Optimization of the mechanical properties of biofilm based on alginate - gellan plasticized with glycerol

González-Cuello, Rafael; Mogollon, Omar Fernando Cuadro; Berrio-Guzman, Oscar J.; Cuevas-Martinez, Cristian M.

doi:10.12988/ces.2018.8256

Cited by 3 publications

(5 citation statements)

References 22 publications

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“…It was suggested that the excessive amount of glycerol is responsible for this behavior since it changes the chemical interactions among the polymer, glycerol, and water. This kind of behavior is also highlighted in other studies, confirming that the increase in glycerol content beyond a certain limit can lower the film strength [13,47,58]. In the Ar system, there were slight decreases in the modulus and stress at the break of blends containing 33 and 45% plasticizer in comparison with the neat polymer, and only in the blend with 50% glycerol was a considerable plasticizing effect observed.…”

Section: • Glycerolsupporting

confidence: 82%

A Review of the Effect of Plasticizers on the Physical and Mechanical Properties of Alginate-Based Films

Eslami,

Elkoun,

Robert

et al. 2023

Molecules

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In recent years, there has been a growing attempt to manipulate various properties of biodegradable materials to use them as alternatives to their synthetic plastic counterparts. Alginate is a polysaccharide extracted from seaweed or soil bacteria that is considered one of the most promising materials for numerous applications. However, alginate potential for various applications is relatively limited due to brittleness, poor mechanical properties, scaling-up difficulties, and high water vapor permeability (WVP). Choosing an appropriate plasticizer can alleviate the situation by providing higher flexibility, workability, processability, and in some cases, higher hydrophobicity. This review paper discusses the main results and developments regarding the effects of various plasticizers on the properties of alginate-based films during the last decades. The plasticizers used for plasticizing alginate were classified into different categories, and their behavior under different concentrations and conditions was studied. Moreover, the drawback effects of plasticizers on the mechanical properties and WVP of the films are discussed. Finally, the role of plasticizers in the improved processing of alginate and the lack of knowledge on some aspects of plasticized alginate films is clarified, and accordingly, some recommendations for more classical studies of the plasticized alginate films in the future are offered.

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Section: • Glycerolsupporting

confidence: 82%

A Review of the Effect of Plasticizers on the Physical and Mechanical Properties of Alginate-Based Films

Eslami,

Elkoun,

Robert

et al. 2023

Molecules

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“…The elongation at break values of the sodium alginate concentration biofilms is higher than values obtained in other studies [17]. This leads to the conclusion that the preparation process of the films with sodium alginate-glycerol ratio, dry matter content, composition, handling and drying parameters affects the final properties of the biofilms [9].…”

Section: Response Surface Methodology (Rsm)mentioning

confidence: 68%

“…The authors of. Gonzalez-Cuello et al, 2018 [9] also reported in their study that the TS values obtained in film based on polyhydroxyalkanoates plasticized with different types and concentrations of plasticizers ranged from 31.3 to 15.8 Mpa. These authors also stated that a decrease in TS depends on the concentration and the type of plasticizer used.…”

Section: Tensile Strengthmentioning

confidence: 83%

“…The best optimized combinations would be obtained by using the criteria of maximum tensile strength and elongation at break but minimum thickness. These optimized combinations were then used in the study of edible film properties such as moisture content, water solubility and water vapor permeability Based on Gonzalez-Cuello et al, 2018 [9], the best combinations of variables for selected response functions were obtained by keeping the high value of alginate concentration together with a lower plasticizer concentration could be optimized to reach values up to 134.3845 MPa for the tensile strength of the film. Conversely, by using a lower alginate concentration and a high concentration of the plasticizer could maximize the elongation at the break of the film.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and Characterization Studies of Alginate Biocomposite Film for Potential Use in Food Sensing Application

