Enhanced extraction of spent coffee grounds oil using high-pressure CO2 plus ethanol solvents

Araujo, Micheli Nolasco; Azevedo, Ana Queren P. L.; Hamerski, Fabiane; Voll, Fernando Augusto Pedersen; Corazza, Marcos L.

doi:10.1016/j.indcrop.2019.111723

Cited by 43 publications

(51 citation statements)

References 48 publications

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“…The extraction equipment utilized in this study has been presented and described in previous studies [33][34][35]. The laboratory-scale extractor setup consists of a highpressure jacketed-vessel, a 62.4 cm 3 stainless steel extraction vessel, with 19 mm diameter and 220 mm bed height, coupled to a heat circulation bath, and a syringe pump (500D ISCO, Lincoln, NE, USA) coupled to a circulation bath set to 10 °C for all extractions performed in this study.…”

Section: Extraction With Compressed Fluidsmentioning

confidence: 99%

Compressed fluids extraction methods, yields, antioxidant activities, total phenolics and flavonoids content for Brazilian Mantiqueira hops

Veiga

Hamerski

Clausen

et al. 2021

The Journal of Supercritical Fluids

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This study compares the yields of different extractions methods for a Brazilian variety of Humulus lupulus using scCO2, scCO2+ethanol, scCO2+ethyl acetate, and compressed propane. Extracts were characterized by total phenolics content (TPC), total flavonoid content (TFC), and antioxidant activity (AA). The extraction yields were from 2.7 to 10.1 wt% when using compressed propane at 20 °C and 10 MPa and scCO2+ethyl acetate at 80 °C and 25 MPa, respectively. Furthermore, the effect of adding ethyl acetate as a cosolvent in a semi-batch process over the extraction time and extracts properties were evaluated in comparison to the extracts obtained using scCO2, scCO2+ethanol, and compressed propane. The results indicate that ethyl acetate increases the extraction yield and produces samples with higher TPC, TFC, and AA values comparing to scCO2+ethanol and similar values compared to pure scCO2.

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Section: Extraction With Compressed Fluidsmentioning

confidence: 99%

Compressed fluids extraction methods, yields, antioxidant activities, total phenolics and flavonoids content for Brazilian Mantiqueira hops

Veiga

Hamerski

Clausen

et al. 2021

The Journal of Supercritical Fluids

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“…Studies have described the extraction of bio-compounds from BSG by conventional solid-liquid extraction processes, such as maceration, infusion, and Soxhlet extraction [9][10][11]. However, alternative extraction methodologies based on compressed fluids have been proposed to efficiently obtain and recovery of different compounds, such as extraction of spent coffee grounds oil using high-pressure CO2 [12], high-pressure extraction of caffeine [13], pressurized hot water extraction of pectin [14], pressurized liquid extraction combined with dispersive liquid-liquid micro extraction of endocrine disrupting compounds from cheese [15], compressed extraction of total phenolics and flavonoids content in hops [16].…”

Section: Introductionmentioning

confidence: 99%

Pressurized liquid extraction of brewer’s spent grain: Kinetics and crude extracts characterization

Herbst

Hamerski

Errico

et al. 2021

Journal of Industrial and Engineering Chemistry

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In this study, extraction yield of valuable compounds from brewer's spent grain (BSG) using pressurized liquid extraction (PLE) was investigated varying temperature, solvent type, and flow rate at a constant pressure. The results were compared with Soxhlet extractions using the total phenolic compounds (TPC), total flavonoid compounds (TFC), antioxidant activity (AA), reducing sugars (RS), and total reducing sugars (TRS) as indices. The highest PLE extraction yield was 20.1 wt%, at 120°C, 2 mL/min using ethanol to water volume ratio of 0.5, at 10 MPa. The TPC, TFC, and AA content were favored by water and water/ethanol extractions and temperature increase. The highest AA was obtained with water at 120 °C and 4 mL/min achieving 9944, 4769 and 4096 µmol TE/100 g of BSG extract, respectively. PLE was capable of present high extraction yields maintaining the RS and TRS in the BSG matrix. In addition, BSG was defatted with compressed propane before the extraction with PLE, showing that 2 compressed propane is highly efficient in recovering the lipid fraction from BSG. The results demonstrated a great potential of water and different EtOH/Water solvent ratio at pressurized conditions for obtaining bio-compounds of BSG in a crude extract with expressive biological activity.

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“…Therefore, these profiles were similar to the fatty acid profiles observed in the present study. Araújo et al [46], Tarigan et al [3] and Passadis et al [17] obtained SCG oil samples with a higher concentration of linoleic acid (44.1-45.43%) and palmitic acid (31.31-33.43%), respectively. The total saturated fatty acid content was 43%, total monounsaturated fatty acid content was 11.1% and the total polyunsaturated fatty acid content was 45.4% [3,17,46].…”

Section: Proximate Composition Of Coffee Silverskin and Spent Coffee Grounds And Characterization Of Respective Oilsmentioning

confidence: 97%

Synthesis of Dietetic Structured Lipids from Spent Coffee Grounds Crude Oil Catalyzed by Commercial Immobilized Lipases and Immobilized Rhizopus oryzae Lipase on Biochar and Hybrid Support

et al. 2020

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The aim of this study was the valorization of coffee industry residues, namely spent coffee grounds (SCG) as a source of oil, and silverskin (CS) as a source of both oil and biomass, under the concept of the circular economy. Therefore, crude oil from SCG was used to produce low-calorie structured lipids (SL) for food and pharmaceutical industries, and CS to produce biochar by pyrolysis for biotechnological uses. SL were obtained by acidolysis with caprylic or capric acid, or interesterification with ethyl caprylate or ethyl caprate, in solvent-free media, catalyzed by immobilized sn-1,3 regioselective lipases. Silverskin biochar (BIO) was directly used as enzyme carrier or to produce hybrid organic-silica (HB) supports for enzyme immobilization. Rhizopus oryzae lipase (ROL) immobilized on Amberlite (AMB), silica (SIL), BIO or HB, and the commercial immobilized Thermomyces lanuginosus (Lipozyme TL IM) and Rhizomucor miehei (Lipozyme RM IM) lipases were tested. Lipozyme RM IM showed better results in SL production than Lipozyme TLIM or ROL on BIO, SIL or HB. About 90% triacylglycerol conversion was attained after 7 h acidolysis or interesterification. Lipozyme RM IM was more stable in interesterification (80% and 65% activity with ethyl caprylate or ethyl caprate) than in acidolysis (first-order decay) after 10 reuses.

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Enhanced extraction of spent coffee grounds oil using high-pressure CO2 plus ethanol solvents

Cited by 43 publications

References 48 publications

Compressed fluids extraction methods, yields, antioxidant activities, total phenolics and flavonoids content for Brazilian Mantiqueira hops

Compressed fluids extraction methods, yields, antioxidant activities, total phenolics and flavonoids content for Brazilian Mantiqueira hops

Pressurized liquid extraction of brewer’s spent grain: Kinetics and crude extracts characterization

Synthesis of Dietetic Structured Lipids from Spent Coffee Grounds Crude Oil Catalyzed by Commercial Immobilized Lipases and Immobilized Rhizopus oryzae Lipase on Biochar and Hybrid Support

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