Photo-oxidation processes of Rhodamine B: A chromatographic and mass spectrometric approach

Sabatini, Francesca; Giugliano, Roberta; Degano, Ilaria

doi:10.1016/j.microc.2018.04.018

Cited by 41 publications

(23 citation statements)

References 42 publications

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“…A possible explanation for the presence of peaks 1 and 2 is that they are by-products remaining from the manufacturing process of Rhodamine B dye, such as the starting material N,N-diethyl-m-aminophenol [12] or an impurity such as N-ethyl-m-aminophenol. Alternatively, peaks 1 and 2 may arise from photo-oxidation of pure Rhodamine B, as described recently by Sabatini et al [13]. The fact that peaks 1 and 2 are much smaller in Fig.…”

Section: Detached Sequins 1 Andmentioning

confidence: 56%

Materials characterization of the Ruby Slippers from the 1939 classic film, The Wizard of Oz

et al. 2018

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This article presents a comprehensive materials characterization of a pair of Ruby Slippers used in the 1939 classic film The Wizard of Oz, which has been one of the most popular objects on exhibition at Smithsonian's National Museum of American History (NMAH) since it entered the collection in 1979. The shoes have been on almost constant display with few instances for study during its time at NMAH, and they remain one of the most visited objects within the museum. Plans for an upcoming permanent exhibit, and visible deterioration of the decades-old shoes, led to the present study, which was the first phase of a major effort to preserve this iconic item of cultural heritage for future generations to enjoy. Materials characterization was used to determine the composition of construction materials and condition of the Ruby Slippers to help plan for the optimal environmental conditions for continued display. The current study is also viewed as a valuable opportunity to learn about the original construction and subsequent history of the Ruby Slippers to inform and enrich NMAH's curatorial research, public programs, and media initiatives. Analytical methods used to characterize the shoes' components include micro-X-ray fluorescence spectroscopy (µ-XRF), micro-Fourier transform infrared spectroscopy (µ-FTIR), polarized light microscopy (PLM), and high-performance liquid chromatography-diode array detector-mass spectrometry (HPLC-DAD-MS).

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Section: Detached Sequins 1 Andmentioning

confidence: 56%

Materials characterization of the Ruby Slippers from the 1939 classic film, The Wizard of Oz

et al. 2018

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“…Most interestingly, a core‐shell column allows the same performance of a column with smaller diameter particles but ensuring lower backpressures [45]. Poroshell 120 EC C18 was already used for the analysis of triglycerides [46] but only very recently also applied to synthetic dyes separation and detection in foodstuff, textiles, and painted polyurethanes [42,45,47].…”

Section: Resultsmentioning

confidence: 99%

“…The sample pretreatment used for extracting dyes from painting matrix has been already optimized for other xanthene dyes [42] and it was as follow: addition of 200 μL of DMSO, sonication (ultrasonic bath Sonorex Supra 10P, Bandelin Electronics, Germany) for 10 min at 60°C, filtration of the supernatant with PTFE syringe filter, and injection in the chromatographic systems.…”

Section: Methodsmentioning

confidence: 99%

Development of a method based on high‐performance liquid chromatography coupled with diode array, fluorescence, and mass spectrometric detectors for the analysis of eosin at trace levels

Sabatini

Degano

Colombini

2020

Separation Science Plus

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Eosin (Acid Red 87, C.I. 45380) is one of the most brilliant and challenging early synthetic dyes. In this study, an analytical approach based on high‐performance liquid chromatography coupled with diode array and fluorescence detector and high resolution mass spectrometry was developed for testing different analytical columns and acids in the mobile phase. The ultra‐sensitive approach, based on a chromatographic separation on a solid core and a porous shell Poroshell 120 EC‐C18, allowed us to detect and characterize eosin and its synthesis by‐products, such as the debrominated and methyl ester forms of eosin, in trace levels (the limit of detection for eosin is 0.13 ppb). The resulting miscellaneous composition of the eosin standard highlights the importance to determine the exact composition of the starting material to deal with, in order to avoid misinterpretations in aged or degraded samples. Finally, the successful identification of eosin in few grains (approximatively 20 × 40 μm wide) of a faded Van Gogh's painting proved the strengths of our approach.

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“…HPLC was performed to investigate the organic pigments contained in the sample. The method is a slight adaptation of a previously published method used to study reference synthetic organic dyes and pigments [4]. The sample pre-treatment prior to both chromatographic analyses consisted in the addition of 500 μl of dimethyl sulfoxide to approximately 850 µg of sample, followed by sonication (ultrasonic bath Sonorex Supra 10P, Bandelin Electronics, Germany) for 10 min at 60 °C.…”

Section: High Performance Liquid Chromatography With Diode Array Detementioning

confidence: 99%

“…In particular, some classes of synthetic organic pigments (SOPs) are labile and vulnerable to fading and photo-oxidation phenomena [3]. The knowledge of their exact composition, in terms of both major and minor components, is mandatory to disclose the chemical behaviour of a specific SOP over time [4].…”

Section: Introductionmentioning

confidence: 99%

Synthetic materials in art: a new comprehensive approach for the characterization of multi-material artworks by analytical pyrolysis

et al. 2019

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Modern art materials introduced since the end of XIX century include a large number of formulations of synthetic polymers and pigments, whose degradation processes and best preservation conditions are a major issue in heritage science. Analytical pyrolysis coupled with gas chromatography and mass spectrometry (Py-GC/MS) is widely used for the characterisation of polymeric materials and organic pigments, however the interpretation of the pyrograms obtained from samples containing different analytes is not straightforward. To improve our understanding on how these materials behave in complex matrices, we used evolved gas analysis coupled with mass spectrometry (EGA-MS) and multi shot Py-GC/MS to highlight and analyse the different fractions in a sample from a pop-art made of painted polyurethane (PU) foam. The study represents a proof of concept to evaluate EGA-MS potential in studying composite modern art materials in combination with multi-shot pyrolysis. The aim of the investigation was establishing the composition of the PU formulation, the paint binder and the pigments, thereby contributing to planning the stabilisation and conservation of the object. The polymers and the class of synthetic organic pigments present in the paint were assessed by determining their specific pyrolysis products and through comparisons with data in the literature. EGA-MS analysis provided both thermal and chemical information in one analytical run, so that we could select four temperatures for use in multi-shot Py-GC/MS analysis and thus to selectively study the different fractions evolved at different temperatures. Information on the various components of the mixture was obtained, including additives and organic pigments, separating them on the basis of their different thermal degradation temperatures. The multianalytical approach included also non-destructive ATR-FTIR and enabled us to characterize in detail different synthetic materials: polyether-based polyurethane produced by the polyaddition of 2,6-diisocyanate toluene, hexamethylene diisocyanate and polypropylene glycol, vinyl paint, and a mixture of β-naphthol and mono-azo as pigments. HPLC-DAD and HPLC-ESI-MS analyses confirmed the pigments, and provided a positive identification of two β-naphthols (PO5 and PR1) and two monoazo pigments (PY1 and PY3).

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Photo-oxidation processes of Rhodamine B: A chromatographic and mass spectrometric approach

Cited by 41 publications

References 42 publications

Materials characterization of the Ruby Slippers from the 1939 classic film, The Wizard of Oz

Materials characterization of the Ruby Slippers from the 1939 classic film, The Wizard of Oz

Development of a method based on high‐performance liquid chromatography coupled with diode array, fluorescence, and mass spectrometric detectors for the analysis of eosin at trace levels

Synthetic materials in art: a new comprehensive approach for the characterization of multi-material artworks by analytical pyrolysis

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