The use of DSC curves to determine the acetylation degree of chitin/chitosan samples

Guinesi, Luciana Simionatto; Cavalheiro, Éder Tadeu Gomes

doi:10.1016/j.tca.2006.03.003

Cited by 246 publications

(144 citation statements)

References 29 publications

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“…4b) was in reasonable agreement with the reported data (Bhumkar and Pokharkar, 2006;Guinesi and Cavalheiro, 2006;Kittur et al 2002). The thermogram of chitosan showed an endotherm at 127.41°C which could be attributed to the possible moisture content of the chitosan sample.…”

Section: Differential Scanning Calorimetrysupporting

confidence: 90%

“…The endotherm could be related to the pressure buildup because of water evaporation inside the pans (Kittur et al 2002). The second thermal event may be related to the decomposition of amine units with correspondent exothermic peak at around 325°C (Guinesi and Cavalheiro, 2006;Kittur et al 2002). The DSC thermogram of physical mixture of eugenol chitosan (Fig.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

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Unveiling the compatibility of eugenol with formulation excipients by systematic drug-excipient compatibility studies

et al. 2015

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Background: The drug-excipient compatibility studies were carried out with the possible excipients viz. Tween 80, Carbopol 940, chitosan, sodium alginate, and polycaprolactone (PCL) for their possible use in the formulation of eugenol loaded nanoemulsion gels and nanoparticles. Methods: The eugenol-excipient compatibility studies were carried out by visual observations, differential scanning calorimetry (DSC), infrared spectroscopy (FTIR), and high-performance thin-layer chromatography (HPTLC). Results: No notable change was observed in the samples on visual observation. From the results of the DSC studies, to a much extent, it was assumed that eugenol was not subjected to any interaction with the selected excipients for the proposed nanoemulsion gel and nanoparticles. But in some cases viz. polycaprolactone and Carbopol, though not to a significant level, slight deviation of the nature and position of the endothermic peaks of eugenol were observed. The results of the IR spectroscopy confirmed the compatibility of eugenol with Tween 80, Carbopol 940, chitosan, sodium alginate, and polycaprolactone. The retention factor of the HPTLC densitogram peaks for all the physical mixtures was well within the retention factor (R f ) value range observed for pure eugenol. Conclusions: The study results confirmed that eugenol is compatible with the selected excipients for the development of nanoemulsion gels and nanoparticles.

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Section: Differential Scanning Calorimetrysupporting

confidence: 90%

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Unveiling the compatibility of eugenol with formulation excipients by systematic drug-excipient compatibility studies

et al. 2015

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“…Signal's peak areas or heights have been used to estimate the DA. The data obtained from DSC were consistent with the DA determined by NMR techniques (Guinesi et al, 2006).…”

Section: Differential Scanning Calorimetry (Dsc)supporting

confidence: 81%

“…About 708C, an endothermic peak produced by the evaporation of absorbed water was found. Also, around 280-3008C, an exothermic peak is triggered by the decomposition of amine residues of chitosan chains (Ferna´ndez Cervera et al, 2004;Guinesi, Gomes, & Cavalheiro, 2006;Neto et al, 2005). This decomposition has two steps, the first one starts a random split of the glycoside bonds, and then acetic and butyric acid and short-chain fatty acids are formed (Lo´pez et al, 2008).…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Compilation of analytical methods to characterize and determine chitosan, and main applications of the polymer in food active packaging Recopilación de métodos analíticos para la caracterización y determinación del quitosano y las principales aplicaciones del polímero en los envases activos alimentarios

Lago

Quirós

Garcı́a

et al. 2011

CyTA - Journal of Food

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“…All analysis were performed at ambient temperature, 27°C, using 16 scan pulse accumulation and an LB parameter of 0.30 Hz. The spectral width was 20 ppm with 65 K data points (Guinesi & Cavalheiro 2006).…”

Section: Characterization Methodsmentioning

confidence: 99%

Modification of Chitosan for Preparation of Poly(N-isopropylacrylamide/ O-nitrochitosan Interpenetrating Polymer Network

Rahman¹,

Hanifah²,

Zani³

et al. 2015

JSM

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An interpenetrating polymer network (IPN), N-isopropylacrylamide/O-nitrochitosan (NONK) was developed in the presence Keywords: N-isopropylacrylamide(NIPAAm); nuclear magnetic resonance(NMR); O-nitrochitosan (ONK) ABSTRAK Polimer rangkaian saling menembus (IPN) N-isopropilakrilamida/O-nitrokitosan (NONK) telah dibangunkan dengan kehadiran amonium persulfat dengan menggunakan teknik pempolimeran larutan. O-nitrokitosan disintesis daripada kitosan terlebih dahulu sebelum ditindak balaskan dengan N-isopropilakrilamida. Satu getaran baru ikatan C-N terbentuk

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The use of DSC curves to determine the acetylation degree of chitin/chitosan samples

Cited by 246 publications

References 29 publications

Unveiling the compatibility of eugenol with formulation excipients by systematic drug-excipient compatibility studies

Unveiling the compatibility of eugenol with formulation excipients by systematic drug-excipient compatibility studies

Modification of Chitosan for Preparation of Poly(N-isopropylacrylamide/ O-nitrochitosan Interpenetrating Polymer Network

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