Water sorption and mechanical properties of cassava starch films and their relation to plasticizing effect
TL;DR: In this article, the effects of plasticizers (glycerol, sorbitol, and 1:1 mixture of glycerol and Sorbitol) on moisture sorption characteristics of cassava starch films were investigated at three levels of plasticizer concentration (0, 20, and 40 g/100 g starch).
About: This article is published in Carbohydrate Polymers.The article was published on 2005-05-25. It has received 573 citations till now. The article focuses on the topics: Starch & Plasticizer.
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TL;DR: The use of natural and/or biodegradable plasticizers, with low toxicity and good compatibility with several plastics, resins, rubber and elastomers in substitution of conventional plasticizers attracted the market along with the increasing worldwide trend towards use of biopolymers.
1,417 citations
Cites background from "Water sorption and mechanical prope..."
...Plasticizer concentration and hydrophilic nature were found to be important factors in determining the moisture affinity of cassava starch films [74]....
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...Hydrophilic compounds, such as polyols (GLY and sorbitol) are commonly used in starch films [17,20,33,68, 71,72,74,76,79,82], but some sugars [77,86], surfactants [89,92,93], amino acids and fatty acids [81] could also be employed to improve their mechanical and barrier proper-...
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..., GLY), sorbitol, amongst others on polysaccharide-based films [20,33,36,53,58,71,72,74,77,79,82,89] has been extensively investigated....
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TL;DR: In this article, a review of the thermal processing of starch-based polymers is presented, including both fundamental science such as microstructure, phase transition and rheology, as well as processing techniques, conditions and formulations.
655 citations
TL;DR: Physical and mechanical properties of edible films based on blends of sago starch and fish gelatin plasticized with glycerol or sorbitol (25%, w/w) were investigated in this article.
369 citations
TL;DR: In this article, rosemary extracts were successfully incorporated within cassava starch films in order to produce active food packaging with antioxidant properties, which showed an increase in their antioxidant activity as the polyphenols content increased, while the films containing the greater extract concentration showed better barrier properties against UV light.
343 citations
TL;DR: In this paper, a novel modified starch/carboxy methyl cellulose (CMC) composite films were prepared by a casting method and the effects of CMC addition on the some physical properties of the resulted blend films were investigated.
Abstract: article i nfo Article history: Received 29 March 2009 Accepted 2 June 2010 Novel modified starch/carboxy methyl cellulose (CMC) composite films were prepared by a casting method. The effects of CMC addition on the some physical properties of the resulted blend films were investigated. The blend film composed of 15% W/W CMC /starch, showed the lowest water vapor permeability (WVP) value (2.34×10 −7 g/m . h . Pa).The moisture absorption and solubility in water properties of the blend films exhibited similar trends. The addition of CMC at the level of 20% W/W starch caused an increase in the ultimate tensile strength (UTS) by more than 59% in comparison to the pure starch film without any significant decrease in the strain to break (SB). The measurement of color values showed that by the increasing of the CMC content in polymer matrix, the b values (yellowness), YI and ΔE of the blend films decreased and the L values (Lightness) and WI index increased. Industrial relevance: Ecological concerns have resulted in a renewed interest in natural and compostable materials, and therefore issues such as biodegradability and environmental safety are becoming important. Tailoring new products within a perspective of sustainable development or eco-design, is a philosophy that is applied to more and more materials. It is the reason why material components such as natural fibres, biodegradable polymers can be considered as interesting - environmentally safe - alternatives for the development of new biodegradable composites. Development of biodegradable materials based on starch has become a very attractive option and production of starch based plastic are gradually obtained considerable concern in the world. In this research, improvement of starch film properties is investigated.
324 citations
References
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TL;DR: In this paper, a nonexponential empirical model was proposed to predict moisture contents after long exposure from experimental data obtained in relatively short time, i.e., well before the moisture level appeared to reach a plateau.
Abstract: Published sorption curves in the form of moisture vs time relationships of milk powder and rice, exposed to moist atmosphere or soaked In water, were fitted by a two parameter, nonexponential empirical model. The model enabled prediction of moisture contents after long exposure from experimental data obtained in relatively short time, i.e., well before the moisture level appeared to reach a plateau. The model implied that the moisture equilibrium was somewhat higher than that determined on the assumption that the sample reached a constant weight, but there was no conclusive evidence that this was really the case.
930 citations
"Water sorption and mechanical prope..." refers background or methods in this paper
...Moisture adsorption data were fitted according to a mathematical model suggested by Peleg (1988): MðtÞZM0C ðt=ðk1Ck2tÞÞ, where M(t) is the moisture after time, M0 is the initial moisture content and k1 is the Peleg rate constant (h/(g water/g solids)) and k2 is the Peleg capacity constant (g solids/g water)....
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...Lines are derived from Peleg’s Model (Peleg, 1988)....
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...The Peleg parameters (Peleg, 1988), k1 and k2, are shown in Table 1....
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...To improve the investigation about water sorption behavior, the moisture content data obtained at different times were fitted using Peleg model (Peleg, 1988)....
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TL;DR: In this article, the glycerol ameliore l'extensibilite mais reduit la resistance a la rupture, l'elasticite, les proprietes barriere a la vapeur d'eau.
Abstract: Le glycerol ameliore l'extensibilite mais reduit la resistance a la rupture, l'elasticite, les proprietes barriere a la vapeur d'eau. L'effet plastifiant est tres dependant de la teneur en eau du film. Au cours de la rehydratation du film de gluten on observe une diminution importante de la resistance a la rupture, de l'elasticite et une augmentation de l'extensibilite et de la transmission de vapeur d'eau, pour des temperatures 5, 30 et 50¼C avec respectivement des teneurs en eau de 30 (0,8 aw), 15 (0,7 aw) et 5% (0,4 aw). Ceci peut-etre correlle a la rupture de liaison polymere-eau ainsi qu'au phenomene de transition vitreuse
870 citations
"Water sorption and mechanical prope..." refers background in this paper
...Labuza (1980) attributed this to the fact that the water is associated with the food matrix by different mechanisms in different water activity regions....
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731 citations
Book•
01 Jan 2006
TL;DR: In this paper, the authors describe the properties of foods, including size, shape, volume, and related physical attributes, including Rheological Properties of Food, Thermal Properties of Foods, Electromagnetic Properties, and Water Activity and Sorption Properties of foods.
Abstract: Size, Shape, Volume, and Related Physical Attributes.- Rheological Properties of Foods.- Thermal Properties of Foods.- Electromagnetic Properties.- Water Activity and Sorption Properties of Foods.- Surface Properties of Foods.
642 citations
TL;DR: In this article, the authors determined the water vapor permeability and the mechanical and thermal properties of edible films based on bovine hide and pigskin gelatins using a gravimetric method at 22°C.
560 citations