Influence of solvent selection and extraction temperature on yield and composition of lipids extracted from spent coffee grounds

Efthymiopoulos, Ioannis; Hellier, Paul; Ladommatos, Nicos; Russo-Profili, Alessandro; Eveleigh, Aaron; Aliev, Abil E.; Kay, Arthur; Mills-Lamptey, Ben

doi:10.1016/j.indcrop.2018.04.008

Cited by 121 publications

(67 citation statements)

References 41 publications

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“…In the case of neutral lipids, an increase in shoot growth increases its amount (Anan, 1983;Salamanca et al, 2017). The amount of total lipids and their fractions, found in this study, is in concordance with the previous reports where boiling or heating at high temperature initially increased the amount of lipids (Efthymiopoulos et al, 2018). Generally, high lipid levels in coffee or tea products indicate better quality of the beverage, i.e.…”

Section: Discussionsupporting

confidence: 91%

Extraction of methyl xanthines and their UHPLC–DAD determination in consumable beverages used in Eastern province of Saudi Arabia

Ahmad

AlOthman

Mohammad

et al. 2019

Biomedical Chromatography

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Coffee and tea are the most widely consumed beverages worldwide. However, the consumer may be unaware of the exact amount of methyl xanthine (MX, i.e. caffeine [C], theobromine [TB] and theophylline [TH]) consumed, as most of the products do not list the proper amounts. This may lead to serious risks including cardiovascular, kidney and stimulant effects. The aim of the study was to determine the MX amount in ready‐to‐use beverages (coffee and tea) collected from various outlets in the city of Al‐Khobar, Saudi Arabia. Forty different samples of espresso, black coffee and red tea were collected. A fast, reliable and efficient UHPLC–DAD method was developed and validated for MX determination. Total lipids were extracted and fractionated in order to determine glycolipids, phospholipids and neutral lipids. The r2 value for the method was 0.980–0.988 in a linearity range of 0.5–200 ppm. The range for MX (C [0.02–2.39 mg/ml], TB [0.00–0.10 mg/ml] and TH [0.00–0.004 mg/ml]) and total lipids was 1–5 g. The amount of glycolipids (3.1 g) was higher among the lipid fractions followed by phospholipids (1.8 g) and neutral lipids (0.25 g). In general, espresso beverages (20–30 ml) contained high amounts of MX whereas black coffee beverages contained high amount of lipids. Most of the beverages expressed C, TB, TH, lipids or their fractions; however, the product with high amounts of MX and lipids at the same time was espresso (brands Chemistry and Wogard). Although the MX and lipid levels in these beverages well below the allowed limits, care must still be taken, especially when using the beverages with high serving volumes (200–250 ml) or coffee prepared via the filter method i.e. black coffee, using a high temperature for a longer time.

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Section: Discussionsupporting

confidence: 91%

Extraction of methyl xanthines and their UHPLC–DAD determination in consumable beverages used in Eastern province of Saudi Arabia

Ahmad

AlOthman

Mohammad

et al. 2019

Biomedical Chromatography

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“…However, the conversion level of vegetable oils to biodiesel is strongly dependent on the quality of the feedstock, with SCG oil showing a significant degree of variation in terms of FFA content with typical values ranging between ∼3% w/w and ∼20% w/w [1,6,12,17,15], although FFA contents as high as 59% have been previously reported [6]. A FFA content above 1-1.5% w/w of the oil inhibits alkaline transesterification by forming stable soap emulsions that impede separation of FAAEs from glycerol [1,6,12].…”

Section: Literature Reviewmentioning

confidence: 99%

Transesterification of high-acidity spent coffee ground oil and subsequent combustion and emissions characteristics in a compression-ignition engine

Efthymiopoulos

Hellier

Ladommatos

et al. 2019

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“…Table 1 presents the solvents and their physical properties and those solvents with dielectric constant below 15 are considered as non-polar. The solvent polarity was used to evaluate solvent efficiency in oil extraction and boiling point, latent heat of vaporization and specific heat values were used to evaluate solvent effect on oil production (Jonson et al, 1983;Efthymiopoulos et al, 2018).…”

Section: Solvents Used and Their Physical Characteristicsmentioning

confidence: 99%

“…The amount of oil and antioxidants extracted from oilseeds depends on the type and polarity of the solvents used (Turkmen et al, 2006). Polar and non-polar aqueous solvents like hexane, acetone, ethanol, methanol and ethyl acetate are used in oil and antioxidants extraction from plant materials (Becker, 1978;Johnson and Lusas, 1983;Efthymiopoulos et al, 2018). Studies on the effect of solvent selection on oil extraction efficiency have been addressed by examining the efficiency of hexane, octane, ethanol, heptane, isopropanol, chloroform, toluene and mixtures of hexane and isopropanol (Al-Hamamre et al, 2012;Caetano et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

The influence of solvents polarity on physicochemical properties and oil yield extracted from pumpkin (Cucurbita maxima) seed

Chatepa¹,

Masamba²

2019

J. Agric. Biotech. Sustain. Dev.

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The effect of solvent polarity, polar and non-polar solvents, on pumpkin (Cucurbita maxima) seed oil yield and quality based on selected physicochemical properties was investigated. Five different solvents, like petroleum ether, hexane, cyclohexane, acetone and ethanol were used on a laboratory scale in this study. Results showed that both physicochemical properties and oil yield extracted from the pumpkin seed were influenced by solvent polarity. Oil yield ranged from 4.12 to 27.93%, with higher yield registered in petroleum ether and lowest in ethanol. Results on the physicochemical properties were as follows: Refractive index ranged from 1.437 (cyclohexane) to 1.466 (hexane), acid value, in mg KOH/g oil, ranged from 1.80 (cyclohexane) to 43.54 (ethanol), Peroxide value ranged, in meq O 2 /kg, from 6.70 (hexane) to 58.11 (ethanol), Iodine value, in g I 2 /g, ranged from 1.20 (petroleum ether) to 36.73 (ethanol), Saponification value, in mg KOH/kg, ranged from 30.54 (hexane) to 121.14 (acetone). The findings have demonstrated that solvent polarity significantly influenced physicochemical properties and oil yield extracted from pumpkin seed and therefore can assist in selecting solvents required in oil extraction to maximize yield and enhance or maintain oil quality.

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Influence of solvent selection and extraction temperature on yield and composition of lipids extracted from spent coffee grounds

Cited by 121 publications

References 41 publications

Extraction of methyl xanthines and their UHPLC–DAD determination in consumable beverages used in Eastern province of Saudi Arabia

Extraction of methyl xanthines and their UHPLC–DAD determination in consumable beverages used in Eastern province of Saudi Arabia

Transesterification of high-acidity spent coffee ground oil and subsequent combustion and emissions characteristics in a compression-ignition engine

The influence of solvents polarity on physicochemical properties and oil yield extracted from pumpkin (Cucurbita maxima) seed

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