Properties and sorption studies of chitosan–polyvinyl alcohol blend films

Srinivasa, P.C.; Ramesh, M.N.; Kumar, K. R.; Tharanathan, R. N.

doi:10.1016/s0144-8617(03)00105-x

Cited by 240 publications

(119 citation statements)

References 14 publications

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“…At lower a w values, the slope of the curve of the adsorption isotherms of chitosan films was smaller and increased at a w values > 0.75. Similar behavior has been reported for films made from chitosan-polyvinyl alcohol, chitosan-FeCl 3 and starch-gelatin (Al-Hassan & Norziah, 2012;Hirase et al, 2010;Sébastien et al, 2006;Srinivasa et al, 2003).…”

Section: Moisture Adsorption Isothermssupporting

confidence: 83%

Modelling the effect of temperature on the water sorption isotherms of chitosan films

2016

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The interaction of the water molecules from the environment with foods and other materials can be evaluated using sorption isotherms. Films and biodegradable films are susceptible to changes in their functional characteristics due to adsorbed water. The amount of moisture that biodegradable films can adsorb depends on the temperature, relative humidity of the storage area and chemical composition. Several mathematical models can be used to describe the behavior of sorption isotherms in biodegradable films and some of them have been modified to include the temperature parameter into the equation. In this research, the original and modified BET, GAB, Halsey, Henderson and Dswin models were assessed to determine their suitability describing the behavior of moisture adsorption isotherms of chitosan films at 15, 20, 25 and 30 °C. The modified models of GAB, Dswin and Halsey gave the best fit to the experimental sorption data of the chitosan films, with R 2 values higher than 0.97 demonstrating that those models describe better the sorption isotherms at the temperatures studied.Keywords: chitosan film; moisture adsorption isotherm; GAB model. Practical Application:The knowledge of the relationship between the equilibrium moisture content, equilibrium relative humidity and temperature is very important in order to describe the effect of water activity on storage of foods. Several mathematical models were used to describe the water sorption behavior of chitosan edible films involving water activity, moisture content and temperature.

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Section: Moisture Adsorption Isothermssupporting

confidence: 83%

Modelling the effect of temperature on the water sorption isotherms of chitosan films

2016

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“…For PVA 4-98 both BET and GAB models, which have previously been applied successfully [47,48] although for different experimental conditions, have shown some inconsistencies in predicting the experimental data. Indeed, for each equilibrium temperature, high RMSE and RMSEa values are observed in Table 4 due to a plateau which appears for water activities above 0.75.…”

Section: Dynamic Vapour Sorption Analysismentioning

confidence: 99%

Thermo-physical characterization of Pharmacoat® 603, Pharmacoat® 615 and Mowiol® 4-98

Perfetti

Alphazan

Wildeboer

et al. 2011

J Therm Anal Calorim

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Hydroxypropyl methylcellulose (HPMC) and polyvinyl alcohol (PVA) are important polymers in pharmaceutical, food and other industries being largely used as encapsulation agents. The characterization of two reference grades of HPMC (Pharmacoat Ò 603 and Pharmacoat Ò 615) and one reference grade of PVA (Mowiol Ò 4-98), through X-ray diffraction (XRD) and thermogravimetry (TG) is described. Specific analyses were performed by means of dynamic vapour sorption analysis of water adsorption/ desorption from vapours at 10, 25, 40, 55 and 70°C. Guggenheim-Anderson-de Boer (GAB), Brunauer-EmmettTeller (BET), Park and n-layer BET models were successfully used to fit the experimental data. The glass transition temperature as function of water content was measured by means of differential scanning calorimetry (DSC). The experimental data were analysed according to Linear, Gordon-Taylor, Fox and Roos equations. XRD

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“…However, a novel food-packaging concept has introduced a new generation of active biodegradable materials. This active packaging will restrict the growth of microorganisms and maintain food safety, even for non-sterile foods [15] and [16]. In a previous study [17] a bioactive thermoplastic film was successfully used to inhibition Penicillium sp, Aspergillus niger and Sclerotinia sclerotiorum growth.…”

Section: Weight Lossmentioning

confidence: 99%

Efficacy of Some Plant Extracts and Biodegradables Wrapping Materials as an Alternative to Fungicides in Increasing Shelf Life Citrus Fruits

Khaleel¹

2017

OJE

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Increasingly global there is an interest to develop a new method by replacing fungicides in packaging fresh fruit by using environment-friendly bio-pesticides, such as use of botanicals or biological control. (Ginger), were tested for their anti-fungal activity for citrus green mold, black and brown rot, compared with the control fungicide (Guazatine). Efficacy of the selected plant extract in cooperated with biodegradable materials wrappers (Polylactic acid, Pectin and Newspaper) was determined during storage at room temperature (±25˚C) to control fruit-pathogen decay under modified atmosphere packaging (MAP) to increase shelf life and improve the fruit quality. Crude extracts from pong-pong and chili showed fungal inhibition zone at 3000 ppm (c.100%), and increased shelf life and decreased weigh loss for fruits wrapped and stored at room temperature compared with untreated fruit.

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Properties and sorption studies of chitosan–polyvinyl alcohol blend films

Cited by 240 publications

References 14 publications

Modelling the effect of temperature on the water sorption isotherms of chitosan films

Modelling the effect of temperature on the water sorption isotherms of chitosan films

Thermo-physical characterization of Pharmacoat® 603, Pharmacoat® 615 and Mowiol® 4-98

Efficacy of Some Plant Extracts and Biodegradables Wrapping Materials as an Alternative to Fungicides in Increasing Shelf Life Citrus Fruits

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