Arifin

Yet

Rahim

2022

SSP

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This research is about the fabrication and properties study of the alginate bio-composites film for potential use in food sensing applications. A response surface methodology (RSM) was employed to optimize the concentration of sodium alginate (1 to 5% w/v), glycerol (0.4 to 0.8% w/v), and maltodextrin (0.4 to 0.8% w/v) as a function of the tensile strength (TS) and elongation at break (EB) and toughness (T) of the biofilms. The coefficientdetermination (R2) result obtained for TS against alginate, glycerol and maltodextrin is 81.05%, while for EB and T are 32.07% and 64.70% respectively. It showed that the addition of sodium alginate, glycerol and maltodextrin at different concentrations had significantly affected the TS but no effect on EB and T was observed. The optimization study of the film produces two conditions which are conditions 1 and 2. The optimum conditions parameter for condition 1 is a film with 3.0% alginate concentration, 1.0g/g of glycerol content, and 1.50g/g of maltodextrin content while condition 2 was 1.0% of alginate concentration, 1.0g/g of glycerol content and 0.0g/g maltodextrin content. The values of the TS obtained at the optimized condition were 4.75 MPa and 22.99 MPa which is lower than the predicted value of condition 1 (7.0 MPa) or the maximized TS at condition 2 respectively. The thickness value of edible films in this study had an average of 0.54 mm which was higher than the maximum standard thickness of edible films according to the Japanese Industrial Standard (JIS) which is 0.25 mm. Water Vapour Permeability (WVTR) study indicated that all alginate films in this study had a value higher than the JIS 1975 standard of WVTR for edible films which is at a maximum of 10 g/m2/24 hours. The natural colour from Clitoria Ternatea was successfully immobilized into the alginate-based film and the film become dark purple. Based on the result obtained, prediction equations for responses studied are adequate to describe the experimental data on tensile strength, elongation at break, and toughness. However, further modifications are necessary for improvements in mechanical characteristics in the future.

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“…Na indústria alimentar os biofilmes apresentam inúmeras vantagens, podendo ser utilizados na produção de alimentos fermentados, como por exemplo, a produção de vinagre por oxidação biológica do etanol 20 , de ácido cítrico e na produção de sherry 21 . Como exemplo de outros produtos de interesse industrial obtidos usando biofilmes destaca-se a produção de polímeros extracelulares, nomeadamente o alginato e o gelano (polissacáridos de interesse industrial) 22 , e também a produção de vacinas e hormonas 23,24 . Aplicações farmacêuticas através da produção de metabolitos secundários, e processos biológicos para a extração de metais a partir de minério são exemplos de outros bioprocessos onde o uso de microrganismos em biofilmes é relevante 25 .…”

Section: Revista De Ciência Elementarunclassified

Biofilmes em superfícies industriais

et al. 2022

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A sobrevivência dos mais aptos é um princípio biológico aplicável a todos os seres vivos e, embora organismos diferentes tenham desenvolvido mecanismos próprios para maximizar as suas hipóteses de sobrevivência, todos possuem um fator comum -a sobrevivência está diretamente relacionada com a capacidade de adaptação às variações das características do meio ambiente. As bactérias são particularmente adaptáveis a tais variações, em virtude da sua taxa de reprodução extremamente elevada, o que lhes permite a transferência de características de sobrevivência para gerações futuras em períodos de tempo muito curtos. Adicionalmente, muitas espécies bacterianas têm uma tendência natural para se fixar a superfícies, multiplicar e incorporar numa matriz viscosa produzida pelos microrganismos colonizadores, formando biofilmes 1 .Estes biofilmes podem ser encontrados praticamente em qualquer material que esteja em contacto com água, podendo a sua formação ser desejável ou indesejável. De facto, a organização de células microbianas em biofilme, particularmente as bacterianas, é supostamente a primeira forma de vida multicelular existente no planeta, sendo estimado que a maioria das bactérias estejam organizadas em biofilmes 2 . Estas estruturas microbianas podem ocorrer em ambientes extremos, como em fontes hidrotermais, centrais nucleares e tubagens industriais sujeitas a forte desinfeção. Contudo, a existência de biofilmes só foi documentada pela primeira vez em 1943 por Zobell 3 , que observou células microbianas aderidas em paredes de garrafas. Posteriormente, atribuíram o termo filme microbiano ou biológico à camada gelatinosa de células e dos seus subprodutos aderidos às paredes de um biorreator 4 . Topiwala 5 e Hamer 6 observaram camadas de células bacterianas e as suas substâncias poliméricas extracelulares que designaram como crescimento de parede. Characklis 7, 8 publicou uma extensa revisão bibliográfica sobre os fundamentos básicos e as implicações práticas dos biofilmes, utilizando a designação lama microbiana.Em 1984, um consenso dos principais investigadores na área definiu um biofilme como um conjunto de microrganismos, predominantemente bactérias, embebidos numa matriz tridimensional gelatinosa de polímeros extracelulares excretados pelos microrganismos colonizadores 9 . Quando a formação de um biofilme é indesejável, este fenómeno é também CITAÇÃO Simões, L. C. et al.(2022) Biofilmes em superfícies industriais,

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Optimization of the mechanical properties of biofilm based on alginate - gellan plasticized with glycerol

Cited by 3 publications

References 22 publications

A Review of the Effect of Plasticizers on the Physical and Mechanical Properties of Alginate-Based Films

A Review of the Effect of Plasticizers on the Physical and Mechanical Properties of Alginate-Based Films

Fabrication and Characterization Studies of Alginate Biocomposite Film for Potential Use in Food Sensing Application

Biofilmes em superfícies industriais

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