Chitosan and guar gum composite films: Preparation, physical, mechanical and antimicrobial properties

Rao, M.S.; Kanatt, Sweetie R.; Chawla, S.P.; Sharma, Arun

doi:10.1016/j.carbpol.2010.06.058

Cited by 248 publications

(143 citation statements)

References 24 publications

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“…The results obtained in this work for the color and opacity of Ch-G membranes differ from those reported by Rao et al (2010), who obtained chitosan and guar gum membranes with lower opacity (15.91 ± 0.52%) and yellowish-green color with greater intensity (Hue = -57.76 and Chroma = 6.79). This difference may be attributed to the different method of preparation of the membranes used by Rao et al (2010), which did not include the neutralization step. In the present work, it was precisely at this step that the color of Ch-G membranes changed to a noticeably yellowish.…”

Section: Visual Aspect and Morphologycontrasting

confidence: 56%

“…The existence of the neutralization step in the process of membrane production is important because it avoids potential dissolution of chitosan in aqueous solutions such as body fluids and, moreover, eliminates the irritating effect that the membrane could present when in contact with the lesion due to residual acetic acid. The difference of opacity may be related to the fact that the membranes obtained by Rao et al (2010) had a thickness about 2.5 times lower than those described in the present study (data not shown). Greater film thickness results in higher difficulty of light to pass through it, since the amount of material present therein is increased.…”

Section: Visual Aspect and Morphologycontrasting

confidence: 52%

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Incorporation and Release Kinetics of Alpha-Bisabolol From PCL and Chitosan/Guar Gum Membranes

Souza

Moraes

2016

Braz. J. Chem. Eng.

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-Alpha-bisabolol, an anti-inflammatory and antioxidant compound extracted from candeia trees (Eremanthus erythropappus), was incorporated into hydrophobic polycaprolactone (PCL) and hydrophilic chitosan/guar gum (Ch-G) membranes aiming at the production of bioactive wound dressings. The incorporation efficiency achieved a maximum of ca. 18% (1 gram of alpha-bisabolol per gram of membrane) for Ch-G membranes. For PCL membranes, all of the active compound added was retained (0.2 gram of alpha-bisabolol per gram of membrane). Alpha-bisabolol release in phosphate-buffered saline was relatively slow in both cases, reaching around 6% and 24% after 120 hours respectively for PCL and Ch-G membranes presenting equivalent initial alpha-bisabolol/membrane mass ratios. Both formulations were capable of releasing alpha-bisabolol in the typically recommended topical dose range (from 1 to 10 grams of alphabisabolol per gram of vehicle). The extended release periods observed are advantageous, allowing less frequent dressing changes and contributing to turn the treatment more comfortable for the patient.

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Section: Visual Aspect and Morphologycontrasting

confidence: 56%

Section: Visual Aspect and Morphologycontrasting

confidence: 52%

Incorporation and Release Kinetics of Alpha-Bisabolol From PCL and Chitosan/Guar Gum Membranes

Souza

Moraes

2016

Braz. J. Chem. Eng.

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“…The samples with air bubbles, nicks or tears and having mean thickness variation of greater that 5 % were excluded from analysis [37].…”

Section: Thickness Measurementmentioning

confidence: 99%

Antimicrobial and in vitro wound healing properties of novel clay based bionanocomposite films

Mishra

Ramasamy

Lim

et al. 2014

J Mater Sci: Mater Med

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The present study investigates the development of methyl cellulose (MC)-sodium alginate (SA)-montmorillonite (MMT) clay based bionanocomposite films with interesting wound healing properties. The differential scanning calorimetry analysis of the composite films revealed presence of single glass transition temperature (Tg) confirming the miscible nature of the ternary blended films. The increase in MMT ratio in the composite films reduced the mobility of biopolymer chains (MC/SA) which increased the Tg of the film. Thermogravimetric analysis showed that dispersion of clay (MMT) at nano level significantly delayed the weight loss that correlated with higher thermal stability of the composite films. It was observed that the developed films were able to exhibit antimicrobial activity against four typical pathogenic bacteria found in the presence of wound. The developed films were able to significantly inhibit (10 mg/ml) the growth of Enterococcus faecium and Pseudomonas aeruginosa. In vitro scratch assay indicated potential wound closure activities of MC-2-4 bionanocomposite films at their respective highest subtoxic doses. In conclusion, these ternary bionanocomposite films were found to be promising systems for wound healing applications.

