Organic Compounds FT-IR Spectroscopy

Segneanu, Adina‐Elena; Gozescu, Ioan; Dabici, Anamaria; Sfîrloagă, Paula; Szabadai, Zoltan

doi:10.5772/50183

Cited by 23 publications

(15 citation statements)

References 8 publications

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“…However, Methyl sulfate aerosol collected on PTFE filters has two peaks between 4000 cm -1 and 2000 cm -1 and eight peaks between 1500 and 500 cm -1 (Figure 7), similar to reference spectra in Table S1 (AIST: SDBS, 2022). The doublets observed at 1020 cm -1 , 1000 cm -1 and the nearly overlapping peaks at 795 cm -1 and 784 cm -1 are identified as S-O-C by both FT-IR (Chihara, 1958;Segneanu et al, 2012;Shurvell, 2006) and Raman (Okabayashi et al, 1974). The S─O peaks from sulfate are observed around 1073 cm -1 and 591 cm -1 in the spectra, similar to the previous study where peaks from 591 cm -1 to 593 cm -1 , and at 1063 cm -1 (solid) and 1081 cm -1 (solution) were ascribed to sulfate in potassium methyl sulfate (Chihara, 1958).…”

Section: Gravimetrymentioning

confidence: 94%

Stability assessment of organic sulfur and organosulfate compounds in filter samples for quantification by Fourier Transform-Infrared Spectroscopy

Anunciado

Boskey

Haines

et al. 2023

Preprint

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Abstract. Organic sulfur and sulfate compounds, tracers for sources and atmospheric processes, are not currently measured in national monitoring networks such as the Interagency Monitoring of Protected Visual Environments (IMPROVE). The goal of this paper is to begin to assess the stability of organic sulfur and sulfate containing compounds on polytetrafluoroethylene (PTFE) filters and the suitability of Fourier-transform infrared (FT-IR) spectroscopy to measure these compounds. Stability assessment is needed because PTFE samples collected by IMPROVE are typically stored 6–9 months prior to analysis. For this study, two organosulfur compounds, methanesulfonic acid (MSA) and hydroxymethanesulfonate ion (HMS), and two organosulfate compounds, methyl sulfate (MS) and 2-methyltetrol sulfate (2-MTS), are collected individually on PTFE filters. Gravimetric mass measurements is used to assess mass stability over time. FT-IR spectra are evaluated to assess the capability of measuring the compound from PTFE filters by assessing the compound stability or chemical changes over time. Ion chromatography (IC) and Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) are used as an additional tool to assess stability or chemical changes over time. MS has the highest potential to be measured by FT-IR in IMPROVE samples. For MS, a simple organosulfate, the mass changes are within measurement uncertainty and FT-IR spectra indicate no compositional change over a 4-month period, suggesting MS can be measured using FT-IR. IC and ICP-OES support the conclusion that MS is stable on the filter. However, for 2-MTS, the other organosulfate measured in this study, spectral changes after a month on the filter suggests it decomposes into other organosulfates or an inorganic sulfate. MSA in IMPROVE samples can be measured, but only as a lower bound, due to volatility off of the filter as indicated by FT-IR and gravimetry. FT-IR and IC both show that MSA is not chemically changing over the course of the study. Measurements by all methods indicate HMS is unstable on PTFE filter and IC and FT-IR indicate that it likely converts to inorganic sulfate. Future work includes the evaluation of these compounds in as ambient aerosol sample matrix to determine any differences in stability and identify interferences that could limit quantification.

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Section: Gravimetrymentioning

confidence: 94%

Stability assessment of organic sulfur and organosulfate compounds in filter samples for quantification by Fourier Transform-Infrared Spectroscopy

Anunciado

Boskey

Haines

et al. 2023

Preprint

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“…As optimised reduction of histamine was observed at bromelain (200mg/L) samples effectively than Quercetin and Ascorbic acid hence the respective analysis considered for FTIR analysis. When compared with the 'Infrared Group Frequencies classification table' (Elena et al 2012), the compounds alcohols, aldehydes, amines, sulphates and esters were present in both of the samples of wine i.e. normal wine and Bromelain (200mg/L) incorporated wine; which indicates that there is no significant change in the composition of wine functional groups (Figure 7a…”

Section: Effect On Functional Groups (Ftir)mentioning

confidence: 99%

Reduction of food histamine in white wine by Bromelain, Quercetin and Ascorbic acid

Kalhaa

Damgude

Dabade

2021

FSAB

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The scope of this work was to reduce the level of the biogenic amine ‘histamine’ in White wine. Different concentrations of 100 ml wine samples were prepared by incorporating various concentrations Bromelain; Quercetin and Ascorbic acid. A spectrophotometric based histamine analysis method was carried out to determine histamine concentrations. The histamine concertation reduced in 200mg/L Bromelain, 50mg/L Quercetin and 400mg/L Ascorbic acid treated samples by 62.34%, 61.64% and 46.41% respectively. The percentage DPPH scavenging activity was found to be 83.93%, 93.54%, 133.08% respectively against normal wine 86.93%. No significant changes observed in physicochemical properties of wine like functional groups; particle size analysis; effect on amino acids; turbidity; colour analysis; pH and sensory analysis in bromelain treated wine samples as compared to other samples. Reduction of histamine can be carried out by Bromelain (200mg/L) effectively than Quercetin and Ascorbic acid; based on the reducing capacity and the sensory parameters.

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“…On the zone 2, second peak is about 2872.79cm -1 and 2854.33cm -1 is refer to alkyl group or CH 3 -which is in between 2960cm -1 to 2850 cm -1 . On the fingerprint zone, peak at 1457.49cm -1 , 1349.75cm -1 and 1249.66cm -1 are methylene or -CH 2 [8].…”

Section: Fig 5 Ftir Spectrum Of Both Samplesmentioning

confidence: 99%

Coagulant Dipping Time and Temperature Optimisation for Latex Glove Uneven Coating Investigation

Than

Phang

2018

MATEC Web Conf.

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Powdered glove is produced by natural latex with the aid of coagulant. The composition of the coagulant contains wetting agent, calcium nitrate as coagulant and anti-tack agent. Generally wetting agent causes foam and results in uneven wall thickness in glove production. Hence, the objective of this research was to select a suitable wetting agent sample that could be used by the production, as well as optimising the parameter such as temperature of coagulant, weight percentage of wetting agent and coagulant dipping time to reduce the rejection of uneven thickness. This paper presented the preliminary testing including foam height test, cloud point test, wetting agent characterisation and the samples mechanical analysis. Two setting agents (sample T and sample E) were chosen due to its availability in the production line. Throughout the wetting agent characterisation, sample T was preferred compared to sample E due to similar bonding of the wetting agent. The surface tension of coagulant and tensile strength of glove samples meet the glove industry standard at the variation of wetting agent amount. The optimise parameter were at 0.0175 wt% of wetting agent and 5 seconds dipping time at 63 °C. The average thickness of the gloves at this parameter was at 0.09 ± 0.004 mm which is at the acceptable level comparing to 0.1mm thickness of ASTM standard.

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Organic Compounds FT-IR Spectroscopy

Cited by 23 publications

References 8 publications

Stability assessment of organic sulfur and organosulfate compounds in filter samples for quantification by Fourier Transform-Infrared Spectroscopy

Stability assessment of organic sulfur and organosulfate compounds in filter samples for quantification by Fourier Transform-Infrared Spectroscopy

Reduction of food histamine in white wine by Bromelain, Quercetin and Ascorbic acid

Coagulant Dipping Time and Temperature Optimisation for Latex Glove Uneven Coating Investigation

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