A biorefinery approach for spent coffee grounds valorization using pressurized fluid extraction to produce oil and bioproducts: A systematic review

Araujo, Micheli Nolasco; Santos, Kallynca Carvalho dos; Diniz, Natalia do Carmo; Carvalho, Júlio César de; Corazza, Marcos L.

doi:10.1016/j.biteb.2022.101013

Cited by 11 publications

(6 citation statements)

References 65 publications

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“…Recent reports and reviews on the use of SCG and other coffee processing by-products are available [ 85 ], including applications in the fabrication of construction materials [ 86 ], cosmetics [ 87 ], recovery of bioactive substances [ 88 ], biopolymers and biocatalysts [ 89 , 90 ], food packaging [ 91 ], materials and energy [ 92 ], as well as multiple uses considering a biorefinery approach [ 5 , 93 , 94 , 95 , 96 , 97 , 98 , 99 ]. In the next sections, we will comment on the latest findings on applications of SCG that are of particular interest for the food industry.…”

Section: Applicationsmentioning

confidence: 99%

Potential Uses of Spent Coffee Grounds in the Food Industry

Franca

Oliveira

2022

Foods

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Current estimates place the amount of spent coffee grounds annually generated worldwide in the 6 million ton figure, with the sources of spent coffee grounds being classified as domestic (i.e., household), commercial (i.e., coffee houses, cafeterias and restaurants), and industrial (i.e., soluble and instant coffee industries). The majority of the produced spent coffee grounds are currently being inappropriately destined for landfills or to a form of energy recovery (e.g., incineration) as a refuse-derived fuel. The disposal of spent coffee in landfills allows for its anaerobic degradation with consequent generation and emission of aggressive greenhouse gases such as methane and CO2, and energy recovery processes must be considered an end-of-life stage in the lifecycle of spent coffee grounds, as a way of delaying CO2 emissions and of avoiding emissions of toxic organic volatile compounds generated during combustion of this type of waste. Aside from these environmental issues, an aspect that should be considered is the inappropriate disposal of a product (SCG) that presents unique thermo-mechanical properties and textural characteristics and that is rich in a diversity of classes of compounds, such as polysaccharides, proteins, phenolics, lipids and alkaloids, which could be recovered and used in a diversity of applications, including food-related ones. Therefore, researchers worldwide are invested in studying a variety of possible applications for spent coffee grounds and products thereof, including (but not limited to) biofuels, catalysts, cosmetics, composite materials, feed and food ingredients. Hence, the aim of this essay was to present a comprehensive review of the recent literature on the proposals for utilization of spent coffee grounds in food-related applications, with focus on chemical composition of spent coffee, recovery of bioactive compounds, use as food ingredients and as components in the manufacture of composite materials that can be used in food applications, such as packaging.

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Section: Applicationsmentioning

confidence: 99%

Potential Uses of Spent Coffee Grounds in the Food Industry

Franca

Oliveira

2022

Foods

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“…However, during the process of obtaining oil, a solid residue is generated that could contain substances of interest, such as polyphenols. The extraction of the polyphenol-enriched residue in this hydrophilic step could be of interest in accordance with the circular economy concept [11]. However, there is a lack of information on this cascade valorization process of sweet cherry seeds.…”

Section: Introductionmentioning

confidence: 99%

Valorization of Defatted Cherry Seed Residues from Liquor Processing by Matrix Solid-Phase Dispersion Extraction: A Sustainable Strategy for Production of Phenolic-Rich Extracts with Antioxidant Potential

