scholarly journals Incorporation of bentonite clay in cassava starch films for the reduction of water vapor permeability

2018 ◽  
Vol 105 ◽  
pp. 637-644 ◽  
Author(s):  
M.K.S. Monteiro ◽  
V.R.L. Oliveira ◽  
F.K.G. Santos ◽  
E.L. Barros Neto ◽  
R.H.L. Leite ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Vapor Permeability ◽  
Bentonite Clay ◽  
Cassava Starch ◽  
Vapor Permeability ◽  
Starch Films

scholarly journals Elaboration and Characterization of Active Apple Starch Films Incorporated with Ellagic Acid

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 384
Author(s):  
Juan Tirado-Gallegos ◽  
Paul Zamudio-Flores ◽  
José Ornelas-Paz ◽  
Claudio Rios-Velasco ◽  
Guadalupe Olivas Orozco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Vapor ◽  
Antioxidant Capacity ◽  
Ellagic Acid ◽  
Uv Light ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Starch Films

Apple starch films were obtained from apples harvested at 60, 70, 80 and 90 days after full bloom (DAFB). Mechanical properties and water vapor permeability (WVP) were evaluated. The apple starch films at 70 DAFB presented higher values in the variables of tensile strength (8.12 MPa), elastic modulus (3.10 MPa) and lower values of water vapor permeability (6.77 × 10−11 g m−1 s−1 Pa−1) than apple starch films from apples harvested at 60, 80 and 90 DAFB. Therefore, these films were chosen to continue the study incorporating ellagic acid (EA). The EA was added at three concentrations [0.02% (FILM-EA0.02%), 0.05% (FILM-EA0.05%) and 0.1% (FILM-EA0.1%) w/w] and compared with the apple starch films without EA (FILM-Control). The films were characterized by their physicochemical, optical, morphological and mechanical properties. Their thermal stability and antioxidant capacity were also evaluated. The FILM-Control and FILM-EA0.02% showed a uniform surface, while FILM-EA0.05% and FILM-EA0.1% showed a rough surface and insoluble EA particles. Compared to FILM-Control, EA modified the values of tensile strength, elasticity modulus and elongation at break. The antioxidant capacity increased as EA concentration did. EA incorporation allowed obtaining films with higher antioxidant capacity, capable of blocking UV light with better mechanical properties than film without EA.

Development of Biodegradable Films Based on Durian Seed Starch

2012 ◽  
Vol 506 ◽  
pp. 311-314 ◽  
Author(s):  
W. Pimpa ◽  
C. Pimpa ◽  
P. Junsangsree
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Food Processing ◽  
Corn Starch ◽  
Water Vapor Permeability ◽  
Cassava Starch ◽  
Raw Material ◽  
Vapor Permeability ◽  
Biodegradable Films ◽  
Durian Seed

Fresh durian seed consists largely of starch and can be considered such a suitable raw material for producing biodegradable films. The aim of this work was to develop biodegradable films based on durian seed starch (DSS) and to characterize their water barrier, microscopic and mechanical properties. DSS films were prepared by casting with glycerol as plasticizer. Corn starch and cassava starch, commonly used in food processing, were chosen to prepare films and compare their properties to the DSS-based films. Using a second biopolymer, carboxymethyl cellulose (CMC), in the DSS based composite has been studied as a strategy to improve their important properties. Water vapor permeability and elongation values were improved significantly (p<0.05) when 5% (w/w DSS) CMC was incorporated. Therefore, preparing biodegradable films from DSS is a new alternative for using this raw material which is sometimes much cheaper than commercial starches

Hydrophobicity and Water Vapor Permeability of Ethylene-plasma-coated Whey, Chitosan and Starch Films

2001 ◽  
Vol 49 (2) ◽  
pp. 131-145 ◽  
Author(s):  
M. Lundbäck ◽  
M. S. Hedenqvist ◽  
A. Jansson ◽  
A. Wirsén ◽  
A.-C. Albertsson ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Starch Films

scholarly journals Effect of relative humidities on microstructural, barrier and mechanical properties of Yam starch-monoglyceride films

