Selective adsorption of tea polyphenols from aqueous solution of the mixture with caffeine on macroporous crosslinked poly(N-vinyl-2-pyrrolidinone)

Zhao, Ruiying; Yu, Yan; Li, Mingxian; Yan, Husheng

doi:10.1016/j.reactfunctpolym.2007.11.016

Cited by 55 publications

(29 citation statements)

References 25 publications

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“…Interestingly it was found that though UAE and MAE shows better polyphenol yield than the conventional one, conventional water assisted extract of carbohydrate from tea flower has more potential in vitro hypoglycemic activity than Macroporous crosslinked Poly(n-vinyl-2-pyrrolidinone) adsorbent with mobile phase ethanol 98 % tea polyphenols and 2 % caffeine recovery by adsorption with 98 mg/gm adsprption capacity Zhao et al 2008 Polyvinylpolypyrrolidone as adsorbent, water elution for caffeine and dimethylsulfoxide/ethanol elution for catechins…”

Section: Extraction Of Polysaccharide From Tea Leaves and Flowersmentioning

confidence: 99%

Efficient extraction strategies of tea (Camellia sinensis) biomolecules

Banerjee

Chatterjee

2014

J Food Sci Technol

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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.

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Section: Extraction Of Polysaccharide From Tea Leaves and Flowersmentioning

confidence: 99%

Efficient extraction strategies of tea (Camellia sinensis) biomolecules

Banerjee

Chatterjee

2014

J Food Sci Technol

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“…Hydrophobic interactions of the adsorbent with CAF persist, and small quantities of CAF tend to remain in the final product. For example, TPh samples still contained about 2% CAF after separation using the weakly polar adsorbent PVP-DEGMA-TAIC, according to studies reported by Yan's group [18].…”

Section: Introductionmentioning

confidence: 71%

“…However, these methods were not suitable for large-scale industrial production due to the low capacity and high production cost associated. In industrial production, tea TPh and CAF were often separated by solvent extraction [11][12][13][14][15][16], metal-ion precipitation [17] and polymeric adsorption [18][19][20][21]. Solvent extraction was a traditional and mature technique, but it was a complex process and suffers from several shortcomings including high cost, a large, toxic solvent consumption and environment pollution.…”

Section: Introductionmentioning

confidence: 99%

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Selective removal of caffeine from tea extracts using macroporous crosslinked polyvinyl alcohol adsorbents

Wang

Kong

et al. 2011

J of Separation Science

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The hydrolysis reaction of ester groups in vinyl acetate (VAc) was used to introduce hydroxyl groups into the matrix of a macroporous adsorbent, which was itself prepared by free radical suspension copolymerization of triallyl isocyanurate (TAIC) and VAc. Therefore, the copolymerization incompatibility between the hydrophilic and the hydrophobic monomer was overcome successfully and the hydrophobic matrix of the polymeric adsorbent containing a polyvinyl alcohol (PVA) segment was obtained. Introduction of the PVA segment decreased the hydrophobic adsorption affinity of the adsorbent while producing the hydrogen-bonding interaction. When isolating the two active components, polyphenols (TPh) and caffeine (CAF), from green tea extracts, this polymeric adsorbent, namely poly(TAIC-co-VA), exhibited good adsorption selectivity towards TPh over CAF. The adsorption mechanism leading to this selectivity involved a hydrophobic interaction mechanism for CAF and multiple weak hydrophobic and hydrogen-bonding interactions for TPh. The adsorption thermodynamics for TPh on poly(TAIC-co-VA) were studied. The effects of adsorbent structure and gradient desorption conditions on isolation were investigated. The result showed that adsorbent, with 20% TAIC content, was able to efficiently remove CAF from different tea extracts with different ratios of TPh and CAF. Finally, almost no CAF was detected in the TPh fraction and the recovery of TPh was greater than 95%.

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“…Few examples of applications to natural products research include recovery and concentration of thiamine from rice bran extract, 8 isolation of alkaloids from Lindelofia achusoides 9 and Aconitum septentrionale, 10 simultaneous determination of phenolics and alkaloids in methanolic extracts of Gentisia species, 11 and selective adsorption of tea polyphenols. 12 Generally, the use of exchange resins as column chromatography material in labor-intensive schemes is a common feature in these reports. Wider applications of SSR in natural products research have yet to appear.…”

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confidence: 99%

Application of Phase-Trafficking Methods to Natural Products Research

Araya¹,

Montenegro²,

Mitscher³

et al. 2011

J. Nat. Prod.

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A novel simultaneous phase-trafficking approach using spatially separated solid-supported reagents (SSR) for rapid separation of neutral, basic, and acidic compounds from organic plant extracts with minimum labor is reported. Acidic and basic ion exchange resins were physically separated into individual sacks ("teabags") for trapping basic and acidic compounds respectively, leaving behind in solution neutral components of the natural mixtures. Trapped compounds were then recovered from solid phase by appropriate suspension in acidic or basic solutions. The feasibility of the proposed separation protocol was demonstrated and optimized with an "artificial mixture" of model compounds. In addition, the utility of this methodology was illustrated with the successful separation of the alkaloid skytanthine from Skytanthus acutus Meyen and the main catechins and caffeine from Camellia sinensis L. (Kuntze). This novel approach offers multiple advantages over traditional extraction methods, as it is not labor intensive, makes use of only small quantities of solvents, produces fractions in adequate quantities for biological assays, and can be easily adapted to field conditions for bioprospecting activities.In 1963, R. B. Merrifield revolutionized peptide synthesis by introducing solid-phase reagents. This brilliantly simple idea allowed the use of reagents in excess and simplified purification, leading to higher yields and fast isolation. 1 Subsequent elaboration using combinatorial techniques have led to peptide compound libraries of thousands of compounds. Since then, an impressive number of inventive modifications have been introduced in a wide range of fields in academia and industrial laboratories. [2][3] Particularly, organic chemists have taken advantage of specific interactions between small organic molecules and solid-supported reagents (SSR) to achieve quick purification of desired nonpeptide products applying creative phase-switching strategies. 4 Furthermore, the isolation process using solid-phase protocols only involves simple operations of filtration and solvent removal that are suitable for automation and high throughput applications and has found particular value in combinatorial chemistry laboratories. 5 Despite the multiple advantages of SSR for isolation of small synthetic organic molecules, this method has yet to find application in resolving natural product extracts. Ion-exchange resins have long been used for purification of particular natural products (i.e. quinine 6-7 ) at a scale only occasionally used in fractionation schemes. Few examples of applications to natural products research These methods require either a substantial investment or lengthy and tedious protocols, preventing their implementation, especially in the remote regions of current bioprospecting interest. Consequently, the need for applications that can generate samples conveniently with suitable quality for initial bioassay is of great current interest. Such a method should not only increase the relative concentration of p...

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Selective adsorption of tea polyphenols from aqueous solution of the mixture with caffeine on macroporous crosslinked poly(N-vinyl-2-pyrrolidinone)

Cited by 55 publications

References 25 publications

Efficient extraction strategies of tea (Camellia sinensis) biomolecules

Efficient extraction strategies of tea (Camellia sinensis) biomolecules

Selective removal of caffeine from tea extracts using macroporous crosslinked polyvinyl alcohol adsorbents

Application of Phase-Trafficking Methods to Natural Products Research

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