Subcritical Water: An Innovative Processing Technology

Chakraborty, Snehasis; Shaik, Lubna; Gokhale, Jyoti S.

doi:10.1016/b978-0-08-100596-5.22966-1

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…By the use of subcritical conditions (temperature above boiling point of solvent at standard pressure; high pressure application), the extraction solvent remains in its liquid state but with changed properties including decreased dielectric constant, polarity, viscosity, and surface tension. This enables enhanced solvent penetration inside the extracting material, an improved diffusion rate, and accelerated extraction of targeted compounds [31,[53][54][55]. It is well known that increasing the temperature of subcritical extraction increases the entropy of system enabling better penetration of the solvent into the porous structure of the extracting material and consequently increases the solubility of target compounds [31,54].…”

Section: Multistep Extraction Of Spent Coffee Grounds Oriented Toward...mentioning

confidence: 99%

“…This enables enhanced solvent penetration inside the extracting material, an improved diffusion rate, and accelerated extraction of targeted compounds [31,[53][54][55]. It is well known that increasing the temperature of subcritical extraction increases the entropy of system enabling better penetration of the solvent into the porous structure of the extracting material and consequently increases the solubility of target compounds [31,54]. However, if the compounds of interest are prone to thermal degradation at high temperatures, a compromise between the selected temperature of subcritical extraction and the temperature of thermal degradation of the targeted compound must be made.…”

Section: Multistep Extraction Of Spent Coffee Grounds Oriented Toward...mentioning

confidence: 99%

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Multistep Extraction Transformation of Spent Coffee Grounds to the Cellulose-Based Enzyme Immobilization Carrier

Brekalo,

Rajs,

Aladić

et al. 2023

Sustainability

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The present study investigated the possibility of spent coffee ground (SCG) transformation to a cellulose-based enzyme immobilization carrier using a multistep extraction procedure. In the first step, SCGs were extracted with n-hexane by Soxhlet extraction in order to obtain SCG oil, while the remaining solid residue was subjected to continuous solvent flow sequential subcritical extraction with 96% and 50% ethanol and water. Afterwards, the obtained solid residue was subjected to alkaline liquefaction with 8% NaOH in order to remove lignin and produce cellulose-enriched SCGs as a potential enzyme immobilization carrier. Multistep extraction transformation of SCGs was monitored by chemical analysis of extracts and obtained solid residues. Soxhlet extraction of 100 g of SCGs yielded 10.58 g of SCG oil rich in linoleic and palmitic acid, while continuous solvent flow sequential subcritical extraction of 100 g of defatted SCGs yielded a total of 1.63 g of proteins, 5.58 g of sugars, 204 mg of caffeine, 76 mg of chlorogenic acid, and 11.97 mg of 5-(hydroxymethyl)furfural. Alkaline liquefaction of 100 g of sequentially extracted defatted SCGs by 8% NaOH yielded 7.45 g of proteins, 8.63 g of total polyphenols, 50.73 g of sugars, and 20.83 g of cellulose-enriched SCGs. Based on the characteristics of cellulose-enriched SCGs including a volume-weighted mean particle size of 277 μm, relative narrow particle size distribution with a span value of 1.484, water holding capacity of 7.55 mL/g, and a lack of carrier leakage, it could be safely concluded that produced cellulose-enriched SCGs fulfills criteria to be used as potential enzyme immobilization carrier. Overall, it seems that the proposed multistep extraction transformation of SCGs has great potential to be used for the production of several high-value added products.

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Section: Multistep Extraction Of Spent Coffee Grounds Oriented Toward...mentioning

confidence: 99%

Section: Multistep Extraction Of Spent Coffee Grounds Oriented Toward...mentioning

confidence: 99%

Multistep Extraction Transformation of Spent Coffee Grounds to the Cellulose-Based Enzyme Immobilization Carrier

Brekalo,

Rajs,

Aladić

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…Solute and solvent ratios, protein source, or reactor type are variables that, although they have shown a lower impact on the hydrolysis process, it is important not to leave them aside, because they do have an impact on hydrolysis yields. An example of this is the importance of the solute-to-solvent ratio and the particle size, as the greater the surface exposed to subcritical water, the better the mass flow, which can improve the efficiency of the hydrolysis process [79].…”

Section: Other Variablesmentioning

confidence: 99%

Protein Hydrolysis by Subcritical Water: A New Perspective on Obtaining Bioactive Peptides

et al. 2021

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The importance of bioactive peptides lies in their diverse applications in the pharmaceutical and food industries. In addition, they have been projected as allies in the control and prevention of certain diseases due to their associated antioxidant, antihypertensive, or hypoglycemic activities, just to mention a few. Obtaining these peptides has been performed traditionally by fermentation processes or enzymatic hydrolysis. In recent years, the use of supercritical fluid technology, specifically subcritical water (SW), has been positioned as an efficient and sustainable alternative to obtain peptides from various protein sources. This review presents and discusses updated research reports on the use of subcritical water to obtain bioactive peptides, its hydrolysis mechanism, and the experimental designs used for the study of effects from factors involved in the hydrolysis process. The aim was to promote obtaining peptides by green technology and to clarify perspectives that still need to be explored in the use of subcritical water in protein hydrolysis.

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The study of volatile products formation from the self-degradation of l-ascorbic acid in hot compressed water

et al. 2022

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Subcritical Water: An Innovative Processing Technology

Cited by 5 publications

References 39 publications

Multistep Extraction Transformation of Spent Coffee Grounds to the Cellulose-Based Enzyme Immobilization Carrier

Multistep Extraction Transformation of Spent Coffee Grounds to the Cellulose-Based Enzyme Immobilization Carrier

Protein Hydrolysis by Subcritical Water: A New Perspective on Obtaining Bioactive Peptides

The study of volatile products formation from the self-degradation of l-ascorbic acid in hot compressed water

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