2009 ◽  
Vol 52 (6) ◽  
pp. 1505-1512 ◽  
Author(s):  
Fábio Avelino Bublitz Ferreira ◽  
Maria Victória Eiras Grossmann ◽  
Suzana Mali ◽  
Fábio Yamashita ◽  
Lisandro Pavie Cardoso
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Screw Extruder ◽  
Relative Crystallinity ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Hydrophobic Compound ◽  
Starch Films

The effect of monoglyceride on microstructural, barrier and mechanical properties of casted yam starch films were investigated in different relative humidities (RH) and compared with glycerol-starch films. A single screw extruder was used to produce the starch - monoglyceride complex before film production and this process was effective to inhibit the phase separation in films. The addition of the hydrophobic compound reduced hydrophobicity, transparency and water vapor permeability of films. This later value for starch-glycerol film (1.7 x 10-10 g Pa-1 s-1 m-1) was higher than starch (1.2 x 10-10 g Pa-1 s-1 m-1) and monoglyceride-starch films (1.0 x 10-10 g Pa-1 s-1 m-1). Films containing glycerol had higher relative crystallinity (B and V H) with a slight increase at higher RH values, while for monoglyceride films, the crystallinity was constant. Monoglyceride-starch films presented poor mechanical properties when compared to glycerol- starch ones but they presented a stable behavior under different relative humidities.

Incorporating Zataria multiflora Boiss. essential oil and sodium bentonite nano-clay open a new perspective to use zein films as bioactive packaging materials

2017 ◽  
Vol 23 (7) ◽  
pp. 582-596 ◽  
Author(s):  
Mahboobeh Kashiri ◽  
Yahya Maghsoudlo ◽  
Morteza khomeiri
Keyword(s):  
Tensile Strength ◽  
Water Vapor ◽  
Essential Oil ◽  
Young’S Modulus ◽  
Vapor Phase ◽  
Water Vapor Permeability ◽  
Bentonite Clay ◽  
Vapor Permeability ◽  
Sodium Bentonite ◽  
Zataria Multiflora

Active zein films with different levels of Zataria multiflora Boiss. essential oil were produced successfully. To enhance properties of this biopolymer for food packaging applications, sodium bentonite clay was used at two levels (2 and 4%). The results indicated that the addition of Z. multiflora Boiss. essential oil caused a reduction in tensile strength and Young’s modulus and slight increase in the percent of elongation at break of the films. Maximum solubility in water and water vapor permeability was observed by incorporation of 10% Z. multiflora Boiss. essential oil in the zein matrix. Transmission electron microscopy micrographs of zein film were verified by the exfoliation of the layers of sodium bentonite clay in the zein matrix. Stronger films with lower water vapor permeability and water solubility were evident of good distribution of sodium bentonite clay in the zein matrix. According to the results, 2% sodium bentonite clay was selected for evaluation of nano active film properties. Water vapor permeability, UV light barrier, tensile strength, and Young’s modulus values of active films were improved by incorporation of 2% sodium bentonite clay. The antibacterial activity of different contents of Z. multiflora Boiss. essential oil in vapor phase demonstrated that use of Z. multiflora Boiss. essential oil in the liquid phase was more effective than in vapor phase. The antibacterial zein-based films showed that active zein film with 5 and 10% Z. multiflora Boiss. essential oil had reductions of 1.68 log and 2.99 log, respectively, against Listeria monocytogenes and 1.39 and 3.07 log against Escherichia coli. Nano active zein film containing 10% Z. multiflora Boiss. essential oil and 2% sodium bentonite clay showed better antibacterial properties against L. monocytogenes (3.23 log) and E. coli (3.17 log).

