Aqueous food-grade and cosmetic-grade surfactant systems for the continuous countercurrent cloud point extraction

Racheva, Ralena; Rahlf, Anne Feline; Wenzel, Dennis; Müller, C. R.; Kerner, Martin; Luinstra, Gerrit A.; Смирнова, Ирина

doi:10.1016/j.seppur.2018.03.040

Cited by 18 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, a rapid decreased in the volume of the coacervate phase was observed. The CPS is formed by phase separation of nonionic surfactants in an aqueous solution (Racheva et al 2018). Each time in Fig.…”

Section: Discussionmentioning

confidence: 99%

Continuous degradation of phenanthrene in cloud point system by reuse of Sphingomonas polyaromaticivorans cells

et al. 2019

View full text Add to dashboard Cite

Extractive biodegradation of phenanthrene by Sphingomonas polyaromaticivorans was previously carried out in cloud point system (CPS). In this study, we explored the possibility of further increasing the efficiency of the culture by repeatedly reusing cells and the system for biodegradation. Three different recycling strategies were adopted. In reuse of cells plus CPS, cells were reused for 3 times while maintaining high degradation rates (> 90%). Thereafter, the accumulation of metabolites in the dilute phase resulted in a decrease in cell viability. This inhibition was avoided in recycling the cells plus coacervate phase by replacing the dilute phase with fresh Medium. However, due to the slow adaptation of the cells to the new degradation environment and the reduction in the volume of the coacervate phase, the cells were only reused twice and their activity decreased. However, the same long degradation cycle (5 days) as the reuse of cells plus coacervate phase reduced the overall degradation efficiency of phenanthrene. Finally, a combined strategy of 3 times of cells plus CPS reuse and individual cells reuse once was employed and run for two cycles. 3 rounds of reuse of cells plus CPS improved cells utilization and phenanthrene degradation efficiency. Then, the subsequent round of reuse of cells alone relieved the effect of increasing metabolites on cell viability. This study provides a potential application for reusing cells to continuously degrade phenanthrene in soil and water in CPS.Electronic supplementary materialThe online version of this article (10.1186/s13568-019-0736-2) contains supplementary material, which is available to authorized users.

show abstract

Section: Discussionmentioning

confidence: 99%

Continuous degradation of phenanthrene in cloud point system by reuse of Sphingomonas polyaromaticivorans cells

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Since, high temperatures cannot be applied to thermally sensitive compounds like food bioactive vitamins, pigments, polyphenols, tocopherols, antioxidant compounds etc., cloud point extraction which is usually performed at mild or low temperature and do not use harmful and toxic chemicals is most preferred technique. Therefore, this extraction technique recently has been widely used (Racheva et al 2018;Gortzi et al 2008).…”

Section: Principlementioning

confidence: 99%

Novel, energy efficient and green cloud point extraction: technology and applications in food processing

et al. 2019

View full text Add to dashboard Cite

Recently, a novel technique for extraction of functional thermally sensitive bioactive components from food has been developed due to its green efficacy (no toxic chemicals) and cost effectiveness. Cloud point extraction (CPE) is one of the such best alternative techniques that can be used for extraction of wide range of organic and inorganic components using green surfactants. It is a simple, rapid and inexpensive extraction technique which involves clustering of non-ionic surfactant monomers to form a hydrophobic core (micelle), which then entraps the hydrophobic bioactive compounds within it. CPE can be applied for extraction of bioactives from food processing waste as well as separation and purification of proteins. Besides that, research has received special attention on sample preparation for analysis of food constituents in the last decade. The scope of CPE is very vast in these sectors because of the advantages of CPE over other methods. This review deals with significance of CPE method and their potential green applications in food processing.

show abstract

“…CA has a molecular weight of 148.16 g mol −1 and, because of its hydrophobic character, as well as low water solubility (0.23 ± 0.01 g L −1 at 25 °C), it is well-known as a tracer substance for the cloud point extraction. 19,20 The partition coefficients were determined for samples with an overall mass of 14 g (5 wt % ROKAnol NL5, w CA = 0.2 g CA kg solvent −1 , and changing the concentration of additives). As additives, the alcohols 1-hexanol, trans-2-hexen-1-ol, 1-octanol, and 1-hexadecanol were used.…”

Section: Heat Resistance Testmentioning

confidence: 99%

“…With the introduction of ROKAnol NL5, which forms an upper micellar phase (ρ surfactant < ρ water ), Racheva et al 20 avoided the sedimentation of microalgae cells into the micellar phase. Furthermore, ROKAnol NL5 is cosmetic-grade and the extracted microalgae compounds can be used as leave-in products for an application in the cosmetic industry.…”

Section: Introductionmentioning

confidence: 99%

Long-Chain Alcohol-Modified Micellar Systems and Their Application in a Continuous Extraction Process

Fellechner

Rotzolk

Смирнова

2019

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

The integration of an in situ extraction into biocatalytic processes is often limited by the toxicity of organic solvents. Therefore, it is desirable to use water-based extraction systems (for example, aqueous micellar two-phase systems). They can be used, for instance, for the extraction of valuable products from microalgae cultures. Recently, the nonionic surfactant ROKAnol NL5 was identified as a suitable surfactant for this purpose, since it forms an upper micellar phase, enabling an easy separation of whole-cell biocatalysts. However, its application at temperatures below 45 °C is limited by unstable phase boundaries, whereas the maximal temperature to ensure the vitality of the most microalgae cultures is ∼40 °C. To overcome this problem, the addition of long-chain alcohols to the surfactant–water mixture during extraction is suggested in this work. Using 1-hexanol, a continuous extraction process with the model solute trans-cinnamic acid at 40 °C in a stirred column could be realized. The results of a new suggested water/ROKAnol NL5/1-hexanol system at 40 °C (extraction yield, Y cont = 97.67% ± 0.14%; enrichment factor, log10 T CA = 2.42 ± 0.03; number of theoretical stages, N theo = 4.45 ± 0.16) are comparable to those of the water/ROKAnol NL5 system at 45 °C (Y cont = 99.26% ± 0.24%, log10 T CA = 2.60 ± 0.10, N theo = 5.88 ± 0.67), ensuring, however, no damage of microalgae.

show abstract

Aqueous food-grade and cosmetic-grade surfactant systems for the continuous countercurrent cloud point extraction

Cited by 18 publications

References 40 publications

Continuous degradation of phenanthrene in cloud point system by reuse of Sphingomonas polyaromaticivorans cells

Continuous degradation of phenanthrene in cloud point system by reuse of Sphingomonas polyaromaticivorans cells

Novel, energy efficient and green cloud point extraction: technology and applications in food processing

Long-Chain Alcohol-Modified Micellar Systems and Their Application in a Continuous Extraction Process

Contact Info

Product

Resources

About