To investigate the effects of three commercial bleaching agents (hydrogen peroxide, sodium percarbonate and sodium hypochlorite) on textile products, the structural changes and chemical damage caused by these bleaching agents on wool fabrics were quantitatively characterised using attenuated total reflection Fourier Transform–infrared (ATR‐FTIR) spectroscopy. A comparison of the spectral changes before and after the treatment showed that the wool fabrics treated with sodium hypochlorite and sodium percarbonate were severely and slightly damaged, respectively. By contrast, the fabrics treated with hydrogen peroxide were almost undamaged and whiter. Compared with untreated wools, or those treated with oxygen‐bleaching agents (sodium percarbonate and hydrogen peroxide), the amide I band centred at 1647 cm −1 in the ATR‐FTIR spectra of the wool fabrics broadened significantly after the treatment with the chlorine‐bleaching agent (sodium hypochlorite). Furthermore, the amide I band broadened, and the intensity of the amide III band centred at 1235 cm −1 increased with increasing the chlorine content and yellowing in the wool fabrics. Based on these experiments, it was concluded that the structural changes and chemical damage caused by the chlorine‐bleaching treatment of wool fabrics caused the oxidative cleavage of SS groups and the randomisation of cortex structures due to chlorination.

2026-01-02·POLYCYCLIC AROMATIC COMPOUNDS

Synthesis and Investigation of Antimicrobial, Antioxidant, Enzymatic Inhibitory, and Antiproliferative Activities of Ruthenium (II) Complexes Bearing Benzimidazole-Based N-Heterocyclic Carbene (NHC) Ligands

作者: Al-Hazmy, Sadeq M. ; Al-Tamimi, Jameel ; Özdemir, Ismail ; Hamdi, Naceur ; Mansour, Lamjed ; Gurbuz, Nevin

The benzimidazolium salts were synthesized by quaternization of 1-(4-tert-butylbenzyl)benzimidazole, with the corresponding benzyl bromides.The reactions were carried out in DMF at 70° for 48 h.Therefore, Ag₂O and benzimidazolium salts were reacted in dichloromethane at room temperature under dark and Ag(I)-NHC complexes were obtained in very good yields.The Ru(II)-NHC complexes [(η⁶-p-cymene)RuCl₂(1-R¹-3-R²-2-Bzim)] (4a-d; 2-Bzim = 2-benzimidazolylidene, R¹ = 4-^tBuC₆H₄CH₂; R² = 4-MeC₆H₄CH₂, 2,3,5,6-Me₄C₆HCH₂, 4-^tBuC₆H₄CH₂, 3,5-Me₂C₆H₃CH₂) were synthesized via transmetalation reaction from the corresponding silver complexes [(1-R¹-3-R²-2-Bzim)AgCl].The structures of the obtained compounds were characterized by different spectroscopic techniques such as ¹H and ¹³C NMR, elemental anal., and m.p. detection.The lowest MICs values were obtained with the two complexes 4b,d.Enzymic inhibitory investigation against acetylcholinesterase (AChE) and tyrosinase (TyrE), showed that the two complexes and are the most potent inhibitors against (AChE) with an IC₅₀ of 2.52 and 5.06 μg mL^-1 resp., and against (TyrE) with an IC₅₀ of 19.88 and 24.95 μg mL^-1 resp.Screening of the selected N-Heterocyclic carbene (NHC) ligands and their resp. ruthenium (II) complexes against colon carcinoma cells lines (HCT-116) and hepatocellular carcinoma cells lines (HepG-2).Furthermore, compounds were showed weak cytotoxic action with IC₅₀ ranging from 13.38 to 18.33 μg in human colon carcinoma cancer cell lines and from 14.36 to 18.45 μg in hepatocellular carcinoma cells lines.

2026-01-01·TOPICS IN CATALYSIS

Recycled Battery Carbon Composite Sensor for the Electrochemical Analysis of the Neurotransmitter Dopamine

作者: Mohammad, Saikh ; Aldossari, Samar A. ; Manjunatha, J. G. ; Ataollahi, Narges ; Moulya, K. P.

Abstract: The current article reveals a new, simple, non-toxic, sensitive, and environmentally friendly electrochem. approach for the anal. of the neurotransmitter dopamine (DP) by fabricating tartrazine (TZ) on graphite and carbon nanotube composite electrode (GP-CNTCPE) using cyclic voltammetry (CV).The graphite powder used for the anal. was extracted from a dry cell.The sensitive and selective TZ-modified composite electrode (TZ/GP-CNTCPE) displayed an effective electrochem. behavior of DP.The characteristics of both unmodified and modified sensors were evaluated using SEM (SEM) and electrochem. impedance studies (EIS).DP exhibited a good oxidation and reduction current response in phosphate buffered saline (PBS) of 6.5 pH.The concentration variation anal. of DP in the linear range of 0.2 μM-10.0 μM exhibited a limit of detection (LOD) of 0.39 μM and a limit of quantification (LOQ) of 1.33 μM.The anti-interference property was observed for TZ/GPCNTCPE in the existence of organic compounds and metal ions.The simultaneous anal. of DP in the presence of tyrosine (TY) indicated the good selectivity of the developed sensor.The pharmaceutical sample anal. for the presence of DP showed a fine recovery rate, and hence the developed sensor can be applicable to the real sample.

100 项与 GABAB receptor agonists 6057(Nanjing University) 相关的药物交易

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