Conjugation of insulin-mimetic [meso-tetrakis(4-sulfonatophenyl)porphyrinato]zinc(II) with chitosan in aqueous solution: kinetics, equilibrium and thermodynamics

Pervin, Shaila; Shaha, Chironjit Kumar; Karmaker, Subarna; Saha, Tapan Kumar

doi:10.1007/s00289-020-03331-z

Cited by 7 publications

(34 citation statements)

References 48 publications

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“…The characteristic peak of chitosan at 287 nm (Figure a) was moved to 295 nm in the complex (Figure c). Consequently, the 8 nm bathochromic shift of the chitosan characteristic peak was attributed to conjugate formation in an aqueous environment . In VO(tpps), the soret band appeared at 436 nm (Figure b), whereas in the conjugate, it shifted to 413 nm (Figure c).…”

Section: Results and Discussionmentioning

confidence: 97%

“…A straightforward technique was used to conjugate VO(tpps) with chitosan in an aqueous medium without adding any cross-linking agent. Aqueous solution of VO(tpps) (4 μmol/L) was added to chitosan solution (1% w/v; pH 2.5) at 1:1 (v/v) ratio with continuous stirring to facilitate conjugation, which was evaluated by spectroscopically . The UV–vis absorption spectra of chitosan, VO(tpps), and chitosan-VO(tpps) complex in an aqueous medium are exhibited in Figure .…”

Section: Results and Discussionmentioning

confidence: 99%

“…By forming micelles, chitosan effectively protected Zn(tpps) in an acidic environ- ment from demetallization, as previously described. 34 It was also assumed that the cross-linked network of chitosan was responsible for Zn(tpps) segregation. The analogous mechanism may explain the stability of the chitosan-VO(tpps) conjugate in an acidic environment.…”

Section: Stability Of Conjugate Chitosan-vo(tpps)mentioning

confidence: 99%

“…Similar explanations for this phenomenon were previously reported. 34,55,56 Conjugation Isotherm. To predict the nature of the interaction between VO(tpps) and chitosan, bulk equilibrium data were tested with the most prevalent isotherm models.…”

Section: T H I S C O N T E N T Imentioning

confidence: 99%

“…Sample containers were removed from the water immersion at predetermined intervals, and the quantity of VO(tpps) conjugated with chitosan was determined spectrophotometrically using a UV-1900i Shimadzu spectrophotometer with a λ max value of 436 nm. 34 At 436 nm, the molar absorption coefficient of VO(tpps) in aqueous solution was determined to be 1.84 × 10 5 L/mol.cm. The extent of VO(tpps) conjugated with chitosan at any time t, q t (μmol/g) was calculated by using eq 20: (20) where C 0 (μmol/L) is the VO(tpps) concentration in solution at time zero, C t (μmol/L) represents the VO(tpps) concentration in outer membrane solution at time t, V (L) represents the solution volume, and m (g) represents the weight of chitosan.…”

Section: Synthesis Of Complex Vo(tpps)mentioning

confidence: 99%

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Kinetics, Equilibrium, and Thermodynamics for Conjugation of Chitosan with Insulin-Mimetic [meso-Tetrakis(4-sulfonatophenyl)porphyrinato]oxovanadate(IV)(4−) in an Aqueous Solution

