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Abstract
The aim of this article is to provide an analysis of microwave effects on ferulic and coumaric acids (FA and CA, respectively) extraction from grass biomass (corn stalks and miscanthus). Microwave pretreatment using various solvents was first compared to conventional heating on corn stalks. Then, microwave operational conditions were extended in terms of incident power and treatment duration. Optimal conditions were chosen to increase p-hydroxycinnamic acids release. Finally, these optimal conditions determined on corn stalks were tested on miscanthus stalks to underlie the substrate incidence on p-hydroxycinnamic acids release yields. The optimal conditions—a treatment duration of 405 s under 1000 W—allowed extracting 1.38% FA and 1.97% CA in corn stalks and 0.58% FA and 3.89% CA in miscanthus stalks. The different bioaccessibility of these two molecules can explain the higher or lower yields between corn and miscanthus stalks.
Highlights
Lignocellulosic biomass is a key resource for the sustainable development of the bioeconomy, and its effective implementation would allow a decisive matter and energy co-valorization
The use of lignocellulosic biomass is curtailed because of high processing costs and difficulties related to obtaining high extraction yields
Many applications are being explored from agricultural residues and miscanthus, as they represent an alternative source of many high-value molecules and fibers [2]
Summary
Lignocellulosic biomass is a key resource for the sustainable development of the bioeconomy, and its effective implementation would allow a decisive matter and energy co-valorization. It is available on all continents in different forms and species. P-hydroxycinnamic acids are increasingly attracting the attention of scientists and industry because of their interesting features. Due to their anti-oxidant properties, p-hydroxycinnamic compounds can be used as food preservatives and have a preventive role in some types of cancer [3]. They are covalently bounded to cell walls and difficult to access
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