Wet in situ transesterification of spent coffee grounds with supercritical methanol for the production of biodiesel

Son, Jeesung; Kim, Bora; Park, Jeongseok; Yang, Jung‐Seok; Lee, Jae Woo

doi:10.1016/j.biortech.2018.03.067

Cited by 58 publications

(15 citation statements)

References 22 publications

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“…On these bases, numerous authors have suggested different ways to recycle SCG, to manage and reduce its disposal [8][9][10]. SCG can be used as a source of oil for biodiesel production [11][12][13] or as a source of recoverable sugars which can be employed as food addictive or for bioethanol production [13][14][15][16]. Moreover, different papers focused on SCG constituents and their application in the food and nutraceutical industry [1,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Antioxidant and Anti‐Inflammatory Profiles of Spent Coffee Ground Extracts for the Treatment of Neurodegeneration

Angeloni

Freschi

Marrazzo

et al. 2021

Oxidative Medicine and Cellular Longevity

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Spent coffee grounds (SCGs), waste products of coffee beverage production, are rich in organic compounds such as phenols. Different studies have demonstrated phenol beneficial effects in counteracting neurodegenerative diseases. These diseases are associated with oxidative stress and neuroinflammation, which initiates the degeneration of neurons by overactivating microglia. Unfortunately, to date, there are no pharmacological therapies to treat these pathologies. The aim of this study was to evaluate the phenolic content of 4 different SCG extracts and their ability to counteract oxidative stress and neuroinflammation. Caffeine and 5-O-caffeoylquinic acid were the most abundant compounds in all extracts, followed by 3-O-caffeoylquinic acid and 3,5-O-dicaffeoylquinic acid. The four extracts demonstrated a different ability to counteract oxidative stress and neuroinflammation in vitro. In particular, the methanol extract was the most effective in protecting neuron-like SH-SY5Y cells against H2O2-induced oxidative stress by upregulating endogenous antioxidant enzymes such as thioredoxin reductase, heme oxygenase 1, NADPH quinone oxidoreductase, and glutathione reductase. The water extract was the most effective in counteracting lipopolysaccharide-induced neuroinflammation in microglial BV-2 cells by strongly reducing the expression of proinflammatory mediators through the modulation of the TLR4/NF-κB pathway. On these bases, SCG extracts could represent valuable nutraceutical sources for the treatment of neurodegeneration.

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Section: Introductionmentioning

confidence: 99%

Antioxidant and Anti‐Inflammatory Profiles of Spent Coffee Ground Extracts for the Treatment of Neurodegeneration

Angeloni

Freschi

Marrazzo

et al. 2021

Oxidative Medicine and Cellular Longevity

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“…Na reação com adição de água ocorrem 3 reações de forma simultânea, onde os ácidos graxos livres (AGL) reagem com o MA formando ésteres metílicos e ácido acético, os triglicerídeos são hidrolisados para AGL e glicerol, sendo o glicerol acetilado com o ácido acético para a formação de triacetina e água, a presença de AGL proporciona maior reatividade em comparação aos triglicerídeos, facilitando a obtenção de maiores rendimentos em menor tempo de reação (Goembira e Saka, 2014;Son et al, 2018), além disso o ácido acético formado pode atuar como catalisador ácido e acelerar a taxa de reação (Tan et al, 2011).…”

Section: Resultsunclassified

Interesterificação Do Óleo De Crambe Utilizando Metil Acetato Em Meio Pressurizado

Postaue¹,

Trentini²,

Silva³

2018

Blucher Chemical Engineering Proceedings

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Este trabalho investigou a produção de ésteres metílicos a partir do óleo de crambe utilizando metil acetato (MA) em condições pressurizadas. Os experimentos foram conduzidos com o objetivo de avaliar o efeito da temperatura, razão mássica (óleo/MA) e teor de água (em relação à massa de óleo) no rendimento em ésteres para diferentes tempos de residência. O aumento da temperatura favoreceu a obtenção de ésteres nos tempos iniciais de reação (10 e 20 min), sendo que a partir de 30 min houve decréscimo do rendimento. A utilização de maiores quantidades de MA não apresentaram influência na obtenção de ésteres nos tempos iniciais (10 e 20 min) e a partir de 30 min maiores rendimentos foram observados para as condições com razão mássica (óleo/MA) 1:2. A adição de água no meio reacional proporcionou maiores rendimentos de ésteres.

