Selective caffeine removal from green tea using supercritical carbon dioxide extraction

Kim, Wan-Joo; Kim, Jae-Duck; Kim, Jae-Hoon; Oh, Seong Hoon; Lee, Youn-Woo

doi:10.1016/j.jfoodeng.2008.05.018

Cited by 113 publications

(67 citation statements)

References 28 publications

(31 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Solute vapor pressure dominates resulting in increased solubilities at higher pressure and temperature. The behavior known cross-over phenomena which is a result of mutual competition of the solvent density and solute vapor pressure effects in combination has been observed in the case of naphthalene-ethylene (McHugh and Krukonis 1994), phenolics-CO 2 (Murga et al 2002), caffeine-CO 2 (Kim et al 2008) and Resorcinol -CO 2 systems (Reddy and Madras 2011).…”

Section: Solubility Prediction Of Mango Ginger Extract By Eosmentioning

confidence: 97%

Modelling solubility of phenolics of mango ginger extract in supercritical carbon dioxide using equation of state and empirical models

Murthy

Manohar

2014

J Food Sci Technol

View full text Add to dashboard Cite

Solubility of phenolics of mango ginger extract in supercritical carbon dioxide was studied at 40-60°C and 100-350 bar. Critical temperature, critical pressure and critical volume of caffeic acid, the principal component of the extract were calculated using group contribution methods and compared with the values obtained by CHEMDRAW®. Vapor pressure of caffeic acid was predicted by Reidel method. Solubility prediction in supercritical carbon dioxide was studied using two different equation of states (EOS) models and eight empirical models. Peng-Robinson EOS predicted the solubility very well with average deviation of 0.68 % from the experimental solubility. Empirical equations based on the simple error minimization using non-linear regression method which do not require complex physiochemical properties was also found suitable to predict the solubility at different extraction conditions. Jouyban et al. model showed very less deviation (2.25 %) for predicted solubility values from the experiment.

show abstract

Section: Solubility Prediction Of Mango Ginger Extract By Eosmentioning

confidence: 97%

Modelling solubility of phenolics of mango ginger extract in supercritical carbon dioxide using equation of state and empirical models

Murthy

Manohar

2014

J Food Sci Technol

View full text Add to dashboard Cite

show abstract

“…The phenomena may be due to the dominant effect of the increased vapor pressure of the solute at higher temperature, although it leads to decreased solvent density and reduced dissolving power of the solvent (Park et al, 2012;Kim et al, 2008). Total polyphenol, total flavonoid content and antioxidant activity of spent material…”

Section: Solubility Of Caffeine In Supercritical Co 2 +Etohmentioning

confidence: 99%

Mass transfer and kinetic modelling of supercritical CO 2 extraction of fresh tea leaves (Camellia sinensis L.)

Gadkari

Manohar

2017

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Supercritical carbon dioxide extraction was employed to extract solids from fresh tea leaves (Camellia sinensis L.) at various pressures(15 to 35 MPa) and temperatures (313 to 333K) with addition of ethanol as a polarity modifier. The diffusion model and Langmuir model fit well to experimental data and the correlation coefficients were greater than 0.94. Caffeine solubility was determined in supercritical CO 2 and the Gordillo model was employed to correlate the experimental solubility values. The Gordillo model fit well to the experimental values with a correlation coefficient 0.91 and 8.91% average absolute relative deviation. Total phenol content of spent materials varied from 57 to 85.2 mg of gallic acid equivalent per g spent material, total flavonoid content varied from 50.4 to 58.2 mg of rutin equivalent per g spent material and the IC50 value (antioxidant content) varied from 27.20 to 38.11 µg of extract per mL. There was significant reduction in polyphenol, flavonoid and antioxidant content in the extract when supercritical CO 2 extraction was carried out at a higher pressure of 35 MPa.

show abstract

“…SFE was proved to be the best method for decaffeination process, but limitation Tang et al 2011 Catechin by water extraction 80°C for 30 min, a tea particle size of 1 mm, a brewing solution ph <6 and a tea to-water ratio at 50:1 (ml/g) for maximal extraction and tea to-water ratio at 20:1 (ml/g) for cost efficiency along with maximal yield Vuong et al 2011b Total polyphenol 60 % ethanol concentration, solid-to-liquid ratio 1∶ 12 g/ml at 80°C, 10 min under the microwave power of 600 W. of this method is unavoidable loss of tea catechins (Park et al 2007). Still number of patents proves efficiency of this method for decaffeination as the process is user friendly, saves energy consumption and caffeine can be easily separated without processes like heating or evaporation (Kim et al 2007(Kim et al , 2008. When caffeine extraction was tried from tea waste like tea stalk and fiber, this process showed a novel path (Icen and Guru 2009).…”

Section: Supercritical Fluid Extraction (Sfe) From Teamentioning

confidence: 99%

Efficient extraction strategies of tea (Camellia sinensis) biomolecules

Banerjee

Chatterjee

2014

J Food Sci Technol

View full text Add to dashboard Cite

Tea is a popular daily beverage worldwide. Modulation and modifications of its basic components like catechins, alkaloids, proteins and carbohydrate during fermentation or extraction process changes organoleptic, gustatory and medicinal properties of tea. Through these processes increase or decrease in yield of desired components are evident. Considering the varied impacts of parameters in tea production, storage and processes that affect the yield, extraction of tea biomolecules at optimized condition is thought to be challenging. Implementation of technological advancements in green chemistry approaches can minimize the deviation retaining maximum qualitative properties in environment friendly way. Existed extraction processes with optimization parameters of tea have been discussed in this paper including its prospects and limitations. This exhaustive review of various extraction parameters, decaffeination process of tea and large scale cost effective isolation of tea components with aid of modern technology can assist people to choose extraction condition of tea according to necessity.

show abstract

Selective caffeine removal from green tea using supercritical carbon dioxide extraction

Cited by 113 publications

References 28 publications

Modelling solubility of phenolics of mango ginger extract in supercritical carbon dioxide using equation of state and empirical models

Modelling solubility of phenolics of mango ginger extract in supercritical carbon dioxide using equation of state and empirical models

Mass transfer and kinetic modelling of supercritical CO 2 extraction of fresh tea leaves (Camellia sinensis L.)

Efficient extraction strategies of tea (Camellia sinensis) biomolecules

Contact Info

Product

Resources

About