probe beam (PB) that passes through the TL.…”

Section: Introductionmentioning

confidence: 99%

Determination of Fe(II) by Optimized Thermal Lens Microscope

2015

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A simple and accurate method for the determination of Fe(II) species in liquid solutions was developed. The measurement principle was realized by the photothermal effect and performed by the use of a thermal lens microscope (TLM) in its optimized, mode-mismatched configuration with a counter-propagating probe beam (PB) and an excitation beam (EB). Additionally, due to the combination of the collimated PB and tightly focused EB measurement, the detection limit was significantly decreased. Our preliminary results demonstrated that a TLM enables the detection of iron ions at the levels of µg·L −1 , which makes this technique an alternative to traditional spectroscopic methods as a promising detector for the ultrasensitive determination of different compounds in liquid solutions.

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Thermal Lens Spectrometric Determination of Colloidal and Ionic Silver in Water

Cited by 14 publications

References 20 publications

Recent advances in flow injection analysis

Recent advances in flow injection analysis

One-Pot Synthesis of Biocompatible Silver Nanoparticle Composites from Cellulose and Keratin: Characterization and Antimicrobial Activity

Determination of Fe(II) by Optimized Thermal Lens Microscope

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