Separation of tea saponin by two-stage foam fractionation

Jin, Yan; Wu, Zhaoliang; Zhao, Yanli; Jiang, Changsuo

doi:10.1016/j.seppur.2011.05.010

Cited by 58 publications

(51 citation statements)

References 29 publications

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“…3 Effects of S type internal on enrichment ratio and recovery percentage of CuO nanoparticles at different CTAB concentrations nanoparticles adsorbed at the gas-liquid interface. The results were consistent with the previous work of Yan et al (2011). For obtaining a high E CuO , 2.6 mm/s was selected as the optimal superficial airflow rate, where E CuO with the S type internal was 71.2 ± 3.6 with a R CuO of 24.5 ± 1.2 %.…”

Section: Effects Of S Type Internal On E Cuo and R Cuo At Different Ssupporting

confidence: 90%

Intensification of the separation of CuO nanoparticles from their highly diluted suspension using a foam flotation column with S type internal

et al. 2015

J Nanopart Res

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Foam flotation is a promising technique for recovering nanoparticles from their highly diluted suspensions. In this work, a novel S type internal was developed to intensify the foam flotation of CuO nanoparticles (357.6 nm in average particle size) from their suspension of 6.2 9 10 -2 mmol/L. By enhancing foam drainage, the S type internal increased the enrichment ratio of CuO nanoparticles by 139.3 ± 12.5 % without significantly affecting their recovery percentage. Under the optimal conditions of Cetyl trimethyl ammonium bromide (CTAB) concentration 0.45 mmol/L, superficial airflow rate 2.6 mm/ s, and volumetric feed rate 1.0 mL/min, the enrichment ratio and recovery percentage of CuO nanoparticles reached 81.6 ± 4.1 and 95.4 ± 4.9 %, respectively, using the foam flotation column with the S type internal. Furthermore, about 95 % CTAB could be recycled by recovering CTAB from the foamate and the residual solution. The recovered CuO nanoparticles were associated with CTAB molecules, so they had better dispersity and dispersion stability than the starting CuO nanoparticles. Therefore, they would have good reusability.

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Section: Effects Of S Type Internal On E Cuo and R Cuo At Different Ssupporting

confidence: 90%

Intensification of the separation of CuO nanoparticles from their highly diluted suspension using a foam flotation column with S type internal

et al. 2015

J Nanopart Res

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“…The foam column method is based on the adsorption of a surfactant at the hydrophobic surface of an air bubble, and presents some advantages for saponin concentration such as simplicity (the system is comprised of a column coupled to an air compressor), low cost and low energy consumption (Backleh-Sohrt et al, 2005;Yan et al, 2011). Initially, in this method, juá and sisal extracts (obtained by simple orbital extraction with two additional re-extractions) were used in an exploratory CCRD.…”

Section: Resultsmentioning

confidence: 99%

“…Backleh-Sohrt et al (2005) utilized a N 2 flow of 15 mL/min, an initial concentration of quillaja saponins between 0.4 and 0.5 g/L, volumes of 70-100 mL and an operation time of 60-100 min. Similarly, Costa (1999) also worked with a N 2 flow of 13.6 mL, whereas Yan et al (2011) used an air flow of 150 mL/min, initial concentration of tea saponins of 3.56 g/L and a volume of 200 mL (with a 3.3 cm internal diameter column). To compare data for different gas flows requires a standardization, based on data about gas temperature and pressure.…”

Section: Resultsmentioning

confidence: 99%

“…The pH was also reported in other works to be important for saponin concentration, due to its effect on net charge, on repulsive forces between molecules and on the CMC. Yan et al (2011) reported that the increase of pH decreased the trends of tea saponins adsorbed on air bubbles, and increased the stability of the formed foam, due to the high viscosity generated by the negative charge of the carboxyl groups of saponins. At pH 2.06, there was a higher β SAP and lower saponin recovery.…”

