Growth of 4,4′-dihydroxyazobenzene (DHAB) and its characterization

Babu, R. Ramesh; Kumaresan, S.; Vijayan, N.; Gunasekaran, M.; Kannan, Piskala Subburaman; Ramasamy, P.

doi:10.1016/s0022-0248(03)01369-1

Cited by 30 publications

(3 citation statements)

References 11 publications

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“…Spectra of the lyophilised nanospheres and native nents were obtained and are presented in Figure 5a,b. Characteristic bands and p seen at 828 cm −1 verifying the 4,4′ distribution in the ring [29], the strong absor 1231 cm −1 assigned to the aromatic C-O stretch, 1508 cm −1 assigned to the azo gro N) responsible for photo-responsiveness of the system, aromatic C-N, C = C and C sitioned at 1381 cm −1 ,1438 cm −1 and 2925 cm −1 , respectively. Amide C = O stretchin at 1634 cm −1 , was accounted for by the structure of zein.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 69%

Fabrication and Characterisation of a Photo-Responsive, Injectable Nanosystem for Sustained Delivery of Macromolecules

Mahlumba

Kumar

Toit

et al. 2021

IJMS

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The demand for biodegradable sustained release carriers with minimally invasive and less frequent administration properties for therapeutic proteins and peptides has increased over the years. The purpose of achieving sustained minimally invasive and site-specific delivery of macromolecules led to the investigation of a photo-responsive delivery system. This research explored a biodegradable prolamin, zein, modified with an azo dye (DHAB) to synthesize photo-responsive azoprolamin (AZP) nanospheres loaded with Immunoglobulin G (IgG). AZP nanospheres were incorporated in a hyaluronic acid (HA) hydrogel to develop a novel injectable photo-responsive nanosystem (HA-NSP) as a potential approach for the treatment of chorio-retinal diseases such as age-related macular degeneration (AMD) and diabetic retinopathy. AZP nanospheres were prepared via coacervation technique, dispersed in HA hydrogel and characterised via infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Size and morphology were studied via scanning electron microscopy (SEM) and dynamic light scattering (DLS), UV spectroscopy for photo-responsiveness. Rheological properties and injectability were investigated, as well as cytotoxicity effect on HRPE cell lines. Particle size obtained was <200 nm and photo-responsiveness to UV = 365 nm by decreasing particle diameter to 94 nm was confirmed by DLS. Encapsulation efficiency of the optimised nanospheres was 85% and IgG was released over 32 days up to 60%. Injectability of HA-NSP was confirmed with maximum force 10 N required and shear-thinning behaviour observed in rheology studies. In vitro cell cytotoxicity effect of both NSPs and HA-NSP showed non-cytotoxicity with relative cell viability of ≥80%. A biocompatible, biodegradable injectable photo-responsive nanosystem for sustained release of macromolecular IgG was successfully developed.

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Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 69%

Fabrication and Characterisation of a Photo-Responsive, Injectable Nanosystem for Sustained Delivery of Macromolecules

Mahlumba

Kumar

Toit

et al. 2021

IJMS

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“…The characteristic peaks at 1580 and 1496 cm –1 can be attributed to vibrations of the benzene ring. The peak at 1604 cm –1 should be assigned to the asymmetric stretching vibration of the NN bond . The characteristic peak at 1295 cm –1 belongs to the aromatic–nitrogen bond .…”

Section: Resultsmentioning

confidence: 99%

Dual Fire Retardant Action: The Combined Gas and Condensed Phase Effects of Azo-Modified NiZnAl Layered Double Hydroxide on Intumescent Polypropylene

Wang

Liao

et al. 2017

Ind. Eng. Chem. Res.

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Ternary nickel-substituted layered double hydroxide (C-LDH) was synthesized. It was intercalated with azobenzene-4,4'-dicarboxylic acid, using an ion exchange method to obtain organically modified NiZnAl-LDH (O-LDH). Both LDHs were melt-blended into polypropylene (PP) with intumescent fire retardant (IFR). The structure, morphology, thermal stability and combustible properties of intercalated LDH and its hybrid composite have been comprehensively characterized. SEM and EDX mapping show O-LDH exhibits better dispersion than ZnNiAl-CO3 LDH (C-LDH). Cone calorimetry shows the addition of IFR and LDH significantly reduced smoke and heat release rate. The composite with 1 wt% O-LDH, which showed dual gas phase and condensed phase fire retardant action, exhibited the lowest flammability with an LOI value of 29.3 % and achieved a UL-94 V-0 rating. In addition, incorporation of LDH improved the mechanical properties compared to PP/IFR composites. UV absorption showed that O-LDH could significantly improve the ultraviolet stability of PP composites.

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“…m p : 215–218 °C. FT-IR (KBr, cm –1 ): 3457 (−OH), 3199 (C–H, benzene aromatic ring), 1506 (ring skeletal vibrations), 1590 (NN), 1250 (C–O), 844 (para-substituted aromatic rings) …”

Section: Experimental Sectionmentioning

confidence: 99%

Photo-Switchable Nanomechanical Systems Comprising a Nanocontainer (Montmorillonite) and Light-Driven Molecular Jack (Azobenzene-Imidazolium Ionic Liquids) as Drug Delivery Systems; Synthesis, Characterization, and in Vitro Release Studies

Rafi

Hamidi

Bashir‐Hashemi

et al. 2017

ACS Biomater. Sci. Eng.

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Growth of 4,4′-dihydroxyazobenzene (DHAB) and its characterization

Cited by 30 publications

References 11 publications

Fabrication and Characterisation of a Photo-Responsive, Injectable Nanosystem for Sustained Delivery of Macromolecules

Fabrication and Characterisation of a Photo-Responsive, Injectable Nanosystem for Sustained Delivery of Macromolecules

Dual Fire Retardant Action: The Combined Gas and Condensed Phase Effects of Azo-Modified NiZnAl Layered Double Hydroxide on Intumescent Polypropylene

Photo-Switchable Nanomechanical Systems Comprising a Nanocontainer (Montmorillonite) and Light-Driven Molecular Jack (Azobenzene-Imidazolium Ionic Liquids) as Drug Delivery Systems; Synthesis, Characterization, and in Vitro Release Studies

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