Potential and prospects for utilization of avocado by-products in integrated biorefineries

Rodríguez-Martínez, Beatriz; Romaní, Aloia; Eibes, Gemma; Garrote, Gil; Gullón, Beatriz; Río, Pablo G. del

doi:10.1016/j.biortech.2022.128034

Cited by 17 publications

(10 citation statements)

References 78 publications

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“…Partial hydrolysis and degradation of hemicellulose may occur, depending on the properties of the DES. 243,248 Lignin undergoes depolymerization (mainly cleavage of inter-unit ether bonds) and repolymerization pathways similar to those described for the use of ILs. 246,249 Ultimately, the residual content of b-O-4 ′ linkages and the degree of condensation of the isolated lignin depend on the properties of the solvent and the operating temperature.…”

Section: −mentioning

confidence: 97%

“…Cellulose can be dissolved in DESs thanks to the formation of extensive hydrogen bonding between the hydrogen bond acceptor of the DES and the hydroxyl groups in cellulose structure. 243,244,248 Additionally, LCCs can be cleaved during pretreatment with DESs, facilitating the solubilization of hemicellulose and lignin. Partial hydrolysis and degradation of hemicellulose may occur, depending on the properties of the DES.…”

Section: −mentioning

confidence: 99%

“…For instance, one of the most adopted hydrogen bond acceptors, choline chloride, is a common additive used in animal feeds, and urea, a frequently adopted hydrogen bond donor, is used in fertilizers. 243,248 Second, DESs possess a much lower inhibitory effect toward cellulolytic enzymes and fermentative microorganisms, implying that the complete purication of the pulp from the solvent is not necessary aer DES pretreatment. 247,248 One drawback of DESs is their high viscosity, which entails high pumping costs.…”

Section: −mentioning

confidence: 99%

See 2 more Smart Citations

A guide to lignin valorization in biorefineries: traditional, recent, and forthcoming approaches to convert raw lignocellulose into valuable materials and chemicals

Brienza,

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Section: −mentioning

confidence: 97%

Section: −mentioning

confidence: 99%

Section: −mentioning

confidence: 99%

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A guide to lignin valorization in biorefineries: traditional, recent, and forthcoming approaches to convert raw lignocellulose into valuable materials and chemicals

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et al. 2024

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“…Composting seems to be the easier and cheaper alternative for avocado waste management. However, it can be a challenge due to some limitations, including (i) time and space requirements: composting requires time and space to allow the waste to decompose and transform into a usable product; (ii) high moisture content makes it difficult to compost it without the addition of dry organic materials such as straw or wood chips; (iii) improper composting process can result in a product with pathogen microorganisms such as Escherichia coli and Salmonella; and (iv) variability in composition, due to the composition of avocado waste can vary depending on factors such as the variety of avocado, the stage of ripeness, and the method of processing, which can affect the quality and consistency of the compost [70,99,101].…”

Section: Liquid Biofertilizersmentioning

confidence: 99%

Avocado Waste Biorefinery: Towards Sustainable Development

Sandoval-Contreras,

González Chávez,

Poonia

et al. 2023

Recycling

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The increasing demand for avocado consumption has led to a vast generation of waste products. Despite the high nutritional value of avocados, the waste generated from their processing poses a significant environmental challenge. Therefore, the development of a sustainable approach to avocado waste management is a major concern. Biorefinery presents a promising approach to the valorization of avocado waste components, including the seed, peel, and pulp residues. This paper explores the potential of avocado waste biorefinery as a sustainable solution to produce bio-based products. Several approaches, including extraction, hydrolysis, fermentation, and biodegradation, to obtain valuable products such as starch, oil, fiber, and bioactive compounds for food or feed goods have been proposed. The review also highlights the approaches towards addressing challenges of energy security and climate change by utilizing avocado waste as a source to produce biofuels such as biogas, biodiesel, and bioethanol. In conclusion, the development of avocado waste biorefinery presents a promising avenue for sustainable development. This process can efficiently convert the avocado waste components into valuable bio-based products and clean energy sources, contributing to the attainment of a circular economy and a more sustainable future.

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“…In the specific case of avocado, its production, exportation, and consumption have been incremented in recent years [ 7 , 8 ]. One of the main productive countries (Mexico), [ 6 ] reached 2.5 million tons of this fruit in 2021, 35% higher than ten years prior [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Avocado Seed Wastes for Antioxidant Phenolics and Carbohydrates Recovery Using Deep Eutectic Solvents (DES)

Del-Castillo-Llamosas,

Rodríguez-Rebelo,

Rodríguez-Martínez

et al. 2023

Antioxidants

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Avocado seeds represent the chief waste produced in avocado processing, leading not only to environmental problems regarding its elimination but to a loss of economic profitability. In fact, avocado seeds are known as interesting sources of bioactive compounds and carbohydrates, so their utilization may reduce the negative effect produced during the industrial manufacture of avocado-related products. In this sense, deep eutectic solvents (DES) are a novel greener alternative than organic solvents to extract bioactive polyphenols and carbohydrates. The study was based on a Box–Behnken experimental design to study the effect of three factors, temperature (40, 50, 60 °C), time (60, 120, 180 min) and water content (10, 30, 50% v/v) on the responses of total phenolic (TPC) and flavonoid content (TFC), antioxidant capacity (measured as ABTS and FRAP) and xylose content in the extract. The DES Choline chloride:glycerol (1:1) was used as solvent on avocado seed. Under optimal conditions, TPC: 19.71 mg GAE/g, TFC: 33.41 mg RE/g, ABTS: 20.91 mg TE/g, FRAP: 15.59 mg TE/g and xylose: 5.47 g/L were obtained. The tentative identification of eight phenolic compounds was assayed via HPLC-ESI. The carbohydrate content of the solid residue was also evaluated, and that solid was subjected to two different processing (delignification with DES and microwave-assisted autohydrolysis) to increase the glucan susceptibility to enzymes, and was also assayed reaching almost quantitative glucose yields. These results, added to the non-toxic, eco-friendly, and economic nature of DES, demonstrate that these solvents are an efficient alternative to organic solvents to recover phenolics and carbohydrates from food wastes.

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Potential and prospects for utilization of avocado by-products in integrated biorefineries

Cited by 17 publications

References 78 publications

A guide to lignin valorization in biorefineries: traditional, recent, and forthcoming approaches to convert raw lignocellulose into valuable materials and chemicals

A guide to lignin valorization in biorefineries: traditional, recent, and forthcoming approaches to convert raw lignocellulose into valuable materials and chemicals

Avocado Waste Biorefinery: Towards Sustainable Development

Valorization of Avocado Seed Wastes for Antioxidant Phenolics and Carbohydrates Recovery Using Deep Eutectic Solvents (DES)

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