Subcritical water and supercritical carbon dioxide: efficient and selective eco-compatible solvents for coffee and coffee by-products valorization,Green Chemistry

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Subcritical water and supercritical carbon dioxide: efficient and selective eco-compatible solvents for coffee and coffee by-products valorization
Green Chemistry ( IF 9.3 ) Pub Date : 2020-11-14 , DOI: 10.1039/d0gc03146a
Alexandre Vandeponseele _{1,

2,

3,

4} , Micheline Draye _{1,

2,

3,

4} , Christine Piot _{1,

2,

3,

4} , Gregory Chatel _{1,

2,

3,

4}

Affiliation

This review aims to establish the state of the art of the existing literature on the valorization of coffee and coffee by-products (i.e. green coffee, coffee husk, pulp, silverskin and spent coffee grounds) through the use of pressurized fluids as solvents, including subcritical water (SCW) and supercritical carbon dioxide (SC-CO₂). The first part reviews the exploitation, the composition, the properties and the ways of valorization of coffee beans and their by-products, highlighting their high potential as raw material. The second part is dedicated to subcritical H₂O and supercritical CO₂ applied to coffee and coffee by-products valorization, discussing the involved mechanisms, the parameters’ influence and the superiority of subcritical H₂O and supercritical CO₂ in comparison to other solvents and techniques. Indeed, subcritical H₂O is considered as a super solvent, catalyst and reagent at the same time, being the most efficient technology for carbohydrate and polyphenol recovery as well as biocrude-oil production. Supercritical CO₂ is considered as a chameleon solvent, with unlimited tunability, able to selectively extract high value molecules but also compete with organic solvents in amount and quality of the produced extract. In addition, subcritical H₂O and supercritical CO₂ are complementary solvents, targeting together all the types of molecules in coffee and coffee by-products, leading to the development of a Green Solvent Bio-Refinery (GreSBiR) with sequential uses of subcritical H₂O and supercritical CO₂.

中文翻译：

亚临界水和超临界二氧化碳：用于咖啡和咖啡副产品增值的高效且选择性的生态相容性溶剂

这篇综述旨在通过使用加压流体作为溶剂，建立有关咖啡和咖啡副产品（即生咖啡，咖啡果壳，果肉，银皮和废咖啡渣）的增值的现有文献的最新技术水平。亚临界水（SCW）和超临界二氧化碳（SC-CO ₂）。第一部分回顾了咖啡豆及其副产品的开发，组成，特性和增值方法，突出了它们作为原料的巨大潜力。第二部分致力于亚临界H ₂ O和超临界CO ₂应用于咖啡和咖啡副产品的增值，讨论了与其他溶剂和技术相比所涉及的机理，参数的影响以及亚临界H ₂ O和超临界CO ₂的优越性。实际上，亚临界H ₂ O同时被视为超级溶剂，催化剂和试剂，是碳水化合物和多酚回收以及生物原油生产的最有效技术。超临界CO ₂被认为是变色龙溶剂，具有无限的可调性，能够选择性地提取高价值的分子，但在提取物的数量和质量上也能与有机溶剂竞争。此外，亚临界H ₂ O和超临界CO₂是互补溶剂，将咖啡和咖啡副产品中的所有类型的分子共同作为目标，从而导致了绿色溶剂生物精炼厂（GreSBiR）的开发，其依次使用亚临界H₂ O和超临界CO₂。

更新日期：2020-11-25

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