Recovery of catechins and proanthocyanidins from winery by-products using subcritical water extraction

García-Marino, Matilde; Rivas-Gonzalo, Julián C.; Ibáñez, Elena; García-Moreno, Concepción

doi:10.1016/j.aca.2005.10.054

Cited by 164 publications

(101 citation statements)

References 24 publications

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“…1), which is close to that of methanol (ε = 33) and ethanol (ε = 24) at 25℃ (Wagner and Pruß, 2002). Therefore, subcritical water has the ability to recover or dissolve both polar and apolar substances from natural products, such as phenolic, polycyclic aromatic compounds and oils (Deng et al, 2004;García-Marino et al, 2006;MoralesMuños et al, 2002). In addition, the dissociation constant of subcritical water for hydrogen and hydroxyl ions is three orders of magnitude higher than that of ambient water as shown in Fig.…”

Section: Introductionmentioning

confidence: 91%

“…gave the relatively highest recovery with the off-odor of oil, whereas lower temperatures provided a higher quality of oil but with very low extraction rates (Eller and Taylor, 2004). García-Marino et al (2006) investigated the recoveries of catechins and proganthocyanidins from winery by-products using subcritical water extraction at 50 to 150℃ for 30 min in comparison to 3 extractions of methanol/water (75/25) for 15 min each at atmospheric pressure. The total polyphenols obtained by subcritical water extraction at 150℃ provided better recoveries of the flavanol dimers and trimers than those by the methanol/water extraction.…”

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confidence: 99%

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Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Wiboonsirikul

Adachi

2008

FSTR

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Water that maintains its liquid state in the temperature range from 100℃ to 374℃ is called subcritical water, compressed hot water or pressurized hot water. This type of water has unique properties compared to ambient water. One is a low relative dielectric constant and another is a high ion product. Due to these properties, this water can be used to extract functional substances from natural resources. In this article, the application of subcritical water for the extraction of substances from agricultural products or their wastes is reviewed.Keywords: subcritical water, agro-waste, extraction, functional substance *To whom correspondence should be addressed. Email: adachi@kais.kyoto-u.ac.jp IntroductionAgricultural products, such as rosemary, grapes, tea leaves, and grain bran, contain bioactive compounds that can function as health-promoting, antioxidative, and radical scavenging substances. Among them, phenolic substances, catechin, epicatechin, anthraquinones, and essential oils are of interest (Deng et al., 2004;Piñeiro et al., 2004;Ibáñez et al., 2003;Shotipruk et al., 2004). Several approaches have recently been used to recover these substances involving their extraction with organic solvents, such as methanol, ethanol and acetone. However, these techniques are timeconsuming and require a large amount of organic solvents, which are harmful to human health and cause environmental stress. Thus, an alternative method that is the effective, economical, environmentally friendly, safe and fast, is required to alleviate these drawbacks. The most common techniques, which have recently been discussed, include supercritical fl uid extraction (e.g., carbon dioxide), pressurized liquid extraction or accelerated solvent extraction, and subcritical water extraction. Of these techniques, subcritical water extraction using water as the extractant is one of the most interesting methods because water is non-fl ammable, non-toxic, cheap, and environmentally safe. The subcritical water, also called pressurized hot water, compressed hot water or superheated water, is hot water that maintains its liquid state at temperatures between 100℃ and 374℃ (the critical temperature and pressure of water are 374℃ and 22.4 MPa, respectively) under pressurized conditions. When the temperature of water increases, its physicochemical properties, in particular its relative dielectric constant and ion product, change. The ion product of water is the product of the concentrations of hydrogen and hydroxyl ions. The relative dielectric constant, ε, or polarity of water can signifi cantly decrease with increasing temperature from approximately 80 at 25℃ to 27 at 250℃ (Fig. 1), which is close to that of methanol (ε = 33) and ethanol (ε = 24) at 25℃ (Wagner and Pruß, 2002). Therefore, subcritical water has the ability to recover or dissolve both polar and apolar substances from natural products, such as phenolic, polycyclic aromatic compounds and oils (Deng et al., 2004;García-Marino et al., 2006; MoralesMuños et al., 2002). In addition, the dissoci...

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Section: Introductionmentioning

confidence: 91%

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confidence: 99%

Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Wiboonsirikul

Adachi

2008

FSTR

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“…During subcritical water extraction, the polarity of water can be altered by fine-tuning the pressure and temperature (Table 1; Amashukeli et al, 2008;Aubrey et al, 2008). The efficacy of subcritical water extraction for isolating organic compounds has been used to extract organic pollutants from environmental solids (Hawthorne et al, 1994), harmful dioxins from soil (Hashimoto et al, 2004) and antioxidants from fruits and vegetables (Garcia-Marino et al, 2006;Singh and Saldaña, 2011).…”

Section: Sub-critical Water Extractionmentioning

confidence: 99%

Extracting organic matter on Mars: A comparison of methods involving subcritical water, surfactant solutions and organic solvents

Luong

Court

Sims

et al. 2014

Planetary and Space Science

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“…Depending on temperature, it can be very effective to selectively extract a variety of polar or non-polar organic compounds from many different matrices. Some practical applications involve the extraction of alkyl benzenes from industrial soil and petroleum waste sludge [1], polychlorinated biphenyls from soil and river sediments [2], therapeutic substances from different plant matrices [3][4][5], natural antioxidants from aromatic plants [6,7], etc. Recent reviews presented numerous applications of subcritical water extraction to recover high added value substances from natural matter [8,9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Predictive Thermodynamic Models for Estimation of Polycyclic Aromatic Solid Solubility in Hot Pressurized Water

Fornari

Ibáñez²,

Reglero³

et al. 2011

TOTHERJ

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Abstract:The ability of two thermodynamic approaches to predict the solubility of solid compounds in hot pressurized water is studied and compared. The Regular Solution Theory, based on the solubility parameter concept, and UNIFACbased models were applied to calculate the solute activity coefficient and then, solubility predictions were compared with experimental data reported in the literature. The analysis was carried out considering polycyclic aromatic hydrocarbons as model substances, i.e. substances which contain only the aromatic AC and ACH groups, and for which reliable pure physical properties such as melting point, fusion enthalpy and molar volume are available in the literature. The solubility values predicted with the UNIFAC-based models were considerably better than those obtained with the solubility parameter approach. Particularly, the modified Dortmund UNIFAC model presented an appropriate functionality of solubility with temperature, and the extension of this model to other type of aromatic compounds also provided a satisfactory prediction of solubility data.

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Recovery of catechins and proanthocyanidins from winery by-products using subcritical water extraction

Cited by 164 publications

References 24 publications

Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Extracting organic matter on Mars: A comparison of methods involving subcritical water, surfactant solutions and organic solvents

Analysis of Predictive Thermodynamic Models for Estimation of Polycyclic Aromatic Solid Solubility in Hot Pressurized Water

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