Rodríguez-Blázquez,

Fernández-Ávila,

Gómez-Mejía

et al. 2023

Antioxidants

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The integrated valorization of food chain waste is one of the most promising alternatives in the transition to a sustainable bioeconomy. Thus, an efficient solid-phase matrix dispersion extraction method, using experimental factorial design and response surface methodology, has been developed and optimized for the recovery of polyphenols from defatted cherry seeds obtained after cherry liquor manufacture and subsequent fatty acid extraction, evaluating the effect of each processing step on the composition and phenolic content of sweet cherry residues. The phenolic extracts before fermentation showed the highest content of total polyphenols (TPC) and flavonoids (TFC) (3 ± 1 mg QE·g−1 and 1.37 ± 0.08 mg GAE·g−1, respectively), while the highest antioxidant capacity was obtained in the defatted seed extracts after both fermentation and distillation. In addition, high-performance liquid chromatography coupled to a quadrupole time-of-flight mass spectrometer (HPLC-ESI-QTOF-MS) was used to determine the phenolic profile. Dihydroxybenzoic acid, neochlorogenic acid, caffeic acid, and quercetin were the main phenolics found, showing differences in concentration between the stages of liquor production. The results underline the prospective of cherry by-products for obtaining phenol-rich bioactive extracts for possible use in different industrial sectors, offering a feasible solution for the cascade valorization of cherry agri-food waste.

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“…Another advantage of the SCG compared to the other wastes is the lack of seasonal behavior. However, due to a large number of widely dispersed collection points, the logistics from households and coffee shops represent a huge challenge [25]. Biodiesel production from the SCGO feedstock has been carried out at the laboratory scale using mainly esterification and transesterification reactions (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, utilizing wastes as feedstock can reduce material costs, generally accounting for up to >70% of the total production cost [35]. Therefore, the main characteristics of the SCG (low costs, non-edible crop, large annual generation) make it a promising biorefinery feedstock [25]. This is a first-of-its-kind report where authors present the technical potential of spent coffee grounds for biodiesel production integrated into the existing biorefinery based on the analyses of the SCGO and unsaponifiable matter present in the SCGO, considering related obstacles within the SCG biodiesel production.…”

Section: Introductionmentioning

confidence: 99%

Integrated Approach to Spent Coffee Grounds Valorization in Biodiesel Biorefinery

Kafková¹,

Kubinec

Mikulec

et al. 2023

Sustainability

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With the increasing consumption of coffee beverages, an increased amount of food waste—spent coffee grounds (SCG)—is generated and disposed into landfills or combusted in incinerators. SCG are characterized as a highly polluting substance with partial toxicity due to the presence of caffeine, tannins, and polyphenols. It also contains 15% of oil on average, and its potential for biodiesel production is thus considerable. The aim of the presented work is to evaluate the possibility and technical potential of biodiesel production from the SCG oil (SCGO) by esterification and transesterification reaction. According to the characterization of the studied SCGO, this stream must be adjusted and purified to be utilized in the existing biodiesel production plant. Fatty acids (FA) represent 85.85% of the SCGO, with two dominant FAs—linoleic and palmitic acids. The necessity of removal and disposal of unsaponifiable matter, which accounts for 15% of the SCGO content, must be highlighted when producing biodiesel from the SCG. The objective of this research was the comparison of different biodiesel production processes, where a two-step transesterification process has been identified as the most successful method for biodiesel production from the SCGO with the highest ester content of 89.62% and the lowest content of unsaponifiable and unidentified matter in the final product. The novelty of the analyses is a characterization of the d unsaponifiable matter present in the SCGO, and the article highlights the importance of progression to be considered when evaluating the technical potential of the SCG biodiesel production integrated into a biorefinery. Nevertheless, the SCG biodiesel can contribute to fulfilling the mandatory share of advanced biofuel in the fuel energy mix given by national legislation and contribution to the circular economy approach of biorefineries.

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A biorefinery approach for spent coffee grounds valorization using pressurized fluid extraction to produce oil and bioproducts: A systematic review

Cited by 11 publications

References 65 publications

Potential Uses of Spent Coffee Grounds in the Food Industry

Potential Uses of Spent Coffee Grounds in the Food Industry

Valorization of Defatted Cherry Seed Residues from Liquor Processing by Matrix Solid-Phase Dispersion Extraction: A Sustainable Strategy for Production of Phenolic-Rich Extracts with Antioxidant Potential

Integrated Approach to Spent Coffee Grounds Valorization in Biodiesel Biorefinery

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