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“…Sugere-se que a presença da galactose na estrutura da goma guar seja a responsável por tal fenômeno. Entretanto, outros autores já mencionaram que a goma guar aumenta a opacidade de filmes e geis sem mencionar tal afirmação (RAO et al, 2010;BEM;POLESI;SARMENTO, 2011). 5 7 9 12 T1 40,21…”

Section: Corunclassified

Conservação de mamão minimamente processado com uso de revestimento comestível à base de goma xantana

et al. 2013

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ResumoNeste trabalho foi avaliada a conservação do mamão "Formosa" minimamente processado, com o uso de revestimento comestível à base de goma xantana, por 12 dias a 4±1 °C. Foram realizados os tratamentos: controle (T1), sem revestimento; revestimento com 0,5% de goma xantana (T2); revestimento com 0,5% de goma xantana e 1% de quitosana (T3); revestimento com 0,5% de goma xantana e 0,25% de goma guar (T4); revestimento com 0,5% de goma xantana, 0,25% de goma guar e 1% de quitosana (T5). Tais revestimentos foram preparados em solução aquosa e adicionados a eles 1% do plastificante glicerol. No tratamento controle e nos pedaços de mamão revestidos foram analisados a perda de massa, firmeza, pH, acidez titulável cor e os seguintes grupos de micro-organismos: psicrófilos, Salmonella spp., coliformes totais e termotolerantes. Os diferentes revestimentos à base de goma xantana foram eficientes na conservação do mamão "Formosa" minimamente processado, em relação à amostra controle. A adição de goma guar ao revestimento de xantana influenciou negativamente na perda de massa e nos parâmetros de cor, luminosidade, a* e b*. A adição de quitosana (T3) influenciou beneficamente na redução da perda de massa, manutenção da luminosidade e menor redução nos parâmetros a* e b*, entretanto, não foi observado efeito antimicrobiano. Assim, sugere-se como revestimento comestível de mamão "Formosa" minimamente processado o revestimento composto somente de goma xantana (T2), o qual propiciou redução da perda de massa, manutenção da luminosidade e b* e menor redução no a*. Entretanto, experimentos visando à manutenção da firmeza, pH e acidez deverão ser futuramente realizados. Palavras-chave: Análise microbiológica, Carica papaya, cor, goma guar, perda de massa, quitosana, textura AbstractThe objective of this study was to evaluate the preservation of papaya minimally processed by the use of edible coatings based on xanthan gum for 12 days at 4±1 °C. Different treatments were performed: control (T1) uncoated; 1 % glycerol and 0.5 % xanthan gum (T2); 1 % glycerol, 0.5 % xanthan gum and 1 % chitosan (T3); 1 % glycerol, 0.5 % xanthan gum and 0.25 % guar gum (T4); 1 % glycerol, 0.5 % xanthan gum, 0.25 % guar gum and 1 % chitosan (T5). Such coatings were prepared in aqueous solution and added to them 1% glycerol. In the control treatment and the coated pieces of papaya were analyzed weight loss, firmness, pH, titratable acidity, color, and microbiological groups: psychrophilic, Salmonella spp., total coliform and thermotolerant. The different coatings based on xanthan gum were

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Chitosan and guar gum composite films: Preparation, physical, mechanical and antimicrobial properties

Cited by 248 publications

References 24 publications

Incorporation and Release Kinetics of Alpha-Bisabolol From PCL and Chitosan/Guar Gum Membranes

Incorporation and Release Kinetics of Alpha-Bisabolol From PCL and Chitosan/Guar Gum Membranes

Antimicrobial and in vitro wound healing properties of novel clay based bionanocomposite films

Conservação de mamão minimamente processado com uso de revestimento comestível à base de goma xantana

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