Thermal behavior of galactomannan guar gum and its periodate oxidation products

Varma, A.J.; Kokane, S.P.; Pathak, Gopal; Pradhan, Sayantan

doi:10.1016/s0144-8617(96)00155-5

Cited by 48 publications

(24 citation statements)

References 12 publications

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“…The inability to detect aldehydes on carbohydrates has been reported before. For example, Varma et al (1997) could not detect the aldehydes on dialdehyde guar. The explanation is that the aldehydes are converted to hemiacetals by reaction with neighboring alcohol groups on cellulose.…”

Section: Discussionmentioning

confidence: 99%

The role of mild TEMPO–NaBr–NaClO oxidation on the wet adhesion of regenerated cellulose membranes with polyvinylamine

DiFlavio

Pelton

Leduc³

et al. 2006

Cellulose

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X-ray Photoelectron Spectroscopy (XPS) was used to characterize the functional groups present on regenerated cellulose films after mild oxidation with TEMPO-NaBr-NaClO and the results were correlated with the adhesion forces holding together two wet cellulose films laminated with a thin (i.e. less than 10 mg/m 2 ) layer of polyvinylamine (PVAm). There was no correlation between adhesion and carboxyl content, whereas wet adhesion was proportional to the total content of aldehyde and hemiacetal groups on the cellulose. It is proposed that aldehyde groups react with neighboring cellulose chains to form hemiacetals which serve as crosslinks strengthening the cellulose surface. The hemiacetals can also be attacked by primary amines to give imine and aminal covalent linkages to the PVAm adhesive layer.

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Section: Discussionmentioning

confidence: 99%

The role of mild TEMPO–NaBr–NaClO oxidation on the wet adhesion of regenerated cellulose membranes with polyvinylamine

DiFlavio

Pelton

Leduc³

et al. 2006

Cellulose

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“…The early minor weight loss in samples is attributed to the loss of adsorbed and structural water of biopolymers as explained by other authors (Vendruscolo et al, 2009;Kittur et al, 2002), or due to desorption of moisture as hydrogen bound water to the saccharide structure. The second weight loss event may be attributed to the polysaccharide decomposition (Zohuriaan, Shokrolahi 2004;Varma et al, 1997) and is described by a weight loss. The weight loss onset representing the onset of oxidation or decomposition of polymer suggests that mucilage's have good thermal stability.…”

Section: Thermogravimetry Analysismentioning

confidence: 99%

Physico-chemical and structural characterization of mucilage isolated from seeds of Diospyros melonoxylon Roxb.

Singh¹,

Bothara²

2014

Braz. J. Pharm. Sci.

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Mucilage was isolated from the seeds of Diospyros melonoxylonRoxb., a plant growing naturally in the forests of India. Various physico-chemical methods like particle analysis, scanning electron microscopy, differential scanning calorimetry, differential thermal analysis, thermogravimetry analysis, molecular weight by gel permeation chromatography, rheometry, elemental analysis, x-ray diffraction spectrometry, zeta potential, fourier transform infrared spectroscopy, 1D(1H and 13C) (NMR) have been employed to characterize this gum in the present study. Particle analyses suggest that mucilage had particle size in nanometer. SEM analysis suggested that the mucilage had irregular particle size. The glass transition temperature of the gum observed was 78 °C and 74 °C by DSC and DTA respectively. The Thermogravimetry analysis suggested that mucilage had good thermal stability with two stage decomposition. The molecular weight of mucilage was determined to be 8760, by gel permeation chromatography, while the viscosity of mucilage was observed to be 219.1 cP. The XRD pattern of the mucilage indicated a complete amorphous nature. Elemental analysis of the gum revealed specific contents of carbon, hydrogen, nitrogen and sulfur. The major functional groups identified from FT-IR spectrum include 3441 cm-1 (-OH), 1632 cm-1 (-COO-), 1414 cm-1 (-COO-) and 1219 cm-1 (-CH3CO). Analysis of mucilage by paper chromatography and 1D NMR indicated the presence of sugars.

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“…Due to the possible transformation of aldehydes in hemiacetals, [25] no signal at about 200 ppm, ascribable to an aldehydic group, is observed.…”

Section: Cp-mas Nmr Analysismentioning

confidence: 99%

NMR structural study of hydrogels based on partially deacetylated hyaluronan

et al. 2002

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Thermal behavior of galactomannan guar gum and its periodate oxidation products

Cited by 48 publications

References 12 publications

The role of mild TEMPO–NaBr–NaClO oxidation on the wet adhesion of regenerated cellulose membranes with polyvinylamine

The role of mild TEMPO–NaBr–NaClO oxidation on the wet adhesion of regenerated cellulose membranes with polyvinylamine

Physico-chemical and structural characterization of mucilage isolated from seeds of Diospyros melonoxylon Roxb.

NMR structural study of hydrogels based on partially deacetylated hyaluronan

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