Determination of thioglycolic acid in cosmetics by capillary electrophoresis

Xie, Ning; Ding, Xin; Xin-yu, Wang; Wang, Ping; Zhao, S. J.; Wang, Zhi

doi:10.1016/j.jpba.2013.10.003

Cited by 15 publications

(9 citation statements)

References 14 publications

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“…The carboxylic acid moiety in TGA (pKa1 (-COOH) = 4.32, pKa2 (-SH) = 10.2) 41,42 can hydrogen bond with water molecules, and are partially deprotonated. The ammonium chloride moiety in CAH (pKa1 (-SH) = 8.27, pKa2 (-NH2) = 10.53) 41,43 ionizes and interacts favorably with water.…”

Section: Physico-chemical Properties Of Chemically-patterned Substratesmentioning

confidence: 99%

Reusable Chemically-Micropatterned Substrates via Sequential Photoinitiated Thiol-Ene Reactions as Template for Perovskite Thin-Film Microarrays

Piecco¹,

Vicente²,

Pyle³

et al. 2019

Preprint

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<p>Patterning semiconducting materials are important for many applications such as microelectronics, displays, and photodetectors. Lead halide perovskites are an emerging class of semiconducting materials that can be patterned via solution-based methods. Here we report an all-benchtop patterning strategy by first generating a patterned surface with contrasting wettabilities to organic solvents that have been used in the perovskite precursor solution then spin-coating the solution onto the patterned surface. The precursor solution only stays in the area with higher affinity (wettability). We applied sequential sunlight-initiated thiol-ene reactions to functionalize (and pattern) both glass and conductive fluorine-doped tin oxide (FTO) transparent glass surfaces. The functionalized surfaces were measured with the solvent contact angles of water and different organic solvents and were further characterized by XPS, selective fluorescence staining, and selective DNA adsorption. By simply spin-coating and baking the perovskite precursor solution on the patterned substrates, we obtained perovskite thin-film microarrays. The spin-coated perovskite arrays were characterized by XRD, AFM, and SEM. We concluded that Patterned substrate prepared via sequential sunlight-initiated thiol-ene click reactions is suitable to fabricate perovskite arrays via the benchtop process. In addition, the same patterned substrates can be reused several times until a favorable perovskite microarray is acquired. Among a few conditions we have tested, DMSO solvent and modified FTO surfaces with alternatively carboxylic acid and alkane is the best combination to obtain high-quality perovskite microarrays. The solvent contact angle of DMSO on carboxylic acid-modified FTO surface is nearly zero and 65±3<sup>o</sup> on octadecane modified FTO surface.</p>

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Section: Physico-chemical Properties Of Chemically-patterned Substratesmentioning

confidence: 99%

Reusable Chemically-Micropatterned Substrates via Sequential Photoinitiated Thiol-Ene Reactions as Template for Perovskite Thin-Film Microarrays

Piecco¹,

Vicente²,

Pyle³

et al. 2019

Preprint

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show abstract

“…The working standard solutions were prepared by serial dilutions of the stock solutions with sample extraction solution to the desired concentrations (1.5, 3.0, 5.0, 10.0, 25.0, 50.0, 100.0 and 200.0 mg/L). The corrected peak area (A c ) was used for quantification (Xie et al, 2014). The calibration curves were constructed between the A c and the concentrations (q, mg/L) of the ten preservatives.…”

Section: Preparation Of Standards and Calibrationmentioning

confidence: 99%

“…The aim of the present work was to improve the previous MEKC method to detect ten preservatives in ten different kinds of food samples by simply increasing the length of the capillary and injection time of the sample, reducing the separation voltage and improving the sample pretreatment methods. The key factors which influence the extraction and quantitative analysis of the ten preservatives in food samples, such as the selection of the sample extraction solution for different sample matrices, the type and content of organic solvents in the sample buffer (Li et al, 2011Xie et al, 2014), were investigated in detail. Four hundred and thirteen food samples collected from local supermarkets and farmers' markets were analyzed by the improved MEKC method and satisfactory results were obtained.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of ten preservatives in ten kinds of foods by micellar electrokinetic chromatography

et al. 2015

Self Cite

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“…Since TGA is the main ingredient in hair perm agent, its simple and accurate sensing will be welcome. So far many attempts have been made to develop analytical methods for TGA determination, such as, chromatographic method, [6] electrochemical analysis, [7] potentiometry, [8] capillary electrophoresis, [9] spectroscopic method [10] and colorimetry [11] . Some of the methods need sophisticated instrumentations and time‐consuming, and hence, simple, cheap and sensitive detection method for TGA is highly needed.…”

Section: Introductionmentioning

confidence: 99%

Surface‐Bonding‐Enhanced Self‐Co‐Reactant Electrogenerated Chemiluminescence for Sensitive and Selective Detection of Thioglycolic Acid in Cosmetics

Kitte

Bushira

et al. 2022

Chemistry A European J

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Thioglycolic acid (TGA) is an organic compound widely used in cosmetics that cause a variety of health problems when overexposed to it. So far many attempts have been made to develop methods for TGA detection, but most of them need sophisticated instrumentations and are a little bit complicated. Therefore, a simple, cheap and sensitive detection method of TGA is highly desired. Herein, we demonstrated for the first time an Au−S bonding amplified, highly sensitive electrochemiluminescence (ECL) sensing method for TGA detection using tris(2,2′‐bipyridyl)ruthenium(II) (Ru(bpy)32+) as a luminophore and TGA as a self‐co‐reactant, via an anodic reaction at the Au electrode surface. Due to different molecular coordination environments of the TGA at the electrode surface, the ECL signal intensity of the developed ECL system gives much higher ECL signal in borate buffer than phosphate buffer of the same pH. Under the optimized experimental conditions, the ECL intensity has a direct relationship with the concentration of TGA in the range of 0.03 μM to 300 μM and a limit of detection of 0.013 μM (3σ/m). The reported ECL system has further been applied for the detection of TGA in cosmetics with acceptable recoveries.

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Determination of thioglycolic acid in cosmetics by capillary electrophoresis

Cited by 15 publications

References 14 publications

Reusable Chemically-Micropatterned Substrates via Sequential Photoinitiated Thiol-Ene Reactions as Template for Perovskite Thin-Film Microarrays

Reusable Chemically-Micropatterned Substrates via Sequential Photoinitiated Thiol-Ene Reactions as Template for Perovskite Thin-Film Microarrays

Simultaneous determination of ten preservatives in ten kinds of foods by micellar electrokinetic chromatography

Surface‐Bonding‐Enhanced Self‐Co‐Reactant Electrogenerated Chemiluminescence for Sensitive and Selective Detection of Thioglycolic Acid in Cosmetics

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