Depolymerisation of condensed tannins in ethanol as a gateway to biosourced phenolic synthons

文献信息

发布日期 2013-08-23
DOI 10.1039/C3GC41281D
影响因子 10.182
作者

Chahinez Aouf, Eric Dubreucq, Hélène Fulcrand


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摘要

Plant polyphenols are potential sources of substitutes for phenolic petrochemicals, such as bisphenol A. Among them, condensed tannins are the most abundant after lignins in terrestrial plants. They are especially encountered in agro-industrial residues (i.e. fruit marc) and unprocessed biomass (i.e. barks, needles, and leaves). However, this class of biopolymers requires a depolymerisation step prior to their industrial use as fine chemicals. In this work, phenolic synthons were produced by depolymerisation of an industrial grape seed extract of condensed tannins at the multigram scale. The optimization of the depolymerisation reaction through the selection of the most suitable solvent, nucleophilic agent and temperature allowed the reaction to be carried out at mild temperature (40 °C), in two hours, using ethanol as a solvent. The isolation of compounds of interest was performed by precipitation in ethyl acetate followed by a simple adsorption/desorption step on a polyamide cartridge using ethanol as an eluent.

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DOI: 10.1039/C6AN90036D

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Green Chemistry

Green Chemistry
CiteScore: 16.1
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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.

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