Environmentally-friendly chemistry

Use Cases 

Confirm the ability of synthesized glycol-surfactant with fluorinated chain to stabilize CO2/Water interface

Reference: Boyère, C.; Favrelle, A.; Léonard, A. F.; Boury, F.; Jérôme, C.; Debuigne, A., Macroporous poly (ionic liquid) and poly (acrylamide) monoliths from CO2-in-water emulsion templates stabilized by sugar-based surfactants. Journal of Materials Chemistry A 2013, 1 (29), 8479-8487.

New environmental laws and regulations imply the development of new process with always fewer toxic solvents. Among them, supercritical CO2 (scCO2) based processes are of great interest because scCO2 is easy to remove by depressurization and it avoids contamination by residual traces of organic solvents. Authors used scCO2 as secondary phase in scCO2 /water emulsion stabilized with glycol-surfactants to make porous polymer materials.

In this study, the surface-active properties of several sugar-based fluorinated surfactants used as emulsifiers were investigated with the automated drop tensiometer. CO2 presents a critical point at 31.1 °C and 73.8 bar. Above these T and P conditions, CO2 forms a supercritical phase with solubility properties that make it hard to use. The TRACKER™ pressure cell allows to reach this critical point with CO2 to provide surface tension measurement even in extreme conditions.

 

TECLIS product: TRACKER™  automatic drop tensiometer equipped with pressure cell 200 °C/200 bar

Key words: Supercritical CO2/Water interface, interfacial tension, pressure

Can sugar-based anionic surfactants be used instead of commercial surfactants ?

 

Reference: Bois, R., Abdellahi, B., Mika, B., Golonu, S., Vigneron, P., Chagnault, V., ... & Nesterenko, A. (2020). Physicochemical, foaming and biological properties of lowly irritant anionic sugar-based surfactants. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 607, 125525.

Surface-active compounds derived from biomass, especially sugar-based amphiphiles, have received wide attention regarding their biodegradability, low toxicity and ecological acceptability.

 

In this paper, three sugar-based anionic surfactant were synthesized and characterized in terms of their interfacial and foaming properties and biological effects. The results show that despite a low adsorption rate, the foaming properties of these molecules, probed with a foam analyzer (FOAMSCAN™ by TECLIS), are comparable to commercial surfactants (SDS). Moreover, low irritant effect is observed with these bio-based surfactants.

TECLIS product: FOAMSCAN™ foam analyzer

Key words: Sugar-based surfactant, foaming properties, Irritation potential

The emulsifying properties of lignin derivatives

 

Reference: Czaikoski, A., Gomes, A., Kaufmann, K. C., Liszbinski, R. B., de Jesus, M. B., & da Cunha, R. L. (2020). Lignin derivatives stabilizing oil-in-water emulsions: Technological aspects, interfacial rheology and cytotoxicity. Industrial Crops and Products, 154, 112762.

The emulsifying properties of lignins, abundant plant-derived materials are probed and compared to those of whey protein isolate (WPI).

Surface tension measurements using an automatic drop tensiometer (TRACKER™  by TECLIS) first showed that lignins can diffuse more rapidly until the vicinity of droplets to adsorb onto the interface of the droplets. Moreover, the dynamic complex dilational modulus was also evaluated using the TRACKER™ . It was found that higher lignin concentration results in more dense packing and hence in a stronger solid-like film around the oil droplets. However, an increase of cytotoxicity in higher lignin doses has been observed.

Finally, lignin emulsions were found to be more stable.

TECLIS product: TRACKER™  automatic drop tensiometer

Key words: Natural emulsifier, In vitro toxicity, Biopolymers, surface tension, interfacial dilational rheology

What are the properties of commercial plant protein emulsifiers?

Reference: da Silva, A. M. M., Almeida, F. S., & Sato, A. C. K. (2021). Functional characterization of commercial plant proteins and their application on stabilization of emulsions. Journal of Food Engineering, 292, 110277.

The use of plant-derived proteins is still limited despite the growing global demand of sustainable options. In this paper, the physicochemical composition and functional properties of three commercial plant protein concentrates: PoPC (potato), RiPC (rice), and PePC (pea) are examined. Surface tension measurements using an automated drop tensiometer (TRACKER™  by TECLIS) showed that the least soluble molecule, RiPC, induces the lowest reduction in surface tension. Moreover, interfacial tension depends on pH for PoPC and RiPC. In addition, the emulsifying property of potato (PoPC) and pea (PePC) proteins was attributed to their activity at the O/A interface and their surface hydrophobicity, while RiPC stabilized emulsions through the presence of insoluble aggregates around the oil droplet which suggest a potential to act as emulsion stabilizing particles . Finally, major differences in functional properties were observed between commercial and laboratory recovered proteins reported in the literature.

TECLIS product: TRACKER™  automatic drop tensiometer

Key words: Natural emulsifier, In vitro toxicity, Biopolymers, surface tension, interfacial dilational rheology