Section: Resultsmentioning

confidence: 99%

“…Some authors reported the use of this method to concentrate saponins from Quillaja saponaria in a 175 cm high and 2.5 cm internal diameter column with a gas flow rate of 22.60 mL/min through a solution with 80 mg/L of saponins, at pH 3, for 3.5 h, obtaining a concentration factor (β SAP ) of 10 (Costa, 1999). In another work, Yan et al (2011) reported the concentration of tea saponins by a twostep method in a foam column: first, using an air flow rate of 150 mL/min at 65 °C, they obtained a high β SAP (3.47); then increasing the air flow rate to 200 mL/min and decreasing the temperature to 30 °C, they achieved a high saponin recovery (65.2%). Thompson (2004) and Backleh-Sohrt et al (2005) showed that a foam column aided by saponins can be also interesting for the concentration of other molecules such as catechins, faradiol esters, carotenoids and alkaloids.…”

Section: Introductionmentioning

confidence: 99%

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Application of foam column as green technology for concentration of saponins from sisal (Agave sisalana) and Juá (Ziziphus joazeiro)

Ribeiro

Barreto

Coelho

2013

Braz. J. Chem. Eng.

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-Saponins, molecules classified as triterpenic or steroidal glycosides, are metabolites distributed in all the plant kingdom that can be used for the production of foods, cosmetics, and pharmaceuticals, as well as in soil bioremediation. Saponins are normally extracted from natural resources with water, ethanol and/or methanol, and then concentrated by liquid-liquid partitioning with n-butanol. An alternative concentration method is with a foam column, by which the saponins can be concentrated via preferential adsorption at a gasliquid interface. Therefore, the objective of this work was the use of a foam column for the concentration of saponins from juá and sisal, evaluating parameters such as: initial working volume in the column, saponin concentration in the extracts from juá and sisal, air flow rate, pH, Raschig rings loading and operation time. When a gradient air flow rate and 25 g of Raschig rings were used, 82.6% of the jua saponins loaded onto the system were recovered in a 3.46-fold concentrated solution after 9 h of operation. Regarding sisal saponins, a concentration factor of 1.98 was observed with 90.5% of saponin recovery during 4.5 h of operation.

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In situ downstream strategies for cost‐effective bio/surfactant recovery

Najmi

Ebrahimipour

Franzetti

et al. 2018

Biotech and App Biochem

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Since 60-80% of total costs of production are usually associated with downstream collection, separation, and purification processes, it has become advantageous to investigate how to replace traditional methods with efficient and cost-effective alternative techniques for recovery and purification of biosurfactants. In the traditional techniques, large volumes of organic solvents are usually used for increasing production cost and the overall environmental burden. In addition, traditional production and separation methods typically carried out in batch cultures reduce biosurfactant yields due to product inhibition and lower biosurfactants activity as a result of interaction with the organic solvents used. However, some in situ recovery methods that allow continuous separation of bioproducts from culture broth leading to an improvement in yield production and fermentation efficiency. For biosurfactants commercialization, enhancement of product capacity of the separation methods and the rate of product removal is critical. Recently, interest in the integration of separation methods with a production step as rapid and efficient techniques has been increasing. This review focuses on the technology gains and potentials for the most common methods used in in situ product removal: foam fractionation and ultrafiltration, especially used to recover and purify two well-known biosurfactants: glycolipids (rhamnolipids) and lipopeptides (surfactins).

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Separation of tea saponin by two-stage foam fractionation

Cited by 58 publications

References 29 publications

Intensification of the separation of CuO nanoparticles from their highly diluted suspension using a foam flotation column with S type internal

Intensification of the separation of CuO nanoparticles from their highly diluted suspension using a foam flotation column with S type internal

Application of foam column as green technology for concentration of saponins from sisal (Agave sisalana) and Juá (Ziziphus joazeiro)

In situ downstream strategies for cost‐effective bio/surfactant recovery

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