acidic hydrolysis antioxidant activity 2 circular economy 2 Ferulic acid 1 Feruloyl esterase 1 Olea europaea 1 PLS regression model 1 PLS-DA 1 Paulownia 1 Penicillium verruculosum 1 Research & information: general 1 Synergy 1 Technology: general issues 1 Xylanase 1 Xylo-oligosaccharides 1 accelerated shelf-life tests 1 aeration 1 alginate/pectin beads 1 alkali pretreatment 1 alkaline extraction 1 alkaline pretreatment 1 anaerobic codigestion 1 anaerobic indicators 1 antioxidants 1 artificial neural networks 1 authentication 1 authenticity 1 autochthonous cultivars 1 barley crop residue 1 biochemical methane potential 1