Novel Stilbene-triazine Symmetrical Optical Brighteners: Synthesis and Applications

Saeed, Aamer; Shabir, Ghulam; Batool, Iram

doi:10.1007/s10895-014-1392-1

Cited by 15 publications

(5 citation statements)

References 9 publications

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“…FTIR spectra of BHA and L-PC were compared with FTIR data of other triazine-stilbene OBs published in literature related to the synthesis and the structural analysis of OBs derivatives of DSD acid-triazine. FTIR spectra of these OBs showed two peaks corresponding to triazine-ring skeleton vibrations [29,30,31,32]. In the case of BHA these peaks were at 1418 and 1500 cm −1 and in the case of L-PC at 1390 and 1490 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Respirometric Study of Optical Brighteners in Textile Wastewater

et al. 2019

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Optical brighteners (OBs) are colorless fluorescent dyes, widely used in industry to improve whiteness in materials. Nearly 80% of all OBs in the market are derivatives of stilbene. They absorb the near-ultraviolet light and re-emit most of it in the blue range as visible fluorescence. OBs are commonly applied on textiles, detergents, paper and plastic products, among others. OBs have a low degradation ratio. In biological plants, they can only be partially removed by adsorption into the sludge and a tertiary treatment could be required to fully remove them. Part of them may persist and can be found in river and lake waters. The current work aims to evaluate the effect of the OBs in the bacterial activity of biological wastewater treatment plants. The influence of two commercial OBs (Goldblanc BHA and Leucophor PC) on respiration rate was monitored by means of a semi-continuous electrolytic respirometer, in order to obtain information related to the growth of the biomass and the degradation of the substrate. Their acute toxicity was also determined. It was concluded that the OB effect on bacteria population is variable depending on its chemical structure. Unlike the former, the Leucophor-PC brightener had an impact on the respirometric rate.

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Section: Resultsmentioning

confidence: 99%

Respirometric Study of Optical Brighteners in Textile Wastewater

et al. 2019

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“…Moreover, 53c was active against both Gram-positive and Gram-negative bacteria and exhibited a high cell uptake of 72%, demonstrating a positive correlation between cell uptake and antimicrobial activity [92]. Stilbene derivatives are optical whitening agents, absorbing invisible ultraviolet (UV) light at wavelengths below 400 nm and emitting violet-blue fluorescence in the UV-visible region, thus providing brightness and whiteness to a matrix [95]. However, stilbenes cis/trans isomerisation may occur upon exposure to sunlight, leading to fluorescence reduction.…”

Section: Nitrogen and Sulfur-containing Stilbene Derivativesmentioning

confidence: 99%

“…In addition, the dimethylamino derivatives resulted to be more potent than the corresponding ethoxy-containing compounds [94]. The natural stilbenoid (E)-3-hydroxy-5-methoxystilbene (Figure Stilbene derivatives are optical whitening agents, absorbing invisible ultraviolet (UV) light at wavelengths below 400 nm and emitting violet-blue fluorescence in the UV-visible region, thus providing brightness and whiteness to a matrix [95]. However, stilbenes cis/trans isomerisation may occur upon exposure to sunlight, leading to fluorescence reduction.…”

Section: Nitrogen and Sulfur-containing Stilbene Derivativesmentioning

confidence: 99%

Stilbenoids: A Natural Arsenal against Bacterial Pathogens

et al. 2020

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The escalating emergence of resistant bacterial strains is one of the most important threats to human health. With the increasing incidence of multi-drugs infections, there is an urgent need to restock our antibiotic arsenal. Natural products are an invaluable source of inspiration in drug design and development. One of the most widely distributed groups of natural products in the plant kingdom is represented by stilbenoids. Stilbenoids are synthesised by plants as means of protection against pathogens, whereby the potential antimicrobial activity of this class of natural compounds has attracted great interest in the last years. The purpose of this review is to provide an overview of recent achievements in the study of stilbenoids as antimicrobial agents, with particular emphasis on the sources, chemical structures, and the mechanism of action of the most promising natural compounds. Attention has been paid to the main structure modifications on the stilbenoid core that have expanded the antimicrobial activity with respect to the parent natural compounds, opening the possibility of their further development. The collected results highlight the therapeutic versatility of natural and synthetic resveratrol derivatives and provide a prospective insight into their potential development as antimicrobial agents.

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“…Certain natural conditioners and silicone conditioners tend to prompt yellowing to the subsequent finishing process. Some of the softeners for whiteness that are non-yellowing such as Gamasoft-KA, Sarasoft-SNY, Sarasoft-1367, Sarasoft-GA, Sarasoft-UK, or Supercone-2100, are suggested particularly for complete whiteness on the fabric [9,21]. Only softeners can not demonstrate the remarkable properties of anti-yellowing.…”

Section: Introductionmentioning

confidence: 99%