Effect of structure and concentration of polymer, metal ion and pH of the medium on the fluorescence characteristics of hyperbranched polyamines

Mahapatra, Sibdas Singha; Das, Upamanyu; Karak, Niranjan

doi:10.1016/j.jlumin.2008.05.019

Cited by 10 publications

(4 citation statements)

References 39 publications

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“…Attributed to their unique molecular architecture, hyperbranched polyamidoamines usually possessed many internal cavities, serving as nanocontainers to encapsulate different guest micro-molecules, such as drug molecules, metal ions, dye molecules, and so forth. , Due to plenty of alkalescent secondary/tertiary amines and electropositive viologen groups in the EHP structure, the resultant EHP/PAM hydrogels were speculated to be pH sensitive, whose conformational structure could be readily tuned through protonation and charge reversal. , These advantages would possibly endow EHP/PAM hydrogels with the pH-controlled release of adenosine triphosphate sodium (ATP – ), which was used as a model drug.…”

Section: Resultsmentioning

confidence: 99%

“…41,42 Due to plenty of alkalescent secondary/tertiary amines and electropositive viologen groups in the EHP structure, the resultant EHP/PAM hydrogels were speculated to be pH sensitive, whose conformational structure could be readily tuned through protonation and charge reversal. 35,43 These advantages would possibly endow EHP/ PAM hydrogels with the pH-controlled release of adenosine triphosphate sodium (ATP − ), which was used as a model drug.…”

Section: Strainmentioning

confidence: 99%

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Conductive Viologen Hydrogel Based on Hyperbranched Polyamidoamine for Multiple Stimulus-Responsive Drug Delivery

Zhao

Zhou

Wang³

et al. 2023

ACS Appl. Mater. Interfaces

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The emergence of precision medicine and personalized pharmacotherapy has led to the development of advanced drug delivery systems that can respond to multiple stimuli. Conductive hydrogels have excellent electrical signal responsiveness and drug storage capabilities; however, current conductive hydrogels suffer from poor mechanical properties, low ionic conductivity, and high voltage. Herein, a covalently crosslinked viologen hydrogel was prepared using electroactive hyperbranched polyamidoamine (EHP) as the crosslinking center in a polymeric network. Attributed to its unique molecular architecture, this hydrogel exhibits improved mechanical properties (high tensile strength and desirable stretchability up to 1280%). Approvable ionic conductivity, biocompatibility, antibacterial properties, and wearable strain-sensing performance were also disclosed, ascribed to the participation of versatile viologen groups in the hydrogel structure. This hydrogel exhibited high efficiency in drug release (81.6%) at a lower voltage of −1.2 V. Moreover, fascinating pH-stimulus drug release behavior was also demonstrated in both acidic and alkalescent environments owing to the dramatic conformational transition of EHP. This work provides a new design strategy for conductive hydrogels for multiple stimulusresponsive drug delivery systems.

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Section: Resultsmentioning

confidence: 99%

Section: Strainmentioning

confidence: 99%

Conductive Viologen Hydrogel Based on Hyperbranched Polyamidoamine for Multiple Stimulus-Responsive Drug Delivery

Zhao

Zhou

Wang³

et al. 2023

ACS Appl. Mater. Interfaces

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“…A previous study revealed that freezing aqueous protein solutions shifts the fluorescence spectra of classes I, II, and III toward shorter wavelengths because of the immobilisation of their polar environments (Han et al ., 2018). However, a significant decrease in fluorescence intensity was noticed, while the blue shift in the fluorescence peak did not appear in our research, which may be connected to the changes in interaction forces, pH, and the states of compounds (Mahapatra et al ., 2008).…”

Section: Resultsmentioning

confidence: 99%

Black rice flour‐induced changes in gluten conformation in fresh, pre‐fermented and frozen dough

Feng

Sun

et al. 2022

Int J of Food Sci Tech

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Summary Black rice flour greatly enriches the nutrition of flour products, and also alleviates the quality deterioration of frozen dough to a certain extent, but the gluten‐influenced mechanism remains unclear. The effects of black rice flour with different particle sizes on protein molecular weight distribution, secondary structure, fluorescence characteristics, thermogravimetric properties, and chemical interaction of the fresh dough (FD), pre‐fermented dough (PD), and thawed dough (TD) were investigated. The addition of black rice flour resulted in the breaking of disulfide bonds in the FD and an increase in the content of total SDS‐extractable protein. However, the depolymerization of large glutenin polymers in the PD and TD of the composite flour system was lower than wheat flour system, especially in the dough with small particle size black rice flour. As the particle size of black rice flour decreased, the intermolecular force of the composite flour dough system is more prominent, of which the hydrophobic interaction force contributes the most considerable value. In addition, TD in the composite flour system has less weight loss than that of wheat flour system. Therefore, adding black rice flour reduced the deterioration of gluten protein, and the small particle size of black rice flour showed advantages.

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“…Karak and coworkers [71,72] synthesized hyperbranched polyamines (hb-P7 and hb-P8) with s-triazine moieties (Scheme 7), which had added advantages including high thermostability, flame retardancy, good electronic property et al The large numbers of active amino groups in the structure of FHBPs make it essay to form complex with metal ions and possible to sensitively detect them.…”

Section: Fhbps For Metal Ions Detectionmentioning

confidence: 99%

Stimulus responsive fluorescent hyperbranched polymers and their applications

et al. 2010

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Fluorescent hyperbranched polymers (FHBPs), which combine the versatile fluorescent property with unique characteristics of hyperbranched architecture, are desirable candidates for stimulus responsive materials. This review demonstrates the structure and environment-dependent emission behaviors of a series of FHBPs. AEE active FHBPs showing opposite performance to ACQ effect are used to sensitively detect explosives and a superamplification effect is found. Specially designed FHBPs can complex with metal ions, leading to fluorescence turn-off due to complex quenching effect. The protonation of amino-containing FHBPs exhibits pH-dependent fluorescence responses to solution acidity. Some FHBPs containing responsive moieties are photo-and thermo-sensitive, and show potential applications as smart materials. fluorescent hyperbranched polymer, explosives and metal ions detection, pH responsive, optical and thermal sensitive

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Effect of structure and concentration of polymer, metal ion and pH of the medium on the fluorescence characteristics of hyperbranched polyamines

Cited by 10 publications

References 39 publications

Conductive Viologen Hydrogel Based on Hyperbranched Polyamidoamine for Multiple Stimulus-Responsive Drug Delivery

Conductive Viologen Hydrogel Based on Hyperbranched Polyamidoamine for Multiple Stimulus-Responsive Drug Delivery

Black rice flour‐induced changes in gluten conformation in fresh, pre‐fermented and frozen dough

Stimulus responsive fluorescent hyperbranched polymers and their applications

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