Shaha,

Sarker,

Mahalanobish

et al. 2023

ACS Omega

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This study investigated the conjugation of chitosan with the insulin-mimetic [meso-tetrakis(4-sulfonatophenyl)porphyrinato]oxovanadate(IV)(4−), VO(tpps), in an aqueous medium as a function of conjugation time, VO(tpps) concentrations, and temperatures. To validate the synthesis of chitosan-VO(tpps) conjugate, UV−visible and Fourier transform infrared spectrophotometric techniques were utilized. Conjugate formation is ascribed to the electrostatic interaction between the NH 3 + units of chitosan and the SO 3 − units of VO(tpps). Chitosan enhances the stability of VO(tpps) in an aqueous medium (pH 2.5). VO(tpps) conjugation with chitosan was best explained by pseudo-second-order kinetic and Langmuir isotherm models based on kinetic and isotherm studies. The Langmuir equation determined that the maximal ability of VO(tpps) conjugated with each gram of chitosan was 39.22 μmol at a solution temperature of 45 °C. Activation energy and thermodynamic studies (E a : 8.78 kJ/mol, ΔG: −24.52 to −27.55 kJ/mol, ΔS: 204.22 J/(mol K), and ΔH: 37.30 kJ/mol) reveal that conjugation is endothermic and physical in nature. The discharge of VO(tpps) from conjugate was analyzed in freshly prepared 0.1 mol/L phosphate buffer (pH 7.4) at 37 °C. The release of VO(tpps) from the conjugate is a two-phase process best explained by the Higuchi model, according to a kinetic analysis of the release data. Taking into consideration all experimental findings, it is proposed that chitosan can be used to formulate both solid and liquid insulin-mimetic chitosan-VO(tpps) conjugates.

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Section: Results and Discussionmentioning

confidence: 97%

Section: Results and Discussionmentioning

confidence: 99%

Section: Stability Of Conjugate Chitosan-vo(tpps)mentioning

confidence: 99%

Section: T H I S C O N T E N T Imentioning

confidence: 99%

Section: Synthesis Of Complex Vo(tpps)mentioning

confidence: 99%

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Kinetics, Equilibrium, and Thermodynamics for Conjugation of Chitosan with Insulin-Mimetic [meso-Tetrakis(4-sulfonatophenyl)porphyrinato]oxovanadate(IV)(4−) in an Aqueous Solution

Shaha,

Sarker,

Mahalanobish

et al. 2023

ACS Omega

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A Supramolecular Polymer Network Based on Chitosan and Porphyrin and Its Application as an Adsorbent for Selective Removal of Dyes from Water

Cheng,

Liang,

Chao

et al. 2024

Advanced Sustainable Systems

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Environmentally friendly, high adsorption efficiency, and recyclable adsorbents meet the actual needs of organic dye wastewater treatment. Driven by noncovalent interactions between chitosan (CS) and 5,10,15,20‐tetra(4‐hydroxyphenyl) porphyrin sodium (THPPNa) under acidic conditions, a supramolecular polymer network is constructed. The supramolecular polymer network is applied as an excellent adsorbent for the removal of organic dyes from water with high efficiency. In addition, the supramolecular adsorbent shows excellent selectivity for the removal of organic anionic dyes from the mixtures of organic anionic and cationic dyes in water. Furthermore, the removal efficiency of anionic dyes of the network adsorbent keeps over 95% even after five adsorption–desorption cycles, indicating its reusability. This supramolecular polymer network shows its great potential as a low‐cost, effective, and selective adsorbent for removing organic dyes from water.

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Efficient adsorptive removal of levofloxacin using sulfonated graphene oxide: Adsorption behavior, kinetics, and thermodynamics

Shaha,

Karmaker,

Saha

2024

Heliyon

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Conjugation of insulin-mimetic [meso-tetrakis(4-sulfonatophenyl)porphyrinato]zinc(II) with chitosan in aqueous solution: kinetics, equilibrium and thermodynamics

Cited by 7 publications

References 48 publications

Kinetics, Equilibrium, and Thermodynamics for Conjugation of Chitosan with Insulin-Mimetic [meso-Tetrakis(4-sulfonatophenyl)porphyrinato]oxovanadate(IV)(4−) in an Aqueous Solution

Kinetics, Equilibrium, and Thermodynamics for Conjugation of Chitosan with Insulin-Mimetic [meso-Tetrakis(4-sulfonatophenyl)porphyrinato]oxovanadate(IV)(4−) in an Aqueous Solution

A Supramolecular Polymer Network Based on Chitosan and Porphyrin and Its Application as an Adsorbent for Selective Removal of Dyes from Water

Efficient adsorptive removal of levofloxacin using sulfonated graphene oxide: Adsorption behavior, kinetics, and thermodynamics

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