Reactions of the synthesis of azo dyes in solidified gelatin gel and their analytical application in the determination of nitrites

Sheremet’ev, S. V.; Кузнецов, В. В.

doi:10.1134/s1061934807040041

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…6 Gelatin layers of photographic films were used as a medium for carrying out reactions of different types. 16,[21][22][23][24][25][26] Gelatin is actually a polydisperse mixture of low-molecular polypeptides; 22 the molecules are pronouncedly anisotropic and asymmetric. In fact, the polymer contains a voluminous net of charges and some amount of free ions.…”

Section: Introductionmentioning

confidence: 99%

Protolytic properties of dyes embedded in gelatin films

Никитина¹,

Reshetnyak²,

Svetlova³

et al. 2011

J. Braz. Chem. Soc.

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O filme de gelatina endurecida fixo em uma base transparente de triacetilcelulose pode ser utilizado como um suporte conveniente para indicadores ácido-base. Azul de bromofenol, verde de bromocresol, eosina, etil-eosina, n-decil-eosina, n-decil-fluoresceína, vermelho neutro e verde de malaquita foram incorporados nos filmes de gelatina por extração em meio aquoso sob condições apropriadas. A absorção de luz dos filmes dopados com corante exibe uma resposta ao pH de soluções tampão aquosas nas quais foram imersos. Valores reprodutíveis das constantes aparentes de dissociação dos indicadores, pK a app , foram calculados pelo tratamento convencional dos valores de pH do tampão aquoso e também para a água absorvida nos filmes de gelatina. Os experimentos com pH abaixo e acima do ponto isoelétrico da gelatina (em torno de pH 5) resultaram em valores de pK a app semelhantes àqueles em meios micelares de tensoativos catiônicos e aniônicos, respectivamente. Os filmes de gelatina modificados por corantes podem ser recomendados para uso em sensores óticos e dispositivos similares.The hardened gelatin film fixed on the transparent triacetylcellulose support can be utilized as a convenient carrier for acid-base indicator dyes. Bromophenol blue, bromocresol green, eosin, ethyleosin, n-decyleosin, n-decylfluorescein, neutral red, and malachite green were embedded into the gelatin films by extracting from aqueous media under appropriate conditions. The light absorption of dye-doped films exhibits a response to the pH values of aqueous buffer solutions, where they were soaked in. The well-reproducible indices of the apparent ionization constants, pK a app , of the indicators were calculated by conventional equating the pH values of the bulk aqueous buffer and those of the 'internal' water into the gelatin films. The experiments with pH below and above the isoelectric point of gelatin (around pH 5) result in pK a app values, which resemble those in micellar media of cationic and anionic surfactants, respectively. The dye-modified gelatin films can be recommended for use in optical sensors and related devices. Keywords: dye-modified gelatin film, indicators, apparent ionization constants, medium effects IntroductionThis paper is devoted to the influence of hardened gelatin media on the spectral and acid-base properties of immobilized xanthene, sulfonephthalein, and some other dyes.The immobilization of reagents in solid matrix (cellulose, ion-exchangers, polymers, silica, xerogels, etc.) 1-7 or using organized solutions, e.g., surfactant-based ones, [8][9][10][11][12] modifies the properties of guest molecules owing to the change of the microenvironment.Such modifications, or medium effects, are most studied and well documented for acid-base indicators. 8,9 In this case, the influence of the microenvironment results in the shift of the indicator equilibrium as compared to that in aqueous media. The main reasons are the local polarity and the local electrical charge. The latter often (but not always) manifests itself in the decre...

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Section: Introductionmentioning

confidence: 99%

Protolytic properties of dyes embedded in gelatin films

Никитина¹,

Reshetnyak²,

Svetlova³

et al. 2011

J. Braz. Chem. Soc.

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show abstract

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Over the past decade, there has been a number of articles and patents detailing the use of azo dyes as sensors. [10][11][12][13][14][15][16][17][18][19]21,22] Azo dye sensor materials are reported for the detection of pH, metals, and organic molecules such as nitriles, aldehydes, alcohols, and amines. [12,13,15,16] Generally, these materials are comprised of an azo dye suspended or doped in a polymeric material or spin coated onto a substrate.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19]21,22] Azo dye sensor materials are reported for the detection of pH, metals, and organic molecules such as nitriles, aldehydes, alcohols, and amines. [12,13,15,16] Generally, these materials are comprised of an azo dye suspended or doped in a polymeric material or spin coated onto a substrate. [21][22][23] However, certain substrates (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis and properties of azo dye based polymers has drawn a considerable amount of attention due to their applications as reversible optical storage media, chiroptical switches, electrooptic modulators, and chemical sensors 1–20. Over the past decade, there has been a number of articles and patents detailing the use of azo dyes as sensors 10–19, 21, 22. Azo dye sensor materials are reported for the detection of pH, metals, and organic molecules such as nitriles, aldehydes, alcohols, and amines 12, 13, 15, 16.…”

Section: Introductionmentioning

confidence: 99%

“…Hz, 1H) 13. C { 1 H} NMR (DMSO-d 6 ): d ¼ 14.7, 39.3, 54.2, 58.3, 63.8, 105.7, 112.1, 116.1, 124.2, 135.0, 141.7, 146.8, 153.8, 157.6, 174.3.…”

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Homo‐ and Co‐Polymers of Norbornene Containing Aryl‐ and Hetaryl‐Azo Dyes; Synthesis and Sensing Properties

Abd‐El‐Aziz

Shipman

Shipley

et al. 2009

Macro Chemistry & Physics

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A series of polynorbornene homo‐ and copolymers containing aryl‐ and/or hetaryl‐azo dyes were prepared through ring‐opening metathesis polymerization (ROMP). Thermal studies indicated that the polymers were thermally stable up to 250 °C, and possessed glass transition temperatures ranging from 93 to 133 °C. In THF solutions, the aryl‐azo dye containing homopolymers, displayed λmax = 417 nm while the hetaryl‐azo dye containing homopolymers displayed λmax = 495 nm. The copolymers displayed a λmax that encompassed both the aryl‐ and hetaryl‐azo dye range. The monomers and polymers showed bathochromic shifts in solution when acidified. The polymers were cast into films that changed colour in the presence of both aqueous 1.2 M HCl or HCl(g). The colour change reverses when exposed to aqueous 1.2 M NaOH or NH3(g). This process was repeated several times without disintegration of the polymer film, indicating that these polymers may be useful as reusable acid sensors.

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Test films for test-determinations on the base of reagents, immobilized in gelatinous gel

Loginova

Konovalova

2008

Talanta

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Reactions of the synthesis of azo dyes in solidified gelatin gel and their analytical application in the determination of nitrites

Cited by 4 publications

References 3 publications

Protolytic properties of dyes embedded in gelatin films

Protolytic properties of dyes embedded in gelatin films

Homo‐ and Co‐Polymers of Norbornene Containing Aryl‐ and Hetaryl‐Azo Dyes; Synthesis and Sensing Properties

Test films for test-determinations on the base of reagents, immobilized in gelatinous gel

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