The investigation of thermal decomposition pathways of phenylalanine and tyrosine by TG–FTIR

Li, Jie; Liu, Yuwen; Jingyan, Shi; Wang, Zhiyong; Hu, Ling; Yang, Xi; Wang, Cunxin

doi:10.1016/j.tca.2007.10.014

Cited by 123 publications

(42 citation statements)

References 29 publications

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“…However, a similar behavior was previously reported on phenylalanine by Jie et al [45] The symbols rt and T dec represent room and decomposition temperatures, respectively. two competing pathways.…”

Section: Characterization Of Ilssupporting

confidence: 83%

Spectroscopic evaluation of chiral and achiral fluorescent ionic liquids

Marwani

2010

Open Chemistry

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Abstract:In this study, spectroscopic investigation of chiral and achiral room temperature ionic liquids is achieved. New ionic liquids were prepared via metathesis, accomplished by the reaction of either L-phenylalanine ethyl ester hydrochloride, chlorpromazine hydrochloride or 1,10-Phenanthroline monohydrate hydrochloride with lithium bis(trifluoromethane) sulfonamide in water. The resulting ionic liquids were produced in high yield and purity. The results obtained by use of 1 H NMR and IR experiments were in very good agreement with the chemical structures of the synthesized ionic liquids. In addition, the results of thermal gravimetric analysis suggested that these ionic liquids have good thermal stability. UV-Vis and fluorescence spectroscopy measurements indicated that these ionic liquids are strongly optically absorbent and fluorescent. Lastly, time-based fluorescence steady-state measurements demonstrated the high photostability of these ionic liquids.

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Section: Characterization Of Ilssupporting

confidence: 83%

Spectroscopic evaluation of chiral and achiral fluorescent ionic liquids

Marwani

2010

Open Chemistry

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“…In the recent work, Jie et al . have used a semiquantitative method to determine the concentration using the FTIR absorbance spectrum of some gaseous mixtures.…”

Section: Theorymentioning

confidence: 99%

The investigation of thermal decomposition pathway and products of poly(vinyl alcohol) by TG‐FTIR

Taghizadeh

Yeganeh

Rezaei

2015

J of Applied Polymer Sci

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A generalized form of a semiquantitative method has been developed based on the multilinear least-squares regression technique applied on the entire FTIR absorbance spectrum of a gaseous mixture to determine components concentration. Thermal degradation of poly(vinyl alcohol) samples with high, PVA(98), and low degree of hydrolysis, PVA(80), has been investigated by TG-FTIR simultaneous analysis performed in an inert atmosphere. Analysis of gaseous products was carried out using a routine developed in Matlab and this routine returns the product concentration with a reasonable RMS error. The correlation coefficients of the original mixture spectrum with the mixed output were obtained at some specific peak temperatures using irAnalysis software. The first process is the loss of physically adsorbed water which followed by two main processes of thermal degradation. In spite of the similarity of evolved gaseous products, two samples showed some differences in components concentrations identified in the volatile mixture. Acetaldehyde has been identified as the main volatile product in the first thermal degradation step of PVA(98) and PVA(80). The second major degradation product of PVA(80) is acetic acid due to presence of more residual acetate group while 2-butenal have been identified for PVA(98). Water was mainly produced in the first stage of thermal degradation of PVA(98) while it was identified in the first and second stages for PVA(80). This might be attributed to existence of a competition between water and residual acetate group for elimination that postpones the complete elimination of OH group to the second degradation stage.

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“…Also, the signals between 2308 cm −1 and 2360 cm −1 indicate the presence of carbon dioxide [23]. The doublet from 964 cm −1 and 929 cm −1 confirms the release of ammonia through the gas evolved [24,25]. The signal from 1570 to 1640 cm −1 with the peak at 1604 cm −1 is specific to the aromatics.…”

Section: Identification Of Volatile Productsmentioning

confidence: 83%