Mass deacidification of papers and books: V. Fungistatic properties of papers treated with aminoalkylalkoxysilanes

Abstract

International audienceA new process using aminoalkylalkoxysilanes (AAAS) was developed recently for paper and book mass deacidification. This process is entirely novel in that, besides deacidifying, it also improves the mechanical properties of paper. In the present article, the properties of inhibition of fungal growth of the treated papers are investigated. It was found that the AAAS tested acted as surface-active antifungal agents when introduced in the paper, significantly reducing the growth of Aspergillus niger and Paecilomyces variotii, two fungal species commonly found in storage areas of libraries and archives. The AAAS which seemed the most efficient in preventing the fungal development was 3-aminopropylmethyldi-methoxysilane (AMDES), functionalised with a primary amine. The effect was significant in the different papers tested which demonstrated the protection against the proliferation of filamentous fungi in vitro for papers treated with AMDES. The higher concentration of AMDES inside the paper proved to be the most effective. The highest efficiency was reached for AAAS uptakes around 6%. At this concentration the sporulation of the two strains was inhibited and the development of A. niger mycelia was highly reduced

Immobilization and orientation‐dependent activity of a naturally occurring antimicrobial peptide

“…After exposure to E. coli for 4 h, the SMAP_c‐funtionalized planar glass substrate demonstrated a mixture of live (Figure , left) and dead (Figure , right), which was equivalent to ~2‐log reduction. Silane has been shown to possess antimicrobial properties ; therefore, as a control, APTES deposited on the glass slide was also evaluated for activity. This surface was taken through the entire SMAP immobilization protocol, absent the addition of SM(PEG 12 ) or SMAP_c.…”

Microbiological Analysis of Surfaces of Leonardo Da Vinci’sAtlantic Codex: Biodeterioration Risk

“…These species together with Eurotium repens and E. amstelodami can also be harmful to humans, for their ability to cause pulmonary invasive aspergillosis, cutaneous infections, keratitis, and allergic reactions [ 24 , 35 , 36 ]. Paecilomyces variotii is a fungal species commonly found in storage areas of libraries and archives [ 37 ]. Penicillium chrysogenum and Alternaria alternata are known as paper biodeteriogens [ 23 ] and Penicillium expansum was found capable of degrading straw-cellulose [ 38 ].…”

Strengthening of degraded cellulosic material using a diamine alkylalkoxysilane

“…The novel solvent phase process solution based on aminoalkylalkoxysilanes (AAASs) targeted for libraries and archive materials provides, besides deacidification and alkaline reserve deposition, a clear improvement in the mechanical properties of the paper, enhances the stability toward aging, and confers fungistatic properties to the paper. [3][4][5]14 The understanding of the chemical and physicochemical events occurring between cellulose macromolecules and AAAS is essential in the interpretation of their effect as strengthening agents for cellulosic materials and in enabling the design of treatment molecules specifically adapted to papers in different alteration (oxidation) states. In our previous work, aminopropylmethyldiethoxysilane (AMDES), which has been thoroughly characterized, 6,15 was chosen due to its capability to polycondensate as a linear polymer upon hydrolysis.…”