Biofoams with untapped enzymatic potential produced from beer bagasse by indigenous fungal strains.

White rot fungi are promising organisms for the production of mycelial-based biofoams, providing a sustainable means of valorizing lignocellulosic wastes. This study explores the utilization of two indigenous fungal species, isolated from Argentina and belonging to the genera Trametes, for producing biofoams from brewery waste. The resulting biofoams exhibited an average density of 0.

Structural and conformational changes on chitosan after green heterogeneous synthesis of phenyl derivatives.

Four aromatic acid compounds: benzoic acid (Bz), 4-hydroxyphenylpropionic acid (HPPA), gallic acid (GA) and 4-aminobenzoic acid (PABA) were covalently bonded to chitosan in order to improve water solubility at neutral pH. The synthesis was performed via a radical redox reaction in heterogeneous phase by employing ascorbic acid and hydrogen peroxide (AA/HO) as radical initiators in ethanol. The analysis of chemical structure and conformational changes on acetylated chitosan was also the focus of this research.

Coumarin metabolic routes in Aspergillus spp.

Coumarin metabolism by several Aspergillus strains was studied. Aspergillus ochraceus and Aspergillus niger carried out the reduction of the C3-C4 double bond to yield dihydrocoumarin in 24h. Meanwhile, the first strain did not transform dihydrocoumarin after 7d, A.

Atypical regioselective biohydrolysis on steroidal oxiranes by Aspergillus niger whole cells: some stereochemical features.

5,6-Epoxycholestan-3beta-ol derivatives were hydrolyzed in a diastereoconvergent manner by growing and resting cells of several strains of Aspergillus niger, particularly A. niger ATCC 11394. These strains displayed opposite regioselectivity toward each isomer in an alpha and beta epoxide mixture, thus, the nucleophilic attack took place at the less substituted and the most substituted carbon atom on each diasteromer, respectively.