Effect of Drying Temperature in Biopolymeric Films of Cassava Starch and its Effect on Wettability, Water Vapor Barrier and Mechanical Properties

2018 ◽  
Vol 930 ◽  
pp. 270-275 ◽  
Author(s):  
Victor Rafael Leal Oliveira ◽  
M.K.S. Monteiro ◽  
F.K.G. Santos ◽  
R.H.L. Leite ◽  
E.M.M. Aroucha
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Structural Changes ◽  
High Efficiency ◽  
Low Cost ◽  
Water Vapor Permeability ◽  
Cassava Starch ◽  
Life Extension ◽  
Vapor Permeability ◽  
Drying Time

Coating technologies with biopolymeric films of low cost and high efficiency are effective in maintaining the chemical and sensory characteristics and shelf-life extension of several fruits.Films of cassava starch/glycerol were synthesized at different temperature and time conditions (25oC / 60h, 40oC / 5h, 60oC / 3h and 80oC / 2h) in order to decrease the drying time of the filmogenic solutions.SEM analysis (scanning electron microscopy), WVP (water vapor permeability), wettability and mechanical properties were evaluated in order to identify morphological and structural changes in the polymeric matrix in different conditions.Changes in temperature and drying time significantly reduced the roughness and affected the barrier characteristics, effectively improving tensile strength. A reduction of more than 90% in the drying time was identified.

Hydrophilicity, Solubility and Optical Properties in Composite Films of Gelatin and Bentonite Clay in its Natural Form or Modified

2018 ◽  
Vol 912 ◽  
pp. 136-140 ◽  
Author(s):  
Mayra Keroly Sales Monteiro ◽  
Francisco Klebson Gomes dos Santos ◽  
Ricardo Henrique de Lima Leite ◽  
Edna Maria Mendes Aroucha ◽  
Jussier Oliveira Vitoriano ◽  
...  
Keyword(s):  
Water Vapor ◽  
Ion Exchange ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Bentonite Clay ◽  
Gelatin Film ◽  
Vapor Permeability ◽  
Gelatin Matrix ◽  
Natural Form ◽  
Before And After

Bentonite clay was initially treated with a quaternary ammonium salt to increase its hydrophobicity, and then was dispersed in a gelatin matrix to serve as barrier to water vapor. The clays were characterized by IR spectroscopy in the infrared (FTIR), and X-ray diffraction (XRD), before and after ion exchange. The ion exchange held in the clay provokes on gelatin film a reduction of 65% in the water vapor permeability (WVP); a decrease in solubility of 55%; an increase of 35º in drop contact angle of water on the surface of the film; and 30% of raise in opacity.

Influence of Glycerol Content on the Physic-Chemical and Mechanical Properties of Cassava Starch Films

2020 ◽  
Vol 1012 ◽  
pp. 57-61
Author(s):  
Hortência Nathânia Silva Câmara ◽  
Francisco Leonardo Gomes de Menezes ◽  
Ricardo Henrique de Lima Leite ◽  
Edna Maria Mendes Aroucha ◽  
Francisco Klebson Gomes dos Santos
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Low Cost ◽  
Water Vapor Permeability ◽  
Polymeric Materials ◽  
Cassava Starch ◽  
Vapor Permeability ◽  
Natural Polymer ◽  
Glycerol Content ◽  
Starch Films

The use of natural polymeric materials has been growing notably in order to replace packaging from non-renewable sources. In this sense, cassava starch is a very promising natural polymer for this purpose due to its ease of production, the low cost, besides being biodegradable. However, cassava starch biofilms when dried have a brittle character requiring the addition of a plasticizer. Thus, biofilms were synthesized based on cassava starch (3%) with different percentages of glycerol (5%, 10%, 20%, 40% and 50%) to evaluate changes in physic-chemical and mechanical properties. The results indicate that the increase in percentage of glycerol contributed directly to the increase of water vapor permeability while decreases the contact angle and modulus of elasticity of cassava starch films.

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