Hydrogels From Acrylic Acid With N,n-Dimethylacrylamide: Synthesis, Characterization, and Water Absorption Properties

Pooley, S. Amalia; Rivas, Bernabé L.; Lillo, F; Pizarro, Guadalupe del C.

doi:10.4067/s0717-97072010000100006

Cited by 27 publications

(16 citation statements)

References 19 publications

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“…The relative difference in the mass losses between the conjugated-QDs may be attributed to the extra 5 % from the protein existing in MIP-QDs. At 450°C, raw QDs lose about 30 % of their initial mass, the polymer alone almost 85 %, corresponding to the organic polymer degradation [30] and the conjugated-QDs almost 70 % of their initial mass. From 450-950°C, both conjugated-QDs lose up to 95 % of their initial mass.…”

Section: Tga Analysismentioning

confidence: 99%

Label-free quantum dot conjugates for human protein IL-2 based on molecularly imprinted polymers

Piloto

Ribeiro

Rodrigues

et al. 2020

Sensors and Actuators B: Chemical

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Herein, the development of a fluorescent-based sensor by combining quantum dots (QDs) with molecularlyimprinted technology (MIT), intensively optimized to generate exceptional operating features is presented. This sensor is designed to target human interleukin-2 (IL-2) in synthetic human serum. IL-2 is a regulatory protein released as a triggered response from the immune system towards an inflammation.For this purpose, cadmium telluride (CdTe) QDs are prepared with 3-mercaptopropionic acid (MPA) and modified afterwards to produce an IL-2 imprinted polymer with methacrylic acid and N,N´-methylenebis(acrylamide), upon removal of the template under optimized conditions. During IL-2 rebinding, the fluorescence intensity of CdTe@MPA QDs is quenched in a concentration dependent manner. Using surface imprinting technology, the optimal fluorescence signals yielded a linear response versus logarithm of IL-2 concentration from 35 fg/ml to 39 pg/ml, in a 1000-fold diluted synthetic human serum. The limit of detection obtained is 5.91 fg/ml, lying below the concentration levels of IL-2 with clinical interest for cancer diagnosis (9.4-19.2 pg/ ml).Overall, the method presented herein is a demonstration that the combination of MIP and QDs for protein detection constitutes a powerful tool in clinical analysis, providing low cost, sensitive and quick responses. The same concept may be further extended to other proteins of interest.

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Section: Tga Analysismentioning

confidence: 99%

Label-free quantum dot conjugates for human protein IL-2 based on molecularly imprinted polymers

Piloto

Ribeiro

Rodrigues

et al. 2020

Sensors and Actuators B: Chemical

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“…Solvatation of the salts can affect the interactions between the copolymer and water and therefore the hydration of the copolymer hydrogel decreases. In addition, the decreasing of the hydration could be explained by the nature of the cation (Li + , Na + and K + ) that can interact with the functional groups of polymer inducing a saturation in the internal network and increasing the repulsion forces between the aqueous solution and the hydrogel [26].…”

Section: Effect Of Interfering Salts On Hydration Capacitymentioning

confidence: 99%

“…Polymeric hydrogels can be modified chemically improving physicochemical and thermomechanical properties as well as the stability of the material. In dry state they are a resilient solid known as xerogel, but when they make contact with an aqueous medium they swell until reaching a physicochemical equilibrium, becoming elastic or soft solids known as hydrogels [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Hydrogels Based on 2-Hydroxyethyl Methacrylate: Synthesis, Characterization and Hydration Capacity

Oyarce

Pizarro

Oyarzún

et al. 2020

J. Chil. Chem. Soc.

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In the present work, three hydrogels of poly(2-hydroxyethyl methacrylate-co-itaconic acid), p(HEMA-co-IA), poly(2-hydroxyethyl methacrylate-co-acrylic acid), p(HEMA-co-AA) and poly(2-hydroxyethyl methacrylate-co-(1-vinyl-2-pyrrolidone)), p(HEMA-co-NVP) were prepared by free radical polymerization in aqueous solution (1:1 monomer mole ratio) using ammonium persulfate as initiator and N,N´-methylenebisacrylamide as crosslinking agent at two different amount (0.3 and 0.9 mol%). The obtained hydrogels were characterized by Fourier transform infrared spectroscopy (FT-IR), which allowed to verify the structural composition. Thermal analysis of the hydrogels was carried out by thermogravimetric analysis (TGA). In addition, hydration capacity (U%) was studied at different experimental conditions such as: time, pH, concentrations of interfering salts (KCl, NaCl and LiCl). The results showed a good polymerization yield (95%). FTIR characterization shows the absorption bands of the functional groups of copolymers. TGA exhibited the characteristic thermal stability of this type of hydrogels. The presence of comonomer AI, AA or NVP in copolymer determine the thermal behavior. Hydration experiments revealed a higher U% in copolymer containing more carboxylic acid groups. The maximum U% values in water were 400% and 250% for p(HEMA-co-AI) and p(HEMA-co-AA), respectively. For P(HEMA-co-NVP) a maximum of U% value was only 74% in water. The effect of interferent salts affects the hydration capacity decreasing U% when the concentration of salts increase.

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“…Hydrogels have a distinct three-dimensional structure and although they have a high water content, hydrogels are water-insoluble due to the crosslinked (physical or chemical) structure of the steric or crystalline linkages. The hydrogel swells when it comes into contact with the aqueous solution (Pooley et al, 2010). Hydrogels can be obtained by two major mechanisms: hydrogels with covalent or irreversible links and hydrogels with reversible or physical links.…”

Section: Introductionmentioning

confidence: 99%

Research on the Hydrolysis of Hide Waste in the Presence of Natural Polymers

Zainescu¹,

Hanu²,

Constantinescu³

et al. 2016

The International Conference on Advanced Materials and Systems

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Like other industries, the leather processing industry is forced to face high costs for waste treatment and disposal. Consequently, researchers are seeking solutions for effective recovery of organic waste from tanneries through various biochemical treatments in order to obtain protein biofertilizers. The novelty is based primarily on the fact that the starting point of the promoted technologies is the development of new complex products obtained by processing organic waste, called hydrogels with collagen structure, with applications in agriculture. This paper presents an innovative process for the biochemical degradation of pelt waste in order to obtain encapsulated protein biocomposites to be used as fertilizers for poor soils and for plant growth. The proposed method consists in the treatment of raw hide waste by direct hydrolysis of protein waste in an acidic environment, in combination with other polymers (polyacrylamide, starch, urea, acrylic, maleic, cellulose, etc.), thus obtaining hydrogels with collagen structure. For this purpose natural sources of protein are enriched by the addition of macro-and/or micronutrients, resulting in compounded complex systems, namely protein hydrogels. Following experiments it can be concluded that direct hydrolysis of a protein source in the presence of natural or synthetic polymers results in hydrogels with collagen structure to improve soil quality and horticulture.

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Hydrogels From Acrylic Acid With N,n-Dimethylacrylamide: Synthesis, Characterization, and Water Absorption Properties

Cited by 27 publications

References 19 publications

Label-free quantum dot conjugates for human protein IL-2 based on molecularly imprinted polymers

Label-free quantum dot conjugates for human protein IL-2 based on molecularly imprinted polymers

Hydrogels Based on 2-Hydroxyethyl Methacrylate: Synthesis, Characterization and Hydration Capacity

Research on the Hydrolysis of Hide Waste in the Presence of Natural Polymers

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