Characterization of xanthan gum produced from sugar cane broth

Faria, Sandra; Petkowicz, Carmen Lúcia de Oliveira; Morais, Sérgio Antônio Lemos de; Terrones, Manuel Gonzalo Hernandez; Resende, Miriam Maria de; França, Francisca Pessôa de; Cardoso, Vicelma Luiz

doi:10.1016/j.carbpol.2011.04.063

Cited by 213 publications

(82 citation statements)

References 30 publications

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“…XG presented two carbonyl peaks at ν c = o = 1733 cm −1 corresponding to acetate and pyruvate groups and at ν c = o = 1618 cm −1 characteristic of carboxylate groups. These results are in agreement with reported data [13,17]. In comparison with peaks at ν c = o = 1618 cm −1 , PX samples exhibit highly enhanced absorption at ν c = o = 1733 cm −1 because of the newly generated ester bonds and carboxylic acid groups.…”

Section: Rheological Measurementssupporting

confidence: 95%

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Synthesis and characterization of modified xanthan gum using poly(maleic anhydride/1-octadecene)

et al. 2016

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In this study, modified xanthan gum was prepared by esterification of xanthan gum (XG) with poly(maleic anhydride/1-octadecene) (PMAO) in order to improve the shearing and thermal degradation performance. The structure and molecular weight (M w ) of the modified xanthan gums (named as PX) and XG were characterized by FT-IR, 1 H NMR, and static light scattering. The radius of gyration (R g ) and hydrodynamic radius (R h ) of these polymers in aqueous solution were obtained by light scattering measurement. From thermal gravimetric analysis (TGA) measurements, PX and XG have similar thermal stability. According to rheological determinations, PX exhibits a more outstanding property of resistance to shear force and displays highly enhanced viscoelastic behaviors. Also, it is found that PX solution has better performance on salt tolerance and temperature resistance due to the crosslinkage between XG and PMAO. In addition, the mechanical shear degradation and thermal degradation data show that PX solution keeps higher viscosity than XG.

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Section: Rheological Measurementssupporting

confidence: 95%

“…These dipole interactions result in an enlargement of the resonance line [13,17,18]. Thus, 1 H NMR spectra with low resolution were detected at 25°C, but that does not prevent comparison between samples.…”

Section: H Nmr Spectramentioning

confidence: 98%

Synthesis and characterization of modified xanthan gum using poly(maleic anhydride/1-octadecene)

et al. 2016

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“…The ratio of components glucose, mannose and glucuronic acid obtained in the present study was 2.25: 2.83: 1. The ratio of these components (glucose, mannose and glucuronic acid) in the xanthan gum obtained by Rosalam and England [24] was 2: 2: 1 and Faria et al [12] was 1.79: 1:33: 1. The ratios different found in this paper.…”

Section: Characterization Of the Formed Goma: Determination Of Monosamentioning

confidence: 99%

“…Figure 6 shows the behavior of viscosity of the gum as a function of shear rate for different gum concentrations (0.5, 0.75 and 1%). According to Faria et al [12] , an important feature of biopolymers is their ability to cause thickening at a given concentration, generally less than 1% (w/v), promoting higher viscosities to the known strain rates.…”

Section: Biopolymer Production In Fermentermentioning

confidence: 99%

“…The rheology of gum was obtained by preparing a polymer solution of 0.5%, 0.75% and 1% under magnetic stirring for approximately 10 h. The gum used to prepare this solution was dried at room temperature, and then crushed and hydrated [10,12] .The rheology was measured using a Brookfield rheometer RVDVIII coupled with a water bath mark Brookfield, model TC-502P, using the small sample adapter, spindle 18. Following the template Ostwald Waele or power-law, data on shear stress, measured from shear rates, were used.…”

Section: Evaluation Of Rheological Behavior Of the Biopolymermentioning

confidence: 99%

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Biopolymer production using fungus Mucor racemosus Fresenius and glycerol as substrate

et al. 2016

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SbstractThis study evaluated extracellular production of biopolymer using fungus Mucor racemosus Fresenius and glycerol as a carbon source. Initially employing conical flasks of 500 mL containing 100 mL of cultive medium with 0.18 ± 0.03 g.L -1 of microorganisms, the results showed that the best conditions of the variables studied were: initial concentration of glycerol 50 g.L gum formed and 75% glycerol consumption. These conditions produced a biopolymer with the molecular weight and total sugar content of 4.607×10 6 g.mol -1 (Da) and 89.5%, respectively.

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