Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight
In the present work we have studied the characteristics of propylene glycol alginates (PGA) adsorption at the air-water interface and the viscoelastic properties of the films in relation to its foaming properties. To evaluate the effect of the degree of PGA esterification and viscosity, different co...
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paper:paper_09277765_v36_n3-4_p139_Baeza2023-06-08T15:52:07Z Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight Baeza, Rosa Isabel Pilosof, Ana María Renata Adsorption Air-water interface Foaming properties Interfacial activity Propylene glycol alginate Surface dilatational properties Adsorption Molecular weight Polypropylenes Viscoelasticity Viscosity Automatic drop tensiometer Foaming properties Propylene glycol alginates (PGA) Solution viscosity Esterification alginic acid adsorption article biofilm esterification foam stability hydrophobicity molecular dynamics molecular weight physical chemistry priority journal temperature sensitivity viscoelasticity viscosity Adsorption Alginates Esterification Molecular Weight Viscosity In the present work we have studied the characteristics of propylene glycol alginates (PGA) adsorption at the air-water interface and the viscoelastic properties of the films in relation to its foaming properties. To evaluate the effect of the degree of PGA esterification and viscosity, different commercial samples were studied - Kelcoloid O (KO), Kelcoloid LVF (KLVF) and Manucol ester (MAN). The temperature (20°C) and pH (7.0) were maintained constant. For time-dependent surface pressure measurements and surface dilatational properties of adsorbed PGA at the air-water interface an automatic drop tensiometer was used. The foam was generated by whipping and then the foam capacity and stability was determined. The results reveal a significant interfacial activity for PGA due to the hydrophobic character of the propylene glycol groups. The kinetics of adsorption at the air-water interface can be monitored by the diffusion and penetration of PGA at the interface. The adsorbed PGA film showed a high viscoelasticity. The surface dilatational modulus depends on the PGA and its concentration in the aqueous phase. Foam capacity of PGA solutions increased in the order KO > MAN > KLVF, which followed the increase in surface pressure and the decrease in the viscosities of PGA solutions. The stability of PGA foams monitored by the drainage rate and collapse time follows the order MAN > KLVF > KO. The foam stability depends on the combined effect of molecular weight/degree of esterification of PGA, solution viscosity and viscoelasticity of the adsorbed PGA film. © 2004 Elsevier B.V. All rights reserved. Fil:Baeza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pilosof, A.M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09277765_v36_n3-4_p139_Baeza http://hdl.handle.net/20.500.12110/paper_09277765_v36_n3-4_p139_Baeza |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Adsorption Air-water interface Foaming properties Interfacial activity Propylene glycol alginate Surface dilatational properties Adsorption Molecular weight Polypropylenes Viscoelasticity Viscosity Automatic drop tensiometer Foaming properties Propylene glycol alginates (PGA) Solution viscosity Esterification alginic acid adsorption article biofilm esterification foam stability hydrophobicity molecular dynamics molecular weight physical chemistry priority journal temperature sensitivity viscoelasticity viscosity Adsorption Alginates Esterification Molecular Weight Viscosity |
| spellingShingle |
Adsorption Air-water interface Foaming properties Interfacial activity Propylene glycol alginate Surface dilatational properties Adsorption Molecular weight Polypropylenes Viscoelasticity Viscosity Automatic drop tensiometer Foaming properties Propylene glycol alginates (PGA) Solution viscosity Esterification alginic acid adsorption article biofilm esterification foam stability hydrophobicity molecular dynamics molecular weight physical chemistry priority journal temperature sensitivity viscoelasticity viscosity Adsorption Alginates Esterification Molecular Weight Viscosity Baeza, Rosa Isabel Pilosof, Ana María Renata Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight |
| topic_facet |
Adsorption Air-water interface Foaming properties Interfacial activity Propylene glycol alginate Surface dilatational properties Adsorption Molecular weight Polypropylenes Viscoelasticity Viscosity Automatic drop tensiometer Foaming properties Propylene glycol alginates (PGA) Solution viscosity Esterification alginic acid adsorption article biofilm esterification foam stability hydrophobicity molecular dynamics molecular weight physical chemistry priority journal temperature sensitivity viscoelasticity viscosity Adsorption Alginates Esterification Molecular Weight Viscosity |
| description |
In the present work we have studied the characteristics of propylene glycol alginates (PGA) adsorption at the air-water interface and the viscoelastic properties of the films in relation to its foaming properties. To evaluate the effect of the degree of PGA esterification and viscosity, different commercial samples were studied - Kelcoloid O (KO), Kelcoloid LVF (KLVF) and Manucol ester (MAN). The temperature (20°C) and pH (7.0) were maintained constant. For time-dependent surface pressure measurements and surface dilatational properties of adsorbed PGA at the air-water interface an automatic drop tensiometer was used. The foam was generated by whipping and then the foam capacity and stability was determined. The results reveal a significant interfacial activity for PGA due to the hydrophobic character of the propylene glycol groups. The kinetics of adsorption at the air-water interface can be monitored by the diffusion and penetration of PGA at the interface. The adsorbed PGA film showed a high viscoelasticity. The surface dilatational modulus depends on the PGA and its concentration in the aqueous phase. Foam capacity of PGA solutions increased in the order KO > MAN > KLVF, which followed the increase in surface pressure and the decrease in the viscosities of PGA solutions. The stability of PGA foams monitored by the drainage rate and collapse time follows the order MAN > KLVF > KO. The foam stability depends on the combined effect of molecular weight/degree of esterification of PGA, solution viscosity and viscoelasticity of the adsorbed PGA film. © 2004 Elsevier B.V. All rights reserved. |
| author |
Baeza, Rosa Isabel Pilosof, Ana María Renata |
| author_facet |
Baeza, Rosa Isabel Pilosof, Ana María Renata |
| author_sort |
Baeza, Rosa Isabel |
| title |
Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight |
| title_short |
Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight |
| title_full |
Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight |
| title_fullStr |
Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight |
| title_full_unstemmed |
Interfacial and foaming properties of prolylenglycol alginates: Effect of degree of esterification and molecular weight |
| title_sort |
interfacial and foaming properties of prolylenglycol alginates: effect of degree of esterification and molecular weight |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09277765_v36_n3-4_p139_Baeza http://hdl.handle.net/20.500.12110/paper_09277765_v36_n3-4_p139_Baeza |
| work_keys_str_mv |
AT baezarosaisabel interfacialandfoamingpropertiesofprolylenglycolalginateseffectofdegreeofesterificationandmolecularweight AT pilosofanamariarenata interfacialandfoamingpropertiesofprolylenglycolalginateseffectofdegreeofesterificationandmolecularweight |
| _version_ |
1768543042891939840 |