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“…The optimum extraction period avoids excessive power use and reduces the risk of oil damage. Sufficient extraction time is required to break ground coffee cell walls, extract the lipids and achieve an equilibrium [37]. From the results, the optimum ultrasonic oil extraction period using n-hexane was 34 min, significantly lower than the 3 h required by the Soxhlet extraction method for the same solvent.…”

Section: Effect Of Ultrasonic Amplitude and Period On Wcg Lipid Yieldmentioning

confidence: 94%

Resource Recovery from Waste Coffee Grounds Using Ultrasonic-Assisted Technology for Bioenergy Production

et al. 2020

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Biodiesel is a proven alternative fuel that can serve as a substitute for petroleum diesel due to its renewability, non-toxicity, sulphur-free nature and superior lubricity. Waste-based non-edible oils are studied as potential biodiesel feedstocks owing to the focus on the valorisation of waste products. Instead of being treated as municipal waste, waste coffee grounds (WCG) can be utilised for oil extraction, thereby recovering an energy source in the form of biodiesel. This study evaluates oil extraction from WCG using ultrasonic and Soxhlet techniques, followed by biodiesel conversion using an ultrasonic-assisted transesterification process. It was found that n-hexane was the most effective solvent for the oil extraction process and ultrasonic-assisted technology offers a 13.5% higher yield compared to the conventional Soxhlet extraction process. Solid-to-solvent ratio and extraction time of the oil extraction process from the dried waste coffee grounds (DWCG) after the brewing process was optimised using the response surface methodology (RSM). The results showed that predicted yield of 17.75 wt. % of coffee oil can be obtained using 1:30 w/v of the mass ratio of DWCG-ton-hexane and 34 min of extraction time when 32% amplitude was used. The model was verified by the experiment where 17.23 wt. % yield of coffee oil was achieved when the extraction process was carried out under optimal conditions. The infrared absorption spectrum analysis of WCG oil determined suitable functional groups for biodiesel conversion which was further treated using an ultrasonic-assisted transesterification process to successfully convert to biodiesel.Coffee is the world's second-largest traded liquid commodity, after oil, with approximately 8 million tons of coffee produced each year [13]. A large amount of heat energy is used to convert green coffee beans into brown roasted beans in the brewing process, generating large amounts of volatile organic compounds (VOCs) [14]. The enormous demand for this beverage also produces a large quantity of residual waste after brewing. Every 1 ton of coffee beans produces 650 kg of coffee residue after brewing, known as WCG [15]. The global coffee industry produced an estimate of 9.34 million tons of waste in 2017, which was either incinerated, dumped in landfills or composted [16]. Every year Australia produces an estimated 75,000 tonnes of used ground coffee waste, and 93% of cafes send their WCGs to landfill. The annual domestic coffee consumption in Australia has reached almost 1.9 million 60 kg bags. On average, Australians consumed around 1.92 kilograms of coffee per person in 2017 [17]. The grounds that are used to make coffee are used only once and then immediately discarded. With rising rates of consumption, waste residues from the coffee industry (by-products from harvesting, processing, roasting and brewing stages of coffee production and processing) represent a challenge to worldwide directives aiming to reduce landfill volume. The inherent toxicity of several constituents within coffee...

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Wet in situ transesterification of spent coffee grounds with supercritical methanol for the production of biodiesel

Cited by 58 publications

References 22 publications

Antioxidant and Anti‐Inflammatory Profiles of Spent Coffee Ground Extracts for the Treatment of Neurodegeneration

Antioxidant and Anti‐Inflammatory Profiles of Spent Coffee Ground Extracts for the Treatment of Neurodegeneration

Interesterificação Do Óleo De Crambe Utilizando Metil Acetato Em Meio Pressurizado

Resource Recovery from Waste Coffee Grounds Using Ultrasonic-Assisted Technology for Bioenergy Production

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